启动具有大背景的新活动时崩溃应用程序

Question

当我尝试点击按钮移动到第二个活动时，应用程序崩溃（不幸的是应用已经停止）。使用背景图像创建主Activity和第二个Activity。

我尝试删除背景并将其替换为mipmap，以便应用程序运行良好而不会崩溃。我不知道为什么？ PS：背景的大小jpg = 70kb和80kb。

Answer 1

正如您所描述的，我猜例外是OutOfMemory例外。将大图像加载到活动中时，这是一个众所周知的问题。您应该在加载到ImageView

之前缩小该图像

以下是从Loading Large Bitmaps Efficiently

获取的示例代码

public static int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        final int halfHeight = height / 2;
        final int halfWidth = width / 2;

        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / inSampleSize) >= reqHeight
                && (halfWidth / inSampleSize) >= reqWidth) {
            inSampleSize *= 2;
        }
    }

    return inSampleSize;
}

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
        int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}