我创建了一个带有 imageView 和两个按钮的基本 Activity 。 1 个按钮打开图库，另一个按钮打开相机。两者都将结果传递到图像裁剪库中。裁剪后的图像被保存并显示在 imageView 中。
首先，我使用任一按钮执行此操作，一切正常。然而，在第二次尝试时，imageView 没有被替换，但已保存的图像已更改。
所以基本上，如果 imageView 已经有了第一个结果，它就不会更改为新图像。
代码如下:
public void takeDisplayPicture(View view) {
final String TAKE_DISPLAY_PICTURE = "Take Display Picture";
Log.d(TAKE_DISPLAY_PICTURE, "Clicked");
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException e) {
Log.e(TAKE_DISPLAY_PICTURE, "Error Occurred");
}
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(photoFile));
Log.d(TAKE_DISPLAY_PICTURE, photoFile.getAbsolutePath());
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
} else {
Log.d(TAKE_DISPLAY_PICTURE, "No Camera");
Toast.makeText(getApplicationContext(),"No Camera Available",Toast.LENGTH_SHORT).show();
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent result) {
final String ON_ACTIVITY_RESULT = "On Activity Result";
Log.d(ON_ACTIVITY_RESULT, "Triggered");
Log.d(ON_ACTIVITY_RESULT, "Request Code: "+Integer.toString(requestCode)+" Result Code: "+Integer.toString(resultCode));
Uri img = Uri.parse("file:///"+Config.APP_PATH+Config.APP_USER_PATH+"/"+Config.DISPLAY_PICTURE_NAME+".png");
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Log.d(ON_ACTIVITY_RESULT, "Beginning Crop");
Log.d(ON_ACTIVITY_RESULT,img.toString());
beginCrop(img, img);
} else if (requestCode == Crop.REQUEST_CROP) {
Log.d(ON_ACTIVITY_RESULT, "Handling Crop");
handleCrop(resultCode, result);
} else if (requestCode == 2){
Log.d(ON_ACTIVITY_RESULT, "Gallery Image Returned");
File file = new File(img.getPath());
file.delete();
Uri src = result.getData();
Log.d(ON_ACTIVITY_RESULT, src.toString());
beginCrop(src, img);
}
}
private void beginCrop(Uri source, Uri output){
final String BEGIN_CROP = "Begin Crop";
Log.d(BEGIN_CROP, "Beginning");
new Crop(source).output(output).asSquare().start(this);
}
private void handleCrop(int resultCode, Intent result) {
final String HANDLE_CROP = "Handle Crop";
if (resultCode == RESULT_OK) {
Log.d(HANDLE_CROP, "Set ImageView");
displayPicture.setImageURI(Crop.getOutput(result));
try {
bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Crop.getOutput(result));
} catch (Exception e ){
Log.d(HANDLE_CROP, "Error Occurred");
}
} else if (resultCode == Crop.RESULT_ERROR) {
Log.d(HANDLE_CROP, "Error Occurred");
}
}
String currentPhotoPath;
private File createImageFile() throws IOException {
final String CREATE_IMAGE_FILE = "Create Image File";
String fileName = "display_picture";
File dir = new File(Config.APP_PATH+Config.APP_USER_PATH);
dir.mkdirs();
File image = new File(dir,fileName+".png");
return image;
}
public void chooseFromGallery(View view) {
final String CHOOSE_FROM_GALLERY = "Choose From Gallery";
Log.d(CHOOSE_FROM_GALLERY, "Clicked");
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);
}
最佳答案
如果您阅读 setImageURI:
if (mResource != 0 ||
(mUri != uri &&
(uri == null || mUri == null || !uri.equals(mUri)))) {
//Set URI...
}
基本上，setImageURI 仅在图像的 Uri 不等于您当前要设置的 Uri 时才起作用。您的按钮第二次不起作用，因为每次按下按钮时 Crop.getOutput(result) 都会返回相同的 Uri，因此 setImageURI 什么都不做。
要解决这个问题，可以在 displayPicture.setImageURI(Crop.getOutput(result)); 之前添加 displayPicture.setImageURI(null);。
关于android - 裁剪后设置 ImageView 不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29061283/