又是一個簡單的自定義ImageView

先上效果圖：

功能如下：

不點選的時候是某張圖片，點選後是某張圖片

廢話不多講，上程式碼：

step1:新建 Java檔案 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
 
);
        /**獲取自定義屬性pressed的Drawable並用成員變數儲存*/
mPressedDrawable = a.getDrawable(R.styleable.ClickFeedbackImageView_pressed);

        setOnTouchListener(this);

        if (mPressedDrawable !=null && isPressed()) {
            //如果在佈局中設定了pressed與normal，我們就要設定ImageView的圖片為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://鬆開
setImageDrawable(mNormalDrawable);
                break;
            default:break;
        }
        return false;
    }
}

step2:res/value/attr.xml搞事情

-----------如果沒有attr.xml就新建一個----------

--------------這裡是自定義的屬性---------------------------------

<?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:在佈局裡面用吧

<com.jabez.demo.widget.ClickFeedbackImageViewandroid: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"的使用需要在根佈局新增這個

xmlns:app="http://schemas.android.com/apk/res-auto"

完工！！！