Android小项目——简易备忘录
16lz
2021-12-17
Android小项目——简易备忘录的实现
简易备忘录主要实现功能类似手机默认备忘录，可以对备忘录目录进行增添和删除。在编辑页面，可以显示当前时间，编辑备忘录标题，备忘录内容，设置时间提醒，插入图片等
文章目录
-
- Android小项目——简易备忘录的实现
- 前言
- 一、主界面UI及功能
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- 主要功能介绍
- 主界面的xml代码
- 主界面的java代码
- 二、新建备忘录页面
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- 主要功能介绍
- xml代码
- java代码
- 三、编辑已保存备忘录页面
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- 主要功能介绍
- xml代码
- JAVA代码
- 四、数据存储
- 五、实体类——Memo
- 总结
前言
简易备忘录主要实现功能类似手机默认备忘录，可以对备忘录目录进行增添和删除。在编辑页面，可以显示当前时间，编辑备忘录标题，备忘录内容，设置时间提醒，插入图片等
一、主界面UI及功能
主要功能介绍
- 单击加号图标可以新建一个备忘录并跳转到编辑页面
- 单击备忘录列表中的子项，可以进入已保存备忘录页面对备忘录内容进行修改
- 长按备忘录列表中的子项，可以对该条备忘录进行选择性删除
主界面的xml代码
主界面的java代码
package test_5;import androidx.appcompat.app.AppCompatActivity;import androidx.recyclerview.widget.LinearLayoutManager;import androidx.recyclerview.widget.RecyclerView;import android.app.AlertDialog;import android.content.ContentResolver;import android.content.ContentUris;import android.content.ContentValues;import android.content.DialogInterface;import android.content.Intent;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.net.Uri;import android.os.Bundle;import android.provider.CalendarContract;import android.provider.SyncStateContract;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;import com.example.test.R;import org.litepal.crud.DataSupport;import org.litepal.exceptions.DataSupportException;import org.litepal.tablemanager.Connector;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import butterknife.BindView;import butterknife.ButterKnife;import butterknife.OnClick;import static com.example.test.R.id.img_add;public class MainActivity extends AppCompatActivity { private ArrayList <Integer> memoId = new ArrayList<>(); private List<Memo> mMemoList; @BindView(R.id.img_add) ImageView mAddImage; @BindView(R.id.memo_list) RecyclerView mDataList; private static final String TAG = "MainActivity"; private MemoAdapter mMemoDataAdapter; private String mTitle; private String mBody; private String mCreateTime; private String mValues; private String mModifyTime; private String mIsTipsChecked; //设置点击事件，点击图片跳转至编辑页面 @OnClick({ R.id.img_add}) public void onClicked() { Intent intent = new Intent(MainActivity.this, EditActivity.class); startActivity(intent); } //点击item，编辑已有内容的备忘录 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main_activity); ButterKnife.bind(this); initView(); initData(); initEvent(); } //初始化数据 private void initData() { //获取数据库里的内容 mMemoList = new ArrayList<>(); mMemoList = DataSupport.findAll(Memo.class); for (Memo memo: mMemoList) { Memo mMemo = new Memo(); int id = memo.getId(); mMemo.setId(id); memoId.add(id); mMemo.setTitle(memo.getTitle()); mMemo.setText(memo.getText()); mMemo.setCreateTime(memo.getCreateTime()); mMemo.setTipsChecked(memo.isTipsChecked()); } mMemoDataAdapter.setData(mMemoList); } private void initEvent() { //点击图标跳转到编辑页面 mAddImage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this, EditActivity.class); startActivity(intent); } }); //点击item跳转到编辑页面 mMemoDataAdapter.setOnItemClickLinstener(new MemoAdapter.OnItemClickLinstener() { @Override public void onClick(int position, String title, String body, boolean tipsChecked) { Toast.makeText(MainActivity.this, "clicked..." + position, Toast.LENGTH_SHORT).show(); Intent intent = new Intent(MainActivity.this, AmendActivity.class); //将数据显示在AmendActivity中 Bundle bundle = new Bundle(); bundle.putInt(Constants.MEMO_ID, position + 1); bundle.putString(Constants.MEMO_TITLE, title); bundle.putString(Constants.MEMO_BODY, body); bundle.putBoolean(Constants.MEMO_NEED_TIPS, tipsChecked); intent.putExtras(bundle); startActivity(intent); } }); //长按item删除 mMemoDataAdapter.setOnItemLongClickLinstener(new MemoAdapter.OnItemLongClickListener() { @Override public void onLongClick(int position, String title, String body) { Toast.makeText(MainActivity.this, "long click", Toast.LENGTH_SHORT).show(); //提示dialog Memo mMemo = new Memo(); mMemo.setTitle(title); mMemo.setText(body); Integer currentId = memoId.get(position); mMemo.setId(currentId); showDialog(position, mMemo); } }); }// 提示dialog是否删除该记录 private void showDialog(final int position, final Memo record) { AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this); dialog.setTitle("提示："); dialog.setMessage("是否删除当前记录(添加的提醒事件将会同时被删除)"); dialog.setPositiveButton("删除", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //删除数据库中的记录 doDelete(position, record); } }); dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //停留在当前页面 Toast.makeText(MainActivity.this, "已取消删除", Toast.LENGTH_SHORT).show(); } }); dialog.show(); } //删除数据库中的记录 // 同时删除提醒事件 public void doDelete(int position, Memo record) { int currentMemoId = record.getId(); Log.d(TAG, "currente memo id is " + currentMemoId); Log.d(TAG, "currente memo position is " + position); //memo.db删除数据 DataSupport.deleteAll(Memo.class, "id = ?", "currentMemoId"); //列表中删除该记录 mMemoDataAdapter.removeItem(position); //判断是否删除提醒事件 boolean tipsChecked = record.isTipsChecked(); Log.d(TAG, "tipsChecked" + tipsChecked); if (tipsChecked) { //删除提醒事件 //可以获取到备忘录的title和body String deleteTitle = record.getTitle(); //根据title和body查询calendar中的id queryPosition(deleteTitle); } //更新数据/ui mDataList.post(new Runnable() { @Override public void run() { mMemoDataAdapter.notifyDataSetChanged(); } }); } private void queryPosition(String deleteTitle) { //遍历calendar的数据库来找到对应memo的id //查询事件 ContentResolver contentResolver = getContentResolver(); Uri uri = Uri.parse("content://com.android.calendar/events"); Cursor cursor = contentResolver.query(uri, new String[]{ CalendarContract.Events._ID}, CalendarContract.Events.TITLE + "=" + deleteTitle, null, null, null); String[] columnNames = cursor.getColumnNames(); while (cursor.moveToNext()) { for (String columnName : columnNames) { mValues = cursor.getString(cursor.getColumnIndex(columnName)); Log.d(TAG, columnName + "==" + mValues); } } long deleteEventId = Integer.parseInt(mValues); Log.d(TAG, "deleteEventId is " + deleteEventId); cursor.close(); //根据ID删除calendar表中的数据 if (deleteEventId != 0) { Uri deleteEventUri = ContentUris.withAppendedId(Uri.parse("content://com.android.calendar/events"), deleteEventId); getContentResolver().delete(deleteEventUri, null, null); } } //初始化控件 private void initView() { //数据列表 mDataList = findViewById(R.id.memo_list); //recyclerview的基本设置 LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, RecyclerView.VERTICAL, false); linearLayoutManager.setStackFromEnd(true); linearLayoutManager.setReverseLayout(true); mDataList.setLayoutManager(linearLayoutManager); mMemoDataAdapter = new MemoAdapter(); mDataList.setAdapter(mMemoDataAdapter); //创建数据库 Connector.getDatabase(); }}二、新建备忘录页面
主要功能介绍
- 单击返回图标可以返回主界面
- 在标题输入框可以输入备忘录标题
- 在内容输入区域可以输入备忘录内容
- 点击图片图标可以进行图片插入（此功能目前有bug,点击即程序闪退）
- 点击“是否设置提醒”的checkbox,则可以设置备忘录提醒的日期和时间
- 点击保存按钮即可对备忘录内容进行保存，并跳转到主界面
- 点击清空按钮即可清空备忘录内容
页面布局：
xml代码
代码如下（示例）：
<?xml version="1.0" encoding="utf-8"?> java代码
package test_5;import androidx.annotation.NonNull;import androidx.annotation.RequiresApi;import androidx.appcompat.app.AppCompatActivity;import android.Manifest;import android.app.AlertDialog;import android.app.DatePickerDialog;import android.app.TimePickerDialog;import android.content.ContentResolver;import android.content.ContentValues;import android.content.DialogInterface;import android.content.Intent;import android.content.pm.PackageManager;import android.database.Cursor;import android.net.Uri;import android.os.Build;import android.os.Bundle;import android.provider.CalendarContract;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.DatePicker;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.TimePicker;import android.widget.Toast;import com.bumptech.glide.Glide;import com.example.test.R;import org.litepal.tablemanager.Connector;import java.util.Calendar;import java.util.Date;import java.util.List;import java.util.TimeZone;import butterknife.BindView;import butterknife.ButterKnife;import static test_5.MyTimeFormat.getTimeStr;import static test_5.MyTimeFormat.myDateFormat;public class EditActivity extends AppCompatActivity implements ImagePickerConfig.OnImageSelectedFinishLisenter { @BindView(R.id.btn_back) ImageView mBackBtn; @BindView(R.id.content) EditText mContextEv; @BindView(R.id.btn_save) Button mSaveBtn; @BindView(R.id.btn_clean) Button mCleanBtn; @BindView(R.id.edit) EditText mMomeTitle; @BindView(R.id.edit_time) TextView mEditTime; @BindView(R.id.memo_is_time) CheckBox mIsTip; @BindView(R.id.check_data) TextView mTipsDate; @BindView(R.id.check_time) TextView mTipsTime; @BindView(R.id.insert_image_btn) View mInsertImageBtn; @BindView(R.id.image_picker_one) ImageView mImageViewOne; @BindView(R.id.image_picker_two) ImageView mImageViewTwo; @BindView(R.id.image_picker_three) ImageView mImageViewThree; private static final String TAG = "EditActivity"; private static final int PREMISSION_REQUEST_CODE = 1; private static final int MAX_SELECTED_COUNT = 3; private Integer year; private Integer month; private Integer dayOfMonth; private Integer hour; private Integer minute; private DatePickerDialog dialogDate; private TimePickerDialog dialogTime; private String mCreateDate; private String mDispCreateDate; private int mYear; private int mMonth; private int mDay; private Calendar mCalendar; private int mHour; private int mMinute; private int mSecond; private boolean mTipIsChecked; //动态获取权限时的请求码 private static final int PERMISSION_REQUEST_CODE = 1; private long mEventId; private int mMyHourOfDay; private int mMyMinute; private int mMyDayOfMonth; private int mMyYear; private int mMyMonth; private String mTitle; private String mBody; public int mSelectedSize; private ImagePickerConfig mPickerConfig; @RequiresApi(api = Build.VERSION_CODES.M) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.edit_activity); ButterKnife.bind(this); checkCalendarPermission(); checkImagePermission(); getDate(); initCalendar(); initView(); initEvent(); initPickerConfig(); } private void initPickerConfig() { mPickerConfig = ImagePickerConfig.getInstance(); mPickerConfig.setMaxSelectedCount(MAX_SELECTED_COUNT); mPickerConfig.setOnImageSelectedFinishLisenter(this); } //检查是否有读写相册权限 @RequiresApi(api = Build.VERSION_CODES.M) private void checkImagePermission() { int readExStroagePresmission = checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE); Log.d(TAG, "readExStroagePresmission" + readExStroagePresmission); if (readExStroagePresmission == PackageManager.PERMISSION_GRANTED) { //有权限 } else { //没有权限，需要去申请权限 requestPermissions(new String[]{ Manifest.permission.READ_EXTERNAL_STORAGE}, PREMISSION_REQUEST_CODE); } } //查询日历，验证URL @RequiresApi(api = Build.VERSION_CODES.M) private void queryCalender() { ContentResolver contentResolver = getContentResolver(); Uri uri = CalendarContract.Calendars.CONTENT_URI; if (checkSelfPermission(Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) { return; } Cursor query = contentResolver.query(uri, null, null, null, null); String[] columnNames = query.getColumnNames(); for (String columnName : columnNames) { Log.d(TAG, "columnName -- > " + columnName); } query.close(); } //创建日历用户 private void initCalendar() { TimeZone timeZone = TimeZone.getDefault(); ContentValues value = new ContentValues(); value.put(CalendarContract.Calendars.NAME, "yy"); value.put(CalendarContract.Calendars.ACCOUNT_NAME, "mygmailaddress@gmail.com"); value.put(CalendarContract.Calendars.ACCOUNT_TYPE, "com.android.exchange"); value.put(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME, "mytt"); value.put(CalendarContract.Calendars.VISIBLE, 1); value.put(CalendarContract.Calendars.CALENDAR_COLOR, -9206951); value.put(CalendarContract.Calendars.CALENDAR_ACCESS_LEVEL, CalendarContract.Calendars.CAL_ACCESS_OWNER); value.put(CalendarContract.Calendars.SYNC_EVENTS, 1); value.put(CalendarContract.Calendars.CALENDAR_TIME_ZONE, timeZone.getID()); value.put(CalendarContract.Calendars.OWNER_ACCOUNT, "mygmailaddress@gmail.com"); value.put(CalendarContract.Calendars.CAN_ORGANIZER_RESPOND, 0); Uri calendarUri = CalendarContract.Calendars.CONTENT_URI; calendarUri = calendarUri.buildUpon() .appendQueryParameter(CalendarContract.CALLER_IS_SYNCADAPTER, "true").appendQueryParameter(CalendarContract.Calendars.ACCOUNT_NAME, "mygmailaddress@gmail.com").appendQueryParameter(CalendarContract.Calendars.ACCOUNT_TYPE, "com.android.exchange").build(); getContentResolver().insert(calendarUri, value); } //检查是否获取日历的读写权限 @RequiresApi(api = Build.VERSION_CODES.M) private void checkCalendarPermission() { int writePermission = checkSelfPermission(Manifest.permission.WRITE_CALENDAR); int readPermission = checkSelfPermission(Manifest.permission.READ_CALENDAR); if (writePermission == PackageManager.PERMISSION_GRANTED && readPermission == PackageManager.PERMISSION_GRANTED) { //有读写日历的权限 Log.d(TAG, "has permission..."); } else { //没有权限 //需要获取权限 Log.d(TAG, "no permission..."); requestPermissions(new String[]{ Manifest.permission.READ_CALENDAR, Manifest.permission.WRITE_CALENDAR}, PERMISSION_REQUEST_CODE); } } //判断请求码结果来决定是否能成功获取权限 @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (requestCode == PERMISSION_REQUEST_CODE) { //权限检查的结果 if (grantResults.length == 3 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[2] == PackageManager.PERMISSION_GRANTED) { //此时有权限 Toast.makeText(this, "有权限", Toast.LENGTH_SHORT).show(); } else { //此时没有权限 //可以给出一个提示： //用户点击确定后重新调用请求权限 //用户点击取消后就不再获取权限了 finish(); Toast.makeText(this, "没有权限", Toast.LENGTH_SHORT).show(); } } } //获取当前时间 private void getDate() { mCalendar = Calendar.getInstance(); mYear = mCalendar.get(Calendar.YEAR); mMonth = mCalendar.get(Calendar.MONTH); mDay = mCalendar.get(Calendar.DAY_OF_MONTH); mHour = mCalendar.get(java.util.Calendar.HOUR_OF_DAY); mMinute = mCalendar.get(java.util.Calendar.MINUTE); mSecond = mCalendar.get(java.util.Calendar.SECOND); } //点击事件 private void initEvent() { //返回 mBackBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //获取输入内容 String title = mMomeTitle.getText().toString().trim(); String body = mContextEv.getText().toString().trim(); if (!title.equals("") && !body.equals("")) { //如果标题，内容都不为空，则显示dialog showDialog(title, body); } else { //如果都为空则返回 startIntent(); } } }); //保存 mSaveBtn.setOnClickListener(new View.OnClickListener() { @RequiresApi(api = Build.VERSION_CODES.M) @Override public void onClick(View v) { //获取输入内容 mTitle = mMomeTitle.getText().toString().trim(); mBody = mContextEv.getText().toString().trim(); Log.d(TAG, "title is " + mTitle); Log.d(TAG, "body is " + mBody); if (canDoSave(mTitle, mBody)) { saveInToDb(mTitle, mBody); if (mTipIsChecked) { Toast.makeText(EditActivity.this, "保存成功", Toast.LENGTH_SHORT).show(); setTipIntoCalendar(); startIntent(); } else { startIntent(); } } } }); mCleanBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mContextEv.setText(" "); } }); //是否设置提醒事件,checkbox是否被选中 mIsTip.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { mTipIsChecked = isChecked; Log.d(TAG, "mChecked" + isChecked); if (isChecked) { //选择设置提醒的话就选择时间 mTipsDate.setVisibility(View.VISIBLE); } else { //无法设置提醒 mTipsDate.setVisibility(View.GONE); mTipsTime.setVisibility(View.GONE); } } }); //选择事件日期 mTipsDate.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(EditActivity.this, "1111", Toast.LENGTH_SHORT).show(); //选择事件时间 showDatePickerDialog(); //设置time为可见 mTipsTime.setVisibility(View.VISIBLE); } }); //选择提醒时间 mTipsTime.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //选择时间 showTimePickerDialog(); } }); //插入图片被点击了，跳转到picker界面 mInsertImageBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(EditActivity.this, PickerActivity.class)); } });} //设置提醒时间 private void showTimePickerDialog() { TimePickerDialog.OnTimeSetListener listener = new TimePickerDialog.OnTimeSetListener() { @Override public void onTimeSet(TimePicker view, int hourOfDay, int minute) { //记录下当前选择的时间，设置到提醒事件中去 mMyHourOfDay = hourOfDay; mMyMinute = minute; mTipsTime.setText(hourOfDay + ":" + minute); } }; TimePickerDialog dialog = new TimePickerDialog(this, 0, listener, mHour, mMinute, true); dialog.show(); } //设置事件日期 private void showDatePickerDialog() { DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener() { @Override public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) { //显示设置的会见 //记录下当前所选的日子，设置到提醒事件中去 mMyYear = year; mMyMonth = ++month; mMyDayOfMonth = dayOfMonth; mTipsDate.setText(year + "-" + mMyMonth + "-" + dayOfMonth); } }; DatePickerDialog datePickerDialog = new DatePickerDialog(this, 0, listener, mYear, mMonth, mDay); datePickerDialog.show(); } //将内容保存到数据库 private void saveInToDb(String title, String body) { Memo mMemo = new Memo(); mMemo.setTitle(title); mMemo.setText(body); mMemo.setCreateTime(mDispCreateDate); mMemo.setTipsChecked(mTipIsChecked); mMemo.save(); } //向日历中插入提醒事件 @RequiresApi(api = Build.VERSION_CODES.M) private void setTipIntoCalendar() { //插入事件 //前面查询出来的 long calID = 1; //时间创建 java.util.Calendar beginTime = java.util.Calendar.getInstance(); //Month value is 0-based. e.g., 0 for January. //开始时间 int month = mMyMonth - 1; beginTime.set(mMyYear, month, mMyDayOfMonth, mMyHourOfDay, mMyMinute); long startMillis = beginTime.getTimeInMillis(); java.util.Calendar endTime = java.util.Calendar.getInstance(); //结束时间 endTime.set(mMyYear, month, mMyDayOfMonth, mMyHourOfDay, mMyMinute + 45); long endMillis = endTime.getTimeInMillis(); Log.d(TAG, "beginTime -- > " + mMyYear + "-" + month + "-" + mMyDayOfMonth + "-" + mMyHourOfDay + "-" + mMyMinute); Log.d(TAG, "endTime -- > " + mMyYear + "-" + month + "-" + mMyDayOfMonth + "-" + mMyHourOfDay + "-" + mMyMinute + 45); //准备好插入事件数据库的内容 ContentResolver cr = getContentResolver(); ContentValues values = new ContentValues(); //开始时间 values.put(CalendarContract.Events.DTSTART, startMillis); //结束时间 values.put(CalendarContract.Events.DTEND, endMillis); //标题 values.put(CalendarContract.Events.TITLE, mTitle); //描述 values.put(CalendarContract.Events.DESCRIPTION, mBody); //日历ID values.put(CalendarContract.Events.CALENDAR_ID, calID); //时间时区 String timeZone = TimeZone.getDefault().getID(); Log.d(TAG, "time zone -- > " + timeZone); values.put(CalendarContract.Events.EVENT_TIMEZONE, timeZone); if (checkSelfPermission(Manifest.permission.WRITE_CALENDAR) != PackageManager.PERMISSION_GRANTED) { return; } Uri uri = cr.insert(CalendarContract.Events.CONTENT_URI, values); Log.d(TAG, "insert result --- > " + uri); //插入提醒 //获取当前插入事件的ID String strUri = String.valueOf(uri); String currentId = strUri.replace("content://com.android.calendar/events/", ""); mEventId = Integer.valueOf(currentId); ContentValues remindValues = new ContentValues(); //15分钟前进行提醒 remindValues.put(CalendarContract.Reminders.MINUTES, 15); remindValues.put(CalendarContract.Reminders.EVENT_ID, mEventId); remindValues.put(CalendarContract.Reminders.METHOD, CalendarContract.Reminders.METHOD_ALERT); Uri reminduri = cr.insert(CalendarContract.Reminders.CONTENT_URI, remindValues); Log.d(TAG, "result uri -- > " + reminduri); } //判断能否保存 private boolean canDoSave(String title, String body) { //用于判断能否进行保存动作 //true:此时说明可以保存内容,保存内容至数据库中 //flase:不能保存，需要写内容 boolean flag = true; if (title.equals("")) { Toast.makeText(this, "标题不能为空", Toast.LENGTH_SHORT).show(); flag = false; } if (title.length() > 10) { Toast.makeText(this, "标题过长", Toast.LENGTH_SHORT).show(); flag = false; } if (body.length() > 200) { Toast.makeText(this, "内容过长", Toast.LENGTH_SHORT).show(); flag = false; } if (body.equals("")) { Toast.makeText(this, "内容不能为空", Toast.LENGTH_SHORT).show(); flag = false; } if (mTipIsChecked) { //如果选中“添加提醒事件”,就需要将日期时间填写完整才可以 if (mTipsDate.getText().toString().equals("请选择日期") || mTipsTime.getText().toString().equals("请选择时间")) { Toast.makeText(this, "日期/时间不能为空", Toast.LENGTH_SHORT).show(); flag = false; } } return flag; } //显示dialog private void showDialog(final String title, final String body) { AlertDialog.Builder dialog = new AlertDialog.Builder(EditActivity.this); dialog.setTitle("提示："); dialog.setMessage("是否保存当前内容"); dialog.setPositiveButton("保存", new DialogInterface.OnClickListener() { @RequiresApi(api = Build.VERSION_CODES.M) @Override public void onClick(DialogInterface dialog, int which) { Log.d(TAG, "保存"); //将数据保存至数据库，设置提醒事件 if (canDoSave(title, body)) { saveInToDb(title, body); if (mTipIsChecked) { setTipIntoCalendar(); startIntent(); } else { startIntent(); } } } }); dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //停留在当前页面 Log.d(TAG, "取消"); } }); dialog.show(); } //页面跳转 private void startIntent() { Intent intent = new Intent(EditActivity.this, MainActivity.class); startActivity(intent); } //初始化操作 private void initView() { //初始化当前时间 Date date = new Date(System.currentTimeMillis()); //创建的时间，存入数据库，数据库根据时间先后显示列表 mCreateDate = myDateFormat(date, DateFormat.NORMAL_TIME); mDispCreateDate = getTimeStr(date); if (mEditTime.getText().length() != 0) { mEditTime.setText(mDispCreateDate); } dialogDate = null; dialogTime = null; hour = 0; minute = 0; year = 0; month = 0; dayOfMonth = 0; //初始化数据库 Connector.getDatabase(); } @Override public void onSelectedFinish(List<ImageItem> selectedResult) { //所选择的图片列表在该处回来了 for (ImageItem imageItem : selectedResult) { Log.d(TAG, "image item is " + imageItem); } mSelectedSize = selectedResult.size(); Log.d(TAG, "selected size is " + mSelectedSize); mPickerConfig.setSelectResult(selectedResult); mPickerConfig.setSeletcedSize(mSelectedSize); setPics(selectedResult); } private void setPics(List<ImageItem> selectedResult) { switch (mSelectedSize) { case 1: Glide.with(mImageViewOne.getContext()).load(selectedResult.get(0).getPath()).into(mImageViewOne); mImageViewOne.setVisibility(View.VISIBLE); mImageViewTwo.setVisibility(View.GONE); mImageViewThree.setVisibility(View.GONE); break; case 2: Glide.with(mImageViewOne.getContext()).load(selectedResult.get(0).getPath()).into(mImageViewOne); Glide.with(mImageViewTwo.getContext()).load(selectedResult.get(1).getPath()).into(mImageViewTwo); mImageViewOne.setVisibility(View.VISIBLE); mImageViewTwo.setVisibility(View.VISIBLE); mImageViewThree.setVisibility(View.GONE); break; case 3: Glide.with(mImageViewOne.getContext()).load(selectedResult.get(0).getPath()).into(mImageViewOne); Glide.with(mImageViewTwo.getContext()).load(selectedResult.get(1).getPath()).into(mImageViewTwo); Glide.with(mImageViewThree.getContext()).load(selectedResult.get(2).getPath()).into(mImageViewThree); mImageViewOne.setVisibility(View.VISIBLE); mImageViewTwo.setVisibility(View.VISIBLE); mImageViewThree.setVisibility(View.VISIBLE); break; } }}三、编辑已保存备忘录页面
主要功能介绍
与编辑页面功能一致
xml代码
<?xml version="1.0" encoding="utf-8"?> JAVA代码
package test_5;import androidx.annotation.NonNull;import androidx.annotation.RequiresApi;import androidx.appcompat.app.AlertDialog;import androidx.appcompat.app.AppCompatActivity;import android.Manifest;import android.app.DatePickerDialog;import android.app.TimePickerDialog;import android.app.slice.Slice;import android.content.ContentResolver;import android.content.ContentValues;import android.content.DialogInterface;import android.content.Intent;import android.content.IntentFilter;import android.content.pm.PackageManager;import android.content.pm.ProviderInfo;import android.database.Cursor;import android.graphics.ColorSpace;import android.net.Uri;import android.os.Build;import android.os.Bundle;import android.provider.CalendarContract;import android.provider.SyncStateContract;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.DatePicker;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.TimePicker;import android.widget.Toast;import com.bumptech.glide.Glide;import com.example.test.R;import org.litepal.crud.DataSupport;import org.litepal.tablemanager.Connector;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.List;import butterknife.BindView;import butterknife.ButterKnife;import static test_5.MyTimeFormat.getTimeStr;public class AmendActivity extends AppCompatActivity implements ImagePickerConfig.OnImageSelectedFinishLisenter{ @BindView(R.id.amend_btn_back) ImageView mBackBtn; @BindView(R.id.amend_edit_time) TextView mCurrentTime; @BindView(R.id.amend_edit) EditText mTitle; @BindView(R.id.amend_content) EditText mContent; @BindView(R.id.amend_memo_is_time) CheckBox mCheckBox; @BindView(R.id.amend_check_data) TextView mDataPicker; @BindView(R.id.amend_check_time) TextView mTimePicker; @BindView(R.id.amend_btn_save) Button mSaveBtn; @BindView(R.id.amend_btn_clean) Button mCleanBtn; @BindView(R.id.amend_insert_image_btn) View mInsertImage; @BindView(R.id.amend_pic_one) ImageView mPicOne; @BindView(R.id.amend_pic_two) ImageView mPicTwo; @BindView(R.id.amend_pic_three) ImageView mPicThree; private static final int PERMISSION_REQUEST_CODE = 2; private static final int MAX_SELECTED_COUNT = 3; private static final int PREMISSION_REQUEST_CODE = 1; private Calendar mCalendar; private int mMinute; private int mHour; private int mDay; private int mMonth; private int mSecond; private int mYear; private DatePickerDialog dialogDate; private TimePickerDialog dialogTime; private Integer year; private Integer month; private Integer dayOfMonth; private Integer hour; private Integer minute; private int mMyHourOfDay; private int mMyMinute; private int mMyDayOfMonth; private int mMyYear; private int mMyMonth; private boolean mCurrentCheckResult; private Memo mMemo; private boolean mIsNeedTips; private boolean isChanged = false; private ImagePickerConfig mPickerConfig; private String mEditDate; private static final String TAG = "AmendActivity"; @RequiresApi(api = Build.VERSION_CODES.M) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.amend_activity); ButterKnife.bind(this); checkCalendarPremission(); checkImagePremission(); initConfig(); getDate(); initView(); initData(); initEvent(); } /** * 检查是否获取相册的读写权限 * 安卓6.0以上需要动态获取权限 */@RequiresApi(api = Build.VERSION_CODES.M)private void checkImagePremission() { int readExStroagePermission = checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE); Log.d(TAG, "readExStroagePermission" + readExStroagePermission); if (readExStroagePermission == PackageManager.PERMISSION_GRANTED ) { //有权限 } else { //没有权限 requestPermissions(new String[] { Manifest.permission.READ_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE); }}private void initConfig() { mPickerConfig = ImagePickerConfig.getInstance(); mPickerConfig.setMaxSelectedCount(MAX_SELECTED_COUNT); mPickerConfig.setOnImageSelectedFinishLisenter((ImagePickerConfig.OnImageSelectedFinishLisenter) this);} //返回 private void initEvent() { mBackBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //输入获取内容 String title = mTitle.getText().toString().trim(); String body = mContent.getText().toString().trim(); if (!title.equals("") && !body.equals("")) { showBackDialog(title, body); } else { startIntent(); } } }); //保存 mSaveBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //获取输入内容 String title = mTitle.getText().toString().trim(); String body = mContent.getText().toString().trim(); Log.d(TAG, "title is " + title); Log.d(TAG, "body is " + body); if (canDoSave(title, body)) { updateDb(title, body); startIntent(); } } }); //清空 mCleanBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mContent.setText(" "); } }); //监听checkBox的变化 mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { isChanged = true; mCurrentCheckResult = isChecked; //如果被选中 if (mCurrentCheckResult) { mDataPicker.setVisibility(View.VISIBLE); mTimePicker.setVisibility(View.VISIBLE); } else { //如果没有被选中 mDataPicker.setVisibility(View.GONE); mTimePicker.setVisibility(View.GONE); } } }); //选择事件日期 mDataPicker.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(AmendActivity.this, "选择时间" , Toast.LENGTH_SHORT).show(); //选择事件时间 showDataPickerDialog(); } }); //选择提醒时间 mTimePicker.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //选择时间 showTimePickerDialog(); } }); //插入图片 mInsertImage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(AmendActivity.this, PickerActivity.class)); } }); } //指定日历的相关操作，增删改 private void doCalendarEvent() { if (isChanged) { //如果状态改变了 if (mCurrentCheckResult) { //当前选中了，insert Log.d(TAG, "do insert"); } else { //当前没选中，delete Log.d(TAG, "do delete"); } } else { //如果状态没改变 if (mIsNeedTips) { //需要事件提醒,update Log.d(TAG, "do update"); } else { //不需要事件提醒,nothing Log.d(TAG, "do nothing"); } } } //设置提醒事件 private void showTimePickerDialog() { TimePickerDialog.OnTimeSetListener listener = new TimePickerDialog.OnTimeSetListener() { @Override public void onTimeSet(TimePicker view, int hourOfDay, int minute) { mMyHourOfDay = hourOfDay; mMyMinute = minute; mTimePicker.setText(hourOfDay + ":" + minute); } }; TimePickerDialog dialog = new TimePickerDialog(this, 0, listener, mHour, mMinute, true); dialog.show(); } //设置事件日期 private void showDataPickerDialog() { DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener() { @Override public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) { // mMyYear = year; mMyMonth = ++month; mMyDayOfMonth = dayOfMonth; mDataPicker.setText(year + "-" +mMyMonth + "-" + dayOfMonth); } }; DatePickerDialog datePickerDialog = new DatePickerDialog(this, 0, listener, mYear, mMonth, mDay); datePickerDialog.show(); } //能否保存 private boolean canDoSave(String title, String body) { //用于判断能否保存动作 //true:可以保存内容,保存内容至数据库中 //false:不能保存，需要写内容 boolean flag = true; if (title.equals("")) { flag = false; } if (title.length() >10) { flag = false; } if (body.length() > 200) { flag = false; } if (body.equals("")) { flag = false; } if (mCurrentCheckResult) { //如果选中“添加提醒事件”，就需要将日期时间填写完整 if (mDataPicker.getText().toString().equals("") || mTimePicker.getText().toString().equals("")) { flag = false; } } return flag; } //显示dialog private void showBackDialog(final String title, final String body) { AlertDialog.Builder dialog = new AlertDialog.Builder(AmendActivity.this); dialog.setTitle("提示："); dialog.setMessage("是否保存当前内容"); dialog.setPositiveButton("保存", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //将更新保存至数据库中 if (canDoSave(title, body)) { updateDb(title, body); startIntent(); } } }); dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //跳转至首页 startIntent(); } }); dialog.show(); } //将修改内容保存到数据库中 private void updateDb(String title, String body) { ContentValues values = new ContentValues(); values.put(Constants.MEMO_TITLE, title); values.put(Constants.MEMO_BODY, body); values.put(Constants.MEMO_MODIFY_TIME, mEditDate); values.put(Constants.MEMO_NEED_TIPS, mCurrentCheckResult); Log.d(TAG, "mCurrentCheckResult" + mCurrentCheckResult); DataSupport.update(Memo.class, values, mMemo.getId()); Toast.makeText(this, "修改成功！", Toast.LENGTH_SHORT).show(); } //从MainActivity点击到该页面，将数据回显 private void initData() { Intent intent = this.getIntent(); Bundle bundle = intent.getExtras(); //获取bundle中的数据 if (bundle != null) { String memoTitle = intent.getStringExtra(Constants.MEMO_TITLE); String memoContent = intent.getStringExtra(Constants.MEMO_BODY); int memoId = intent.getIntExtra(Constants.MEMO_ID, 0); mIsNeedTips = intent.getBooleanExtra(Constants.MEMO_NEED_TIPS, false); //设置数据 mMemo = new Memo(); mMemo.setTitle(memoTitle); mMemo.setText(memoContent); mMemo.setId(memoId); mMemo.setTipsChecked(mIsNeedTips); if (mIsNeedTips) { //如果设置了提醒事件，就将日期和时间显现出来 mDataPicker.setVisibility(View.VISIBLE); mTimePicker.setVisibility(View.VISIBLE); mCheckBox.setChecked(mIsNeedTips); setDateAndTime(memoTitle); } mContent.setText(memoContent); mContent.setText(memoTitle); } } //根据title获取到设置提醒的日期和时间 private void setDateAndTime(String memoTitle) { ContentResolver contentResolver = getContentResolver(); Uri uri = Uri.parse("content://com.android.calendar/events"); Cursor cursor = contentResolver.query(uri, new String[]{ CalendarContract.Events.DTSTART}, CalendarContract.Events.TITLE + "=" + memoTitle, null, null, null); String[] columnNames = cursor.getColumnNames(); while (cursor.moveToNext()) { for (String columnName : columnNames) { String startTimeStr = cursor.getString(cursor.getColumnIndex(columnName)); //将秒数转化为日期 getTipsDate(startTimeStr); Log.d(TAG, columnName + "==" + startTimeStr); } } } //通过数据库中设置的时间获取提醒事件的时间 private void getTipsDate(String startTimeStr) { long time = Long.parseLong(startTimeStr); Date date = new Date(time); GregorianCalendar gregorianCalendar = new GregorianCalendar(); gregorianCalendar.setTime(date); //将日期格式进行分割：为date+time SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); String currentTime = dateFormat.format(gregorianCalendar.getTime()); Log.d(TAG, "currentTime is" +currentTime); String[] dateAndTime = currentTime.split(" "); String tipsDate = dateAndTime[0]; String tipsTime = dateAndTime[1]; Log.d(TAG, "tipsDate" + tipsDate); Log.d(TAG, "tipsTime" + tipsTime); mDataPicker.setText(tipsDate); mTimePicker.setText(tipsTime); } //初始化当前时间 private void initView() { Date date = new Date(System.currentTimeMillis()); //创建的时间，存入数据库，数据库根据时间先后显示列表 mEditDate = getTimeStr(date); if (mCurrentTime.getText().length() != 0) { mCurrentTime.setText(mEditDate); } dialogDate = null; dialogTime = null; hour = 0; minute = 0; year = 0; month = 0; dayOfMonth = 0; //初始化数据库 Connector.getDatabase(); //获取到之前选择的图片并显示出来 List<ImageItem> selectResult = mPickerConfig.getSelectResult(); int seletcedSize = mPickerConfig.getSeletcedSize(); if (selectResult != null) { for (ImageItem imageItem : selectResult) { Log.d(TAG, "image item is " + imageItem.getPath()); } Log.d(TAG, "selected size is " + seletcedSize); } if (selectResult != null) { //显示图片 switch (seletcedSize) { case 1: Glide.with(mPicOne.getContext()).load(selectResult.get(0).getPath()).into(mPicOne); mPicOne.setVisibility(View.VISIBLE); mPicTwo.setVisibility(View.GONE); mPicThree.setVisibility(View.GONE); break; case 2: Glide.with(mPicOne.getContext()).load(selectResult.get(0).getPath()).into(mPicOne); Glide.with(mPicTwo.getContext()).load(selectResult.get(1).getPath()).into(mPicTwo); mPicOne.setVisibility(View.VISIBLE); mPicTwo.setVisibility(View.VISIBLE); mPicThree.setVisibility(View.GONE); break; case 3: Glide.with(mPicOne.getContext()).load(selectResult.get(0).getPath()).into(mPicOne); Glide.with(mPicTwo.getContext()).load(selectResult.get(1).getPath()).into(mPicTwo); Glide.with(mPicThree.getContext()).load(selectResult.get(2).getPath()).into(mPicThree); mPicOne.setVisibility(View.VISIBLE); mPicTwo.setVisibility(View.VISIBLE); mPicThree.setVisibility(View.VISIBLE); break; } } else { mPicOne.setVisibility(View.GONE); mPicTwo.setVisibility(View.GONE); mPicThree.setVisibility(View.GONE); } } //页面跳转 private void startIntent() { Intent intent = new Intent(AmendActivity.this, MainActivity.class); startActivity(intent); } //检查是否有读写日历的权限 @RequiresApi(api = Build.VERSION_CODES.M) private void checkCalendarPremission() { int writePermission = checkSelfPermission(Manifest.permission.WRITE_CALENDAR); int readPermission = checkSelfPermission(Manifest.permission.READ_CALENDAR); if (writePermission == PackageManager.PERMISSION_GRANTED && readPermission == PackageManager.PERMISSION_GRANTED) { //有读写权限 Log.d(TAG, "has permission..."); } else { //没有读写权限 Log.d(TAG, "no permission"); requestPermissions(new String[] { Manifest.permission.READ_CALENDAR, Manifest.permission.WRITE_CALENDAR}, PERMISSION_REQUEST_CODE); } } //判断请求码结果来决定是否能成功获得权限 @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (requestCode == PERMISSION_REQUEST_CODE) { if (grantResults.length == 3 && grantResults[0] ==PackageManager.PERMISSION_GRANTED && grantResults[1] ==PackageManager.PERMISSION_GRANTED && grantResults[2] ==PackageManager.PERMISSION_GRANTED) { Toast.makeText(this, "有权限", Toast.LENGTH_SHORT).show(); } else { //此时没有权限 finish(); Toast.makeText(this, "没有权限", Toast.LENGTH_SHORT).show(); } } } //获取当前时间 private void getDate() { mCalendar = Calendar.getInstance(); mYear = mCalendar.get(Calendar.YEAR); mCalendar.get(Calendar.MONTH); mDay = mCalendar.get(Calendar.DAY_OF_MONTH); mHour = mCalendar.get(java.util.Calendar.HOUR_OF_DAY); mMinute = mCalendar.get(java.util.Calendar.MINUTE); mSecond = mCalendar.get(Calendar.SECOND); } @Override public void onSelectedFinish(List<ImageItem> selectedResult) { //所选择的图片列表在该处回来了 //设置图片 if (selectedResult != null) { setPics(selectedResult); } } private void setPics(List<ImageItem> selectedResult) { switch (selectedResult.size()) { case 1: Glide.with(mPicOne.getContext()).load(selectedResult.get(0).getPath()).into(mPicOne); mPicOne.setVisibility(View.VISIBLE); mPicTwo.setVisibility(View.GONE); mPicThree.setVisibility(View.GONE); break; case 2: Glide.with(mPicOne.getContext()).load(selectedResult.get(0).getPath()).into(mPicOne); Glide.with(mPicTwo.getContext()).load(selectedResult.get(1).getPath()).into(mPicTwo); mPicOne.setVisibility(View.VISIBLE); mPicTwo.setVisibility(View.VISIBLE); mPicThree.setVisibility(View.GONE); break; case 3: Glide.with(mPicOne.getContext()).load(selectedResult.get(0).getPath()).into(mPicOne); Glide.with(mPicTwo.getContext()).load(selectedResult.get(1).getPath()).into(mPicTwo); Glide.with(mPicThree.getContext()).load(selectedResult.get(2).getPath()).into(mPicThree); mPicOne.setVisibility(View.VISIBLE); mPicTwo.setVisibility(View.VISIBLE); mPicThree.setVisibility(View.VISIBLE); break; } }}四、数据存储
备忘录数据存储采用系统内置的数据库SQLite,利用LitePal进行操作
五、实体类——Memo
package test_5;import org.litepal.crud.DataSupport;public class Memo extends DataSupport { public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getText() { return text; } public void setText(String text) { this.text = text; } public Integer getImageId() { return imageId; } public void setImageId(Integer imageId) { this.imageId = imageId; } public String getCreateTime() { return createTime; } public void setCreateTime(String createTime) { this.createTime = createTime; } public boolean isTipsChecked() { return isTipsChecked; } public void setTipsChecked(boolean tipsChecked) { isTipsChecked = tipsChecked; } private Integer id; private String title; private String text; private String createTime; private boolean isTipsChecked; private Integer imageId;}总结
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