Question

每当用户双击电源按钮时，我正在创建一个我想要启动活动的程序。

但是，当我启动我的应用程序并点击“主页”按钮并将其最小化时，之后，MyRecevier正在计算LOGCAT中可见的电源按钮计数，但MyReceiver无法启动（在屏幕上显示）最小化活动，即主要活动或任何其他新活动。

记录：

02-28 09:58:06.985: E/In on receive(1166): In Method:  ACTION_SCREEN_OFF
02-28 09:58:07.670: E/In on receive(1166): In Method:  ACTION_SCREEN_ON
02-28 09:58:38.170: E/In on receive(1166): In Method:  ACTION_SCREEN_OFF
02-28 09:59:31.355: E/In on receive(1166): In Method:  ACTION_SCREEN_ON

MyReceiver.java：

public class MyReceiver extends BroadcastReceiver 
{
    private static int countPowerOff = 0;

    public MyReceiver ()
    {

    }

    @Override
    public void onReceive(Context context, Intent intent)
    {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
        {    
            Log.e("In on receive", "In Method:  ACTION_SCREEN_OFF");
            countPowerOff++;
        }
        else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
        {
            Log.e("In on receive", "In Method:  ACTION_SCREEN_ON");
        }
        else if(intent.getAction().equals(Intent.ACTION_USER_PRESENT))
        {
            Log.e("In on receive", "In Method:  ACTION_USER_PRESENT");
            if (countPowerOff > 2)
            {
                countPowerOff=0;
                Toast.makeText(context, "MAIN ACTIVITY IS BEING CALLED ", Toast.LENGTH_LONG).show();
                Intent i = new Intent(context, MainActivity.class);
                i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TOP);
                context.startActivity(i);
            }
        }
    }
}

MainActivity.java：

public class MainActivity extends Activity {

    private MyReceiver myReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        myReceiver = new MyReceiver();
        registerReceiver(myReceiver, filter);
    }

    @Override
    protected void onDestroy() 
    {
        if (myReceiver != null)
        {
            unregisterReceiver(myReceiver);
            myReceiver = null;
        }           
        super.onDestroy();
    }

}

的Manifest.xml： -

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.powermagic.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="MyReceiver" /> 

    </application>

Answer 1

顺便说一句，if (countPowerOff > 2)意味着必须按3次。不是两个。点击次数为2时给它一个＆gt; =

按两次电源按钮启动活动

1 个答案: