android 监听EditText输入字符长度

项目当中的要求很多，最近遇到了一些要求，在Dialog上用户输入密码，当密码位数达到6位并且自动判断密码是否正确，如果正确Dialog自动消失，跳转其他界面。看似很艰难，其实只要你知道有这样一个监听就简单多了。这个监听就是addTextChangedListener(EditText s).

public class EditTextActivity extends Activity implements OnClickListener{    private EditText adb_password;    public boolean change = false;    private LinearLayout adb_lin2;    private Button button1;    private Button button2;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.kvadb);                adb_password = (EditText) findViewById(R.id.adb_password);        adb_lin2 = (LinearLayout) findViewById(R.id.adb_lin2);        button1 = (Button) findViewById(R.id.button1);        button2 = (Button) findViewById(R.id.button2);                button1.setOnClickListener(this);        button2.setOnClickListener(this);                adb_password.addTextChangedListener(mEditText);    }        TextWatcher mEditText = new TextWatcher() {        private CharSequence temp;                @Override        public void onTextChanged(CharSequence s, int start, int before, int count) {            temp = s;        }                @Override        public void beforeTextChanged(CharSequence s, int start, int count,                int after) {            adb_password.setVisibility(View.VISIBLE);            adb_lin2.setVisibility(View.GONE);        }                @Override        public void afterTextChanged(Editable s) {            if(adb_password.getText().length() == 6){                if(adb_password.getText().toString().equals("111111")){                    adb_password.setVisibility(View.GONE);                    adb_password.setFocusableInTouchMode(false);                    adb_password.setFocusable(false);                    adb_lin2.setVisibility(View.VISIBLE);                    adb_lin2.setFocusableInTouchMode(true);                    button1.requestFocus();                }            }        }    };        @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.button1:            Toast.makeText(KvAdb.this, "llll", 0).show();            break;        case R.id.button2:            finish();            break;        }    }}

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