我要做的是,双击电源按钮会发出一个“发送消息”的吐司,无论屏幕是开还是关。无论如何设法编写此代码 我所做的是,我已经记录了电源按钮和电源点击的持续时间。如果它们的差异b / w小于1秒,那么它将提高吐司。 但是只有当屏幕关闭或锁定而不是屏幕打开时它才会提高吐司。怎么做。请帮忙
MainActivity.java
public class MainActivity extends Activity {
@Override
public 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);
BroadcastReceiver mReceiver = new CloseSystemDialogsIntentReceiver();
registerReceiver(mReceiver, filter);
}
@Override
protected void onPause() {
// when the screen is about to turn off
if (CloseSystemDialogsIntentReceiver.wasScreenOn) {
// this is the case when onPause() is called by the system due to a screen state change
System.out.println("SCREEN TURNED OFF");
} else {
// this is when onPause() is called when the screen state has not changed
}
super.onPause();
}
@Override
protected void onResume() {
// only when screen turns on
if (!CloseSystemDialogsIntentReceiver.wasScreenOn) {
// this is when onResume() is called due to a screen state change
System.out.println("SCREEN TURNED ON");
} else {
// this is when onResume() is called when the screen state has not changed
}
super.onResume();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_POWER) {
// Do something here...
Log.d("ONKEYDOWN", "ONKEYDOWN");
event.startTracking(); // Needed to track long presses
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_POWER) {
// Do something here...
Log.d("onKeyLongPress", "ONKEYDOWN");
return true;
}
return super.onKeyLongPress(keyCode, event);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_POWER) {
Log.d("dispatchKeyEvent", "ONKEYDOWN");
return true;
}
return super.dispatchKeyEvent(event);
}
}
CloseSystemDialogsIntentReceiver.java
public class CloseSystemDialogsIntentReceiver扩展BroadcastReceiver {
public static boolean wasScreenOn = true;
static long prevTime=0;
static long currTime=0;
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
// do whatever you need to do here
prevTime = System.currentTimeMillis();
Log.d("CHECK IN RECIVER WHEN ON","CHECK IN RECIVER WHEN ON");
wasScreenOn = false;
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
// and do whatever you need to do here
Log.d("CHECK IN RECIVER WHEN ON","CHECK IN RECIVER WHEN OFF");
currTime = System.currentTimeMillis();
wasScreenOn = true;
}
if (currTime>0 && prevTime>0) {
if ((currTime - prevTime) < 1000 && (currTime - prevTime)>-1000) {
Toast.makeText(context, "double Clicked power button",
Toast.LENGTH_LONG).show();
Log.e("eciver ", "double Clicked power button");
currTime = 0;
prevTime = 0;
}
}
}
}
Android Manifest File
uses-permission android:name="android.permission.PREVENT_POWER_KEY" />