我希望能够通过编程在Android上将图像旋转90度,并裁剪从手机相册中取出的图像。请问如何实现这个操作?
您可以使用以下代码来执行图像的旋转:
Bitmap bMap = BitmapFactory.decodeResource(getResources(),R.drawable.test);
Matrix mat = new Matrix();
mat.postRotate(90);
Bitmap bMapRotate = Bitmap.createBitmap(bMap, 0, 0,
bMap.getWidth(), bMap.getHeight(), mat, true);
BitmapDrawable bmd = new BitmapDrawable(bMapRotate);
image.setImageBitmap(bMapRotate);
image.setImageDrawable(bmd);
如果要从图库中裁剪图片,请使用以下代码片段:
Intent viewMediaIntent = new Intent();
viewMediaIntent.setAction(android.content.Intent.ACTION_VIEW);
File file = new File("/image/*");
viewMediaIntent.setDataAndType(Uri.fromFile(file), "image/*");
viewMediaIntent.putExtra("crop","true");
viewMediaIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivityForResult(viewMediaIntent,1);
private static final String TEMP_PHOTO_FILE = "temporary_holder.jpg";
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
photoPickerIntent.setType("image/*");
photoPickerIntent.putExtra("crop", "true");
photoPickerIntent.putExtra(MediaStore.EXTRA_OUTPUT, getTempUri());
photoPickerIntent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
startActivityForResult(photoPickerIntent, REQ_CODE_PICK_IMAGE);
private Uri getTempUri() {
return Uri.fromFile(getTempFile());
}
private File getTempFile() {
if (isSDCARDMounted()) {
File f = new File(Environment.getExternalStorageDirectory(),TEMP_PHOTO_FILE);
try {
f.createNewFile();
} catch (IOException e) {
}
return f;
} else {
return null;
}
}
private boolean isSDCARDMounted(){
String status = Environment.getExternalStorageState();
if (status.equals(Environment.MEDIA_MOUNTED))
return true;
return false;
}
protected void onActivityResult(int requestCode, int resultCode,
Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch (requestCode) {
case REQ_CODE_PICK_IMAGE:
if (resultCode == RESULT_OK) {
if (imageReturnedIntent!=null){
File tempFile = getTempFile();
String filePath= Environment.getExternalStorageDirectory()
+ "/temporary_holder.jpg";
System.out.println("path "+filePath);
Bitmap selectedImage = BitmapFactory.decodeFile(filePath);
_image = (ImageView) findViewById(R.id.image);
_image.setImageBitmap(selectedImage );
}
}
}