Android下载网络图片

发表于 2017-08-27 阅读次数：

下载网络图片

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// 第一步：根据流得到bitmap
// 方案1
Bitmap bitmap = Glide.with(applicationContext)
        .load(url)
        .asBitmap()
        .into(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL)
        .get();
// 方案2
Bitmap bitmap = BitmapFactory.decodeStream(new URL(url).openStream());

// 压缩图片
// bitmap = Bitmap.createScaledBitmap(bitmap, 120, 120, true);

// 第二步：保存成文件
// 保存图片
File imgDir = new File(getDiskCacheDir(applicationContext), "image_caches");
if (!imgDir.exists()) {
    imgDir.mkdirs();
}
File imgFile = new File(imgDir, fileName);
fileOutputStream = new FileOutputStream(imgFile);
Bitmap.CompressFormat compressFormat = Bitmap.CompressFormat.PNG;
bitmap.compress(compressFormat, 100, fileOutputStream);
fileOutputStream.flush();

Glide预加载图片

public static void preloadImage(Context context, AdZone adZone) {
    for (AdZone.Item item : adZone.getItems()) {
        new Thread(() -> {
            try {
                Glide.with(context.getApplicationContext())
                        .load(item.getPic())
                        .downloadOnly(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL)
                        .get();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }).start();
    }
}

Glide.with(getApplicationContext())
    .load(pic)
    .diskCacheStrategy(DiskCacheStrategy.ALL)
    .into(new GlideDrawableImageViewTarget(ivWelcome) {
        @Override
        protected void setResource(GlideDrawable resource) {
            // https://github.com/bumptech/glide/issues/275
            super.setResource(resource);

            ivWelcome.setOnClickListener(v -> {
                sendAdZoneItemBroadcast(item);
            });
            ivWelcome.setVisibility(View.VISIBLE);

            // set countDown
            toCountDown();
        }

        @Override
        public void onLoadFailed(Exception e, Drawable errorDrawable) {
            super.onLoadFailed(e, errorDrawable);
        }
    });

主要介绍Android图片OutOfMemory异常bitmap size exceeds VM budget的原因及解决方法，顺带提及Dalvik heap size

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