Android的 - 如何接收广播意图ACTION_SCREEN_ON / OFF?
题
<application>
<receiver android:name=".MyBroadcastReceiver" android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.ACTION_SCREEN_ON"></action>
<action android:name="android.intent.action.ACTION_SCREEN_OFF"></action>
</intent-filter>
</receiver>
...
</application>
MyBroadcastReceiver
设置只是为了吐FOO的日志。什么也没做。
任何建议请?我需要分配任何权限赶上意图是什么?
解决方案
我认为,这些动作可以仅由在Java代码(通过registerReceiver()
)注册的接收器来接收,而不是通过在清单中注册的接收器。
其他提示
或者,也可以使用功率管理器来检测屏幕锁定。
@Override
protected void onPause()
{
super.onPause();
// If the screen is off then the device has been locked
PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
boolean isScreenOn;
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
isScreenOn = powerManager.isInteractive();
} else {
isScreenOn = powerManager.isScreenOn();
}
if (!isScreenOn) {
// The screen has been locked
// do stuff...
}
}
"android.intent.action.HEADSET_PLUG"
"android.intent.action.ACTION_SCREEN_ON"
"android.intent.action.ACTION_SCREEN_OFF"
上述其中三个,它们不能使用登记清单。 机器人芯加入“Intent.FLAG_RECEIVER_REGISTERED_ONLY”他们(也许..我只在“HEADSET_PLUG”情况下检查码。
所以,我们应该用“动态注册”。 象下面...
private BroadcastReceiver mPowerKeyReceiver = null;
private void registBroadcastReceiver() {
final IntentFilter theFilter = new IntentFilter();
/** System Defined Broadcast */
theFilter.addAction(Intent.ACTION_SCREEN_ON);
theFilter.addAction(Intent.ACTION_SCREEN_OFF);
mPowerKeyReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String strAction = intent.getAction();
if (strAction.equals(Intent.ACTION_SCREEN_OFF) || strAction.equals(Intent.ACTION_SCREEN_ON)) {
// > Your playground~!
}
}
};
getApplicationContext().registerReceiver(mPowerKeyReceiver, theFilter);
}
private void unregisterReceiver() {
int apiLevel = Build.VERSION.SDK_INT;
if (apiLevel >= 7) {
try {
getApplicationContext().unregisterReceiver(mPowerKeyReceiver);
}
catch (IllegalArgumentException e) {
mPowerKeyReceiver = null;
}
}
else {
getApplicationContext().unregisterReceiver(mPowerKeyReceiver);
mPowerKeyReceiver = null;
}
}
我实现,这是通过在我的onCreate()主要活动注册所述接收器的方式,只是限定了接收器预先某处:
lockScreenReceiver = new LockScreenReceiver();
IntentFilter lockFilter = new IntentFilter();
lockFilter.addAction(Intent.ACTION_SCREEN_ON);
lockFilter.addAction(Intent.ACTION_SCREEN_OFF);
lockFilter.addAction(Intent.ACTION_USER_PRESENT);
registerReceiver(lockScreenReceiver, lockFilter);
和然后的onDestroy():
unregisterReceiver(lockScreenReceiver);
在接收机必须赶在下列情况下:
public class LockScreenReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
if (intent != null && intent.getAction() != null)
{
if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
{
// Screen is on but not unlocked (if any locking mechanism present)
}
else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
{
// Screen is locked
}
else if (intent.getAction().equals(Intent.ACTION_USER_PRESENT))
{
// Screen is unlocked
}
}
}
}
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