android-studio - 我无法在缩略图中显示捕获的图像
问题描述
这是一项课堂作业,我今天需要完成它。所以基本上捕获的图像被保存,但它不会显示在打开的 imgVpic imageview 相机中,并且捕获的图像以正确的文件名正确保存,但它不会显示在我设置的缩略图中,我在图库中检查并且图片在那里但是再次..图像不会显示在这个 imgVpic 图像视图中(我一直重复这个原因我不能在没有“更多细节”的情况下发布这个问题,因为我的帖子主要是代码,请帮助我是学生,我讨厌我的老师)
这是我使用的代码
公共类 CaptureImgActivity 扩展 AppCompatActivity {
final int CAMERA_RESULT=0;
Uri imgUri=null;
Button btTakePic;
ImageView imgVPic;
private void CaptureImageUri(){
String dir= Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DCIM).getAbsolutePath();
File folder=new File(dir + File.separator+"test");
boolean success=true;
if (!folder.exists()){
try {
success=folder.mkdir();
Toast.makeText(this,"Folder Create Successfull", Toast.LENGTH_SHORT).show();
}catch (Exception e){
success = !success;
e.printStackTrace();
}
}
if (success){
dir=dir+ File.separator+"test";
}
Calendar calendar=Calendar.getInstance();
File file= new File(dir,"test"+(calendar.getTimeInMillis()+".jpg"));
if (!file.exists()){
try {
file.createNewFile();
imgUri= FileProvider.getUriForFile(CaptureImgActivity.this,BuildConfig.APPLICATION_ID,file);
Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT,imgUri);
startActivityForResult(intent,CAMERA_RESULT);
}catch (Exception e){
e.printStackTrace();
}
}else {
try {
file.delete();
file.createNewFile();
imgUri= FileProvider.getUriForFile(CaptureImgActivity.this,BuildConfig.APPLICATION_ID,file);
Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT,imgUri);
startActivityForResult(intent,CAMERA_RESULT);
}catch (Exception e){
e.printStackTrace();
}
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
if (requestCode == CAMERA_RESULT && requestCode == RESULT_OK){
try {
Uri imgUri=data.getData();
Bitmap bitmap= MediaStore.Images.Media.getBitmap(this.getContentResolver(),imgUri);
imgVPic.setImageBitmap(bitmap);
}catch (FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_capture_img);
btTakePic = (Button) findViewById(R.id.btTakePic);
imgVPic = (ImageView) findViewById(R.id.imgVPic);
btTakePic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CaptureImageUri();
}
});
}
}
解决方案
我尝试了两种方法,例如从图库中选择图像和通过添加捕获图像
android:requestLegacyExternalStorage="true"
我的代码与您的不同,但过程相同,但这对我有用
Uri imgUri=null;
protected static final int CAMERA_REQUEST = 0;
protected static final int GALLERY_PICTURE = 1;
private Intent pictureActionIntent = null;
Bitmap bitmap;
String selectedImagePath;
private void SelectImage() {
AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(
getActivity());
myAlertDialog.setTitle("Upload Pictures Option");
myAlertDialog.setMessage("How do you want to set your picture?");
myAlertDialog.setPositiveButton("Gallery",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
Intent pictureActionIntent = null;
pictureActionIntent = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(
pictureActionIntent,
GALLERY_PICTURE);
}
});
myAlertDialog.setNegativeButton("Camera",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(android.os.Environment.getExternalStorageDirectory(), "temp.jpg");
imgUri= FileProvider.getUriForFile(Objects.requireNonNull(getContext()), BuildConfig.APPLICATION_ID + ".provider", file);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);
startActivityForResult(intent, CAMERA_REQUEST);
}
});
myAlertDialog.show();
}
活动结果
@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
bitmap = null;
selectedImagePath = null;
if (resultCode == RESULT_OK && requestCode == CAMERA_REQUEST) {
File f = new File(Environment.getExternalStorageDirectory()
.toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("temp.jpg")) {
f = temp;
break;
}
}
if (!f.exists()) {
Toast.makeText(getContext(), "Error while capturing image", Toast.LENGTH_LONG).show();
return;
}
try {
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath());
bitmap = Bitmap.createScaledBitmap(bitmap, 400, 400, true);
int rotate = 0;
try {
ExifInterface exif = new ExifInterface(f.getAbsolutePath());
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
rotate = 270;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotate = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
rotate = 90;
break;
}
} catch (Exception e) {
e.printStackTrace();
}
Matrix matrix = new Matrix();
matrix.postRotate(rotate);
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
bitmap.getHeight(), matrix, true);
mImageView.setImageBitmap(bitmap);
//storeImageTosdCard(bitmap);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else if (resultCode == RESULT_OK && requestCode == GALLERY_PICTURE) {
if (data != null) {
Uri selectedImage = data.getData();
String[] filePath = { MediaStore.Images.Media.DATA };
Cursor c = getActivity().getContentResolver().query(selectedImage, filePath,
null, null, null);
c.moveToFirst();
int columnIndex = c.getColumnIndex(filePath[0]);
selectedImagePath = c.getString(columnIndex);
c.close();
bitmap = BitmapFactory.decodeFile(selectedImagePath); // load
mImageView.setImageBitmap(bitmap);
} else {
Toast.makeText(getContext(), "Cancelled",
Toast.LENGTH_SHORT).show();
}
}
}
两种方法都适用于我并显示缩略图
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