屏幕打开时启动活动

Question

我为adnroid设计了一个锁屏.当用户按下电源按钮解锁时,我正在尝试使用广播接收器来启动锁屏活动.

public class Receiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)){
        Log.w("BAM", "Screen went on");
    }

    else if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){
        Log.w("BAM","Screen went off");
    }
}

}

android清单:`

<uses-sdk
    android:minSdkVersion="7"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MyLockScreenActivity"
        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="MyAdminReceiver"
        android:permission="android.permission.BIND_DEVICE_ADMIN">
        <meta-data
            android:name="android.app.device_admin"
            android:resource="@xml/admin"/>

        <intent-filter>
            <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
        </intent-filter>
    </receiver>
    <receiver android:name=".Receiver">
      <intent-filter>
        <action android:name="android.intent.action.USER_PRESENT" />
        <action android:name="android.intent.action.ACTION_SHUTDOWN" />
     </intent-filter>
    </receiver>
    <activity android:name=".LockScreen"></activity>
</application>

`

private ActionBar actionBar;
private ViewPager viewer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.lockscreen);
    actionBar = getSupportActionBar();
    actionBar.hide();

    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
    filter.addAction(Intent.ACTION_SCREEN_OFF);
    BroadcastReceiver mReceiver = new Receiver();
    registerReceiver(mReceiver, filter);

    viewer = (ViewPager) findViewById(R.id.viewr);
    viewer.setAdapter(new MyAdapter(getSupportFragmentManager()));
}

但是当用户按下电源按钮时,锁定屏活动在1-3秒后开始.当用户先按下电源按钮屏幕关闭时启动活动是否合适？我该怎么做？

感谢您的意见.(对不起,我的英语不好!)

Answer 1

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首先，与其他广泛传播的意图不同，对于 Intent.ACTION_SCREEN_OFF 和 Intent.ACTION_SCREEN_ON，您不能在 Android 清单中声明它们！I\xe2\x80\x99m 不确定具体原因，但它们必须在 JAVA 代码中的 IntentFilter 中注册

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使用：

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再次编辑

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public class YourActivity extends Activity {\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.YourLayout);\n\n        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);\n        filter.addAction(Intent.ACTION_SCREEN_OFF);\n        BroadcastReceiver mReceiver = new ScreenReceiver();\n        registerReceiver(mReceiver, filter);\n    }\n\n    public class ScreenReceiver extends BroadcastReceiver{\n        @Override\n        public void onReceive(Context context, Intent intent) {\n\n            if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)){\n                Log.w("BAM", "Screen went on");\n            }\n\n            else if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){\n                Log.w("BAM","Screen went off");\n            }\n        }\n    }\n} \n

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已测试，有效！

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