Android：保存从相机拍摄的裁剪图像时出现问题

Question

我在将从相机中裁剪的图像保存到指定路径的SD卡时遇到了问题。

代码-->

public class PhotocropActivity extends Activity 
{
    /** Called when the activity is first created. */
    private static final int SELECT_PICTURE = 1;
    private static final int PICK_FROM_CAMERA = 2;
    private Uri muri;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final CharSequence[] items = {"Capture New Image", "Upload from gallery"};
        AlertDialog.Builder builder  = new AlertDialog.Builder(PhotocropActivity.this);
        builder.setTitle("Select Image");
        builder.setItems(items, new DialogInterface.OnClickListener()
        {
            public void onClick(DialogInterface dialog, int item)
            {
                Intent intent = new Intent();
                intent.putExtra("crop", "true");
                intent.putExtra("aspectX", 730);
                intent.putExtra("aspectY", 1115);
                intent.putExtra("outputX", 730);
                intent.putExtra("outputY", 1115);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, getTempFile());
                intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
                if(item==0)
               {
                    intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
                    startActivityForResult(intent, PICK_FROM_CAMERA);
               }
               else if(item==1)
               {
                    intent.setAction(Intent.ACTION_PICK);
                    intent.setType("image/*");
                    startActivityForResult(intent, SELECT_PICTURE);
                }
            }
            private Uri getTempFile()
            {
                 muri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"Image_" + String.Valueof(System.currentTimeMillis()) + ".jpg"));
                 return muri;
             } 
        });
        final AlertDialog alert = builder.create();
        ((Button) findViewById(R.id.button)).setOnClickListener(new OnClickListener() 
        {
            @Override
            public void onClick(View view)
            {
                alert.show();   
            }
        });
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) 
    {
        super.onActivityResult(requestCode, resultCode, data);

        switch(requestCode)
        {
            case PICK_FROM_CAMERA : if (resultCode == RESULT_OK)
            { 
                String filePath= muri.getPath();
                Toast.makeText(this, filePath, Toast.LENGTH_SHORT).show();
                Bitmap selectedImage = BitmapFactory.decodeFile(filePath);
                ImageView image = (ImageView)findViewById(R.id.selectedimage);
                image.setImageBitmap(selectedImage);
            }
            break;
            case SELECT_PICTURE : if (resultCode == RESULT_OK) 
            {
                  String filePath= muri.getPath();
                  Toast.makeText(this, filePath, Toast.LENGTH_SHORT).show();
                  Bitmap selectedImage =  BitmapFactory.decodeFile(filePath);
                  ImageView image = (ImageView)findViewById(R.id.selectedimage);
                  image.setImageBitmap(selectedImage);
            }
            break;
            default:
                break;
        }
    }
}

在 PICK_FROM_CAMERA 中，当我调试它时，它显示 String filePath= muri.getPath(); 处出现了 NULLPOINTEREXCEPTION。但是在 getTempFile() 中它显示了 muri 的值。有人能帮我修复代码中的错误吗？我遇到了很大的麻烦。

- Geetanjali

Answer 1

嘿，我已经解决了这个问题，而且它非常完美。以下是代码-->

case PICK_FROM_CAMERA : if (resultCode == RESULT_OK)
            { 
                ContentValues values = new ContentValues();
                values.put(Images.Media.TITLE, "title");
                values.put(Images.Media.BUCKET_ID, "test");
                values.put(Images.Media.DESCRIPTION, "test Image taken");
                values.put(Images.Media.MIME_TYPE, "image/jpeg");
                Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
                Bitmap photo = (Bitmap) data.getExtras().get("data");
                ((ImageView)findViewById(R.id.selectedimage)).setImageBitmap(photo);
                OutputStream outstream;
                try {
                        outstream = getContentResolver().openOutputStream(uri);
                        photo.compress(Bitmap.CompressFormat.JPEG,100, outstream);
                        outstream.close();
                } catch (FileNotFoundException e) {}
                catch (IOException e){}

- Geetanjali