首先展示代码结构图
首先在res里建立raw文件用来存放音频文件 这里注意如果写代码过程中发现raw文件引用不到 就build-clear project 一下
编写main-xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btn_main_play"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="播放" />
<Button
android:id="@+id/btn_main_pause"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="暂停" />
<Button
android:id="@+id/btn_main_stop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="停止" />
<Button
android:id="@+id/btn_main_exit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="退出" />
</LinearLayout>
main-activity 代码
import android.content.Intent;
import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button btn_main_play;
Button btn_main_pause;
Button btn_main_stop;
Button btn_main_exit;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_main_play = findViewById(R.id.btn_main_play);
btn_main_pause = findViewById(R.id.btn_main_pause);
btn_main_stop = findViewById(R.id.btn_main_stop);
btn_main_exit = findViewById(R.id.btn_main_exit);
btn_main_play.setOnClickListener(this);
btn_main_pause.setOnClickListener(this);
btn_main_stop.setOnClickListener(this);
btn_main_exit.setOnClickListener(this);
}
@Override
public void onClick(View view) {
Intent intent = new Intent(this, MusicService.class);
switch (view.getId()) {
case R.id.btn_main_play:
intent.putExtra("action", "play");
startService(intent);
break;
case R.id.btn_main_pause:
intent.putExtra("action", "pause");
startService(intent);
break;
case R.id.btn_main_stop:
intent.putExtra("action", "stop");
startService(intent);
break;
case R.id.btn_main_exit:
//关闭服务 结束activity
stopService(intent);
finish();
break;
}
}
}
新建MusicService 继承Service
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
public class MusicService extends Service {
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String action = intent.getStringExtra("action");
switch (action) {
case "play":
play();
break;
case "pause":
pause();
break;
case "stop":
stop();
break;
}
return super.onStartCommand(intent, flags, startId);
}
private MediaPlayer mp;
private void exit() {
stop();
}
private void stop() {
if (mp != null) {
mp.stop();//停止
mp.reset();//重置
mp.release();//释放资源
mp = null;
}
}
private void pause() {
if (mp != null && mp.isPlaying()) {
mp.pause();
}
}
private void play() {
if (mp == null) {
mp = MediaPlayer.create(this, R.raw.godv);
}
mp.start();
}
@Override
public void onDestroy() {
super.onDestroy();
stop();
}
}
注册服务AndroidManifest.xml
<service android:name="com.example.servicemusic.MusicService" />
最终能实现后台播放