Imageview 实现Checkable

package com.XXX.XXX.view;

import android.content.Context;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.widget.Checkable;
import android.widget.ImageView;

/**

• Created by pingkoko on 2017/8/9.
  */

public class ImageViewCheckable extends ImageView implements Checkable {

private boolean mChecked;


private static final int[] CHECK_STATE_SET = {android.R.attr.state_checked};

public ImageViewCheckable(Context context) {
    super(context);
}

public ImageViewCheckable(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
}

public ImageViewCheckable(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

public ImageViewCheckable(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
}

@Override
public void setChecked(boolean checked) {
    if (mChecked != checked) {
        mChecked = checked;
        refreshDrawableState();//刷新drawable状态
    }
}

/**
 * Imageview默认不支持state_checked状态，需要重写此方法
 *
 * @param extraSpace
 * @return
 */
@Override
public int[] onCreateDrawableState(int extraSpace) {
    int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
    if (isChecked()) {
        mergeDrawableStates(drawableState, CHECK_STATE_SET);
    }
    return drawableState;
}

@Override
public boolean isChecked() {
    return mChecked;
}

@Override
public void toggle() {
    setChecked(!mChecked);
}

}