Android 使用Service实现简易音乐播放器

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1. Service 部分

package com.jereh.learnbymyself.service;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.IBinder;import android.support.annotation.Nullable;import com.jereh.learnbymyself.R;/*** Created by Hh on 2017/1/22.*/public class MusicService extends Service {    @Nullable    @Override    public IBinder onBind(Intent intent) {        return null;    }    private MediaPlayer mediaPlayer;    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        if (intent != null) {            String action = intent.getStringExtra("action");            if (action.equals("play")) {                play();            }            if (action.equals("pause")) {                pause();            }            if (action.equals("stop")) {                stop();            }        }        return super.onStartCommand(intent, flags, startId);    }    private void play() {        if (mediaPlayer == null) {            mediaPlayer = MediaPlayer.create(this, R.raw.monster);        }        mediaPlayer.start();    }    private void pause() {        if (mediaPlayer.isPlaying()) {            mediaPlayer.pause();        }    }    private void stop() {        if (mediaPlayer != null) {            mediaPlayer.stop();            mediaPlayer.reset();            mediaPlayer.release();            mediaPlayer = null;        }    }    @Override    public void onDestroy() {        stop();        super.onDestroy();    }}

2. 界面部分

package com.jereh.learnbymyself.service;import android.content.Intent;import android.media.MediaPlayer;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import com.jereh.learnbymyself.R;public class MediaActivity extends AppCompatActivity implements View.OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_media);        findViewById(R.id.play).setOnClickListener(this);        findViewById(R.id.pause).setOnClickListener(this);        findViewById(R.id.stop).setOnClickListener(this);        findViewById(R.id.exit).setOnClickListener(this);    }    private MediaPlayer mediaPlayer;    @Override    public void onClick(View v) {        Intent intent = new Intent(this, MusicService.class);        switch (v.getId()) {            case R.id.play:                intent.putExtra("action", "play");                startService(intent);                break;            case R.id.pause:                intent.putExtra("action", "pause");                startService(intent);                break;            case R.id.stop:                intent.putExtra("action", "stop");                startService(intent);                break;            case R.id.exit:                intent.putExtra("action", "exit");                stopService(intent);                finish();                break;        }    }}

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