android 遍历根目录获取音乐文件从听筒播放 延迟播放

客户要求做一个工厂模式的测试音乐播放器 

要求使用mediaplayer 从听筒播放

音乐文件遍历手机根目录获取存放在一个listview

下面放上代码

mainactivity：

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

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

public class MainActivity extends Activity {
    private MediaPlayer mPlayer;
    private AudioManager mAudioManager;
    private ListView lvFiles;
    private List<File> mFiles;
    private int mIndex = 0;
    private Handler mHander;

    private final Runnable mRunnable = new Runnable() {
        @Override
        public void run() {
            play();
        }

    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (mHander == null) {
            mHander = new Handler();
        }
        lvFiles = (ListView) findViewById(R.id.lv_data);
        mAudioManager = (AudioManager) this.getSystemService(AUDIO_SERVICE);
        mAudioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL,
                mAudioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL),
                AudioManager.FLAG_PLAY_SOUND);
        setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);


        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
        } else {
            Toast.makeText(this, "没有SD卡", Toast.LENGTH_LONG).show();
        }

        mFiles = new ArrayList<File>();
        File file = Environment.getExternalStorageDirectory().getAbsoluteFile();
        getAllFiles(file);

        lvFiles.setAdapter(new ArrayAdapter<File>(this, android.R.layout.simple_list_item_1, mFiles));
        lvFiles.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
                if (mPlayer != null && mPlayer.isPlaying()) {
                    mPlayer.stop();
                    mPlayer.release();
                    mPlayer = null;
                }
                mIndex = arg2;
                mHander.postDelayed(mRunnable,5000);
            }
        });
    }

    protected void onPause() {
        super.onPause();
        if (mPlayer != null)
            mPlayer.stop();
    }

    protected void onDestroy() {
        if (mPlayer != null) {
            mPlayer.stop();
        }
        mAudioManager.setMode(AudioManager.MODE_NORMAL);
        super.onDestroy();
    }


    private void getAllFiles(File root) {
        File files[] = root.listFiles();
        if (files != null) {
            for (File f : files) {
                if (f.isDirectory()) {
                    // getAllFiles(f);
                } else {
                    if (f.getAbsolutePath().contains(".wav")) {
                        mFiles.add(f);
                    }else if (f.getAbsolutePath().contains(".ogg")){
                        mFiles.add(f);
                    }else if (f.getAbsolutePath().contains(".mp3")){
                        mFiles.add(f);
                    }
                }
            }
        }
    }


    private void play() {
        mPlayer = new MediaPlayer();
        mPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);
        String fileName = "file://" + mFiles.get(mIndex).getAbsolutePath();
        try {
            mPlayer.setDataSource(String.valueOf(Uri.parse(fileName)));
            mPlayer.setLooping(true);
            mPlayer.prepare();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        mPlayer.start();
    }

}

AndroidManifest.xml



<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.fileexpolrer"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="19"
        android:targetSdkVersion="21" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
    </uses-permission>
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" >
    </uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.fileexpolrer"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="19"
        android:targetSdkVersion="21" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
    </uses-permission>
    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" >
    </uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>