1. 程式人生 > >loading開源控制元件

loading開源控制元件


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自定義類
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import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import media.itsme.common.R;

public class LoadingImageView extends ImageView {

    private boolean mRequestAnim = true;

    public LoadingImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public LoadingImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

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

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (mRequestAnim) {
            startLoadingAnimation();
        }
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        clearAnimation();
    }
    
    @Override
    protected void onVisibilityChanged(View changedView, int visibility) {
        super.onVisibilityChanged(changedView, visibility);
        if (visibility == View.INVISIBLE || visibility == View.GONE) {
            clearAnimation();
            return;
        }
        if (mRequestAnim) {
            startLoadingAnimation();
        }
    }

    public void setmRequestAnim(boolean requestAnim) {
        if (mRequestAnim != requestAnim) {
            mRequestAnim = requestAnim;
            if (!mRequestAnim) {
                post(new Runnable() {
                    @Override
                    public void run() {
                        clearAnimation();
                    }
                });
            }
        }
    }

    /**
     * 當前LoadingImageView 屬性為VISIBLE 時才啟動動畫
     */
    private void startLoadingAnimation(){
        if (getVisibility() == View.VISIBLE) {
            try{
                Animation hyperspaceJumpAnimation = AnimationUtils.loadAnimation(getContext(), R.anim.comm_loading);
                startAnimation(hyperspaceJumpAnimation);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}

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 動畫檔案
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<?xml version="1.0" encoding="utf-8"?>