Android 中soundpool的应用:
实现效果:
点击暂停 音乐暂停
点击开始 音乐播放
当复选按钮选择之后 播放背景音乐,取消之后没有背景音乐
MainActivity.java 代码:
import java.io.IOException;
import java.util.HashMap;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.SoundPool;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
public class MainActivity extends Activity {
private Button bt1, bt2;
private CheckBox cb1;
private MediaPlayer player;
private SoundPool sp;
private ImageView iv1;
private HashMap<Integer, Integer> hm = new HashMap<Integer, Integer>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt1 = (Button) findViewById(R.id.bt1);
bt2 = (Button) findViewById(R.id.bt2);
cb1 = (CheckBox) findViewById(R.id.cb1);
iv1 = (ImageView) findViewById(R.id.iv1);
player = new MediaPlayer();
String path = "/sdcard/b.mp3";
try {
player.setDataSource(path);
player.prepare();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
player.setLooping(true);
player.start();
final Animation a = AnimationUtils.loadAnimation(MainActivity.this,
R.anim.dh);
sp = new SoundPool(5, AudioManager.STREAM_SYSTEM, 0);
hm.put(1, sp.load(MainActivity.this, R.raw.c, 0));
cb1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
// TODO Auto-generated method stub
if (!cb1.isChecked()) {
player.pause();
} else
player.start();
}
});
bt2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
iv1.setVisibility(View.INVISIBLE);
iv1.startAnimation(a);
a.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation arg0) {
// TODO Auto-generated method stub
sp.play(hm.get(1), 1, 1, 0, -1, 1);
}
@Override
public void onAnimationRepeat(Animation arg0) {
// TODO Auto-generated method stub
sp.play(hm.get(1), 1, 1, 0, -1, 1);
}
@Override
public void onAnimationEnd(Animation arg0) {
// TODO Auto-generated method stub
}
});
}
});
}
protected void onPause() {
super.onPause();
player.release();
sp.release();
}
}
activity_main.xml 代码:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/bt1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="暂停" />
<Button
android:id="@+id/bt2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/bt1"
android:text="开始" />
<CheckBox
android:id="@+id/cb1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/bt2"
android:layout_centerHorizontal="true"
android:text="背景音乐" />
<ImageView
android:id="@+id/iv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginLeft="30dp"
android:background="@drawable/ic_launcher"
android:visibility="invisible" />
</RelativeLayout>
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