Android 开发仿简书登录框可删除内容或显示密码框的内容

package lyf.myimgedittextdemo;import android.content.Context;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.text.Editable;import android.text.TextWatcher;import android.util.AttributeSet;import android.view.MotionEvent;import android.widget.EditText;/*** lyf on 2016/12/6.* 自定义的EditText右边带图片，可以设置点击事件*/public class ImgEditText extends EditText implements TextWatcher {//控件左边的图片private Drawable leftDrawable = null;//控件右边的图片private Drawable rightDrawable = null;// 控件是否有焦点private boolean hasFoucs;private IMyRightDrawableClick mightDrawableClick;public ImgEditText(Context context) {this(context, null);}public ImgEditText(Context context, AttributeSet attrs) {//这里构造方法也很重要，不加这个很多属性不能再XML里面定义this(context, attrs, android.R.attr.editTextStyle);}public ImgEditText(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}//初始化基本图片private void init() {//获取RadioButton的图片集合Drawable[] drawables = getCompoundDrawables();leftDrawable = drawables[0];rightDrawable = drawables[2];setCompoundDrawablesWithIntrinsicBounds(leftDrawable, null, null, null);//设置输入框里面内容发生改变的监听addTextChangedListener(this);}//设置显示图片的大小public void setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top, Drawable right, Drawable bottom) {super.setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom);//这里只要改后面两个参数就好了，一个宽一个是高，如果想知道为什么可以查找源码if (left != null) {left.setBounds(0, 0, 50, 50);}if (right != null) {right.setBounds(0, 0, 50, 50);}if (top != null) {top.setBounds(0, 0, 100, 100);}if (bottom != null) {bottom.setBounds(0, 0, 100, 100);}setCompoundDrawables(left, top, right, bottom);}//光标选中时判断@Overrideprotected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {super.onFocusChanged(focused, direction, previouslyFocusedRect);this.hasFoucs = focused;if (focused) {setImageVisible(getText().length() > 0);} else {setImageVisible(false);}}//设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去protected void setImageVisible(boolean flag) {//如果当前右侧有图片则覆盖右侧的图片，如果没有还是显示原来的图片if (getCompoundDrawables()[2] != null) {rightDrawable = getCompoundDrawables()[2];}if (flag) {setCompoundDrawables(getCompoundDrawables()[0], null, rightDrawable, null);} else {setCompoundDrawables(getCompoundDrawables()[0], null, null, null);}}//文本框监听事件@Overridepublic void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {if (hasFoucs) {if (text.length() > 0) {setImageVisible(true);} else {setImageVisible(false);}}}public void beforeTextChanged(CharSequence s, int start, int count, int after) {}public void afterTextChanged(Editable s) {}/*** 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件* 当我们按下的位置 在 EditText的宽度 - 图标到控件右边的间距 - 图标的宽度 和* EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向就没有考虑* （参考 http://blog.csdn.net/xiaanming/article/details/11066685/）*/@Overridepublic 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) {//调用点击事件（外部实现）mightDrawableClick.rightDrawableClick();}}}return super.onTouchEvent(event);}//设置右侧按钮的点击事件，外部调用的时候实现该方法public void setDrawableClick( IMyRightDrawableClick myMightDrawableClick){this.mightDrawableClick = myMightDrawableClick;}//自定义接口（实现右边图片点击事件）public interface IMyRightDrawableClick {void rightDrawableClick();}//允许外部修改右侧显示的图片public void setRightDrawable(Drawable drawable){rightDrawable = drawable;setCompoundDrawablesWithIntrinsicBounds(leftDrawable, null, rightDrawable, null);}}

<lyf.myimgedittextdemo.ImgEditTextandroid:id="@+id/pwdIet"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:background="@null"android:drawableLeft="@mipmap/mm_image"android:drawableRight="@mipmap/eye_normal"android:paddingLeft="15dp"android:paddingRight="15dp"android:paddingTop="5dp"android:drawablePadding="15dp"android:layout_marginTop="10dp"android:layout_marginBottom="10dp"android:hint="密码"android:inputType="numberPassword" />

pwdIet = (ImgEditText) this.findViewById(R.id.pwdIet);pwdIet.setDrawableClick(new ImgEditText.IMyRightDrawableClick() {@Overridepublic void rightDrawableClick() {if (isHidden) {//设置EditText文本为可见的pwdIet.setTransformationMethod(HideReturnsTransformationMethod.getInstance());pwdIet.setRightDrawable(getResources().getDrawable(R.mipmap.eye_selected));} else {//设置EditText文本为隐藏的pwdIet.setTransformationMethod(PasswordTransformationMethod.getInstance());pwdIet.setRightDrawable(getResources().getDrawable(R.mipmap.eye_normal));}isHidden = !isHidden;pwdIet.postInvalidate();//切换后将EditText光标置于末尾CharSequence charSequence = pwdIet.getText();if (charSequence instanceof Spannable) {Spannable spanText = (Spannable) charSequence;Selection.setSelection(spanText, charSequence.length());}}});