Question

如果活动在后台，我正在制作简单的应用程序来显示视频和播放音频播放如果我只是关闭/打开屏幕，我的应用程序工作正常当我在追击另一个应用程序后恢复我的应用程序时崩溃了。 Log cat显示没有错误。

import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import com.squareup.otto.Subscribe;

public class MainActivity
        extends Activity
        implements android.view.SurfaceHolder.Callback {

    private SurfaceView   surfaceViewFrame;
    private SurfaceHolder holder;
    private Bundle        extras;
    private static final String  TAG = "log_tag";
    private              boolean b   = false;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        surfaceViewFrame = (SurfaceView) findViewById(R.id.surfaceView);
        surfaceViewFrame.setClickable(false);

        holder = surfaceViewFrame.getHolder();
        holder.addCallback(this);


    }


    @Subscribe
    public void attachPlayer(MediaPlayer player) {
        player.setDisplay(holder);

    }


    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }


    public void surfaceCreated(SurfaceHolder holder) {
        startService(new Intent(this, MediaPlayerService.class));

    }


    public void surfaceDestroyed(SurfaceHolder holder) {

    }


    @Override
    protected void onStart() {
        super.onStart();
        BusProvider.getInstance().register(this);
    }


    @Override
    protected void onStop() {
        super.onStop();
        BusProvider.getInstance().unregister(this);
    }

服务

import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.IBinder;
import android.util.Log;

import java.io.IOException;

public class MediaPlayerService
        extends Service
        implements MediaPlayer.OnPreparedListener,
                   MediaPlayer.OnCompletionListener,

                   MediaPlayer.OnSeekCompleteListener {

    private static final String TAG = "MediaService";

    private static final String ACTION_PLAY = "com.example.action.PLAY";
    private MediaPlayer player;
    public String[]
            video_path =
            {"https://ellovidsout.s3.amazonaws.com/1265/9/1422967594.mp4.m3u8", "https://ellovidsout.s3.amazonaws.com/1260/9/1422887544.mp4.m3u8"};


    @Override
    public void onCreate() {
        super.onCreate();
        player = new MediaPlayer();
        player.setOnPreparedListener(this);
        player.setOnCompletionListener(this);

        player.setOnSeekCompleteListener(this);
        player.setScreenOnWhilePlaying(true);

    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {


        playVideo();

        Notification note = new Notification(
                R.drawable.ic_launcher, "Can you hear the music?", System.currentTimeMillis()
        );
        Intent i = new Intent(this, MediaPlayerService.class);
        i.setFlags(
                Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP
        );
        PendingIntent pi = PendingIntent.getActivity(
                this, 0, i, 0
        );
        note.setLatestEventInfo(
                this, "Fake Player", "Now Playing: \"Ummmm, Nothing\"", pi
        );
        note.flags |= Notification.FLAG_NO_CLEAR;
        startForeground(1337, note);
        return super.onStartCommand(intent, flags, startId);
    }


    @Override
    public IBinder onBind(Intent intent) {

        return null;
    }


    @Override
    public void onDestroy() {
        super.onDestroy();
        player.stop();
        player.release();
        player = null;
    }


    private Thread playback = new Thread(
            new Runnable() {

                public void run() {
                    try {

                        try {
                            player.setDataSource(
                                    MediaPlayerService.this, Uri.parse(
                                            video_path[0]
                                    )
                            );
                            player.prepareAsync();
                        } catch (IOException e) {
                            Log.e(TAG, "Error while playing video: " + e.getMessage());
                        }

                    } catch (IllegalArgumentException e) {
                        Log.e(TAG, "Error while playing video: " + e.getMessage());
                    }
                }
            }
    );


    private void playVideo() {
        if (player!=null&&!playback.isAlive()) playback.start();
    }


    public void onPrepared(MediaPlayer mp) {
        if (!player.isPlaying()) {
            player.start();
            BusProvider.getInstance()
                    .post(player);
        }

    }


    public void onCompletion(MediaPlayer mp) {
        try {
            player.setDataSource(
                    MediaPlayerService.this, Uri.parse(
                            video_path[0]
                    )
            );
        } catch (IOException e) {
            Log.e(TAG, "Error while playing video: " + e.getMessage());

        }
        player.prepareAsync();

    }


    public void onSeekComplete(MediaPlayer mp) {

    }
}

Answer 1

你错过了onStop：

@Override protected void onStop() { holder.removeCallback(this); super.onStop(); }
请添加崩溃报告

恢复后应用程序崩溃，没有异常

1 个答案: