通过在 Android 中传递图像文件路径来裁剪图像

Question

我已经尝试了下面的代码。但是，它总是产生 160*160 尺寸的图像。

try {   
    //call the standard crop action intent (the user device may not support it)
    Intent cropIntent = new Intent("com.android.camera.action.CROP");
    //indicate image type and Uri
    cropIntent.setDataAndType(Uri.fromFile(pictureFile), "image/*");
    //set crop properties
    cropIntent.putExtra("crop", "true");
    //indicate aspect of desired crop
    cropIntent.putExtra("aspectX", 100);
    cropIntent.putExtra("aspectY", 100);
    cropIntent.putExtra("scale", true);

    //indicate output X and Y
    cropIntent.putExtra("outputX", 500);
    cropIntent.putExtra("outputY", 500);
    //retrieve data on return
    cropIntent.putExtra("return-data", true);
    //start the activity - we handle returning in onActivityResult
    startActivityForResult(cropIntent, CROP_IMAGE);

} catch(ActivityNotFoundException anfe) {
    //display an error message
    String errorMessage = "Whoops - your device doesn't support the crop action!";
    Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
    toast.show();

}

我想通过传递路径来裁剪图像。 我不想从默认相机应用程序或图库中捕获/选择。请帮我解决这个问题。

Answer 1

这样就可以缩放图片了：

Bitmap.createScaledBitmap(bitmap,50,50,true);

Answer 2

我通过在调用 Intent 之前创建一个新文件并传递此文件路径以通过 Intent 存储裁剪的图像来解决此问题。这是解决此问题的方法。

private Uri mCropImagedUri;
private final int CROP_IMAGE = 100;//unique request code number. Which is used to identify the request result in onActivityResult()
/**Crop the image
 * @return returns <tt>true</tt> if crop supports by the device,otherwise false*/
private boolean performCropImage(){
    try {
        if(mFinalImageUri!=null){
            //call the standard crop action intent (the user device may not support it)
            Intent cropIntent = new Intent("com.android.camera.action.CROP");
            //indicate image type and Uri
            cropIntent.setDataAndType(mFinalImageUri, "image/*");
            //set crop properties
            cropIntent.putExtra("crop", "true");
            //indicate aspect of desired crop
            cropIntent.putExtra("aspectX", 1);
            cropIntent.putExtra("aspectY", 1);
            cropIntent.putExtra("scale", true);
            //indicate output X and Y
            cropIntent.putExtra("outputX", 500);
            cropIntent.putExtra("outputY", 500);
            //retrieve data on return
            cropIntent.putExtra("return-data", false);

            File f = createNewFile("CROP_");
            try {
                f.createNewFile();
            } catch (IOException ex) {
                VLLog.e("io", ex.getMessage());  
            }

            mCropImagedUri = Uri.fromFile(f);
            cropIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCropImagedUri);
            //start the activity - we handle returning in onActivityResult
            startActivityForResult(cropIntent, CROP_IMAGE);
            return true;
        }
    }
    catch(ActivityNotFoundException anfe){
        //display an error message
        String errorMessage = "Whoops - your device doesn't support the crop action!";
        Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
        toast.show();
        return false;
    }
    return false;
}

private File createNewFile(String prefix){
    if(prefix==null || "".equalsIgnoreCase(prefix)){
        prefix="IMG_";
    }
    File newDirectory = new File(Environment.getExternalStorageDirectory()+"/mypics/");
    if(!newDirectory.exists()){
        if(newDirectory.mkdir()){
            VLLog.d(mContext.getClass().getName(), newDirectory.getAbsolutePath()+" directory created");
        }
    }
    File file = new File(newDirectory,(prefix+System.currentTimeMillis()+".jpg"));
    if(file.exists()){
        //this wont be executed
        file.delete();
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return file;
}

所以这里我们不应该关心onActivityResult()方法中的数据。

这里是关于裁剪图像的完整信息。我已经用这个来解决了。 http://www.androidworks.com/crop_large_photos_with_android

Answer 3

Android 不支持内置的裁剪 Intent。您不应假设它可用。

您应该使用自己的解决方案，或者使用第三方库，例如：

https://github.com/ArthurHub/Android-Image-Cropper

在此处了解更多信息：

https://commonsware.com/blog/2013/01/23/no-android-does-not-have-crop-intent.html