Android MediaPlayer问题：“Error（-38，0）”和“stop in state called 1”
我的设备甚至是仿真器都没有声音。
实际上，在“mMediaPlayer.create（this，musicIds [0]）”这一行中 ，eclipse给了我两个select： “使用'MediaPlayer'（声明types）”或“Add @SuppressWarnings'static-access'到Create（）“ 。 顺便说一下，我采取了日食的build议……..但仍然没有工作。
PS我从其他项目（寻呼机）调用一个包。
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setTitle(R.string.diff_title); setContentView(R.layout.title_layout); viewFlow = (ViewFlow) findViewById(R.id.viewflow); DiffAdapter adapter = new DiffAdapter(this); viewFlow.setAdapter(adapter); TitleFlowIndicator indicator = (TitleFlowIndicator) findViewById(R.id.viewflowindic); indicator.setTitleProvider(adapter); viewFlow.setFlowIndicator(indicator); //Set all views listView = (ListView) findViewById(R.id.listView1); listView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listeStrings)); final ImageView imv=(ImageView)findViewById(R.id.imv); imv.setImageResource(imageIds[0]); final ImageView pic = (ImageView)findViewById(R.id.Picture); pic.setImageResource(imageIds[0]); btnPlay = (ImageButton)findViewById(R.id.btnplay); btnPlay.setOnClickListener(this); btnNext = (ImageView)findViewById(R.id.imvnext); btnLast = (ImageView)findViewById(R.id.imvlast); final TextView textview = (TextView)findViewById(R.id.textView2); textview.setText(listeStrings[0]); seekBar = (SeekBar)findViewById(R.id.seekbar); //seekBar.setMax(mMediaPlayer.getDuration()); mMediaPlayer.create(this, musicIds[0]); try { if (mMediaPlayer != null) { mMediaPlayer.stop(); } mMediaPlayer.prepare(); mMediaPlayer.start(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } listView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View view, int position, long id) { int songIndex = position; String songTitle=musicNames[position]; imv.setImageResource(imageIds[position]); pic.setImageResource(imageIds[position]); textview.setText(listeStrings[position]); } }); } } 这是我的logcat：
08-11 07:33:19.217: E/MediaPlayer(338): stop called in state 1 08-11 07:33:19.217: E/MediaPlayer(338): error (-38, 0) 08-11 07:33:19.217: E/MediaPlayer(338): prepareAsync called in state 0 08-11 07:33:19.217: W/System.err(338): java.lang.IllegalStateException 08-11 07:33:19.227: W/System.err(338): at android.media.MediaPlayer.prepare(Native Method) 08-11 07:33:19.227: W/System.err(338): at org.taptwo.android.widget.viewflow.example.DiffViewFlowExample.onCreate(DiffViewFlowExample.java:95) 08-11 07:33:19.227: W/System.err(338): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 08-11 07:33:19.227: W/System.err(338): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 08-11 07:33:19.227: W/System.err(338): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 08-11 07:33:19.227: W/System.err(338): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 08-11 07:33:19.227: W/System.err(338): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 08-11 07:33:19.227: W/System.err(338): at android.os.Handler.dispatchMessage(Handler.java:99) 08-11 07:33:19.227: W/System.err(338): at android.os.Looper.loop(Looper.java:123) 08-11 07:33:19.227: W/System.err(338): at android.app.ActivityThread.main(ActivityThread.java:3683) 08-11 07:33:19.227: W/System.err(338): at java.lang.reflect.Method.invokeNative(Native Method) 08-11 07:33:19.227: W/System.err(338): at java.lang.reflect.Method.invoke(Method.java:507) 08-11 07:33:19.227: W/System.err(338): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 08-11 07:33:19.227: W/System.err(338): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 08-11 07:33:19.227: W/System.err(338): at dalvik.system.NativeStart.main(Native Method)<br> 08-11 07:33:19.257: E/MediaPlayer(338): Error (-38,0)
在prepare()之前，你需要先调用setDataSource(..) 。
媒体框架是一个非常严格的状态机 ，处理所有不同的状态真的很麻烦。
我用这个小包装 ，使编码/debugging更容易一些。 你可以试试看。
关于模拟器 – 请注意，并非所有文件格式都支持。
