搜索栏+流式布局+数据库
要求：自定义View实现搜索控件；流式布局；sqlite数据库
总的效果图：
//一.布局
1.搜索栏的展示：
LinearLayout
xmlns:android=“http://schemas.android.com/apk/res/android” android:layout_width=“match_parent”
android:layout_height=“match_parent”>
/LinearLayout>
**创建一个类加载头部布局 查找控件。
public class MyView extends LinearLayout {
private EditText editText;private TextView mCancel;public MyView(Context context, AttributeSet attrs) { super(context, attrs); LayoutInflater.from(context).inflate(R.layout.header_view,this); editText = findViewById(R.id.Search_Edit); mCancel = findViewById(R.id.Cancel_Text);}}
2.搜索历史的展示：
LinearLayout
xmlns:android=“http://schemas.android.com/apk/res/android” android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:orientation=“vertical”>
/LinearLayout>
3.总的布局：
LinearLayout xmlns:android=“http://schemas.android.com/apk/res/android”
xmlns:app=“http://schemas.android.com/apk/res-auto”
xmlns:tools=“http://schemas.android.com/tools”
android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:orientation=“vertical”
tools:context=".MainActivity">
/LinearLayout>
二、具体的代码执行
1.流式布局内容实现
①新建一个类MyFlawLayout继承LinearLayout
②public class MyFlawLayout extends LinearLayout {
private final int mScreenWidth;public MyFlawLayout(Context context, AttributeSet attrs) { super(context, attrs); //得到屏幕的宽高 DisplayMetrics metrics = context.getResources().getDisplayMetrics(); mScreenWidth = metrics.widthPixels; int mScreenHeight= metrics.heightPixels; //设置布局垂直显示 setOrientation(VERTICAL);}public void getData(List data){ LinearLayout linearLayout = getlinearLayout(); for (int i = 0; i =textWidth+LinWith){ linearLayout.addView(textView); }else { linearLayout=getlinearLayout(); linearLayout.addView(textView); } }}//初始化子LinearLayoutpublic LinearLayout getlinearLayout(){ LinearLayout linearLayout = new LinearLayout(getContext()); LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); linearLayout.setLayoutParams(params); this.addView(linearLayout);//this本类对象 只要重新添加View就自动换行了 return linearLayout;}//初始化TextViewpublic TextView getTextView(){ TextView textView = new TextView(getContext()); textView.setTextSize(20); //textView框的样式 textView.setBackgroundResource(R.drawable.item); textView.setTextColor(Color.parseColor("#FF181718")); textView.setPadding(10,10,10,10); return textView;} }
2.MainActivity
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private String[] data = new String[]{"闪电法师", "山东干豆腐", "风格", "大红色进口范德萨发货", "闪电法师", "山东干豆腐", "风格", "大使馆的方法都不", "护甲", "极度疯狂"};private List list = new ArrayList<>();private EditText Search_Edit;private TextView Cancel_Text;private TextView history_delete;private MyFlawLayout lishi_MyFlaw;private ContentResolver resolver;private Uri uri;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); resolver = getContentResolver(); uri = Uri.parse("content://com.example.shujvku.provider.MyProvider/zhou"); initView(); //流式布局 MyFlawLayout myFlawLayout = findViewById(R.id.myFlaw); for (int i = 0; i < data.length; i++) { list.add(data[i]); } myFlawLayout.getData(list);}//得到数据库的数据private List getSel(){ List mhistory = new ArrayList<>(); Cursor cursor = resolver.query(uri, null, null, null, null); while (cursor.moveToNext()){ String uname = cursor.getString(cursor.getColumnIndex("name")); mhistory.add(uname); } //查到数据后在第一个显示 List mString=new ArrayList<>(); for (int i = mhistory.size()-1; i >=0; i--) { mString.add(mhistory.get(i)); } return mString;}private void initView() { Search_Edit = (EditText) findViewById(R.id.Search_Edit); Cancel_Text = (TextView) findViewById(R.id.Cancel_Text); history_delete = (TextView) findViewById(R.id.history_delete); lishi_MyFlaw = (MyFlawLayout) findViewById(R.id.lishi_MyFlaw); List sel = getSel(); lishi_MyFlaw.getData(sel); Cancel_Text.setOnClickListener(this); history_delete.setOnClickListener(this);}//搜索的方法private void submit() { // validate String Edit = Search_Edit.getText().toString().trim(); if (TextUtils.isEmpty(Edit)) { Toast.makeText(this, "输入搜索的内容", Toast.LENGTH_SHORT).show(); return; }else{ Toast.makeText(this, Edit, Toast.LENGTH_SHORT).show(); ContentValues values=new ContentValues(); values.put("name",Search_Edit.getText().toString().trim()); resolver.insert(uri,values); //实时更新数据 lishi_MyFlaw.removeAllViews(); List sel = getSel(); lishi_MyFlaw.getData(sel); }}//点击事件@Overridepublic void onClick(View v) { switch (v.getId()){ case R.id.Cancel_Text: submit(); break; case R.id.history_delete: List strings = getSel(); for (int i = 0; i }
3.创建MyHelper在数据库创建表格，MyProvider查询 删除