android - 4 次电源按钮按下通话功能

Question

我已经创建了一个方法来发送 SMS 并在函数 callfunction(); 下调用我想在用户按下四次电源按钮时调用该函数，它不应该要求应用程序应处于启动状态。

Answer 1

尝试使用 Power Manager

PARTIAL_WAKE_LOCK

added in API level 1 int PARTIAL_WAKE_LOCK Wake lock level: Ensures that the CPU is running; the screen and keyboard backlight will be allowed to go off.

If the user presses the power button, then the screen will be turned off but the CPU will be kept on until all partial wake locks have been released.

Constant Value: 1 (0x00000001)

例子:

//Initialize the Power Manager
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

 //Create a PARTIAL_WAKE_LOCK
 //This will keep the cpu running in the Background, so that the function will be called on the desired Time
 PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "My Tag");

//Check if the WackLock is held (may throw erro if you try to acquire twice)
//TRUE --> Do nothing, all good
//FALSE --> Acquire the WakeLock
 if(!wl.isHeld()){
    wl.acquire();
 }

//*****
//You code to handel the Powerbutton comes here
//*****

//If the Repeating task is not active, release the Lock

//Check if the WackLock is held (may throw error if you try to release a none acquired Lock)
//TRUE --> Release Lock
//FALSE --> Do nothing, all good
 if(wl.isHeld()){
    wl.release();
 }

要处理电源按钮，请查看此帖子: How to hook into the Power button in Android?

这只是一个假设，如果它仍然不起作用，你能发布一些日志或你项目的更多代码 fragment :)