一添加监听器就异常，帮我看看吧，谢谢
程序是一个小播放器，当然还只完成不一部分。
先看MainActivity
package wangxin.Activity;import java.io.File;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import wangxin.file.FileUtils;import wangxin.mode.Mp3;import android.app.Activity;import android.app.AlertDialog;import android.app.ListActivity;import android.content.Context;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.SimpleAdapter;public class MainActivity extends Activity { public static final int NEWSONGMENU = 0; public static final int TOOLMENU = 5; public static final int ABOUTMENU = 10; private List<Mp3> mp3Files = null; public ListView listView = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); listView = (ListView) findViewById(R.id.listView); listView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub Mp3 mp3 = mp3Files.get(arg2); Intent intent = new Intent(); intent.putExtra("mp3Song", mp3); intent.setClass(MainActivity.this, PlayerActivity.class); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub menu.add(0, NEWSONGMENU, 0, "新歌"); menu.add(1, TOOLMENU, 5, "工具"); menu.add(3, ABOUTMENU, 10, "关于"); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case NEWSONGMENU: updateSongs(); break; case TOOLMENU: // 现在不实现 break; case ABOUTMENU: getAlertDialog(MainActivity.this, "关于", "本款小软件由mojia独立完成，灰常不错哦，鼓掌！", "好嘞"); break; default: break; } return super.onOptionsItemSelected(item); } private void updateSongs() { // TODO Auto-generated method stub FileUtils fileUtils = new FileUtils(); mp3Files = fileUtils.getMp3Files("mp3"); if (mp3Files != null) { ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>(); for (Iterator<Mp3> i = mp3Files.iterator(); i.hasNext();) { Mp3 mp3 = i.next(); HashMap<String, String> hashMap = new HashMap<String, String>(); hashMap.put("mp3Name", mp3.getName()); list.add(hashMap); } SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, list, R.layout.songslist, new String[] { "mp3Name" }, new int[] { R.id.mp3Name }); listView.setAdapter(adapter); } else { getAlertDialog(MainActivity.this, "Sorry", "对不起现在还没有歌曲哦,亲", "OK"); } } public void getAlertDialog(Context context, String title, String message, String str_ok) { // TODO Auto-generated method stub new AlertDialog.Builder(context).setTitle(title).setMessage(message) .setPositiveButton(str_ok, new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub finish(); } }).show(); }}
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <ListView android:id="@+id/listView" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout></LinearLayout>
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" > <TextView android:id="@+id/mp3Name" android:layout_width="300dip" android:layout_height="35dip" android:paddingBottom="1dip" android:paddingLeft="4dip" android:paddingTop="1dip" android:textSize="18dip" /></RelativeLayout>
package wangxin.Activity;import wangxin.mode.Mp3;import android.app.Activity;import android.app.ListActivity;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.Bundle;import android.os.IBinder;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageButton;import android.widget.Toast;public class PlayerActivity extends Activity { private ImageButton startButton = null; private ImageButton stopButton = null; private MediaPlayer mediaPlayer = null; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.player); Intent intent = getIntent(); Mp3 mp3 = (Mp3) intent.getSerializableExtra("mp3Song"); startButton = (ImageButton) findViewById(R.drawable.start); startButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Toast.makeText(PlayerActivity.this, "要命啊", Toast.LENGTH_SHORT) .show(); } }); stopButton = (ImageButton) findViewById(R.drawable.stop); }}<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" android:gravity="center_horizontal" android:paddingTop="30dip" > <ImageButton android:id="@+id/startButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/start" /> <ImageButton android:id="@+id/stopButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/stop" android:layout_toRightOf="@+id/startButton" /></RelativeLayout>