Question

此代码允许用户在其图库中选择一个图像并将其裁剪以将其放入imageview。但是每次我离开该应用程序并再次打开它时，该图像都不再存在，因此我想将uri由用户裁剪的图像保存到共享的首选项中，以使其持久。

请像实施cele一样！

选择图像：

permissionsCheck();
    Intent intent = new Intent();

    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);

    startActivityForResult(Intent.createChooser(intent, "Complete action using"), PICK_FROM_FILE);

裁剪图像：

private void doCrop() {
    final ArrayList<CropOption> cropOptions = new ArrayList<CropOption>();
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setType("image/*");

    List<ResolveInfo> list = getPackageManager().queryIntentActivities( intent, 0 );

    int size = list.size();
    if (size == 0) {
        Toast.makeText(this, "Can not find image crop app", Toast.LENGTH_SHORT).show();

        return;
    } else {
        intent.setData(mImageCaptureUri);

        intent.putExtra("outputX", 100);
        intent.putExtra("outputY", 100);
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        intent.putExtra("scale", false);
        intent.putExtra("return-data", true);

        if (size == 1) {
            Intent i        = new Intent(intent);
            ResolveInfo res = list.get(0);
            i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
            startActivityForResult(i, CROP_FROM_CAMERA);
        } else {
            for (ResolveInfo res : list) {
                final CropOption co = new CropOption();
                co.title    = getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);
                co.icon     = getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);
                co.appIntent= new Intent(intent);
                co.appIntent.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
                cropOptions.add(co);
            }

            CropOptionAdapter adapter = new CropOptionAdapter(getApplicationContext(), cropOptions);

            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("Choose Crop App");
            builder.setAdapter( adapter, new DialogInterface.OnClickListener() {
                public void onClick( DialogInterface dialog, int item ) {
                    startActivityForResult( cropOptions.get(item).appIntent, CROP_FROM_CAMERA);
                }
            });

            builder.setOnCancelListener( new DialogInterface.OnCancelListener() {
                @Override
                public void onCancel( DialogInterface dialog ) {

                    if (mImageCaptureUri != null ) {
                        getContentResolver().delete(mImageCaptureUri, null, null );
                        mImageCaptureUri = null;
                    }
                }
            } );

            AlertDialog alert = builder.create();

            alert.show();
        }
    }
}

激活结果：

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != RESULT_OK) return;

    switch (requestCode) {
        case PICK_IMAGE:
            mImageCaptureUri = data.getData();
            doCrop();
            break;
        case CROP_FROM_CAMERA:
            Bundle extras = data.getExtras();
            if (extras != null) {
                Bitmap photo = extras.getParcelable("data");
                imageView.setImageBitmap(photo);
                String root = Environment.getExternalStorageDirectory().toString();
                File myDir = new File(root + "/saved_images");
                myDir.mkdirs();
                Random generator = new Random();
                int n = 100000;
                n = generator.nextInt(n);
                String fname = "Image-"+ n +".jpg";
                File file = new File (myDir, fname);
                if (file.exists ()) file.delete ();
                try {
                    FileOutputStream out = new FileOutputStream(file);
                    photo.compress(Bitmap.CompressFormat.JPEG, 90, out);
                    out.flush();
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
                SharedPreferences.Editor editor = preferences.edit();
                editor.putString("image", String.valueOf(mImageCaptureUri));
                editor.commit();

                imageView.setImageURI(mImageCaptureUri);
                imageView.invalidate();
            }
            File f = new File(mImageCaptureUri.getPath());
            if (f.exists()) f.delete();
            break;

    }
}

Answer 1

请不要将图像保存到Preferences中，它不是用于存储大量数据的存储区，请将裁剪后的图像另存为.jpg或.png到您的数据文件夹中图片，并在您的首选项中存储该裁剪图片文件的URI或路径。

然后，您将能够检查路径是否存储在首选项中，并在应用程序启动时加载裁剪的图片。

好的，我再次检查了您的源代码。在onActivityResult()中，您有一个变量mImageCaptureUri-将该变量保存到Preferences中。重新启动应用程序时，请使用该变量访问图像并以与原始图像相同的方式再次对其进行裁剪。

在共享首选项中选择，裁剪和保存uri图像

1 个答案: