休眠的過程是屏幕先變灰再變黑，想要實現在自動休眠灰屏時，點擊后（屏幕會變亮）實現一些操作。試了以下兩種方案：1、注冊SCREEN_BRIGHTNESS廣播，嘗試獲取屏幕的變化，無果，應該是android自身沒有發送對應的廣播消息2、點擊時獲取系統的亮度值，（通過oldBrightness = getInt(getContentResolver(), SCREEN_BRIGHTNESS);）但發現還是255，即還是亮，所以無法判斷。
2 回答
慕虎7371278
TA貢獻1802條經驗 獲得超4個贊
系統會發送廣播
Intent.ACTION_SCREEN_OFF
Intent.ACTION_SCREEN_ON
Intent.ACTION_USER_PRESENT
白衣染霜花
TA貢獻1796條經驗 獲得超10個贊
捕捉自動休眠灰屏的事件，可以通過監聽系統的廣播獲得當前手機屏幕的狀態，廣播需要在注冊文件中注冊，具體的實現代碼如下：
public class ScreenListener {
private Context mContext;
private ScreenBroadcastReceiver mScreenReceiver;
private ScreenStateListener mScreenStateListener;
public ScreenListener(Context context) {
mContext = context;
mScreenReceiver = new ScreenBroadcastReceiver();
}
/**
* screen狀態廣播接收者
*/
private class ScreenBroadcastReceiver extends BroadcastReceiver {
private String action = null;
@Override
public void onReceive(Context context, Intent intent) {
action = intent.getAction();
if (Intent.ACTION_SCREEN_ON.equals(action)) { // 開屏
mScreenStateListener.onScreenOn();
} else if (Intent.ACTION_SCREEN_OFF.equals(action)) { // 鎖屏
mScreenStateListener.onScreenOff();
} else if (Intent.ACTION_USER_PRESENT.equals(action)) { // 解鎖
mScreenStateListener.onUserPresent();
}
}
}
/**
* 開始監聽screen狀態
*
* @param listener
*/
public void begin(ScreenStateListener listener) {
mScreenStateListener = listener;
registerListener();
getScreenState();
}
/**
* 獲取screen狀態
*/
private void getScreenState() {
PowerManager manager = (PowerManager) mContext
.getSystemService(Context.POWER_SERVICE);
if (manager.isScreenOn()) {
if (mScreenStateListener != null) {
mScreenStateListener.onScreenOn();
}
} else {
if (mScreenStateListener != null) {
mScreenStateListener.onScreenOff();
}
}
}
/**
* 停止screen狀態監聽
*/
public void unregisterListener() {
mContext.unregisterReceiver(mScreenReceiver);
}
/**
* 啟動screen狀態廣播接收器
*/
private void registerListener() {
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
mContext.registerReceiver(mScreenReceiver, filter);
}
public interface ScreenStateListener {// 返回給調用者屏幕狀態信息
public void onScreenOn();
public void onScreenOff();
public void onUserPresent();
}
}
在上面的代碼中,用到了動態注冊廣播,在需要監聽屏幕狀態的activity中,當不需要監聽的時候,如activity finish的時候,使用unregisterListener解除廣播監聽;
下面是在Activity中調用;
ScreenListener l = new ScreenListener(this);
l.begin(new ScreenStateListener() {
@Override
public void onUserPresent() {
Log.e("onUserPresent", "onUserPresent");
}
@Override
public void onScreenOn() {
Log.e("onScreenOn", "onScreenOn");
}
@Override
public void onScreenOff() {
Log.e("onScreenOff", "onScreenOff");
}
});
通過以上步驟即實現了對屏幕狀態的監聽.
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