android - 检查是否正在播放MediaPlayer？怎么样？

Question

任何人都知道如何检查是否正在播放MediaPlayer。在测试中，在添加if语句之前，音频可以正常播放，但是现在我被强制关闭了。我想要的是，当有人单击另一个按钮时，当前音频停止，新音频播放。我以为那很容易，但似乎并非如此。我以为我正确地编写了代码。我的代码正确吗？我想念什么？任何帮助，将不胜感激。

      lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View view, int pos,
                long id) {

            if (mp.isPlaying()) {

                mp.stop();
                mp.release();

            }

            else {

            if (pos==0) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2200);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==1) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2201);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });
            }

            if (pos==2) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2202);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });
            }

            if (pos==3) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2203);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==4) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2204);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });
            }

            if (pos==5) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2205);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });
            }

            if (pos==6) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2206);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==7) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2207);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==8) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2208);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==9) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2209);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==10) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2210);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==11) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2211);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==12) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2212);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==13) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2213);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==14) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2214);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==15) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2215);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            if (pos==16) {

                mp = MediaPlayer.create(getBaseContext(), R.raw.v_2216);
                mp.start();
                mp.setOnCompletionListener(new OnCompletionListener() {
                    public void onCompletion(MediaPlayer mp) {
                        mp.release();
                        }
                });

            }

            }

        }
    });

Answer 1

在调用isPlaying()之前检查null，并在所有发行版调用之后将其设置为null，这样发行版就不会被调用两次。

  if (mp != null && mp.isPlaying()) {    
       mp.stop();
       mp.release();
       mp = null;
  }