android - 对于输入类型为 textWebPassword 的 EditText，TextWatcher 的 onTextChanged 方法中的计数参数无法正常工作

Question

对于输入类型为 textWebPassword 的 EditText，TextWatcher 的 onTextChanged 方法中的计数参数无法正常工作。 即使 EditText 中有超过 1 个字符，else if(count==1) 中的代码仍在运行。

public class Test extends AppCompatActivity {
private EditText ePassword;
private TextView tPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sign_in);
    tPassword = (TextView) findViewById(R.id.textView_password);
    ePassword = (EditText) findViewById(R.id.editText_password);
    ePassword.addTextChangedListener(textWatcherPassword);


}
private TextWatcher textWatcherPassword = new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

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

        if (count == 0) {
            // start fade out animation
            tPassword.setAnimation(AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_out));
            //Make the elements invisible
            tPassword.setVisibility(View.INVISIBLE);

        }
        else if(count==1){
            // Make fade in elements Visible first
            tPassword.setVisibility(View.VISIBLE);
            // start fade in animation
            tPassword.setAnimation(AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_in));
        }
        Log.e("Count", count + "");
    }

    @Override
    public void afterTextChanged(Editable s) {

    }
};
}

Logcat 输出为(对于超过 1 个字符的密码):

08-19 16:54:49.465  25167-25167/com.test.example E/Count﹕ 1
08-19 16:54:49.607  25167-25167/com.test.example E/Count﹕ 1
08-19 16:54:49.756  25167-25167/com.test.example E/Count﹕ 1
08-19 16:54:49.881  25167-25167/com.test.example E/Count﹕ 1
08-19 16:54:50.006  25167-25167/com.test.example E/Count﹕ 1
08-19 16:54:50.122  25167-25167/com.test.example E/Count﹕ 1

Answer 1

经过一些研究，我通过使用 s.length()==1 而不是 count==1 来运行我的代码。

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        if (s.length() == 0) {
            // start fade out animation
            tPassword.setAnimation(AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_out));
            //Make the elements invisible
            tPassword.setVisibility(View.INVISIBLE);

        } else if (s.length() == 1) {
            // Make fade in elements Visible first
            tPassword.setVisibility(View.VISIBLE);
            // start fade in animation
            tPassword.setAnimation(AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_in));
        }
    }