音乐播放

1.扫描sdcard的mp3文件，点击能够播放

2. 扫描到文件显示在listview中

<1> 配置文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="myapplication.com.sdmp3">

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="23" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<2> 布局文件

 <ListView
        android:id="@+id/mListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

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

    <TextView
        android:id="@+id/tv_file"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:textColor="#000000"
        android:gravity="center_vertical"
        android:text="" />

    <TextView
        android:id="@+id/tc_fileName"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:textColor="#000000"
         />
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#ff0000"/>

</LinearLayout>

<3> .adapter

package myapplication.com.sdmp3;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;
import java.util.zip.Inflater;

/**
 * Created by Administrator on 2016/10/11.
 */
public class adapter extends BaseAdapter {
    Context context;
    List<MuiDao> datas;

    public adapter(Context context, List<MuiDao> datas) {
        this.context = context;
        this.datas = datas;
    }

    @Override
    public int getCount() {
        return datas.size();
    }

    @Override
    public Object getItem(int position) {
        return datas.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder=null;
        if(convertView==null){
            convertView = View.inflate(context, R.layout.sd_list, null);
            holder = new ViewHolder();
            holder.textView1 = (TextView) convertView.findViewById(R.id.tv_file);
            holder.textView2 = (TextView) convertView.findViewById(R.id.tc_fileName);
            convertView.setTag(holder);
        }

        else{
        holder= (ViewHolder) convertView.getTag();
        }
        MuiDao bean=datas.get(position);
        String str=bean.getAddress();
        String name1[]=str.split("-");
        holder.textView1.setText(name1[0]);

        holder.textView2.setText(bean.getAddress());
        return convertView;
    }
    class ViewHolder{
        TextView textView1,textView2;
    }
}

　　.bean

package myapplication.com.sdmp3;

/**
 * Created by Administrator on 2016/10/11.
 */
public class MuiDao {
    public String name;
    public String address;

    public MuiDao(String address, String name) {
        this.address = address;
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

　　.MainActivity

package myapplication.com.sdmp3;

import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

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

public class MainActivity extends AppCompatActivity {
    private ListView mListView;
    private ArrayList name;
    List<MuiDao> datas;
    String address;
    MediaPlayer player;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mListView = (ListView) findViewById(R.id.mListView);
        name = new ArrayList();
        player = new MediaPlayer();

        datas=new ArrayList<>();
        address=Environment.getExternalStorageDirectory()+"";

        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            File path = Environment.getExternalStorageDirectory(); // 获得SD卡路径
            File[] files = path.listFiles();// 读取
            getFileName(files);
        }

//        SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, name,
//                R.layout.sd_list, new String[] { "Name" },
//                new int[] { R.id.tc_fileName });
        adapter adapter1=new adapter(getApplicationContext(),datas);
        mListView.setAdapter(adapter1);
        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                MuiDao bean  = (MuiDao) parent.getItemAtPosition(position);
                String path=bean.getName();
                player.stop();

                Toast.makeText(MainActivity.this,path,Toast.LENGTH_SHORT).show();
                try {
                    player=new MediaPlayer();
                    player.setDataSource(path);
                    player.prepare();
                    player.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }


            }
        });
    }

    private void getFileName(File[] files) {
        if (files != null)// 先判断目录是否为空，否则会报空指针
        {
            for (File file : files) {
                if (file.isDirectory()) {
                    getFileName(file.listFiles());

                } else {
                    String fileName = file.getName();
                    if (fileName.endsWith(".mp3")) {
                      address=file.getAbsolutePath();
                        HashMap map = new HashMap();
                        String s = fileName.substring(0,
                                fileName.lastIndexOf("."));
                        System.out.println("***"+address);
                       datas.add(new MuiDao(fileName.substring(0,fileName.lastIndexOf(".")),address));
                        map.put("Name", fileName.substring(0,fileName.lastIndexOf(".")));
                        name.add(map);
                    }
                }
            }
        }
    }

}

后面呢：

<1>. 播放进度条实现

<2>. 断点播放

<3>.播放完毕自动顺序的播放

<4>.播放模式的实现

<5>.数据库的加入，避免扫描浪费时间