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標題: 請問我的程式哪裡有錯啊? [打印本頁]

作者: polor22hen 時間: 2016-3-14 18:15
標題: 請問我的程式哪裡有錯啊?
哪裡有錯啊還是要加啥?因為網路上找到地所以想試試看可是Listview都跑不出東西，因為要做專題需要想使用看看這個希望大大能幫我看看哪裡錯
大大幫幫忙吧很急阿

Activity

package com.example.app;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import android.app.Activity;
import android.app.ProgressDialog;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;

public class MediaPlayerActivity extends Activity implements OnCompletionListener,OnErrorListener,OnSeekBarChangeListener,OnItemClickListener,Runnable{

protected static final int SEARCH_MUSIC_SUCCESS = 0;// 搜索成功标记
private SeekBar seekBar;
private ListView listView;
private ImageButton btnPlay;
private TextView tv_currTime,tv_totalTime,tv_showName;
private List<String> list;
private ProgressDialog pd; // 进度条对话框
private MusicListAdapter ma;// 适配器
private MediaPlayer mp;
private int currIndex = 0;// 表示当前播放的音乐索引
private boolean flag = true;//控制进度条线程标记

// 定义当前播放器的状态״̬
private static final int IDLE = 0;
private static final int PAUSE = 1;
private static final int START = 2;
private static final int CURR_TIME_VALUE = 1;

private int currState = IDLE; // 当前播放器的状态
//定义线程池（同时只能有一个线程运行）
ExecutorService es = Executors.newSingleThreadExecutor();

@Override
protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_media_player);
      list = new ArrayList<String>();
      mp = new MediaPlayer();
      mp.setOnCompletionListener(this);
      mp.setOnErrorListener(this);
      initView();
}

@Override
protected void onDestroy() {
      if (mp != null) {
         mp.stop();
         flag= false;
         //释放资源
         mp.release();
      }
      super.onDestroy();
}

/**
   * 初始化UI组件
   */
private void initView() {
      btnPlay = (ImageButton) findViewById(R.id.media_play);
      seekBar = (SeekBar) findViewById(R.id.seekBar1);
      seekBar.setOnSeekBarChangeListener(this);
      listView = (ListView) findViewById(R.id.listView1);
      listView.setOnItemClickListener(this);
      tv_currTime = (TextView) findViewById(R.id.textView1_curr_time);
      tv_totalTime = (TextView) findViewById(R.id.textView1_total_time);
      tv_showName = (TextView) findViewById(R.id.tv_showName);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
      //从xml文件中装载菜单
      getMenuInflater().inflate(R.menu.media_menu, menu);
      return super.onCreateOptionsMenu(menu);
}

private Handler hander = new Handler() {
      public void handleMessage(android.os.Message msg) {
         switch (msg.what) {
         case SEARCH_MUSIC_SUCCESS:
            //搜索音乐文件结束时
            ma = new MusicListAdapter();
            listView.setAdapter(ma);
            pd.dismiss();
            break;
         case CURR_TIME_VALUE:
            //设置当前时间
            tv_currTime.setText(msg.obj.toString());
            break;
         default:
            break;
         }
      };
};

@Override
public boolean onOptionsItemSelected(MenuItem item) {
      switch (item.getItemId()) {
      //搜索本地音乐菜单
      case R.id.item1_search:
         list.clear();
         //是否有外部存储设备
         if (Environment.getExternalStorageState().equals(
                  Environment.MEDIA_MOUNTED)) {
            pd = ProgressDialog.show(this, "", "正在搜索音乐文件...", true);
            new Thread(new Runnable() {
                  String[] ext = { ".mp3" };
                  File file = Environment.getExternalStorageDirectory();

                  public void run() {
                     search(file, ext);
                     hander.sendEmptyMessage(SEARCH_MUSIC_SUCCESS);
                  }
            }).start();

         } else {
            Toast.makeText(this, "请插入外部存储设备..", Toast.LENGTH_LONG).show();
         }

         break;
      //清除播放列表菜单
      case R.id.item2_clear:
         list.clear();
         ma.notifyDataSetChanged();
         break;
      //退出菜单
      case R.id.item3_exit:
         flag = false;
         this.finish();
         break;
      }
      return super.onOptionsItemSelected(item);
}

// 搜索音乐文件
private void search(File file, String[] ext) {
      if (file != null) {
         if (file.isDirectory()) {
            File[] listFile = file.listFiles();
            if (listFile != null) {
                  for (int i = 0; i < listFile.length; i++) {
                     search(listFile[i], ext);
                  }
            }
         } else {
            String filename = file.getAbsolutePath();
            for (int i = 0; i < ext.length; i++) {
                  if (filename.endsWith(ext[i])) {
                     list.add(filename);
                     break;
                  }
            }
         }
      }
}

class MusicListAdapter extends BaseAdapter {

      public int getCount() {
         return list.size();
      }

      public Object getItem(int position) {
         return list.get(position);
      }

      public long getItemId(int position) {
         return position;
      }

      public View getView(int position, View convertView, ViewGroup parent) {
         if (convertView == null) {
            convertView = getLayoutInflater().inflate(R.layout.list_item,
                     null);
         }
         TextView tv_music_name = (TextView) convertView
                  .findViewById(R.id.textView1_music_name);
         tv_music_name.setText(list.get(position));
         return convertView;
      }

}

private void play() {
      switch (currState) {
      case IDLE:
         start();
         break;
      case PAUSE:
         mp.pause();
         btnPlay.setImageResource(R.drawable.ic_launcher);
         currState = START;
         break;
      case START:
         mp.start();
         btnPlay.setImageResource(R.drawable.ic_launcher);
         currState = PAUSE;
      }
}

//上一首
private void previous() {
      if((currIndex-1)>=0){
         currIndex--;
         start();
      }else{
         Toast.makeText(this, "当前已经是第一首歌曲了", Toast.LENGTH_SHORT).show();
      }
}

//下一自首
private void next() {
      if(currIndex+1<list.size()){
         currIndex++;
         start();
      }else{
         Toast.makeText(this, "当前已经是最后一首歌曲了", Toast.LENGTH_SHORT).show();
      }
}

//开始播放
private void start() {
      if (list.size() > 0 && currIndex < list.size()) {
         String SongPath = list.get(currIndex);
         mp.reset();
         try {
            mp.setDataSource(SongPath);
            mp.prepare();
            mp.start();
            initSeekBar();
            es.execute(this);
            tv_showName.setText(list.get(currIndex));
            btnPlay.setImageResource(R.drawable.ic_launcher);
            currState = PAUSE;
         } catch (IOException e) {
            e.printStackTrace();
         }
      }else{
         Toast.makeText(this, "播放列表为空", Toast.LENGTH_SHORT).show();
      }
}

//播放按钮
public void play(View v){
      play();
}

//上一首按钮
public void previous(View v){
      previous();
}

//下一首按钮
public void next(View v){
      next();
}

//监听器，当当前歌曲播放完时触发，播放下一首
public void onCompletion(MediaPlayer mp) {
      if(list.size()>0){
         next();
      }else{
         Toast.makeText(this, "播放列表为空", Toast.LENGTH_SHORT).show();
      }
}

//当播放异常时触发
public boolean onError(MediaPlayer mp, int what, int extra) {
      mp.reset();
      return false;
}

//初始化SeekBar
private void initSeekBar(){
      seekBar.setMax(mp.getDuration());
      seekBar.setProgress(0);
      tv_totalTime.setText(toTime(mp.getDuration()));
}

private String toTime(int time){
      int minute = time / 1000 / 60;
      int s = time / 1000 % 60;
      String mm = null;
      String ss = null;
      if(minute<10)mm = "0" + minute;
      else mm = minute + "";

      if(s <10)ss = "0" + s;
      else ss = "" + s;

      return mm + ":" + ss;
}

public void run() {
      flag = true;
      while(flag){
         if(mp.getCurrentPosition()<seekBar.getMax()){
            seekBar.setProgress(mp.getCurrentPosition());
            Message msg = hander.obtainMessage(CURR_TIME_VALUE, toTime(mp.getCurrentPosition()));
            hander.sendMessage(msg);
            try {
                  Thread.sleep(500);
            } catch (InterruptedException e) {
                  e.printStackTrace();
            }
         }else{
            flag = false;
         }
      }
}

//SeekBar监听器
public void onProgressChanged(SeekBar seekBar, int progress,
         boolean fromUser) {
      //是否由用户改变
      if(fromUser){
         mp.seekTo(progress);
      }
}

public void onStartTrackingTouch(SeekBar seekBar) {
}

public void onStopTrackingTouch(SeekBar seekBar) {
}

//ListView监听器
public void onItemClick(AdapterView<?> parent, View view, int position,
         long id) {
      currIndex = position;
      start();
}
}

XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >

<ListView
      android:id="@+id/listView1"
      android:layout_width="match_parent"
      android:layout_height="324dp" >

</ListView>

<TextView
      android:id="@+id/tv_showName"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:gravity="center" />

<LinearLayout
      android:id="@+id/linearLayout2"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:gravity="center" >

      <TextView
         android:id="@+id/textView1_curr_time"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginRight="5dp"
         android:text="00:00" />

      <SeekBar
         android:id="@+id/seekBar1"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_weight="1" />

      <TextView
         android:id="@+id/textView1_total_time"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginLeft="5dp"
         android:text="00:00" />
</LinearLayout>

<LinearLayout
      android:id="@+id/linearLayout1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:gravity="center" >

      <ImageButton
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:onClick="previous"
         android:src="@android:drawable/ic_media_previous" />

      <ImageButton
         android:id="@+id/media_play"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:onClick="play"
         android:src="@android:drawable/ic_media_play" />

      <ImageButton
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:onClick="next"
         android:src="@android:drawable/ic_media_next" />
</LinearLayout>

</LinearLayout>

作者: ploglin 時間: 2016-3-15 09:38
你貼的程式碼太長了，一般大家不會去一行一行的看有什麼問題。
建議你，先單純試試 ListView ，有資料出來後，再去挷你要捉的檔案。
一般 ListView 的 Adpater 有 2 種，ArrayAdapter 跟 SimpleAdapter，因為你的 ListView 我看只有一個 TextView，建議你可以先試 ArrayAdapter 來試試唷。

作者: whl 時間: 2016-3-19 06:53
Listview 沒看到哪裡有設 adapter？

作者: 張小舜 時間: 2016-3-22 21:28
錯誤訊息?

作者: andy08691 時間: 2016-5-3 16:48
建議你可以把listview裡的layout配置在用另一個xml去寫
比較可以客製化
建議把錯誤代碼貼上來
要不然程式碼太長了
http://huli.logdown.com/posts/280137-android-custom-listview
這篇寫的蠻清楚的可以參考

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