從圖庫中選擇圖像並在圖像視圖中創建縮略圖

Question

我一直在努力使畫廊運作。 部分是因為它是一個片段。 我在此片段中要做的是拾取圖像，在應用程序的文件夾中進行復制，然后將圖像縮放到圖像視圖的縮略圖。 另外，在應用程序的其他部分中使用此圖像，因此請保存圖像的位置。 我正在使用Realm保存該位置。

謝謝您的幫助

這是代碼：

 import android.content.Context; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v7.widget.AppCompatImageView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; import android.content.Intent; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.util.Log; import android.view.View; import com.heinrichreimersoftware.materialintro.slide.FragmentSlide; import io.realm.Realm; public class Step3 extends FragmentSlide.FragmentSlideFragment implements View.OnClickListener { boolean STEP3_PROCEEDABLE = true; private static final int PICK_IMAGE = 1; AppCompatImageView imgView; Button imgButton; private OnFragmentInteractionListener mListener; public Step3(){ //Required empty public constructor } /** * Use this factory method to create a new instance of * this fragment using the provided parameters. */ public static Step3 newInstance() { Step3 fragment = new Step3(); return fragment; } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { final View rootView = inflater.inflate(R.layout.add_routine_slide3, container, false); imgButton = (Button) rootView.findViewById(R.id.imgButton); imgView = (AppCompatImageView) rootView.findViewById(R.id.imgView); imgButton = (Button) inflater.inflate(R.layout.add_routine_slide3, container, false); imgButton.setOnClickListener(this); return rootView; } public void onButtonPressed() { if (mListener != null) { mListener.onFragmentInteraction(STEP3_PROCEEDABLE); } Intent getIntent = new Intent(Intent.ACTION_GET_CONTENT); getIntent.setType("image/*"); Intent pickIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); pickIntent.setType("image/*"); Intent chooserIntent = Intent.createChooser(getIntent, "Select Image"); chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] {pickIntent}); startActivityForResult(chooserIntent, PICK_IMAGE); } @Override public void onAttach(Context context) { super.onAttach(context); if (context instanceof OnFragmentInteractionListener) { mListener = (OnFragmentInteractionListener) context; } else { throw new RuntimeException(context.toString() + " must implement OnFragmentInteractionListener"); } } @Override public void onDetach() { super.onDetach(); mListener = null; } /** * This interface must be implemented by activities that contain this * fragment to allow an interaction in this fragment to be communicated * to the activity and potentially other fragments contained in that * activity. * <p/> * See the Android Training lesson <a href= * "http://developer.android.com/training/basics/fragments/communicating.html" * >Communicating with Other Fragments</a> for more information. */ public interface OnFragmentInteractionListener { void onFragmentInteraction(boolean proceedable); } } 

這是XML

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingBottom="@dimen/activity_vertical_margin"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:layout_gravity="center" android:gravity="center" android:foregroundGravity="center" android:weightSum="1"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Rou_Image" android:textAppearance="?android:attr/textAppearanceLarge" android:gravity="center" /> <TextView android:paddingTop="@dimen/activity_vertical_margin" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Add a picture to capture your routine." android:textAppearance="?android:attr/textAppearanceMedium" android:gravity="center" /> <Button android:text="Select Image" android:layout_width="158dp" android:layout_height="wrap_content" android:id="@+id/imgButton" /> <AppCompatImageView android:layout_width="137dp" android:layout_height="wrap_content" app:srcCompat="@android:drawable/gallery_thumb" android:id="@+id/imgView" android:layout_weight="0.20" /> </LinearLayout> </LinearLayout> 

Answer 1

您可以為此查看Picasso庫。 您可以按照for3st的說明從Storage加載圖像並將其顯示到ImageView。

File f = new File("path-to-file/file.png")
Picasso.with(getActivity()).load(f).into(imageView);

此外，您還可以使用它來縮放圖像

Picasso.with(getActivity()).load(f).resize(100,100).into(imageView);

並將圖像保存在您的應用程序目錄中，您可以像這樣使用它

Bitmap bitmap;
Picasso.with(getActivity()).load(f).resize(100,100).into(imageView, new Callback() {
            @Override
            public void onSuccess() {
                bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap();
            }

            @Override
            public void onError() {
            }
        });
File directory = new File(Environment.getExternalStorageDirectory().toString()+"/MyAppFolder");
if(!directory.exists()){    
   directory.mkdirs();
}
File file = new File(directory,new Random().nextInt(10000)+".png");
            try {
                FileOutputStream fos = new FileOutputStream(file);
                bitmap.compress(Bitmap.CompressFormat.PNG,100,fos);
                fos.flush();
                fos.close();
            }catch (IOException e){e.printStackTrace();}

            //Gallery Refresh
MediaScannerConnection.scanFile(getApplicationContext(), new String[]{Environment.getExternalStorageDirectory().toString()}, null, new MediaScannerConnection.OnScanCompletedListener() {

                public void onScanCompleted(String path, Uri uri) {
                    Log.e("ExternalStorage", "Scanned " + path + ":");
                    Log.e("ExternalStorage", "-> uri=" + uri);
                }
            });

希望這可以幫助。