Android 避免2个相互影响的 EditText 死循环
两个EditText同时设置TextChangedListener后，会使程序进入死循环，解决方法如下：
etExchangeRateEn = (EditText) findViewById(R.id.etExchangeRateEn);etExchangeRateCn = (EditText) findViewById(R.id.etExchangeRateCn);twEN = new TextWatcher(){@Overridepublic void afterTextChanged(Editable s){etExchangeRateCn.addTextChangedListener(twCN);}@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after){}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count){etExchangeRateCn.setText( "CN");}};twCN = new TextWatcher(){@Overridepublic void afterTextChanged(Editable s){etExchangeRateEn.addTextChangedListener(twEN);}@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after){}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count){etExchangeRateEn.setText("EN");}};etExchangeRateEn.addTextChangedListener(twEN);etExchangeRateCn.addTextChangedListener(twCN);