android 背景音乐的实现

界面图

具体实现步骤

<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.bzu.r2.beijingyinyue.MainActivity" >

<Button
android:id="@+id/btn_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="66dp"
android:onClick="onClick"
android:text="开    始" />

<Button
android:id="@+id/btn_end"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="62dp"
android:onClick="onClick"
android:text="停    止" />

</RelativeLayout>

public class MainActivity extends Activity {

private Button btnstart;
private Button btnstop;

private MediaPlayer mp; // MediaPlayer引用
private AudioManager am;// AudioManager引用

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

btnstart = (Button) findViewById(R.id.btn_start);
btnstop = (Button) findViewById(R.id.btn_end);

mp = new MediaPlayer();
try {
mp.setDataSource("./raw/abc.mp3");// 设置路径
mp.prepare();// 缓冲
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

btnstart.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mp.start();
Toast.makeText(getApplicationContext(), "音乐开始播放！",
Toast.LENGTH_SHORT).show();
}
});
btnstop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mp.stop();
Toast.makeText(getApplicationContext(), "音乐停止播放！",
Toast.LENGTH_SHORT).show();
}
});
}
}