Question

我使用相机意图让用户捕捉照片并将其发送到另一个活动以供进一步使用。我将EXTRA_OUTPUT部分包含在putExtra相机意图方法中，这样我就可以获得全尺寸图像而不是缩略图。问题是，在捕获图像后，我被重定向到 MainActivity 。当我在文件管理器中看到时，我发现图像已保存。请帮忙。

 CameraButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
                String imageFileName = timeStamp + ".jpg";
                File storageDir = Environment.getExternalStoragePublicDirectory(
                        Environment.DIRECTORY_PICTURES);
                pictureImagePath = storageDir.getAbsolutePath() + "/" + imageFileName;
                file = new File(pictureImagePath);
                outputFileUri = Uri.fromFile(file);
                Intent camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                camera.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
                startActivityForResult(camera, REQUEST_IMAGE_CAPTURE);
            }
        });


@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK && null != data) {
try {

                    b = MediaStore.Images.Media.getBitmap(this.getContentResolver(), outputFileUri);
                    String filename123 = "myphoto.jpg";
                    FileOutputStream out = this.openFileOutput(filename123, Context.MODE_PRIVATE);
                    b.compress(Bitmap.CompressFormat.JPEG, 100, out);
                    out.close();
                    b.recycle();
                    Intent in1 = new Intent(this, ongallery.class);
                    in1.putExtra("picture", filename123);
                    startActivity(in1);
                }catch(Exception e)
                {
                    Toast.makeText(this,"You got Error!",Toast.LENGTH_SHORT).show();
                }
            }
        } catch (Exception e) {
            Toast.makeText(this,"Something went wrong",Toast.LENGTH_SHORT).show();
        }
    }


//OnaGallery.java
public class ongallery extends Activity {
    public  ImageView imgView;
    int xDim;
    int yDim;
String filename;
    public  Bitmap finale = null ;
    public  Bitmap bmp = null;
    public Bitmap photoEdit;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ongallery);
        imgView = (ImageView) findViewById(R.id.imgView);
        xDim = imgView.getWidth();
        filename = getIntent().getStringExtra("picture");
        try {
            FileInputStream is = this.openFileInput(filename);
            bmp = BitmapFactory.decodeStream(is);
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        Bitmap finalPhoto = decoder(filename,400,400);
            imgView.setImageBitmap(finalPhoto);
            }
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
    }
  public Bitmap decoder(String filename, int reqWidth, int reqHeight) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
      String filepath = getFileStreamPath(filename).getPath();
        BitmapFactory.decodeFile(filepath, options);
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        options.inJustDecodeBounds = false;
        finale = BitmapFactory.decodeFile(filepath, options);
        return finale;
    }
     int calculateInSampleSize( BitmapFactory.Options options, int reqWidth, int reqHeight) {
        int inSampleSize = 1;
        if (options.outHeight > reqHeight || options.outWidth > reqWidth) {
            final int halfHeight = options.outHeight / 2;
            final int halfWidth = options.outWidth / 2;
            while ((halfHeight / inSampleSize) > reqHeight
                    && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }
        return inSampleSize;
    }
}

Answer 1

权限相机权限检查类

public class Utility {
public static final int MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE = 123;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public static boolean checkPermission(final Context context)
{
    int currentAPIVersion = Build.VERSION.SDK_INT;
    if(currentAPIVersion>=android.os.Build.VERSION_CODES.N)
    {
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, Manifest.permission.READ_EXTERNAL_STORAGE)) {
                AlertDialog.Builder alertBuilder = new AlertDialog.Builder(context);
                alertBuilder.setCancelable(true);
                alertBuilder.setTitle("Permission necessary");
                alertBuilder.setMessage("External storage permission is necessary");
                alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
                    }
                });
                AlertDialog alert = alertBuilder.create();
                alert.show();
            } else {
                ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
            }
            return false;
        } else {
            return true;
        }
    } else {
        return true;
    }
}

}

现在在发射相机意图之前检查权限

 boolean permissionCheck = Utility.checkPermission(getActivity());
  if (permissionCheck) {
      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
      startActivityForResult(intent, CAMERA_REQUEST);
    }

现在onActivityResult（）看起来像

  @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
         if (requestCode == CAMERA_REQUEST)
            bitmap = (Bitmap) data.getExtras().get("data");
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

    File destination = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg");

    FileOutputStream fo;
    try {
        destination.createNewFile();
        fo = new FileOutputStream(destination);
        fo.write(bytes.toByteArray());
        fo.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    bitmap = Bitmap.createScaledBitmap(bitmap, 200, 200, false);
    // Toast.makeText(SignUpActivity.this, String.valueOf(destination), Toast.LENGTH_LONG).show();
    imageView.setImageBitmap(bitmap);
    } else if (resultCode == RESULT_CANCELED) {
        Toast.makeText(getActivity(), "Cancelled",
                Toast.LENGTH_SHORT).show();
    }

}

AndroidMenifest.xml

中的权限

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

希望这会对你有所帮助。

Answer 2

如果您在 android＆gt; = 6 上运行代码，则需要在运行之前和安装后通过设备为您的应用授予权限？您是否已完成该操作？这可以通过应用信息/设置菜单完成。

转到

设置 - ＆gt;应用 - ＆gt;（选择您的应用） - ＆gt;权限 - ＆gt; （启用所有权限）

Android中的Camera Intent问题

2 个答案: