Glide.with(context).asBitmap().load(url).into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady(@androidx.annotation.NonNull Bitmap resource, @Nullable Transition<? super Bitmap> transition) {
imageView.setImageBitmap(resource);
}
@Override
public void onLoadFailed(Drawable errorDrawable) {
super.onLoadFailed(errorDrawable);
}
});
作用是:下载完成后,把图片显示在你广告图上,由于glide有三级缓存机制,因此,最好是提前在接口返回的时候,进行预加载,然后进入到广告启动的流程中的时候就可以直接复用上一次的bitmap,不会浪费相应的时间。因此思路如下:
接口数据--->开始预加载广告图---》loadSplash---〉加载广告图并且无兜底图
等宽显示广告图:文章来源:https://www.toymoban.com/news/detail-806618.html
public static void scaleImage(final Activity activity, final ImageView view, Bitmap bitmap) {
// 获取屏幕的高宽
Point outSize = new Point();
activity.getWindow().getWindowManager().getDefaultDisplay().getSize(outSize);
// 解析将要被处理的图片
final Bitmap resourceBitmap = bitmap;
if (resourceBitmap == null) {
return;
}
// 开始对图片进行拉伸或者缩放
// 使用图片的缩放比例计算将要放大的图片的高度
final int bitmapScaledHeight = Math.round(resourceBitmap.getHeight() * outSize.x * 1.0f / resourceBitmap.getWidth());
// 以屏幕的宽度为基准,如果图片的宽度比屏幕宽,则等比缩小,如果窄,则放大
final Bitmap scaledBitmap = Bitmap.createScaledBitmap(resourceBitmap, outSize.x, bitmapScaledHeight, false);
//图宽度
Log.e("MainActivity", "resourceBitmap.getHeight:" + resourceBitmap.getHeight());
//图片高度
Log.e("MainActivity", "resourceBitmap.getWidth:" + resourceBitmap.getWidth());
//屏幕宽度
Log.e("MainActivity", "outSize.x:" + outSize.x);
//传入到下面的bitmap
Log.e("MainActivity", "scaledBitmap.getHeight():" + bitmapScaledHeight);
view.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
try {
view.getViewTreeObserver().removeOnPreDrawListener(this);
//这里防止图像的重复创建,避免申请不必要的内存空间
if (scaledBitmap.isRecycled())
//必须返回true
return true;
// 当UI绘制完毕,我们对图片进行处理
int viewHeight = view.getMeasuredHeight();
//最终显示的图片
Bitmap finallyBitmap = null;
Log.e("MainActivity", "viewHeight:" + viewHeight);
//y + height must be <= scaledBitmap.getHeight()
if (scaledBitmap.getHeight() > viewHeight) {
int offset = (scaledBitmap.getHeight() - viewHeight) / 2;// 计算将要裁剪的图片的顶部以及底部的偏移量
int finallyBitmapHeight = scaledBitmap.getHeight() - (offset * 1); // 对图片以中心进行裁剪,裁剪出的图片就是非常适合做引导页的图片了
Log.e("MainActivity", "offset:" + offset);
Log.e("MainActivity", "finallyBitmapHeight:" + finallyBitmapHeight);
finallyBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), finallyBitmapHeight);
} else {
int finallyBitmapHeight = scaledBitmap.getHeight();
Log.e("MainActivity", "finallyBitmapHeight:" + finallyBitmapHeight);
finallyBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), finallyBitmapHeight);
}
if (null != finallyBitmap) {
if (!finallyBitmap.equals(scaledBitmap)) {//如果返回的不是原图,则对原图进行回收
scaledBitmap.recycle();
System.gc();
}
}
// 设置图片显示
view.setImageBitmap(finallyBitmap);
} catch (Exception e) {
Log.e("MainActivity", "图片异常e:" + e.toString());
}
if (resourceBitmap != null && !resourceBitmap.isRecycled())
resourceBitmap.recycle();
return true;
}
});
}
@Override
public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target,
DataSource dataSource, boolean isFirstResource) {
// 得到当前imageView的宽度(我设置的是屏幕宽度),获取到imageView与图片宽的比例,然后通过这个比例去设置imageView的高
ViewGroup.LayoutParams params = mAd.getLayoutParams();
int vw = mAd.getWidth();
float scale = (float) vw / (float) resource.getIntrinsicWidth();
int vh = Math.round(resource.getIntrinsicHeight() * scale);
params.height = vh;
mAd.setLayoutParams(params);
return false;
}
转自:Android 启动白屏优化及公告闪图秒加载 - 简书文章来源地址https://www.toymoban.com/news/detail-806618.html
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