Question

编辑：任何偶然发现这种情况的人都可能想知道，要在重新启动后触发警报，您需要在Manifest中注册它而不是运行时。

我使用Here的指南设计了以下课程：

public class MainActivity extends Activity {
    private AlarmManager alarmMgr;
    private PendingIntent alarmIntent;
    BroadcastReceiver br;
    TextView t; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setup(); 
        t = (TextView)findViewById(R.id.textView1);


        ComponentName receiver = new ComponentName(getApplicationContext(), SampleBootReceiver.class);
        PackageManager pm = getApplicationContext().getPackageManager();

        pm.setComponentEnabledSetting(receiver,
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                PackageManager.DONT_KILL_APP);


        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(System.currentTimeMillis());
        calendar.set(Calendar.HOUR_OF_DAY, 10);
        calendar.set(Calendar.MINUTE, 22); // Particular minute
        calendar.set(Calendar.SECOND, 0);
        alarmMgr = (AlarmManager)getApplicationContext().getSystemService(Context.ALARM_SERVICE);
        alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                1000*60*60*24, alarmIntent);
    }


    public void setup() {
        br = new BroadcastReceiver() {
            @Override
            public void onReceive(Context c, Intent i) {
                Toast.makeText(c, "Rise and Shine!", Toast.LENGTH_LONG).show();
                //Invoke the service here Put the wake lock and initiate bind service
                t.setText("Hello Alarm set");
            }
        };
        registerReceiver(br, new IntentFilter("com.testrtc") );
        alarmIntent = PendingIntent.getBroadcast( this, 0, new Intent("com.testrtc"),
                0 );
        alarmMgr = (AlarmManager)(this.getSystemService( Context.ALARM_SERVICE ));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

我有一个SampleBootReceiver类：

public class SampleBootReceiver extends BroadcastReceiver {
    private AlarmManager alarmMgr;
    private PendingIntent alarmIntent;
    BroadcastReceiver br;
    TextView t; 

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            Toast.makeText(context, "Hello from Bootloader", 10000).show();
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.HOUR_OF_DAY, 10);
            calendar.set(Calendar.MINUTE, 22); // Particular minute
            calendar.set(Calendar.SECOND, 0);
             alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
             alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                        1000*60*60*24, alarmIntent);


        }
    }
}

这是我的清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.testrtc"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.testrtc.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name=".SampleBootReceiver"
            android:enabled="false" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" >
                </action>
            </intent-filter>
        </receiver>
    </application>

</manifest>

重启之前警报工作正常，重启后我也从BootReceiver类获取Toast消息。但警报不会重置。在这里，我想澄清一点，因为Docs声明除非应用程序至少由用户启动一次，否则警报不会被重置：Set the RECEIVE_BOOT_COMPLETED permission in your application's manifest. This allows your app to receive the ACTION_BOOT_COMPLETED that is broadcast after the system finishes booting (this only works if the app has already been launched by the user at least once):此声明的上下文是什么？如果用户必须重新启动应用程序，则无论如何都会调用onCreate并再次设置警报。或者这句话是否意味着在整个生命周期中，应用程序必须至少在手机上运行一次？

Answer 1

我想，你报警工作正常，但是当你的SampleBootReceiver在启动完成后再次启动时我不会调用setup（）方法。

在SampleBootReceiver中再次添加此行以获取alarmIntent

 registerReceiver(br, new IntentFilter("com.testrtc") );
        alarmIntent = PendingIntent.getBroadcast( this, 0, new Intent("com.testrtc"),
                0 );
        alarmMgr = (AlarmManager)(this.getSystemService( Context.ALARM_SERVICE ));

由于

重启后Android警报不会触发：

1 个答案: