Question

我正在开发一款应用来播放视频。 BroadCastReceiver接收AC_PPWER_CONNECTED并启动VideoViewActivity。我可以听到视频的声音，但是屏幕关闭，要么我想用一把锁打开它。

以下代码不起作用。

package org.adem.activities;

import java.util.ArrayList;
import org.adem.R;

import android.app.Activity;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.media.MediaPlayer.OnVideoSizeChangedListener;
import android.os.Bundle;
import android.os.PowerManager;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

public class VideoViewActivity extends Activity implements
        OnBufferingUpdateListener, OnCompletionListener,
        OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback {

    private static final String TAG = VideoViewActivity.class.getSimpleName();
    private int mVideoWidth;
    private int mVideoHeight;
    private MediaPlayer mMediaPlayer;
    private SurfaceView mPreview;
    private SurfaceHolder holder;
    private Bundle extras;
    private boolean mIsVideoSizeKnown = false;
    private boolean mIsVideoReadyToBePlayed = false;
    private ArrayList<String> pathList;
    private int videoQueueSize;
    private int currentPosition;
    PowerManager.WakeLock wl;
    KeyguardLock lock;

    /**
     * 
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstance) {
        super.onCreate(savedInstance);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.player);


        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        wl = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, TAG);

        KeyguardManager keyguardManager = (KeyguardManager) getSystemService(Activity.KEYGUARD_SERVICE);
        lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
        lock.disableKeyguard();

        mPreview = (SurfaceView) findViewById(R.id.surfaceView);
        holder = mPreview.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        extras = getIntent().getExtras();
    }

    private void playVideo() {

        if ("".equals(pathList.get(currentPosition))) {
            // Tell the user to provide a media file URL.
            Toast.makeText(
                    VideoViewActivity.this,
                    "Please edit MediaPlayerDemo_Video Activity, "
                    + "and set the path variable to your media file path."
                    + " Your media file must be stored on sdcard.",
                    Toast.LENGTH_LONG).show();
            return;

        } else {
            try {

                // Create a new media player and set the listeners
                releaseMediaPlayer();
                mMediaPlayer = new MediaPlayer();
                mMediaPlayer.setScreenOnWhilePlaying(true);
                mMediaPlayer.setDataSource(pathList.get(currentPosition));
                mMediaPlayer.setDisplay(holder);
                mMediaPlayer.prepare();
                mMediaPlayer.setOnBufferingUpdateListener(this);
                mMediaPlayer.setOnCompletionListener(this);
                mMediaPlayer.setOnPreparedListener(this);
                mMediaPlayer.setOnVideoSizeChangedListener(this);
                mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

            } catch (Exception e) {
                Log.e(TAG, "error: " + e.getMessage(), e);
            }
        }
    }

    public void onBufferingUpdate(MediaPlayer arg0, int percent) {
        Log.d(TAG, "onBufferingUpdate percent:" + percent);

    }

    public void onCompletion(MediaPlayer arg0) {
        if (currentPosition >= videoQueueSize) {
            Toast.makeText(VideoViewActivity.this, "Video Playback finished", Toast.LENGTH_LONG).show();
            this.finish();
        } else {
            playVideo();
            currentPosition++;
        }
        Log.d(TAG, "onCompletion called");
    }

    public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
        Log.v(TAG, "onVideoSizeChanged called");
        if (width == 0 || height == 0) {
            Log.e(TAG, "invalid video width(" + width + ") or height(" + height + ")");
            return;
        }
        mIsVideoSizeKnown = true;
        mVideoWidth = width;
        mVideoHeight = height;
        if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
            startVideoPlayback();
        }
    }

    public void onPrepared(MediaPlayer mediaplayer) {
        Log.d(TAG, "onPrepared called");
        mIsVideoReadyToBePlayed = true;
        if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
            startVideoPlayback();
        }
    }

    public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k) {
        Log.d(TAG, "surfaceChanged called");

    }

    public void surfaceDestroyed(SurfaceHolder surfaceholder) {
        Log.d(TAG, "surfaceDestroyed called");
    }

    public void surfaceCreated(SurfaceHolder holder) {
        Log.d(TAG, "surfaceCreated called");
        pathList = extras.getStringArrayList("Path");
        currentPosition = 0;
        videoQueueSize = pathList.size();
        if (!wl.isHeld()) {
            Log.d(TAG, "surfaceCreated - wl.acquire()");
            wl.acquire();
        }
        playVideo();
        Log.d(TAG, pathList.get(currentPosition));
        currentPosition++;

    }

    @Override
    protected void onPause() {
        super.onPause();
        releaseMediaPlayer();
        doCleanUp();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        releaseMediaPlayer();
        doCleanUp();
    }

    private void releaseMediaPlayer() {
        if (mMediaPlayer != null) {
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    private void doCleanUp() {
        mVideoWidth = 0;
        mVideoHeight = 0;
        mIsVideoReadyToBePlayed = false;
        mIsVideoSizeKnown = false;
        if (wl.isHeld()) {
            Log.d(TAG, "doCleanUp - wl.release()");
            wl.release();
        }
    }

    private void startVideoPlayback() {
        Log.v(TAG, "startVideoPlayback");
        holder.setFixedSize(mVideoWidth, mVideoHeight);
        mMediaPlayer.start();
    }
}

唤醒锁定命令是什么wron。我想知道的是，当wl.release被调用doCleanUp方法时，屏幕会亮起。

感谢您的帮助

Answer 1

请尝试以下代码段：

getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = powerManager.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK
            | PowerManager.ACQUIRE_CAUSES_WAKEUP, "WakeClock");

Android设备屏幕无法开启

1 个答案: