Android学习07-----事件处理(3)监听日期与时间的改变_焦点事件_长按事件(修改桌面)

四、监听日期与时间的改变

main.xml ：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <EditText        android:id="@+id/input"        android:layout_width="fill_parent"        android:layout_height="wrap_content" />        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >            <DatePicker             android:id="@+id/date"            android:layout_width="wrap_content"    android:layout_height="wrap_content"/>                <TimePicker            android:id="@+id/time"            android:layout_width="wrap_content"    android:layout_height="wrap_content"/>        </LinearLayout></LinearLayout>

Activity:

package com.iflytek.activity;import android.app.Activity;import android.os.Bundle;import android.widget.DatePicker;import android.widget.DatePicker.OnDateChangedListener;import android.widget.EditText;import android.widget.TimePicker;import android.widget.TimePicker.OnTimeChangedListener;public class EventActivity extends Activity {private EditText input = null;private DatePicker date = null;private TimePicker time = null;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.main);input = (EditText) super.findViewById(R.id.input);date = (DatePicker) super.findViewById(R.id.date);time = (TimePicker) super.findViewById(R.id.time);// 设置24小时制显示时间this.time.setIs24HourView(true);// 时间监听this.time.setOnTimeChangedListener(new OnTimeChangedListenerImpl());// 日期监听器，注意这里的日期监听方式和以前有所区别this.date.init(this.date.getYear(), this.date.getMonth(),this.date.getDayOfMonth(), new OnDateChangedListenerImpl());this.setDateTime();}private class OnTimeChangedListenerImpl implements OnTimeChangedListener {@Overridepublic void onTimeChanged(TimePicker view, int hourOfDay, int minute) {EventActivity.this.setDateTime();}}private class OnDateChangedListenerImpl implements OnDateChangedListener {@Overridepublic void onDateChanged(DatePicker view, int year, int monthOfYear,int dayOfMonth) {EventActivity.this.setDateTime();}}public void setDateTime() {//注意这里的月份是从0开始的this.input.setText(this.date.getYear() + "-" + (this.date.getMonth()+1)+ "-" + this.date.getDayOfMonth() + " "+ this.time.getCurrentHour() + ":"+ this.time.getCurrentMinute());}}

五、焦点事件

验证输入 Demo

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" ><EditTextandroid:id="@+id/edit"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="请输入查询内容"/><EditTextandroid:id="@+id/msg"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="xdwang"/><TextView android:id="@+id/txt"android:layout_width="fill_parent"android:layout_height="wrap_content"/></LinearLayout>

Activity:

package com.iflytek.activity;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.widget.EditText;import android.widget.TextView;public class EventActivity extends Activity {private EditText edit = null;private TextView txt = null;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.main);this.edit = (EditText) super.findViewById(R.id.edit);this.txt = (TextView) super.findViewById(R.id.txt);this.edit.setOnClickListener(new OnClickListenerImpl());this.edit.setOnFocusChangeListener(new OnFocusChangeListenerImpl());}private class OnClickListenerImpl implements OnClickListener {@Overridepublic void onClick(View v) {EventActivity.this.edit.setText("");// 清空文本}}private class OnFocusChangeListenerImpl implements OnFocusChangeListener {@Overridepublic void onFocusChange(View view, boolean hasFocus) {// view表示操作的组件，hasFocus表示是否获得焦点if (hasFocus) {// 已经获得了焦点EventActivity.this.txt.setText("获得了焦点");} else {if (EventActivity.this.edit.getText().length() > 0) {// 现在有数据EventActivity.this.txt.setText("文本输入组件失去焦点，输入内容合法");} else {EventActivity.this.txt.setText("文本输入组件失去焦点，输入内容不能为空！");}}}}}

六、长按事件

设置桌面 Demo

Main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" ><TextView android:id="@+id/info"android:layout_width="fill_parent"android:layout_height="wrap_content" android:text="长按图片将设置为桌面背景" /><ImageViewandroid:id="@+id/img"android:layout_width="fill_parent"android:layout_height="fill_parent"android:src="@drawable/james_java"/> </LinearLayout>

AndroidManifest.xml加上：

       <!-- 允许设置桌面 -->    <uses-permission android:name="android.permission.SET_WALLPAPER" />

Activity：

package com.iflytek.activity;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnLongClickListener;import android.widget.ImageView;import android.widget.TextView;public class EventActivity extends Activity {private TextView info = null;private ImageView img = null;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.main);this.img = (ImageView) super.findViewById(R.id.img);this.info = (TextView) super.findViewById(R.id.info);this.img.setOnLongClickListener(new OnLongClickListenerImpl());}private class OnLongClickListenerImpl implements OnLongClickListener {@Overridepublic boolean onLongClick(View v) {try {EventActivity.this.clearWallpaper();// 清除已有的桌面EventActivity.this.setWallpaper(EventActivity.this.img.getResources().openRawResource(R.drawable.james_java));// 设置桌面EventActivity.this.info.setText("桌面背景已修改.");} catch (Exception e) {e.printStackTrace() ;EventActivity.this.info.setText("桌面背景修改失败！");}return false;}}}

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