Android(安卓)设置DrawableRight和DrawableLeft点击事件
16lz
2022-03-26
Android的TextView有个DrawableLeft和DrawableRight属性,UI布局中经常会用到。比如登陆界面,用户名和密码前面的图像,就是用DrawableLeft来设置的。
但比较郁闷的是,android并没有为DrawableLeft和DrawableRight提供监听点击事件的api,但这个需求是很常见的,比如输入密码的时候,点击右边的眼睛,密码变为明文。
其实思路很简单,我们只要重写EditText的onTouchEvent,捕捉到点击事件,然后判断用户点击的位置是否点击到图标即可,不废话,用代码说话。
1、添加XTextView类继承自TextView
import android.content.Context;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;public class XTextView extends android.support.v7.widget.AppCompatTextView { private DrawableLeftListener mLeftListener; private DrawableRightListener mRightListener; final int DRAWABLE_LEFT = 0; final int DRAWABLE_TOP = 1; final int DRAWABLE_RIGHT = 2; final int DRAWABLE_BOTTOM = 3; public XTextView(Context context) { super(context); } public XTextView(Context context, AttributeSet attrs) { super(context, attrs); } public XTextView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public void setDrawableLeftListener(DrawableLeftListener listener) { this.mLeftListener = listener; } public void setDrawableRightListener(DrawableRightListener listener) { this.mRightListener = listener; } public interface DrawableLeftListener { public void onDrawableLeftClick(View view); } public interface DrawableRightListener { public void onDrawableRightClick(View view); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (mRightListener != null) { Drawable drawableRight = getCompoundDrawables()[DRAWABLE_RIGHT]; if (drawableRight != null && event.getRawX() >= (getRight() - drawableRight.getBounds().width())) { mRightListener.onDrawableRightClick(this); return true; } } if (mLeftListener != null) { Drawable drawableLeft = getCompoundDrawables()[DRAWABLE_LEFT]; if (drawableLeft != null && event.getRawX() <= (getLeft() + drawableLeft.getBounds().width())) mLeftListener.onDrawableLeftClick(this); return true; } break; } return super.onTouchEvent(event); }}
2、layout
3、activity添加点击响应
xtvLoginBack.setDrawableLeftListener(new XTextView.DrawableLeftListener() { @Override public void onDrawableLeftClick(View view) { onBackPressed(); }});
参考:
http://blog.csdn.net/tom_xiaoxie/article/details/50771763
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