Android-bindService本地服务-音乐播放-上

播放音乐的行为写在服务里，Activity去调用Service里面到方法，进行音乐播放，当Activity结束后，音乐播放器停止播放

界面：

MainActivity：

package liudeli.service1;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Environment;
import android.os.IBinder;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import liudeli.service1.service.MyService5;
import liudeli.service1.service.inter.IMusicPlay;

public class MainActivity5 extends Activity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main5);

        initView();
        initListener();
    }

    @Override
    protected void onStart() {
        super.onStart();
        // 绑定服务
        bindService(new Intent(this, MyService5.class), connection, BIND_AUTO_CREATE);
    }

    private Button btPlayMusic;
    private Button btPausedContinue;
    private Button btStop;

    private void initView() {
        btPlayMusic = findViewById(R.id.bt_play_music);
        btPausedContinue = findViewById(R.id.bt_paused_continue);
        btStop = findViewById(R.id.bt_stop);
    }

    private void initListener() {
        btPlayMusic.setOnClickListener(this);
        btPausedContinue.setOnClickListener(this);
        btStop.setOnClickListener(this);
    }

    private IMusicPlay iMusicPlay;

    private ServiceConnection connection = new ServiceConnection() {
        /**
         * 连接到服务
         * @param name
         * @param service
         */
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            iMusicPlay = (IMusicPlay) service;
        }

        /**
         * 断开连接
         * @param name
         */
        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
    };

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 解绑服务：注意bindService后 必须要解绑服务，否则会报 连接资源异常
        if (null != connection) {
            unbindService(connection);
        }
    }

    // 音乐文件到路径
    private final String MUSIC_PATH = Environment.getExternalStorageDirectory() + "/cjyy.mp3";

    @Override
    public void onClick(View v) {

        if (iMusicPlay == null) {
            Toast.makeText(this, "音乐播放服务连接失败", Toast.LENGTH_LONG).show();
            return;
        }

        switch (v.getId()) {

            case R.id.bt_play_music:
                iMusicPlay.playMusic(MUSIC_PATH);
                break;

            case R.id.bt_paused_continue:
                if ("暂停播放".equals(btPausedContinue.getText().toString())) {
                    btPausedContinue.setText("继续播放");
                    iMusicPlay.pausedPlay();
                } else {
                    btPausedContinue.setText("暂停播放");
                    iMusicPlay.continuePlay();
                }
                break;

            case R.id.bt_stop:
                iMusicPlay.stopPlay();
                break;

            default:
                break;
        }
    }
}

增强版Binder扩展，接口定义：

package liudeli.service1.service.inter;

public interface IMusicPlay {

    /**
     * 播放音乐
     * @param musicPath 音乐文件的路径
     */
    void playMusic(String musicPath);

    /**
     * 暂停播放
     */
    void pausedPlay();

    /**
     * 继续播放
     */
    void continuePlay();

    /**
     * 停止播放
     */
    void stopPlay();
}

Service代码：

package liudeli.service1.service;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

import java.io.IOException;

import liudeli.service1.service.inter.IMusicPlay;

public class MyService5 extends Service {

    private final String TAG = MyService5.class.getSimpleName();

    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "绑定成功");
        return new PlayMusicBinder();
    }

    private MediaPlayer mediaPlayer;

    /**
     * 增强版Binder，扩展出播放音乐