调整图像大小会破坏我的应用程序，为什么？

Question

我一直在开发我的照片编辑器 Android 应用程序。从相机捕获图像后，我正在调整图像大小，因为允许将图像保存在 phone

的 Gallery/Photos 中的最大尺寸

以下是JavaActivity代码：

package com.example.photoeditor;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.MediaStore.Images.Media;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import java.io.*;
import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.util.Date;
import java.util.Objects;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;

import static android.Manifest.permission.CAMERA;
import static android.Manifest.permission.READ_EXTERNAL_STORAGE;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
import static android.content.pm.PackageManager.PERMISSION_GRANTED;

public class HomeActivity extends AppCompatActivity {
  private AdView mAdView;
  private static final String TAG = "HomeActivity";
  private static final int GALLERY_RESULT = 1;
  private static final int CAMERA_RESULT = 2;
  private static final String FILE_PROVIDER_AUTHORITY = "com.example.photoeditor";
  private static final int CAMERA_PERMISSION_REQ_CODE = 1001;
  private static final int STORAGE_PERMISSION_REQ_CODE = 1002;

  private String mCapturedImagePath;

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);

    mAdView = (AdView)findViewById(R.id.adView);
    AdRequest adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);
  }

  public void openCamera(View view) {
    // check for camera permission if not granted before
    if (ContextCompat.checkSelfPermission(this, CAMERA) != PERMISSION_GRANTED) {
      String[] cameraPermission = { CAMERA };
      ActivityCompat.requestPermissions(this, cameraPermission, CAMERA_PERMISSION_REQ_CODE);
    } else {
      dispatchImageCaptureIntent();
    }
  }

  public void openGallery(View view) {
    // check for storage permission if not granted before
    if (ContextCompat.checkSelfPermission(this, READ_EXTERNAL_STORAGE) != PERMISSION_GRANTED ||
        ContextCompat.checkSelfPermission(this, WRITE_EXTERNAL_STORAGE) != PERMISSION_GRANTED) {
      String[] storagePermissions = { READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE };
      ActivityCompat.requestPermissions(this, storagePermissions, STORAGE_PERMISSION_REQ_CODE);
    } else {
      dispatchGalleryIntent();
    }
  }

  private void dispatchGalleryIntent() {
    Intent galleryIntent = new Intent(Intent.ACTION_PICK, Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(galleryIntent, GALLERY_RESULT);
  }

  private void dispatchImageCaptureIntent() {
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (cameraIntent.resolveActivity(getPackageManager()) != null) {
      File photoFile = null;
      try {
        photoFile = createImageFile();
      } catch (IOException e) {
        e.printStackTrace();
      }

      if (photoFile != null) {
        Uri photoFileUri = FileProvider.getUriForFile(this, FILE_PROVIDER_AUTHORITY, photoFile);
        Log.d(TAG, "dispatchImageCaptureIntent:photoFileUri: " + photoFile.toString());
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoFileUri);
        startActivityForResult(cameraIntent, CAMERA_RESULT);
      }
    }
  }

  @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
      @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
      case CAMERA_PERMISSION_REQ_CODE:
        if (grantResults[0] == PERMISSION_GRANTED) {
          dispatchImageCaptureIntent();
        } else {
          Toast.makeText(this, "Required camera permission not granted", Toast.LENGTH_SHORT).show();
        }
        break;

      case STORAGE_PERMISSION_REQ_CODE:
        if (grantResults[0] == PERMISSION_GRANTED) {
          dispatchGalleryIntent();
        } else {
          Toast.makeText(this, "Required storage permission not granted", Toast.LENGTH_SHORT)
              .show();
        }
        break;

      default:
        throw new IllegalArgumentException("Unexpected request code");
    }
  }

  private File createImageFile() throws IOException {
    String timeStamp = DateFormat.getDateTimeInstance().format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(imageFileName, ".jpg", storageDir);
    mCapturedImagePath = image.getAbsolutePath();
    Log.d(TAG, "createImageFile: " + mCapturedImagePath);
    return image;
  }

  private Bundle uriToBundle(Uri imageUri) {
    Bundle bundle = new Bundle();
    bundle.putString(MainActivity.IMAGE_URI, imageUri.toString());
    return bundle;
  }

  @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
      if (requestCode == GALLERY_RESULT) {
        Uri imageUri = data.getData();
        startActivity(MainActivity.getIntent(this, uriToBundle(Objects.requireNonNull(imageUri))));
      } else if (requestCode == CAMERA_RESULT) {
          File imageFile = new File(mCapturedImagePath);
          Bitmap image = BitmapFactory.decodeFile(mCapturedImagePath);
          image = Bitmap.createScaledBitmap(image, 100, 100, false);
          ByteArrayOutputStream bytes = new ByteArrayOutputStream();
          image.compress(Bitmap.CompressFormat.JPEG, 60, bytes);

          try {
              File file = new File(Environment.getExternalStorageDirectory() + File.separator + "filename.jpg");
              boolean result;
              result = file.createNewFile();
              if (result) {
                FileOutputStream fo = new FileOutputStream(imageFile);
                fo.write(bytes.toByteArray());
                fo.close();
              }
          } catch(IOException ie) {
              ie.printStackTrace();
          }
      }
    } else {
      Toast.makeText(this, "Image not loaded.", Toast.LENGTH_SHORT).show();
    }
  }

  public static Intent getIntent(Context context) {
    return new Intent(context, HomeActivity.class);
  }
}

所以当我捕获图像然后当用户被带到编辑应用程序时，它不会，它会在捕获图像后再次将我带回主页

你能告诉我哪里错了吗？

提前致谢

Answer 1

您忘记在 onActivityResult() 的 CAMERA_RESULT 区块条件下调用 start activity。

----- 编辑 1 -----

与他交谈后，在 onActivityResult().

的 CAMERA_RESULT 块的条件下添加 startActivity() 解决了问题

startActivity(MainActivity.getIntent(this, uriToBundle(Objects.requireNonNull(imageToUploadUri))));

这是我修复的代码，有关更多信息，请参阅代码中的注释。

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            if (requestCode == GALLERY_RESULT) {
                Uri imageUri = data.getData();
                startActivity(MainActivity.getIntent(this, uriToBundle(Objects.requireNonNull(imageUri))));
            } else if (requestCode == CAMERA_RESULT) {

                //Reducing Image Size
                File imageFile = new File(mCapturedImagePath);
                Bitmap image = BitmapFactory.decodeFile(mCapturedImagePath);
                image = Bitmap.createScaledBitmap(image, 300, 300, false);
                ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                image.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

                //This section is needed as you need to replace the image got from camera with reduced bitmap.
                //So that you just only need to carry URI not the bitmap.
                try {
                    File file = new File(Environment.getExternalStorageDirectory() + File.separator + "filename.jpg");
                    boolean result;
                    result = file.createNewFile();
                    if (result) {
                        FileOutputStream fo = new FileOutputStream(imageFile);
                        fo.write(bytes.toByteArray());
                        fo.close();
                    }
                } catch(IOException ie) {
                    ie.printStackTrace();
                }

                // Here's the main point.
                // You need to start MainActivity as bitmap has been processed.
                startActivity(MainActivity.getIntent(this, uriToBundle(Objects.requireNonNull(imageToUploadUri))));

            }
        } else {
            Toast.makeText(this, "Image not loaded.", Toast.LENGTH_SHORT).show();
        }
    }

调整图像大小会破坏我的应用程序，为什么？

Resizing an image is breaking my app why?

java

android

adobecreativesdk

photoeditorsdk