用Service让模拟器为我们放首歌
有两个界面A和B
界面A—游戏设置界面
界面B—系统设置界面
两个界面都可以控制歌曲的播放
既然都是相同的界面和工能，那我们建一个baseActivity来减少重复的代码吧。
public abstract class BaseActivity extends Activity {
private String tag = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.baseactivity);
tag = getClass().getSimpleName();
initView();// 初始化view
initData();// 初始化数据
}
public abstract void initData();
public abstract void initView();
public void play(View view) {
Log.v(tag, "play");
Intent intent = new Intent(this, MusicService.class);
intent.putExtra(MusicService.CMD, MusicService.MUSIC_PLAY);
startService(intent);
/* MusicService musicService=new MusicService();
musicService.show();//调用service自己写的里面的show方法
*/ }
public void pause(View view) {
Log.v(tag, "pause");
Intent intent = new Intent(this, MusicService.class);
intent.putExtra(MusicService.CMD, MusicService.MUSIC_PAUSE);
startService(intent);
}
public void stopmusic(View view) {
Log.v(tag, "stopmusic");
Intent intent = new Intent(this, MusicService.class);
intent.putExtra(MusicService.CMD, MusicService.MUSIC_SYOP);
startService(intent);
}
public void stopservice(View view) {
Log.v(tag, "stopservice");
Intent intent = new Intent(this, MusicService.class);
stopService(intent);
}
}baseActvity的布局文件如下
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.musicplayer.MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/text_tv"
android:layout_centerHorizontal="true"
android:onClick="play"
android:layout_marginTop="63dp"
android:text="播放" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="26dp"
android:onClick="pause"
android:text="暂停" />
<Button
android:id="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2"
android:layout_marginTop="23dp"
android:onClick="stopmusic"
android:text="停止音乐" />
<Button
android:id="@+id/button4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button3"
android:layout_below="@+id/button3"
android:layout_marginTop="28dp"
android:onClick="stopservice"
android:text="停止服务" />
<TextView
android:id="@+id/text_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="64dp"
android:text="界面" />
</RelativeLayout>我懒得写 就直接用个相对布局直接拖的。。。
然后建两个activity来继承baseactivity
public class GameAtivity extends BaseActivity {
@Override
public void initData() {
// TODO Auto-generated method stub
}
@Override
public void initView() {
// TODO Auto-generated method stub
TextView textView=(TextView) findViewById(R.id.text_tv);
textView.setText("游戏设置界面");
textView.setBackgroundColor(Color.BLUE);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.add("音乐设置");// 添加子菜单
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// 进入到settingActivity
Intent intent = new Intent(this, SettingActivity.class);
startActivity(intent);
return super.onOptionsItemSelected(item);
}
}这里加了一个optionmenu来跳转到SettingActivity
public class SettingActivity extends BaseActivity {
@Override
public void initData() {
// TODO Auto-generated method stub
}
@Override
public void initView() {
// TODO Auto-generated method stub
TextView textView=(TextView) findViewById(R.id.text_tv);
textView.setText("系统设置界面");
textView.setBackgroundColor(Color.RED);
}
}
还有最重要的服务代码
//服务端
public class MusicService extends Service {
private MediaPlayer player;
private static final String TAG = "MusicService";
public static String CMD = "cmd";
public static final int MUSIC_PLAY = 1;// 开始
public static final int MUSIC_PAUSE = 2;// 暂停
public static final int MUSIC_SYOP = 3;// 停止
// 全局服务
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
Log.v(TAG, "onCreat");
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
Log.v(TAG, "onStartCommand");
int cmd = intent.getIntExtra(CMD, 0);
// 在这里接受意图
switch (cmd) {
case MUSIC_PLAY:
if(player==null){
//音乐资源id 不是资产目录因为不能生成r文件 res/raw
player=MediaPlayer.create(getApplicationContext(), R.raw.cunzai);
//电影的播放，音乐，缓冲--读取的数据时间不同步,内存里读取数据与硬盘和sd卡不同。 而在资源文件中的不需要缓冲 应用自带
}
if (player.isPlaying()) {
Toast.makeText(getApplicationContext(), "已经播放，无需再点击", 0).show();
}if (!player.isPlaying()) {
player.start();
//不在播放时就播放
}
break;
case MUSIC_PAUSE:
if(player!=null&&player.isPlaying()){
player.pause();
}
break;
case MUSIC_SYOP:
if (player!=null) {
player.stop();
player.release();
player=null;
}
break;
default:
break;
}
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
Log.v(TAG, "ondestory");
if (player!=null) {
player.stop();
player.release();
player=null;
}
super.onDestroy();
}
public void show() {
// 服务属于上下文的子类
Toast.makeText(getApplicationContext(), "", 0).show();
}
}
在res目录下建一个raw文件夹，放一首歌曲到里面。才能放哦。想听歌吗 跑一遍代码吧~
