android採用語音檔案形式讓TextView和EditText發出聲音

讓TextView和EditText發出聲音在撥打到電話等應用中很常見，如果採用TTS語音引擎未免太麻煩！所以可以採用MediaPlayer播放語音檔案的形式

下面是關鍵代碼：

關鍵變數定義

private TextView numInput;private int length = 0; //當前字串長度private int beforeLength = 0;//上一次字串長度private MediaPlayer mediaPlayer;private ArrayList mListeners = null;EditTextWatchTEL watch;

初始化使用方法

                watch = new EditTextWatchTEL();numInput.addTextChangedListener(watch);if (mListeners == null) {mListeners = new ArrayList();}mListeners.add(watch);

主要代碼

private class EditTextWatchTEL implements TextWatcher {@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after) {}@Overridepublic void afterTextChanged(Editable s) {if (length > 0) {if (beforeLength <= length) {beforeLength = length;List list = new ArrayList();for(int i=0;i<10;i++){list.add(String.valueOf(i));}String num = numInput.getText().toString().substring(beforeLength - 1);if(list.contains(num)){int value = Integer.parseInt(num);switch (value) {case 0:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  } //R.raw.zero 為raw檔案夾的語音檔案 ，以下同上mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.zero);mediaPlayer.start();break;case 1:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.one);mediaPlayer.start();break;case 2:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.two);mediaPlayer.start();break;case 3:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.three);mediaPlayer.start();break;case 4:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.four);mediaPlayer.start();break;case 5:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.five);mediaPlayer.start();break;case 6:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.six);mediaPlayer.start();break;case 7:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.seven);mediaPlayer.start();break;case 8:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.eight);mediaPlayer.start();break;case 9:if(mediaPlayer!= null){  //一定要清空播放器資源  mediaPlayer.stop();    mediaPlayer.release();    mediaPlayer = null ;                  }   mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.nine);mediaPlayer.start();break;default:break;}}} else {beforeLength = length;}}}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count) {length = numInput.getText().length();}}    //移除監聽public void removeTextChangedListener(TextWatcher watcher) {if (mListeners != null) {int i = mListeners.indexOf(watcher);if (i >= 0) {mListeners.remove(i);}}numInput.removeTextChangedListener(watcher);}@Overrideprotected void onDestroy() {removeTextChangedListener(watch);super.onDestroy();}

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