安卓刷卡机制

mmEditText = (EditText) findViewById(R.id.yyy);

mmEditText.setFocusable(true);

mmEditText.setFocusableInTouchMode(true);

mmEditText.requestFocus();

mmEditText.findFocus();

mmEditText.setText("");

mmEditText.addTextChangedListener(new TextWatcher() {

@Override

public void onTextChanged(CharSequence s, int start, int before,int count) {

}

@Override

public void beforeTextChanged(CharSequence s, int start, int count,  int after) {

}

@Override

public void afterTextChanged(Editable s) {

if(mmEditText.getText().toString().trim().equals("")){

System.out.println("清空");

}else{

if(delayRun!=null){

//每次editText有变化的时候，则移除上次发出的延迟线程

handler.removeCallbacks(delayRun);

}

//延迟800ms，如果不再输入字符，则执行该线程的run方法

handler.postDelayed(delayRun, 200);

}

}

});

、

private Handler handler = new Handler();

/** 延迟线程，看是否还有下一个字符输入 */

private Runnable delayRun = new Runnable() {

@Override

public void run() {

//在这里调用服务器的接口，获取数据

Toast.makeText(MainActivitysss.this, mmEditText.getText().toString().trim(), 100).show();

Namespace = mmEditText.getText().toString().trim();

long num = Long.parseLong(Namespace);//int的最大位数为214.299的10进制转换会报错，要用long

String cardId = Long.toHexString(num).toUpperCase();//10进制转16进制并且转大写

cardNO = cardId;

mmEditText.setText("");

}

};blog.csdn.net/nvcxy_1225/article/details/68943466