android recenttaskinfo获取应用缩略图

要获取应用程序的缩略图，可以使用以下步骤：

1.获取最近任务列表：

ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RecentTaskInfo> recentTasks = am.getRecentTasks(1, ActivityManager.RECENT_WITH_EXCLUDED);
if (recentTasks != null && recentTasks.size() > 0) {
    ActivityManager.RecentTaskInfo recentTask = recentTasks.get(0);
    if (recentTask != null) {
        Intent intent = recentTask.baseIntent;
        ComponentName componentName = intent.getComponent();
        String packageName = componentName.getPackageName();
    }
}

2.使用PackageManager获取应用程序的图标

PackageManager pm = getPackageManager();
Drawable appIcon = pm.getApplicationIcon(packageName);

3.将Drawable转换为Bitmap

Bitmap appBitmap = ((BitmapDrawable) appIcon).getBitmap();

4.对Bitmap进行缩放

Bitmap scaledBitmap = Bitmap.createScaledBitmap(appBitmap, width, height, true);

5.设置ImageView显示缩略图

imageView.setImageBitmap(scaledBitmap);