roundimageview根据focuschangeListener实现不同的效果显示

RoundImageView可以通过focuschangeListener实现不同的效果显示，具体实现方法如下：

1.在RoundImageView类中添加一个focuschangeListener的接口

public interface OnFocusChangeListener {
    void onFocusChanged(RoundImageView view, boolean hasFocus);
}

2.在RoundImageView类中添加setOnFocusChangeListener方法，用来设置focuschangeListener

public void setOnFocusChangeListener(OnFocusChangeListener listener) {
    mOnFocusChangeListener = listener;
}

3.在RoundImageView类中重写onFocusChanged方法，当焦点改变时，调用focuschangeListener的onFocusChanged方法，实现不同的效果显示

@Override
public void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
    super.onFocusChanged(focused, direction, previouslyFocusedRect);
    if (mOnFocusChangeListener != null) {
        mOnFocusChangeListener.onFocusChanged(this, focused);
    }
    if (focused) {
        //实现获得焦点时的效果
    } else {
        //实现失去焦点时的效果
    }
}

4.在使用RoundImageView的地方，设置focuschangeListener，实现不同的效果显示

RoundImageView roundImageView = findViewById(R.id.round_image_view);
roundImageView.setOnFocusChangeListener(new RoundImageView.OnFocusChangeListener() {
    @Override
    public void onFocusChanged(RoundImageView view, boolean hasFocus) {
        if (hasFocus) {
            //实现获得焦点时的效果
        } else {
            //实现失去焦点时的效果
        }
    }
});