无法将图像数据传递回Android应用程序

Question

我一直试图在捕获后将图像数据传回应用程序。但是，尝试返回到我的应用程序时，它总是崩溃。

的代码开始的意图是：

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    imgView = (ImageView) findViewById(R.id.ImageView); 
    upload = (Button) findViewById(R.id.Upload); 
    snap = (Button) findViewById(R.id.Snap); 
    select = (Button) findViewById(R.id.Select); 
    subject = (EditText) findViewById(R.id.Subject); 
    msg = (EditText) findViewById(R.id.Message);snap.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      // TODO Auto-generated method stub 
      String imageFilePath = Environment.getExternalStorageDirectory(). 
      getAbsolutePath() + "/picture.jpg"; 
      File imageFile = new File(imageFilePath); 
      Uri imageFileUri = Uri.fromFile(imageFile); // convert path to Uri 

      Intent it = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
      it.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageFileUri); 
      startActivityForResult(it, CAMERA_RESULT); 
      } 
     }); 
} 

接收意向的代码是：

case CAMERA_RESULT: 
     if (resultCode == Activity.RESULT_OK) { 

        // Get Extra from the intent 
        Bundle extras = data.getExtras(); 
        // Get the returned image from extra 
        Bitmap bmp = (Bitmap) extras.get("data"); 

        imgView = (ImageView) findViewById(R.id.ImageView); 
        imgView.setImageBitmap(bmp); 
       } 
     break; 

我也收到以下例外情况发生应用程序崩溃时：

java.lang.RuntimeException：无法恢复活动{com.NYP.estatemanagement/com.NYP.estatemanagement.MainActivity}： java.lang.RuntimeException：将结果ResultInfo {who = null，request = 100，result = -1，data = null}传递给activity {com.NYP.estatemanagement/com.NYP.estatemanagement.MainActivity}：java.lang。 NullPointerException异常

Answer 1

试试这个从@Biraj Zalavadia（回答）工作般的魅力与我

private String selectedImagePath = ""; 
    final private int PICK_IMAGE = 1; 
    final private int CAPTURE_IMAGE = 2; 

public Uri setImageUri() { 
     // Store image in dcim 
     File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png"); 
     Uri imgUri = Uri.fromFile(file); 
     this.imgPath = file.getAbsolutePath(); 
     return imgUri; 
    } 


    public String getImagePath() { 
     return imgPath; 
    } 

btnGallery.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(); 
       intent.setType("image/*"); 
       intent.setAction(Intent.ACTION_GET_CONTENT); 
       startActivityForResult(Intent.createChooser(intent, ""), PICK_IMAGE); 

      } 
     }); 

     btnCapture.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri()); 
       startActivityForResult(intent, CAPTURE_IMAGE); 
      } 
     }); 

@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (resultCode != Activity.RESULT_CANCELED) { 
      if (requestCode == PICK_IMAGE) { 
       selectedImagePath = getAbsolutePath(data.getData()); 
       imgUser.setImageBitmap(decodeFile(selectedImagePath)); 
      } else if (requestCode == CAPTURE_IMAGE) { 
       selectedImagePath = getImagePath(); 
       imgUser.setImageBitmap(decodeFile(selectedImagePath)); 
      } else { 
       super.onActivityResult(requestCode, resultCode, data); 
      } 
     } 

    } 


public Bitmap decodeFile(String path) { 
     try { 
      // Decode image size 
      BitmapFactory.Options o = new BitmapFactory.Options(); 
      o.inJustDecodeBounds = true; 
      BitmapFactory.decodeFile(path, o); 
      // The new size we want to scale to 
      final int REQUIRED_SIZE = 70; 

      // Find the correct scale value. It should be the power of 2. 
      int scale = 1; 
      while (o.outWidth/scale/2 >= REQUIRED_SIZE && o.outHeight/scale/2 >= REQUIRED_SIZE) 
       scale *= 2; 

      // Decode with inSampleSize 
      BitmapFactory.Options o2 = new BitmapFactory.Options(); 
      o2.inSampleSize = scale; 
      return BitmapFactory.decodeFile(path, o2); 
     } catch (Throwable e) { 
      e.printStackTrace(); 
     } 
     return null; 

    } 

public String getAbsolutePath(Uri uri) { 
     String[] projection = { MediaColumns.DATA }; 
     @SuppressWarnings("deprecation") 
     Cursor cursor = managedQuery(uri, projection, null, null, null); 
     if (cursor != null) { 
      int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA); 
      cursor.moveToFirst(); 
      return cursor.getString(column_index); 
     } else 
      return null; 
    } 

Answer 2

这个（下）：

public String getAbsolutePath(Uri uri) { 
     String[] projection = { MediaColumns.DATA }; 
     @SuppressWarnings("deprecation") 
     Cursor cursor = managedQuery(uri, projection, null, null, null); 
     if (cursor != null) { 
      int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA); 
      cursor.moveToFirst(); 
      return cursor.getString(column_index); 
     } else 
      return null; 
    } 

和

String selectedImagePath = getAbsolutePath(data.getData()); 

是我所需要的