自定义ImageView，点击反馈效果

又是一个简单的自定义ImageView

先上效果图：

点击后不松开的状态是原图加了个阴影。

功能如下：

不点击的时候是某张图片，点击后是某张图片

废话不多讲，上代码：

step1:新建 Java文件 ClickFeedbackImageView.java

import android.content.Context;import android.content.res.TypedArray;import android.graphics.drawable.Drawable;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.ImageView;import com.jabez.demo.R;/** * Created by Jabez on 2017/5/15. */public class ClickFeedbackImageView extends ImageView implements View.OnTouchListener {    private Drawable mPressedDrawable;    private Drawable mNormalDrawable;    public ClickFeedbackImageView(Context context) {        super(context);    }    public ClickFeedbackImageView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        mNormalDrawable = getDrawable();        final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ClickFeedbackImageView);        /**获取自定义属性pressed的Drawable并用成员变量保存*/        mPressedDrawable = a.getDrawable(R.styleable.ClickFeedbackImageView_pressed);        setOnTouchListener(this);        if (mPressedDrawable !=null && isPressed()) {            //如果在布局中设置了pressed与normal，我们就要设置ImageView的图片为mPressedDrawable            setImageDrawable(mPressedDrawable);        }        a.recycle();    }    @Override    public void setImageDrawable(@Nullable Drawable drawable) {        super.setImageDrawable(drawable);    }    @Override    public boolean onTouch(View v, MotionEvent event) {        switch (event.getAction()){            case MotionEvent.ACTION_DOWN://按下                setImageDrawable(mPressedDrawable);                break;            case MotionEvent.ACTION_UP://松开                setImageDrawable(mNormalDrawable);                break;            default:break;        }        return false;    }}

step2:res/value/attr.xml搞事情

-----------如果没有attr.xml就新建一个----------

--------------这里是自定义的属性---------------------------------

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="ClickFeedbackImageView">        <attr name="pressed" format="reference" />        <attr name="normal" format="reference" />    </declare-styleable></resources>

step3:在布局里面用吧

<com.jabez.demo.widget.ClickFeedbackImageView    android:layout_width="100dp"    android:layout_height="wrap_content"    android:src="@mipmap/img_normal"    app:pressed="@mipmap/img_pressed"    android:adjustViewBounds="true"/>
PS：app:pressed="@mipmap/img_pressed"的使用需要在根布局添加这个
xmlns:app="http://schemas.android.com/apk/res-auto"
完工！！！