播放SDcard上面的音频文件

这个程序是将sdcard上的音频文件读取出来，将其路径放到ArrayList中，在添加到ListView中，然后通过MediaPlayer播放音频文件~~~

一如既往，有码有真相~~


 

package com.example.sdcardmusicplay;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {

private MediaPlayer mp;
private int currentItem=0;//记录当前播放的item
private ArrayList<String> list = new ArrayList<String>();
private Button b1, b2, b3, b4, b5;
private boolean isplay=false;//////记录是否在播放

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mp = new MediaPlayer();
b1 = (Button) findViewById(R.id.play);
b2 = (Button) findViewById(R.id.pause);
b3 = (Button) findViewById(R.id.stop);
b4 = (Button) findViewById(R.id.up);
b5 = (Button) findViewById(R.id.down);
b2.setEnabled(false);
b3.setEnabled(false);
audiolist();

b1.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
playMusic(list.get(currentItem));
b1.setEnabled(false);
b2.setText("暂停");
b3.setEnabled(true);
isplay = true;

MainActivity.this.setTitle("当前播放的是：" + list.get(currentItem));
}

});

b2.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

if (isplay) {
MainActivity.this.setTitle("当前播放的是："
+ list.get(currentItem));
mp.pause();
b1.setEnabled(false);
b2.setText("继续");
b3.setEnabled(true);
isplay = false;
} else {
mp.start();
b1.setEnabled(false);
b2.setText("暂停");
b3.setEnabled(true);
isplay = true;
MainActivity.this.setTitle("当前播放的是："
+ list.get(currentItem));

}
}

});

b3.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
mp.stop();
b1.setEnabled(true);
b2.setEnabled(false);
b3.setEnabled(false);
MainActivity.this.setTitle("");
}

});

b4.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
upOne();
MainActivity.this.setTitle("当前播放的是：" + list.get(currentItem));
isplay = true;
b1.setEnabled(false);
b2.setEnabled(true);
b2.setText("暂停");
b3.setEnabled(true);
}

});

b5.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
nextOne();
isplay = true;
b1.setEnabled(false);
b2.setEnabled(true);
b2.setText("暂停");
b3.setEnabled(true);
MainActivity.this.setTitle("当前播放的是：" + list.get(currentItem));
}

});

mp.setOnCompletionListener(new OnCompletionListener() {

@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub

Toast.makeText(MainActivity.this, "播放完毕~~~", Toast.LENGTH_SHORT);

MainActivity.this.setTitle("");

}

});

}

public void audiolist() {/////////制作ListView

getFiles("/sdcard/");///////读取音频文件，将其添加到list中
ListView lv = (ListView) findViewById(R.id.list);

ArrayAdapter<String> aa = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, list);
lv.setAdapter(aa);

lv.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
currentItem = position;
playMusic(list.get(position));
MainActivity.this.setTitle("当前播放的是："+list.get(currentItem));
}

});

}

public void playMusic(String path) {//根据path播放音频

mp.reset();
try {
mp.setDataSource(path);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

try {
mp.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mp.start();

b2.setEnabled(true);
b2.setText("暂停");

}

public void getFiles(String url){//查找获取音频文件，添加到list中

File files=new File(url);
File [] file=files.listFiles();
if(file!=null){//////////////////有可能是空目录，所以用来排除空目录

for(File f:file){/////////遍历file数组
if(f.isDirectory()){
getFiles(f.getAbsolutePath());///////递归调用

}else{
if(isAudioFile(f.getPath())){/////调用方法判断是不是音频文件

list.add(f.getPath());

}

}

}
}
}

public boolean isAudioFile(String path){
String []  formatt={"mp3","wav","3gp"};

for(String s:formatt){

if(path.contains(s)){

return true;

}

}

return false;
}

public void nextOne(){////下一首

if(++currentItem>=list.size()){

currentItem=0;

}

playMusic(list.get(currentItem));

}

public void upOne(){////上一首

if(--currentItem>=0){
if(currentItem>=list.size()){

currentItem=0;

}

}else{

currentItem=list.size()-1;

}

playMusic(list.get(currentItem));
}

protected void onDestroy() {// //////当程序退出时，释放资源
// TODO Auto-generated method stub
mp.release();

super.onDestroy();
}

}

 

布局文件源码

 

 

 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
>

<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:isScrollContainer="true"
android:layout_weight="1"

android:drawSelectorOnTop="false"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:layout_weight="6"
>
<Button
android:id="@+id/play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="播放"
/>
<Button
android:id="@+id/pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="暂停/继续"
/>

<Button
android:id="@+id/stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="停止"
/>

<Button
android:id="@+id/up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上一首"
/>

<Button
android:id="@+id/down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下一首"
/>

</LinearLayout>

</LinearLayout>

 

 

运行截图：