因为好用，所以值得收藏。
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一、创建切换背景布局类
public class LaunchAppAnimatedBgRelativeLayout extends
RelativeLayout {
private Random random;
private final float MAX_ALPHA = 1F;
private final float MIN_ALPHA = 0F;
private final int ANIMATION_DURATION =
800;
private final int DISPLAY_DURATION = (2000 +
ANIMATION_DURATION);
private Handler handler;
private ImageView animationImageView;
private ImageView staticImageView;
private List imageIdList;
private int currentImageIndex = -1;
private boolean isContinueLoop = true;
public
LaunchAppAnimatedBgRelativeLayout(Context context,
AttributeSet
attrs, int defStyle) {
super(context, attrs,
defStyle);
init();
}
public
LaunchAppAnimatedBgRelativeLayout(Context context, AttributeSet
attrs) {
super(context, attrs);
init();
}
public
LaunchAppAnimatedBgRelativeLayout(Context context) {
super(context);
init();
}
private void init() {
random = new Random();
handler = new Handler();
staticImageView =
makeNewImageView();
animationImageView =
makeNewImageView();
this.setBackgroundColor(Color.BLACK);
}
private ImageView makeNewImageView() {
ImageView imageView = new
ImageView(getContext());
imageView.setScaleType(ScaleType.CENTER_CROP);
this.addView(imageView, new
LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
return imageView;
}
private int calNextImageIdIndex() {
currentImageIndex++;
if (currentImageIndex >
imageIdList.size() - 1) {
currentImageIndex
= 0;
}
return currentImageIndex;
}
private void
setAlphaAnimatedImageViewFadeOut() {
calNextImageIdIndex();
float fromAlpha =
MAX_ALPHA;
float toAlpha =
MIN_ALPHA;
AlphaAnimation alphaAnimation =
new AlphaAnimation(fromAlpha, toAlpha);
alphaAnimation.setDuration(ANIMATION_DURATION);
alphaAnimation.setAnimationListener(new
AnimationListener() {
@Override
public void
onAnimationStart(Animation animation) {
staticImageView.setImageResource(imageIdList
.get(currentImageIndex));
}
@Override
public void
onAnimationRepeat(Animation animation) {
}
@Override
public void
onAnimationEnd(Animation animation) {
animationImageView.setImageResource(imageIdList
.get(currentImageIndex));
if
(isContinueLoop) {
handler.postDelayed(new
Runnable() {
@Override
public
void run() {
setAlphaAnimatedImageViewFadeOut();
}
},
DISPLAY_DURATION);
}
}
});
animationImageView.startAnimation(alphaAnimation);
}
public boolean isContinueLoop() {
return isContinueLoop;
}
public void setContinueLoop(boolean
isContinueLoop) {
if ((!(this.isContinueLoop))
&& isContinueLoop) {
this.isContinueLoop
= isContinueLoop;
setAlphaAnimatedImageViewFadeOut();
} else {
this.isContinueLoop
= isContinueLoop;
}
}
public void setImageIdList(List imageIdList)
{
this.imageIdList =
imageIdList;
currentImageIndex = 0;
isContinueLoop = true;
animationImageView.setImageResource(imageIdList.get(currentImageIndex));
handler.postDelayed(new
Runnable() {
@Override
public void
run() {
setAlphaAnimatedImageViewFadeOut();
}
}, DISPLAY_DURATION);
}
}
二、在mainActivity内加载该布局，并向该布局传递需要进行切换的图片list即可，可根据项目需求修改布局参数，以实现自己需要的功能。
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final LinearLayout layout =
(LinearLayout) findViewById(R.id.mlinear);
launch = new
LaunchAppAnimatedBgRelativeLayout(this);
layout.addView(launch);
List imageIdList = new
ArrayList();
imageIdList.add(R.drawable.car2);
imageIdList.add(R.drawable.car3);
imageIdList.add(R.drawable.car4);
imageIdList.add(R.drawable.car7);
imageIdList.add(R.drawable.car8);
imageIdList.add(R.drawable.car9);
launch.setImageIdList(imageIdList);
}
