我的应用程序遇到了问题,我想要做的是当我点击exp列表的孩子时它会播放歌曲。 很明显,当开始播放第一首歌但停止后,我再次播放它在我的logcat中显示错误。 我不知道如何解决这个问题。 请帮忙......
这是我的代码:
public class BacktrackActivity extends Activity {
MediaPlayer mp;
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
Context context;
public ImageButton stop;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.backtrack);
// final int[] blues = {R.raw.satch_boogie, R.raw.satch_boogie};
mp = MediaPlayer.create(this, R.raw.satch_boogie);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.genre_list);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this,listDataHeader,listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
stop = (ImageButton) findViewById(R.id.imageButton1);
stop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
mp.stop();
mp.reset();
}
});
expListView.setOnGroupClickListener(new OnGroupClickListener() {
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition,
long id) {
// TODO Auto-generated method stub
return false;
}
});
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getApplicationContext(), "Choose your " +
listDataHeader.get(groupPosition) + " Backtrack",
Toast.LENGTH_SHORT).show();
}
});
// Listview on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
mp.start();
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("Blues");
listDataHeader.add("Jazz");
listDataHeader.add("Rock");
listDataHeader.add("RnB");
// Adding child data
List<String> Blues = new ArrayList<String>();
Blues.add("The Shawshank Redemption");
Blues.add("The Godfather");
Blues.add("The Godfather: Part II");
Blues.add("Pulp Fiction");
Blues.add("The Good, the Bad and the Ugly");
Blues.add("The Dark Knight");
Blues.add("12 Angry Men");
List<String> Jazz = new ArrayList<String>();
Jazz.add("The Conjuring");
Jazz.add("Despicable Me 2");
Jazz.add("Turbo");
Jazz.add("Grown Ups 2");
Jazz.add("Red 2");
Jazz.add("The Wolverine");
List<String> Rock = new ArrayList<String>();
Rock.add("2 Guns");
Rock.add("The Smurfs 2");
Rock.add("The Spectacular Now");
Rock.add("The Canyons");
Rock.add("Europa Report");
List<String> RnB = new ArrayList<String>();
RnB.add("2 Guns");
RnB.add("The Smurfs 2");
RnB.add("The Spectacular Now");
RnB.add("The Canyons");
RnB.add("Europa Report");
listDataChild.put(listDataHeader.get(0), Blues); // Header, Child data
listDataChild.put(listDataHeader.get(1), Jazz);
listDataChild.put(listDataHeader.get(2), Rock);
listDataChild.put(listDataHeader.get(3), RnB);
}
}
这是我的logcat错误
12-04 08:52:54.317:W / Trace(1413):来自nativeGetEnabledTags的意外值:0 12-04 08:52:54.336:E / MediaPlayer(1413):在状态1中调用 12-04 08:52:54.336:E / MediaPlayer(1413):错误(-38,0) 12-04 08:52:54.356:W / Trace(1413):来自nativeGetEnabledTags的意外值:0 12-04 08:52:54.356:W / Trace(1413):来自nativeGetEnabledTags的意外值:0 12-04 08:52:54.416:W / Trace(1413):来自nativeGetEnabledTags的意外值:0 12-04 08:52:54.416:W / Trace(1413):来自nativeGetEnabledTags的意外值:0 12-04 08:52:54.466:E / MediaPlayer(1413):错误(-38,0)
答案 0 :(得分:1)
通常在start()
完成之前尝试调用prepare()
时会发生此类错误。
在调用mp.start()之前;你应该确保你已经设置了setDataSource()
并且prepare()已经完成
在您的代码中点击停止,您已经重置了媒体。在再次调用mp.start()之前,您应该至少再次setDataSource()
。
恕我直言,它是第一次工作,因为您已在MediaPlayer.create(this, R.raw.satch_boogie);
方法中设置了数据源(onCreate()
),并且在您单击listView子项时有足够的时间来准备它。
MediaPlayer.create(this, R.raw.satch_boogie);
)