Android 一个简单的警告服务,使用 AlarmManager,
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Android 一个简单的警告服务,使用 AlarmManager,
适合 Android 初学者1.[图片] AndroidAlarmService_01.png
2.main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/startalarm" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Start" /> <Button android:id="@+id/cancelalarm" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Cancel" /> </LinearLayout>
3.AndroidAlarmService.java
package com.exercise.AndroidAlarmService; import java.util.Calendar; import android.app.Activity; import android.app.AlarmManager; import android.app.PendingIntent; import android.content.Intent; import android.os.Bundle; import android.os.SystemClock; import android.view.View; import android.widget.Button; import android.widget.Toast; public class AndroidAlarmService extends Activity { private PendingIntent pendingIntent; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button buttonStart = (Button)findViewById(R.id.startalarm); Button buttonCancel = (Button)findViewById(R.id.cancelalarm); buttonStart.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View arg0) { // TODO Auto-generated method stub Intent myIntent = new Intent(AndroidAlarmService.this, MyAlarmService.class); pendingIntent = PendingIntent.getService(AndroidAlarmService.this, 0, myIntent, 0); AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.SECOND, 10); alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent); Toast.makeText(AndroidAlarmService.this, "Start Alarm", Toast.LENGTH_LONG).show(); }}); buttonCancel.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View arg0) { // TODO Auto-generated method stub AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); alarmManager.cancel(pendingIntent); // Tell the user about what we did. Toast.makeText(AndroidAlarmService.this, "Cancel!", Toast.LENGTH_LONG).show(); }}); } }
4.MyAlarmService.java
package com.exercise.AndroidAlarmService; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.widget.Toast; public class MyAlarmService extends Service { @Override public void onCreate() { // TODO Auto-generated method stub Toast.makeText(this, "MyAlarmService.onCreate()", Toast.LENGTH_LONG).show(); } @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub Toast.makeText(this, "MyAlarmService.onBind()", Toast.LENGTH_LONG).show(); return null; } @Override public void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG).show(); } @Override public void onStart(Intent intent, int startId) { // TODO Auto-generated method stub super.onStart(intent, startId); Toast.makeText(this, "MyAlarmService.onStart()", Toast.LENGTH_LONG).show(); } @Override public boolean onUnbind(Intent intent) { // TODO Auto-generated method stub Toast.makeText(this, "MyAlarmService.onUnbind()", Toast.LENGTH_LONG).show(); return super.onUnbind(intent); } }
5.AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.exercise.AndroidAlarmService" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".AndroidAlarmService" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:name=".MyAlarmService" /> </application> <uses-sdk android:minSdkVersion="4" /> </manifest>
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