最近在做视频播放器的时候,遇到一个问题,在用户播放视频然后锁屏之后,视频播放器仍然在继续播放,遇到类似手机系统状态改变的问题的时候,首先想到了广播(don't call me,i will call you);在网上搜罗了一个方法,做个总结;
public class ScreenListener {private Context mContext;private ScreenBroadcastReceiver mScreenReceiver;private ScreenStateListener mScreenStateListener;public ScreenListener(Context context) {mContext = context;mScreenReceiver = new ScreenBroadcastReceiver();}/*** screen状态广播接收者*/private class ScreenBroadcastReceiver extends BroadcastReceiver {private String action = null;@Overridepublic void onReceive(Context context, Intent intent) {action = intent.getAction();if (Intent.ACTION_SCREEN_ON.equals(action)) { // 开屏mScreenStateListener.onScreenOn();} else if (Intent.ACTION_SCREEN_OFF.equals(action)) { // 锁屏mScreenStateListener.onScreenOff();} else if (Intent.ACTION_USER_PRESENT.equals(action)) { // 解锁mScreenStateListener.onUserPresent();}}}/*** 开始监听screen状态* * @param listener*/public void begin(ScreenStateListener listener) {mScreenStateListener = listener;registerListener();getScreenState();}/*** 获取screen状态*/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状态监听*/public void unregisterListener() {mContext.unregisterReceiver(mScreenReceiver);}/*** 启动screen状态广播接收器*/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 {// 返回给调用者屏幕状态信息public void onScreenOn();public void onScreenOff();public void onUserPresent();}}
在上面的代码中,用到了动态注册广播,在需要监听屏幕状态的activity中,当不需要监听的时候,如activity finish的时候,使用unregisterListener解除广播监听;
下面是在Activity中调用;
ScreenListener l = new ScreenListener(this);l.begin(new ScreenStateListener() {@Overridepublic void onUserPresent() {Log.e("onUserPresent", "onUserPresent");}@Overridepublic void onScreenOn() {Log.e("onScreenOn", "onScreenOn");}@Overridepublic void onScreenOff() {Log.e("onScreenOff", "onScreenOff");}});
通过以上步骤即实现了对屏幕状态的监听.
