android - 在android中同时播放图像和音频

Question

我正在尝试在 android 中同时播放音频和图像...我有一个 ImageView 和两个用于返回和转到下一个的按钮..当我单击下一个按钮并继续正常工作时但是只要我点击后退按钮，只有音频文件会改变，图像不会改变。如果我再次点击后退按钮然后图像改变但有另一个音频文件..请帮我解决这个问题..谢谢这是我的代码

    public class Main extends Activity{

Button btn_back,btn_play,btn_next;
ImageView img_view;
int current_img = 0;
int current_aud = 0;
MediaPlayer mp;

int[] images = {R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,
                R.drawable.img6,R.drawable.img7,R.drawable.img8,R.drawable.img9,R.drawable.img10,
                R.drawable.img11,R.drawable.img12};

int[] audio = {R.raw.aud,R.raw.a,R.raw.aud,R.raw.a,R.raw.aud,R.raw.a,R.raw.aud,R.raw.a,
                R.raw.aud,R.raw.a,R.raw.aud,R.raw.a};

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    btn_back = (Button)findViewById(R.id.button1);
    btn_play = (Button)findViewById(R.id.button2);
    btn_next = (Button)findViewById(R.id.button3);
    img_view = (ImageView)findViewById(R.id.imageView1);
    img_view.setImageResource(R.drawable.ic_launcher);
    mp =new MediaPlayer();

    btn_play.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
        mp.stop();  
        }
    });

    btn_next.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            current_img = current_img % images.length;
            img_view.setImageResource(images[current_img]);
            current_img ++;
        try {
            if(mp != null){
                if(mp.isPlaying()){
                    mp.stop();
                //  mp.release();
                }
            }


            current_aud = current_aud % audio.length;

            mp.reset();
            mp = MediaPlayer.create(Main.this, audio[current_aud]);
            mp.start();
             current_aud ++;





        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

        }
    });

    btn_back.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            current_img = (current_img + images.length) % images.length;
            current_img --;
            img_view.setImageResource(images[current_img]);
            try {
                if(mp != null){
                    if(mp.isPlaying()){
                        mp.stop();
                        // mp.reset();
                    }
                }



                current_aud = (current_aud + audio.length)% audio.length;
                mp.reset();
                mp = MediaPlayer.create(Main.this, audio[current_aud]);
                current_aud --;
                mp.start();





            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }   
            }

    });

Answer 1

    public class Main extends Activity implements OnClickListener{

        Button btn_back,btn_play,btn_next;
        ImageView img_view;
        int current_img = 0;
        int current_aud = 0;
        MediaPlayer mp;

        int[] images = {R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,
                    R.drawable.img6,R.drawable.img7,R.drawable.img8,R.drawable.img9,R.drawable.img10,
                    R.drawable.img11,R.drawable.img12};

        int[] audio = {R.raw.aud,R.raw.a,R.raw.aud,R.raw.a,R.raw.aud,R.raw.a,R.raw.aud,R.raw.a,
                    R.raw.aud,R.raw.a,R.raw.aud,R.raw.a};

        @Override
        protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btn_back = (Button)findViewById(R.id.button1);
        btn_play = (Button)findViewById(R.id.button2);
        btn_next = (Button)findViewById(R.id.button3);
        img_view = (ImageView)findViewById(R.id.imageView1);
        img_view.setImageResource(R.drawable.ic_launcher);
        mp =new MediaPlayer();

        btn_play.setOnClickListener(this);

        btn_next.setOnClickListener(this);

        btn_back.setOnClickListener(this);
        }

        @Override
        public void OnClick(View view){
            switch(view.getId()){
                case R.id.button1:
                    current_img --;
                    if(current_img == -1){
                        current_img = images.length-1;
                    }
                    img_view.setImageResource(images[current_img]);             
                    if(mp != null && mp.isPlaying()){
                        mp.stop();
                    }
                    current_aud--;
                    if(current_aud == -1){
                        current_aud = audio.length-1;
                    }
                    mp.reset();
                    mp = MediaPlayer.create(Main.this, audio[current_aud]);
                    current_aud --;
                    mp.start();
                    break;

                case R.id.button3:
                    current_img ++;
                    if(current_img == images.length){
                        current_img = 0;
                    }
                    img_view.setImageResource(images[current_img]);             
                    if(mp != null && mp.isPlaying()){
                        mp.stop();
                    }
                    current_aud++;
                    if(current_aud == audio.length){
                        current_aud = 0;
                    }
                    mp.reset();
                    mp = MediaPlayer.create(Main.this, audio[current_aud]);
                    current_aud --;
                    mp.start();
                    break;

                    case R.id.button2:
                        if(mp != null && mp.isPlaying()){
                            mp.stop();
                        }
                        break;
            }
        }

    }