仿微信password控件，实现密码可见于不可见功能

package cn.com.dsyc.canteenappforseller.widget;

import cn.com.dsyc.canteenappforseller.R;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;

public class VisiblePasswordEditText extends EditText {

private Drawable mPasswordShow;
private Drawable mPasswordHide;
private boolean mHide = true;

public VisiblePasswordEditText(Context context) {
super(context);
// TODO Auto-generated constructor stub
if (!isInEditMode())
init();
}

public VisiblePasswordEditText(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
if (!isInEditMode())
init();
}

public VisiblePasswordEditText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
if (!isInEditMode())
init();
}

private void init()
{
mPasswordShow = getResources().getDrawable(R.drawable.password_show);
mPasswordHide = getResources().getDrawable(R.drawable.password_hide);
mPasswordShow.setBounds(0, 0, mPasswordShow.getIntrinsicWidth(), mPasswordShow.getIntrinsicHeight());
mPasswordHide.setBounds(0, 0, mPasswordHide.getIntrinsicWidth(), mPasswordHide.getIntrinsicHeight());
setHeight(mPasswordHide.getIntrinsicHeight() + getResources().getDimensionPixelSize(R.dimen.one_dp_padding) * 5);
update();

setOnTouchListener(new OnTouchListener() {

@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
if (getCompoundDrawables()[2] != null) {
if (event.getAction() == MotionEvent.ACTION_UP && event.getX() > getWidth() - getPaddingRight() - mPasswordHide.getIntrinsicWidth()) {
mHide = !mHide;
update();
}
}
return false;
}
});

}

private void update() {
Drawable[] drawables = getCompoundDrawables();
if (mHide) {
setInputType(EditorInfo.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_PASSWORD);
setCompoundDrawables(drawables[0], drawables[1], mPasswordHide, drawables[3]);
} else {
setInputType(EditorInfo.TYPE_CLASS_TEXT);
setCompoundDrawables(drawables[0], drawables[1], mPasswordShow, drawables[3]);
}
setSelection(getText().length());
}

}