1

我正在制作一个应用程序，每个活动都有自己的声音。我的问题是即使用户离开活动（转到另一个活动或按返回或主页键）声音仍在播放。

这是我的代码...

import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.SeekBar.OnSeekBarChangeListener;


    public class MainActivity extends Activity implements Runnable, OnClickListener, OnSeekBarChangeListener{
        private SeekBar seekBar;
        private ImageButton startMedia;
        private ImageButton pauseMedia;
        private MediaPlayer mp;

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

            TextView title1 = (TextView) findViewById(R.id.title1);
            TextView tx1 = (TextView) findViewById(R.id.textView1);
            Typeface font = Typeface.createFromAsset(getAssets(), "font.ttf");
            title1.setTypeface(font);
            tx1.setTypeface(font);

            AudioControl();    



        }



        public void AudioControl(){
            seekBar = (SeekBar) findViewById(R.id.seekBarnew2);
            startMedia = (ImageButton) findViewById(R.id.playbuttonnew2);
            pauseMedia = (ImageButton) findViewById(R.id.pausebuttonnew2);
            seekBar.setOnSeekBarChangeListener(this);
            startMedia.setOnClickListener(this);
            pauseMedia.setOnClickListener(this); 
        }



        public void run() {
            int currentPosition= 0;
            int total = mp.getDuration();
            while (mp!=null && currentPosition<total) {
                try {
                    Thread.sleep(1000);
                    currentPosition= mp.getCurrentPosition();
                } catch (InterruptedException e) {
                    return;
                } catch (Exception e) {
                    return;
                }            
                seekBar.setProgress(currentPosition);
            }
        }

        public void onClick(View v) {
            pauseMedia.setVisibility(View.VISIBLE);
            seekBar.setVisibility(View.VISIBLE);
            if (v.equals(startMedia)) {
                if (mp != null && mp.isPlaying()) return;
                if(seekBar.getProgress() > 0) {
                    mp.start();
                    return;
                }
                mp = MediaPlayer.create(MainActivity.this, R.raw.lone);
                mp.start();                     
                seekBar.setProgress(0);
                seekBar.setMax(mp.getDuration());
                new Thread(this).start();
            }
            if (v.equals(pauseMedia) && mp!=null) {
                mp.pause();
                pauseMedia.setVisibility(View.INVISIBLE);
            }       

        }

        public void onStartTrackingTouch(SeekBar seekBar) {
        }

        public void onStopTrackingTouch(SeekBar seekBar) {
        }

        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            if(fromUser) mp.seekTo(progress);

        }


    }
4

2 回答 2

2

重写 onStop 方法，该方法将在您的活动被隐藏或销毁时调用，并停止播放声音。

public void onStop() {
   super.onStop();
   mp.stop();
}
于 2013-07-14T00:59:41.763 回答
0

使用此功能 

public void onDestroy() {

            mp.stop();
            super.onDestroy();

        }
于 2014-04-03T10:21:49.153 回答