在Android应用程序中播放背景音

Question

我想在我的应用程序中播放背景声音.帮帮我怎么做？...这是整个代码.

public class Numbers extends Activity {
    public static MediaPlayer mp = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_numbers);
        ViewPager viewPager = (ViewPager)findViewById(R.id.view_pager);
        ImagePagerAdapter adapter = new ImagePagerAdapter();
        viewPager.setAdapter(adapter);
    }

    private class ImagePagerAdapter extends PagerAdapter {
        private int[] mImages = new int[]{R.drawable.no1,R.drawable.no2,R.drawable.no3,R.drawable.no4,R.drawable.no5,R.drawable.no6,R.drawable.no7,R.drawable.no8,R.drawable.no9};

        @Override
        public int getCount() {
            return mImages.length;
        }
        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == ((ImageView) object);
        }
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            Context context = Numbers.this;
            ImageView imageView = new ImageView(context);
            int padding =context.getResources().  
            getDimensionPixelSize(R.dimen.activity_vertical_margin);
            imageView.setPadding(padding, padding, padding, padding);
            imageView.setScaleType(ImageView.ScaleType.CENTER);
            imageView.setImageResource(mImages[position]);
            ((ViewPager) container).addView(imageView, 0);

            @Override
            public void destroyItem(ViewGroup container, int position, Object object) {
                ((ViewPager) container).removeView((ImageView) object);
            }
        }
    }//end of sub-class ImagePagerAdapter
}//End of Numbers class

只需告诉我我需要在此代码中添加什么来播放背景音乐,这将是循环模式,直到应用程序运行.

Answer 1

最好将您的媒体代码投入使用.这是在后台播放媒体的最佳方式.

public class serv extends Service{

    MediaPlayer mp;
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
    public void onCreate()
    {   
        mp = MediaPlayer.create(this, R.raw.b);
        mp.setLooping(false);
    }
    public void onDestroy()
    {       
        mp.stop();
    }
    public void onStart(Intent intent,int startid){

        Log.d(tag, "On start");
        mp.start();
    }
}

其中raw是在资源中创建的文件夹.并且R.raw.b是一个mp3文件.

Answer 2

这是在android studio 2.2.3中测试的

1)先复制并粘贴music.mp3到app.res.raw.

2)将服务设置为AndroidManifest.xml如下:

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    :
    :
    <service android:name=".SoundService"  android:enabled="true"></service>
</application>

3)添加SoundService.java包含此代码的文件:

package com.jahanweb.ring;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;

public class SoundService extends Service {
    MediaPlayer player;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    public void onCreate() {
        player = MediaPlayer.create(this, R.raw.music); //select music file
        player.setLooping(true); //set looping
    }

    public int onStartCommand(Intent intent, int flags, int startId) {
        player.start();
        return Service.START_NOT_STICKY;
    }

    public void onDestroy() {
        player.stop();
        player.release();
        stopSelf();
        super.onDestroy();
    }

}

4)在活动中使用它如下:

package com.jahanweb.ring;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        //start service and play music
        startService(new Intent(MainActivity.this, SoundService.class));

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    protected void onDestroy() {
        //stop service and stop music
        stopService(new Intent(MainActivity.this, SoundService.class));
        super.onDestroy();
    }
}

Answer 3

MediaPlayer  player = MediaPlayer.create(this,  R.raw.music);
player.setLooping(true); // Set looping
player.setVolume(100,100);

public int onStartCommand(Intent intent, int flags, int startId) {
    player.start();
    return 1;
}

@Override
public void onDestroy() {
    player.stop();
    player.release();
}

public void onStart(Intent intent, int startId) 
{
    // TODO
}