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我絕對是Android的初學者。我在1周前開始學習Android。所以現在我正在嘗試自己開發一個待辦事項列表應用程序，以便快速提高我的技能。我的應用不在線。但在我的應用程序中，我需要每天通知用戶任務任務。所以我需要在後臺爲它啓動事件，即使我的應用程序沒有運行。所以我試圖通過創建一個簡單的項目來在每個時間間隔內顯示簡單的Toast消息來將AlaramManager與BoradcasrReceiver集成。但它是拋出錯誤。此代碼不是待辦事宜代碼。我只是測試後臺事件啓動，即使我的應用程序沒有運行。但是當我運行這個代碼。這是拋出錯誤。請問我的代碼有什麼問題？請糾正我。在Android中使用BroadcastReceiver和AlarmManager進行間隔任務的錯誤
這是我的Android清單文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.bgnotification.bgnotification" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".RemainderReceiver"></receiver>
</application>
</manifest>
這是活動類
public class MainActivity extends AppCompatActivity {
private RemainderReceiver remainderReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
remainderReceiver = new RemainderReceiver();
remainderReceiver.startRemainder(this.getApplicationContext());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
這是廣播接收器
public class RemainderReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "YOUR TAG");
//Acquire the lock
wl.acquire();
Toast.makeText(context,"my message", Toast.LENGTH_SHORT).show();
wl.release();
}
public void startRemainder(Context context)
{
AlarmManager am = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context,RemainderReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(context,0,intent,0);
am.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(),1000*2,pi);
}
}
這是logcat的，當我運行這個程序
01-23 09:45:33.853 2029-2029/? D/AndroidRuntime: Shutting down VM
01-23 09:45:33.853 2029-2029/? W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xa615a908)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: FATAL EXCEPTION: main
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: java.lang.RuntimeException: Unable to start receiver com.example.bgnotification.bgnotification.RemainderReceiver: java.lang.SecurityException: Neither user 10058 nor current process has android.permission.WAKE_LOCK.
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread.handleReceiver(ActivityThread.java:2383)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread.access$1500(ActivityThread.java:141)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1310)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5041)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: Caused by: java.lang.SecurityException: Neither user 10058 nor current process has android.permission.WAKE_LOCK.
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1425)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1379)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.IPowerManager$Stub$Proxy.acquireWakeLock(IPowerManager.java:271)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.PowerManager$WakeLock.acquireLocked(PowerManager.java:717)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.PowerManager$WakeLock.acquire(PowerManager.java:686)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at com.example.bgnotification.bgnotification.RemainderReceiver.onReceive(RemainderReceiver.java:22)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread.handleReceiver(ActivityThread.java:2376)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread.access$1500(ActivityThread.java:141)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1310)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5041)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-23 09:45:33.853 2029-2029/? E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
01-23 09:45:33.853 476-1662/? W/ActivityManager: Force finishing activity com.example.bgnotification.bgnotification/.MainActivity
01-23 09:45:33.909 476-1662/? D/dalvikvm: GC_FOR_ALLOC freed 2598K, 47% free 6995K/13080K, paused 9ms, total 9ms
01-23 09:45:33.937 476-492/? D/dalvikvm: GC_FOR_ALLOC freed 57K, 40% free 7894K/13080K, paused 19ms, total 19ms
01-23 09:45:33.957 476-479/? D/dalvikvm: GC_CONCURRENT freed 100K, 31% free 9117K/13080K, paused 1ms+5ms, total 19ms
01-23 09:45:33.969 476-492/? I/dalvikvm-heap: Grow heap (frag case) to 11.451MB for 2536932-byte allocation
01-23 09:45:33.993 476-484/? D/dalvikvm: GC_FOR_ALLOC freed <1K, 26% free 11594K/15560K, paused 25ms, total 25ms
01-23 09:45:34.021 476-479/? D/dalvikvm: GC_CONCURRENT freed 69K, 25% free 11770K/15560K, paused 2ms+1ms, total 30ms
01-23 09:45:34.413 476-488/? W/ActivityManager: Activity pause timeout for ActivityRecord{532d55cc u0 com.example.bgnotification.bgnotification/.MainActivity}
01-23 09:45:34.441 679-679/? W/EGL_genymotion: eglSurfaceAttrib not implemented
01-23 09:45:34.513 476-544/? I/qtaguid: Failed write_ctrl(s 0 10058) res=-1 errno=1
01-23 09:45:34.513 476-544/? W/NetworkManagementSocketTagger: setKernelCountSet(10058, 0) failed with errno -1
01-23 09:45:44.513 476-488/? W/ActivityManager: Activity destroy timeout for ActivityRecord{532d55cc u0 com.example.bgnotification.bgnotification/.MainActivity}
有什麼錯誤嗎？
需要在清單<使用許可權的Android添加以下權限：NAME =」 android.permission.WAKE_LOCK「/> – Muthu