Question

我在android中实现了代码从图库中选择图像并在imageview中裁剪图像但裁剪后的图像非常模糊，如何显示裁剪后的图像

这是我的代码：

ImageSelecter.java

public class ImageSelecter extends Activity {

private final int GALLERY_ACTIVITY_CODE=200;
private final int RESULT_CROP = 400;
String picturePath;
ImageView image_capture1;
Button btn_choose;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn_choose=(Button)findViewById(R.id.choose_btn);
    image_capture1=(ImageView)findViewById(R.id.img);
    btn_choose.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            //Start Activity To Select Image From Gallery
            Intent gallery_Intent = new Intent(getApplicationContext(), GalleryUtil.class);
            startActivityForResult(gallery_Intent, GALLERY_ACTIVITY_CODE);
           }
         });

       }

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == GALLERY_ACTIVITY_CODE) {
        if(resultCode == Activity.RESULT_OK){
            picturePath = data.getStringExtra("picturePath");
            //perform Crop on the Image Selected from Gallery
            performCrop(picturePath);
        }
    }

    if (requestCode == RESULT_CROP ) {
        if(resultCode == Activity.RESULT_OK){
            Bundle extras = data.getExtras();
            Bitmap selectedBitmap = extras.getParcelable("data");

            // Set The Bitmap Data To ImageView
            image_capture1.setImageBitmap(selectedBitmap);
              image_capture1.setScaleType(ImageView.ScaleType.FIT_XY);
        }
    }
}

private void performCrop(String picUri) {
    try {
        //Start Crop Activity

        Intent cropIntent = new Intent("com.android.camera.action.CROP");
        // indicate image type and Uri
        File f = new File(picUri);
        Uri contentUri = Uri.fromFile(f);

        cropIntent.setDataAndType(contentUri, "image/*");
        // set crop properties
        cropIntent.putExtra("crop", "true");
        // indicate aspect of desired crop
        cropIntent.putExtra("aspectX", 1);
        cropIntent.putExtra("aspectY", 1);
        // indicate output X and Y
        cropIntent.putExtra("outputX", 280);
        cropIntent.putExtra("outputY", 280);

        // retrieve data on return
        cropIntent.putExtra("return-data", true);
        // start the activity - we handle returning in onActivityResult
        startActivityForResult(cropIntent, RESULT_CROP);
    }
    // respond to users whose devices do not support the crop action
    catch (ActivityNotFoundException anfe) {
        // display an error message
        String errorMessage = "your device doesn't support the crop action!";
        Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
        toast.show();
    }
}
}

显示图库类的类如下

GalleryUtil.java

    public class GalleryUtil extends Activity {
    private final static int RESULT_SELECT_IMAGE = 100;
    public static final int MEDIA_TYPE_IMAGE = 1;
    private static final String TAG = "GalleryUtil";

    String mCurrentPhotoPath;
    File photoFile = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    try{
        //Pick Image From Gallery
        Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(i, RESULT_SELECT_IMAGE);
    }catch(Exception e){
        e.printStackTrace();
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    switch(requestCode){
        case RESULT_SELECT_IMAGE:

            if (resultCode == Activity.RESULT_OK && data != null && data.getData() != null) {
                try{
                    Uri selectedImage = data.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 picturePath = cursor.getString(columnIndex);
                    cursor.close();

                    //return Image Path to the Main Activity
                    Intent returnFromGalleryIntent = new Intent();
                    returnFromGalleryIntent.putExtra("picturePath",picturePath);
                    setResult(RESULT_OK,returnFromGalleryIntent);
                    finish();
                }catch(Exception e){
                    e.printStackTrace();
                    Intent returnFromGalleryIntent = new Intent();
                    setResult(RESULT_CANCELED, returnFromGalleryIntent);
                    finish();
                }
            }else{
                Log.i(TAG,"RESULT_CANCELED");
                Intent returnFromGalleryIntent = new Intent();
                setResult(RESULT_CANCELED, returnFromGalleryIntent);
                finish();
            }
            break;
    }
}
   }

请提供解决方案，以便按原样显示裁剪后的图像。

Answer 1

将您的ImageView.ScaleType.FIT_XY更改为ImageView.ScaleType.CENTER_INSIDE。

或其他合适的ScaleType，例如FIT_CENTER/CENTER_CROP/CENTER。

当我在android中选择并裁剪图像时，图像质量会发生变化（模糊）

1 个答案: