如何调整图像我从画廊采摘机器人？ [英] How to resize an image i picked from the gallery in android?

问题描述

我建立一个机器人在哪里。内的一个活动，我有一个图像按钮。当我点击它的画廊打开了，我可以选择图像。然后，我设置的图像作为图像按钮的新形象。 现在的问题是图像出现在我的活动方式太大。我怎样才能使它适合我的形象按钮？

 保护无效onActivityResult（INT申请code，INT结果code，意图imageReturnedIntent）{
    super.onActivityResult（要求code，因此code，imageReturnedIntent）;

    开关（要求code）{
    案例SELECT_PHOTO：
        如果（结果code == RESULT_OK）{
            乌里selectedImage = imageReturnedIntent.getData（）;
            的String [] filePathColumn = {MediaStore.Images.Media.DATA};

            光标光标= getContentResolver（）查询（selectedImage，filePathColumn，NULL，NULL，NULL）;
            cursor.moveToFirst（）;

            INT参数：columnIndex = cursor.getColumnIndex（filePathColumn [0]）;
            字符串文件路径= cursor.getString（参数：columnIndex）;
            cursor.close（）;


            位图yourSelectedImage = BitmapFactory.de codeFILE（文件路径）;

            mImageButton.setImageBitmap（yourSelectedImage）;
        }
    }
}
 

解决方案

您可以使用此方法来获得调整后的图像。这样你就可以避免的OutOfMemoryError

 公共静态位图德codeURI（上下文C，开放的URI，最终诠释requiredSize）
            抛出FileNotFoundException异常{
        BitmapFactory.Options O =新BitmapFactory.Options（）;
        o.inJustDe codeBounds = TRUE;
        BitmapFactory.de codeStream（c.getContentResolver（）openInputStream（URI），空，邻。）;

        INT width_tmp = o.outWidth
                ，height_tmp = o.outHeight;
        int标= 1;

        而（真）{
            如果（width_tmp / 2'; requiredSize || height_tmp / 2'; requiredSize）
                打破;
            width_tmp / = 2;
            height_tmp / = 2;
            规模* = 2;
        }

        BitmapFactory.Options O2 =新BitmapFactory.Options（）;
        o2.inSampleSize =规模;
        返回BitmapFactory.de codeStream（c.getContentResolver（）openInputStream（URI），空，O2）;
    }
 

I am building an android where. Inside of one activity I have an image button. When I click on it the gallery opens up and I can choose an image. Then I set that image as the new image for the image button. The problem is the image appears way too big inside my activity. How can I make it fit into my image button?

protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) { 
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent); 

    switch(requestCode) { 
    case SELECT_PHOTO:
        if(resultCode == RESULT_OK){  
            Uri selectedImage = imageReturnedIntent.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};

            Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String filePath = cursor.getString(columnIndex);
            cursor.close();


            Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath);

            mImageButton.setImageBitmap(yourSelectedImage);
        }
    }
}

解决方案

You can use this method to get a resized image. This way you can avoid OutOfMemoryError

public static Bitmap decodeUri(Context c, Uri uri, final int requiredSize) 
            throws FileNotFoundException {
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(c.getContentResolver().openInputStream(uri), null, o);

        int width_tmp = o.outWidth
                , height_tmp = o.outHeight;
        int scale = 1;

        while(true) {
            if(width_tmp / 2 < requiredSize || height_tmp / 2 < requiredSize)
                break;
            width_tmp /= 2;
            height_tmp /= 2;
            scale *= 2;
        }

        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        return BitmapFactory.decodeStream(c.getContentResolver().openInputStream(uri), null, o2);
    }   

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