Android-EditText 監聽 字數 限制

想必各位大大多少會遇到輸入字框的字數限制
這裡就為大家整理一份出來
( 未完成 )
1 . addTextChangedListener
監聽文字被改變時

public class MainActivity extends Activity {

    private String TAG = "EditTextSample";
    private EditText editText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editText = (EditText) findViewById(R.id.editText1);
        editText.addTextChangedListener(new TextWatcher(){

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                Log.d(TAG,"之前是 : " + s);

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {
                Log.d(TAG,"文字被改變時 : " + s);

            }

            @Override
            public void afterTextChanged(Editable s) {
                Log.d(TAG,"之後為 : " + s);

            }});
    }
}

2 .

參考資料 : 來源1