Question

我是位图，缩小版和Java的新手，所以请比平常更深入地解释一下。谢谢。洛尔

我的问题：我正在尝试缩小图像以删除那令人讨厌的“Java.lang.OutOfMemory”错误！当我尝试缩减时，当我启动应用程序时，而不是那里的图像，那里没有图像。

也许你可以帮忙:)。

我的两个方法：

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);
}

和我的onCreate方法（我确定这是一个非常愚蠢的错误，所以请对我轻松一点（对不起））：

ImageView image9View;
ImageView image8View;
ImageView image7View;
ImageView image6View;
ImageView image5View;
ImageView image4View;
ImageView image3View;
ImageView image2View;
ImageView image1View;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);




    image9View = (ImageView)findViewById(R.id.faqImage);
    image8View = (ImageView)findViewById(R.id.foodIcon);
    image7View = (ImageView)findViewById(R.id.bracketsIcon);
    image6View = (ImageView)findViewById(R.id.teamsIcon);
    image5View = (ImageView)findViewById(R.id.playersIcon);
    image4View = (ImageView)findViewById(R.id.gamesIcon);
    image3View = (ImageView)findViewById(R.id.homeIcon);
    image2View = (ImageView)findViewById(R.id.settingsIcon);
    image1View = (ImageView)findViewById(R.id.alert);


    image9View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.faqImage, 50, 50));
    image8View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.foodIcon, 50, 50));
    image7View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.bracketsIcon, 50, 50));
    image6View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.teamsIcon, 50, 50));
    image5View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.playersIcon, 50, 50));
    image4View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.gamesIcon, 50, 50));
    image3View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.homeIcon, 50, 50));
    image2View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.settingsIcon, 50, 50));
    image1View.setImageBitmap(
            decodeSampledBitmapFromResource(getResources(), R.id.alert, 50, 50));}

问题？我不知道。我是新手，所以我问你。谢谢:)）

Answer 1

代码几乎没问题，你混淆了#id;查看ID＆＃39; （R.id.stuff_i_defined_in_xml）和＆＃39;资源ID＆＃39; （例如R.drawable.my_png_file）。试试：

image9View.setImageBitmap(
        decodeSampledBitmapFromResource(getResources(), R.drawable.faqImage, 50, 50));

确保您有一个名为＆＃34; faqImage.png＆＃34;的文件。在drawables文件夹中（res / drawable *之一）。

Android Bitmap缩小不起作用

1 个答案: