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我正在尝试从我的 res/drawable 文件夹中加载图像。我使用了 Android Developers Link中的指南。出于某种原因，它不起作用。我得到的唯一错误是“SPAN_EXCLUSIVE_EXCLUSIVE 跨度不能有零长度”，我对此进行了研究。显然它与自定义键盘有关，但我根本没有使用文本输入。应用程序本身不是崩溃。我希望你们能帮助我:) 布局文件只包含一个带有 ImageView 的 RelativeLayout。

public class PixelActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pixel);
    String uri = "@drawable-hdpi/testbild.png";
    final int imageResource = getResources().getIdentifier(uri, null, getPackageName());


    final ImageView iv = (ImageView) findViewById(R.id.imageview1);

    //int imageHeight = options.outHeight;
    //int imageWidth = options.outWidth;
    //String imageType = options.outMimeType;
    new Thread(new Runnable()
    {

        public void run()
        {
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeResource(getResources(), imageResource, options);


            iv.post(new Runnable()
            {

                public void run()
                {
                    iv.setImageBitmap(decodeSampledBitmapFromResources(getResources(),imageResource,iv.getWidth(),iv.getHeight()));
                    //iv.setImageResource(R.drawable.testbild);
                }
            });
        }
    });






}

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

    if(height > reqHeight || width > reqWidth)
    {
        final int heightRatio = Math.round((float)height/(float)reqHeight);
        final int widthRatio = Math.round((float)width/(float)reqWidth);

        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

public static Bitmap decodeSampledBitmapFromResources(Resources res, int resId, int reqWidth, int reqHeight)
{
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    options.inSampleSize = calculateInSampleSize(options,reqWidth,reqHeight);
    options.inJustDecodeBounds = false;

    return BitmapFactory.decodeResource(res, resId, options);
}

}

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1 回答 1

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String uri = "@drawable-hdpi/testbild.png";

那是无效的。删除-hdpi部分和.png部分，然后重试。或者，切换到提供所有三个参数getIdentifier()：

final int imageResource = getResources().getIdentifier("testbild", "drawable", getPackageName());
于 2013-04-23T11:32:59.267 回答