編輯：請注意此解決方案不能在4.x設備上工作 - 視頻根本不會出現，只有空白屏幕，我不能使它在那裏工作。
這裏有一個狀態機，執行以下操作：
1次短几秒鐘的視頻/res/raw/anim_mp4.mp4（程序中的onCreate（）方法來發起）的
2.如果用戶按下home鍵然後返回到程序時會尋求視頻開始位置和immediatelly暫停
package com.test.video;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.WindowManager;
public class MediaPlayerActivity extends Activity implements OnCompletionListener,
MediaPlayer.OnPreparedListener, MediaPlayer.OnSeekCompleteListener, SurfaceHolder.Callback {
private final int STATE_NOT_INITIALIZED = 0;
private final int STATE_INITIALIZING = 1;
private final int STATE_INITIALIZED = 2;
private final int STATE_SEEKING = 3;
private final int STATE_DELAYING = 4;
private final int STATE_PLAYING = 5;
private final int STATE_FINISHED = 6;
private final int STATE_RESUMED = 7;
private final int STATE_RESUMED_PREPARING = 8;
private final int STATE_RESUMED_PREPARED = 9;
private final int STATE_RESUMED_SEEKING = 10;
private int state = STATE_NOT_INITIALIZED;
private SurfaceView surface;
private MediaPlayer player;
private SurfaceHolder holder;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d(Constants.TAG, "onCreate()");
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.mediaplayer);
surface = (SurfaceView) findViewById(R.id.idSurface);
holder = surface.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
protected void onStart() {
Log.d(Constants.TAG, "onStart()");
super.onStart();
state();
}
@Override
protected void onResume() {
Log.d(Constants.TAG, "onResume()");
super.onResume();
if (STATE_FINISHED == state) {
state = STATE_RESUMED;
state();
}
}
@Override
protected void onDestroy() {
Log.d(Constants.TAG, "onDestroy()");
super.onDestroy();
if (player != null) {
player.release();
player = null;
}
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
Log.d(Constants.TAG, "surfaceChanged()");
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
Log.d(Constants.TAG, "surfaceCreated()");
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
Log.d(Constants.TAG, "surfaceDestroyed()");
}
@Override
public void onPrepared(MediaPlayer mp) {
Log.d(Constants.TAG, "onPrepared()");
state();
}
@Override
public void onCompletion(MediaPlayer mp) {
Log.d(Constants.TAG, "onCompletion()");
state();
}
@Override
public void onSeekComplete(MediaPlayer mediaplayer) {
Log.d(Constants.TAG, "onSeekComplete()");
state();
}
private class ResumeDelayed extends PlayDelayed {
protected void onPostExecute(Void result) {
Log.d(Constants.TAG, "ResumeDelayed.onPostExecute()");
state();
};
}
private void initPlayer() {
Log.d(Constants.TAG, "initPlayer()");
try {
if (player == null) {
player = new MediaPlayer();
player.setScreenOnWhilePlaying(true);
} else {
player.stop();
player.reset();
}
String uri = "android.resource://" + getPackageName() + "/" + R.raw.anim_mp4;
player.setDataSource(this, Uri.parse(uri));
player.setDisplay(holder);
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.setOnPreparedListener(this);
player.prepareAsync();
player.setOnCompletionListener(this);
player.setOnSeekCompleteListener(this);
} catch (Throwable t) {
Log.e(Constants.TAG, "Exception in media prep", t);
}
}
private class PlayDelayed extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... arg0) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Log.e(Constants.TAG, "Can't sleep", e);
}
return null;
}
protected void onPostExecute(Void result) {
Log.d(Constants.TAG, "PlayDelayed.onPostExecute()");
initPlayer();
};
}
private void state() {
switch (state) {
case STATE_NOT_INITIALIZED:
state = STATE_INITIALIZING;
initPlayer();
break;
case STATE_INITIALIZING:
state = STATE_INITIALIZED;
new PlayDelayed().execute();
break;
case STATE_INITIALIZED:
state = STATE_SEEKING;
player.start();
player.seekTo(0);
break;
case STATE_SEEKING:
state = STATE_DELAYING;
player.pause();
new ResumeDelayed().execute();
break;
case STATE_DELAYING:
state = STATE_PLAYING;
player.start();
break;
case STATE_PLAYING:
state = STATE_FINISHED;
break;
case STATE_RESUMED:
state = STATE_RESUMED_PREPARING;
initPlayer();
break;
case STATE_RESUMED_PREPARING:
state = STATE_RESUMED_PREPARED;
new PlayDelayed().execute();
break;
case STATE_RESUMED_PREPARED:
state = STATE_RESUMED_SEEKING;
player.start();
player.seekTo(0);
break;
case STATE_RESUMED_SEEKING:
state = STATE_FINISHED;
player.pause();
break;
default:
break;
}
}
mediaplayer.xml佈局（程序中的onResume（）方法來發起）：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/black" >
<SurfaceView
android:id="@+id/idSurface"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
AndroidManifest.xml中的樣子：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test.video"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<application
android:icon="@drawable/ic_launcher"
android:theme="@android:style/Theme.Black.NoTitleBar" >
<activity
android:name=".MediaPlayerActivity"
android:label="@string/app_name"
android:screenOrientation="portrait"
android:theme="@android:style/Theme.Black.NoTitleBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
你是否重寫了像onStop（）onResume（）這樣的生命週期方法？我會從那裏開始... – bgs 2011-06-14 18:53:21
我已經覆蓋了他們，你暗示我包含在重寫的方法中的代碼是什麼？ – 2011-06-14 20:17:08
聽起來像你在做正確的事。你在媒體播放器上使用reset（）嗎？除了確保你正確地調用start（），stop（），在正確的地方重新啓動等等，作爲最後的手段，我會附加android源代碼並在調試器中逐步完成。任何在logcat中？ – bgs 2011-06-15 04:57:50