Android自定义EditText实现淘宝登录功能

 <com.example.zdyedittext.ClearEditText
    android:id="@+id/editText1"
    android:layout_width="fill_parent"
    android:layout_height="35dp"
    android:layout_alignTop="@+id/imageView1"
    android:layout_marginLeft="17dp"
    android:layout_toRightOf="@+id/imageView1"
    android:background="@android:color/white"
    android:ems="10"
    android:hint="手机号"
    android:padding="8dp"
    android:singleLine="true" />

  <com.example.zdyedittext.ClearEditText
    android:id="@+id/et_pass_word"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="密码"
    android:background="@android:color/white"
    android:password="true"
    android:padding="8dp"
    android:singleLine="true" />

public class ClearEditText extends EditText 

 public ClearEditText(Context context, AttributeSet attrs) {  
    this(context, attrs, android.R.attr.editTextStyle); 
  } 

 public ClearEditText(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    init(); 
  } 

private void init() { 
    // 获取EditText的DrawableRight,假如没有设置我们就使用默认的图片 
    mClearDrawable = getCompoundDrawables()[2]; 
    if (mClearDrawable == null) {  
      mClearDrawable = getResources().getDrawable(R.drawable.del);//R.drawable.del删除图标的图片 
    } 
    mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight()); 

    //设置图标的左上右下
    // 默认设置隐藏图标 
    setClearIconVisible(false); 
    // 设置焦点改变的监听 
    setOnFocusChangeListener(this); 
    // 设置输入框里面内容发生改变的监听 
    addTextChangedListener(this); 
  } 

public boolean onTouchEvent(MotionEvent event) { 
    if (event.getAction() == MotionEvent.ACTION_UP) { 
      if (getCompoundDrawables()[2] != null) { 

        boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight()) && (event.getX() < ((getWidth() - getPaddingRight()))); 

        if (touchable) { 
          this.setText(""); 
        } 
      } 
    } 

    return super.onTouchEvent(event); 
  } 

public void onFocusChange(View v, boolean hasFocus) { 
    this.hasFoucs = hasFocus; 
    if (hasFocus) { 
      setClearIconVisible(getText().length() > 0); 
    } else { 
      setClearIconVisible(false); 
    } 
  } 

protected void setClearIconVisible(boolean visible) { 
    Drawable right = visible ? mClearDrawable : null; 
    setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], right, getCompoundDrawables()[3]); 
  }

 public void onTextChanged(CharSequence s, int start, int count, int after) { 
    if (hasFoucs) { 
      setClearIconVisible(s.length() > 0); 
    } 
  } 

 private class PasswordCharSequence implements CharSequence {
    private CharSequence mSource;
    public PasswordCharSequence(CharSequence source) {
      mSource = source; // Store char sequence
    }
    这里用于修改InputType的返回样式
    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
    }
  }

et_pass_word = (ClearEditText) findViewById(R.id.et_pass_word);
et_pass_word.setTransformationMethod(new EditTextBgToStar());