如何使用自定义图片代替'*'中的EditText密码字段？

How to use custom image instead of '*' in edittext password field?

看图片：

任何答案或暗示将大大AP preciated。

Any answer or hint will be greatly appreciated.

推荐答案

答案来自的本教程以及它涵盖了行为，当一个用户：

The answer comes from this tutorial and it covers a behaviour when a user:

进入登陆界面，键盘会自动打开。

enters into the login screen, keyboard will open automatically.

试图在它，然后文本框的背景变化与明星背景输入值的文本框。

tries to enter value in it then textbox background changes to textbox with star background.

尝试取消/使用返回键键盘上删除输入值，那么文本框的背景将变为文本没有明星的背景。

tries to cancel/delete the input value by using back key on keyboard then textbox background will change to textbox without star background.

你所创建的前两个可绘制：

然后，根据这种方法，你必须实现你的的EditText addTextChangedListener 方法。在此之后，作为一个参数，你创建一个 TextWatcher 类的新实例，你实现它的方法：

Then, according to this approach, you have to implement addTextChangedListener method on your EditText. After that, as a parameter, you create a new instance of a TextWatcher class and you implement its methods:

etxtPin1.addTextChangedListener(new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
       // TODO Auto-generated method stub

    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

    }
    @Override
    public void afterTextChanged(Editable s) {
          if(etxtPin1.getText().toString().trim().length()==1){

          etxtPin1.clearFocus();
          etxtPin2.requestFocus();
          etxtPin1.setBackgroundResource(R.drawable.pin_txt_bg_star);

          }
       }
    });

然后，你必须实现 setOnKeyListener 及其方法安其：

this.etxtPin1.setOnKeyListener(new View.OnKeyListener() {
      public boolean onKey(View paramView, int paramInt, KeyEvent paramKeyEvent) {
           if ((paramKeyEvent.getAction() == KeyEvent.ACTION_DOWN)&&(paramInt == 67) && (LoginActivity.this.etxtPin2.getText().length() == 0)) {
               etxtPin1.requestFocus();
               etxtPin1.setBackgroundResource(R.drawable.pin_txt_bg);
               etxtPin1.setText("");
           }

           return false;
       }
    });

另一种方法：创建您自己的延伸 PasswordTransformationMethod 。

public class MyPasswordTransformationMethod extends PasswordTransformationMethod {
    @Override
    public CharSequence getTransformation(CharSequence source, View view) {
        return new PasswordCharSequence(source);
    }

    private class PasswordCharSequence implements CharSequence {
        private CharSequence mSource;
        public PasswordCharSequence(CharSequence source) {
            mSource = source; // Store char sequence
        }
        public char charAt(int index) {
            return '*'; // This is the important part
        }
        public int length() {
            return mSource.length(); // Return default
        }
        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end); // Return default
        }
    }
};

参考：In android怎么样展现到位点的星号（*）的有inputType下为textPassword的EditText？