在Android Lollipop中从Uri裁剪照片后返回的总是空？

Question

public static void cropImage(Uri uri, Activity activity, int action_code) {
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image/*");
    intent.putExtra("crop", "true");
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    intent.putExtra("outputX", 600);
    intent.putExtra("outputY", 600);
    intent.putExtra("scale", true);
    intent.putExtra("return-data", true);
    if (intent.resolveActivity(activity.getPackageManager()) != null) {
        activity.startActivityForResult(intent, action_code);
    } else {
        Toast.makeText(activity, "No Crop App Available", Toast.LENGTH_SHORT).show();
    }
}

并重写OnActivityResult()，如下所示：

if (resultCode == Activity.RESULT_OK && requestCode == Utils.CODE_CROP_IMAGE) {
    Bundle extras = data.getExtras();
    showCenterToast("ccc");
    if (extras != null) {
        showCenterToast("CCC");
        Bitmap photo = extras.getParcelable("data");
        ivAvatar.setImageBitmap(photo); // display image in ImageView
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(Utils.AVATAR_FILE);
            photo.compress(Bitmap.CompressFormat.PNG, 100, fos);// (0-100)compressing file
            showCenterToast("DDD");
            Utils.AVATAR_FILE_TMP.delete();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
           IoUtil.closeSilently(fos);
        }
    }
}

在Android Pre-Lollipop的设备上，我能够获得位图照片并将其显示在ImageView中。但是，在Android Lollipop上，我总是从data.getExtras（）；得到null。

我在谷歌上搜索了很多，但关于在AndroidLollipop上裁剪图像的有用信息很少。

Answer 1

我认为你的问题与Android版本无关，而是你想要裁剪的图像。在类com.android.gallery3d.filtershow.crop.cropActivity#BitmapioTask中处理的裁剪图像。当图像太大无法返回时，它会尝试返回图像的thumb，有时会返回null。为了避免这种情况，您可以通过设置intent.putextra（纵隔.extra_output,tmpUri）；来获得裁剪图像的uri，而不是位图，其中tmpUri是为保存结果而创建的uri。然后您可以从tmpuri中获取位图。

示例代码：

private static final String IMAGE_FILE_LOCATION = "file:///sdcard/temp.jpg";//temp file
private static Uri tmpUri = Uri.parse(IMAGE_FILE_LOCATION);//The Uri to store the big bitmap

public static void cropImage(Uri uri, Activity activity, int action_code) {
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(uri, "image/*");
    intent.putExtra("crop", "true");
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    intent.putExtra("outputX", 600);
    intent.putExtra("outputY", 600);
    intent.putExtra("scale", true);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, tmpUri);
    if (intent.resolveActivity(activity.getPackageManager()) != null) {
        activity.startActivityForResult(intent, action_code);
    } else {
        Toast.makeText(activity, "No Crop App Available", Toast.LENGTH_SHORT).show();
    }
}

并且在函数OnActivityResult中：

if (resultCode == Activity.RESULT_OK && requestCode == Utils.CODE_CROP_IMAGE) {
    // Bundle extras = data.getExtras();
    Uri uri = data.getData();
    showCenterToast("ccc");
    if (uri != null) {
        showCenterToast("CCC");
        // Bitmap photo = null;
        // if (tmpUri != null) {
        //     photo = decodeBitmapFromUri(tmpUri); // Get bitmap from uri.
        // }

        Bitmap photo = decodeUriAsBitmap(uri);
        ivAvatar.setImageBitmap(photo); // display image in ImageView
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(Utils.AVATAR_FILE);
            photo.compress(Bitmap.CompressFormat.PNG, 100, fos);// (0-100)compressing file
            showCenterToast("DDD");
            Utils.AVATAR_FILE_TMP.delete();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
           IoUtil.closeSilently(fos);
        }
    } else {
        showCenterToast("Uri is NULL");
    }
}

private Bitmap decodeUriAsBitmap(Uri uri){
    Bitmap bitmap = null;
    try {
        bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return null;
    }
    return bitmap;
}