onActivityResult（）未在相机应用程序中调用

Question

我从android开发人员页面复制了有关Taking Photos Simply的代码。 我在这里读了很多关于onActivityResult的帖子没有被触发。这些场景都不适合我。如果有人能帮助我，我会很高兴。提前致谢。 这是我的代码。

public class MainActivity extends AppCompatActivity { 
ImageView mImageView; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    mImageView = (ImageView)findViewById(R.id.imageView); 
    Button button = (Button)findViewById(R.id.button); 
    button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      dispatchTakePictureIntent(); 
     } 
    }); 


} @Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) { 
     Bundle extras = data.getExtras(); 
     Bitmap imageBitmap = (Bitmap) extras.get("data"); 
     galleryAddPic(); 
     setPic(); 
     mImageView = (ImageView)findViewById(R.id.imageView); 
     mImageView.setImageBitmap(imageBitmap); 
    } 
} 
String mCurrentPhotoPath;private File createImageFile() throws IOException { 
    // Create an image file name 
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); 
    String imageFileName = "JPEG_" + timeStamp + "_"; 
    File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES); 
    File image = File.createTempFile(
      imageFileName, /* prefix */ 
      ".jpg",   /* suffix */ 
      storageDir  /* directory */ 
    ); 

    // Save a file: path for use with ACTION_VIEW intents 
    mCurrentPhotoPath = image.getAbsolutePath(); 
    return image; 
} 
static final int REQUEST_TAKE_PHOTO = 1; 

private void dispatchTakePictureIntent() { 
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
    // Ensure that there's a camera activity to handle the intent 
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) { 
     // Create the File where the photo should go 
     File photoFile = null; 
     try { 
      photoFile = createImageFile(); 
     } catch (IOException ex) { 
      // Error occurred while creating the File 

     } 
     // Continue only if the File was successfully created 
     if (photoFile != null) { 
      Uri photoURI = Uri.fromFile(photoFile); 
      takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI); 
      startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO); 
     } 
    } 
} 
private void galleryAddPic() { 
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); 
    File f = new File(mCurrentPhotoPath); 
    Uri contentUri = Uri.fromFile(f); 
    mediaScanIntent.setData(contentUri); 
    this.sendBroadcast(mediaScanIntent); 
} 

private void setPic() { 
    // Get the dimensions of the View 
    int targetW = mImageView.getWidth(); 
    int targetH = mImageView.getHeight(); 

    // Get the dimensions of the bitmap 
    BitmapFactory.Options bmOptions = new BitmapFactory.Options(); 
    bmOptions.inJustDecodeBounds = true; 
    BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); 
    int photoW = bmOptions.outWidth; 
    int photoH = bmOptions.outHeight; 

    // Determine how much to scale down the image 
    int scaleFactor = Math.min(photoW/targetW, photoH/targetH); 

    // Decode the image file into a Bitmap sized to fill the View 
    bmOptions.inJustDecodeBounds = false; 
    bmOptions.inSampleSize = scaleFactor; 
    bmOptions.inPurgeable = true; 

    Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); 
    mImageView.setImageBitmap(bitmap); 
}} 

这里是我的清单

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.tahir.fotodeneme257"> 
<uses-feature android:name="android.hardware.camera" 
    android:required="true" /> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    <activity android:name=".MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application></manifest> 

Answer 1

我找到了解决办法。我不知道这是否是在Android或什么错误，但是当我写这篇文章

takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI); 

onActivityResult（）的意图返回null。所以，实际上不是关于onActivityResult（）没有调用。这是关于在onActivityResult传递的意图返回null。

所以，我刚刚删除putExtra（）方法，它现在工作正常。

Answer 2

检查此链接，一旦你得到一些信息：

http://www.androidhive.info/2014/12/android-uploading-camera-image-video-to-server-with-progress-bar/

https://androidmyway.wordpress.com/2012/02/05/selecting-image-from-gallery-or-taking-image-from-camera-with-options-menu-uploading-to-server/