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
@Override
protected 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
@Override
public 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/）
*/
@Override
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) {
//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.ImgEditText
android: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() {
@Override
public 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());
}
}
});