Aufrufen einer Kamera aus einer Aktivität, Erfassen eines Bildes und Hochladen auf einen Server

Question

In meiner App habe ich eine Schaltfläche1, die die Kamera aufruft, und nachdem das Bild erfasst wurde, muss es in der Gerätegalerie gespeichert werden. Wenn ich auf button2 klicke, muss die Galerie geöffnet und nach einem Bild gefragt werden. Wenn ausgewählt, muss es in der Bildansicht unterhalb dieser Schaltflächen angezeigt werden.

Hier ist mein Code:

package com.android.imageuploading; 

import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.List; 

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.content.pm.ResolveInfo; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 

public class ImageUploadingActivity extends Activity { 
    private static final int REQUEST_CODE = 1; 
    private Bitmap bitmap; 
    private ImageView imageView; 
    private Button button_1; 
    public int TAKE_PICTURE = 1; 
    private Button button_2; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     imageView = (ImageView) findViewById(R.id.image); 
     button_1 = (Button) findViewById(R.id.button1); 
     button_1.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View v) { 

       Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); 
       startActivityForResult(intent, TAKE_PICTURE); 

      } 
     }); 
     button_2 = (Button) findViewById(R.id.button2); 
     button_2.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View v) { 

       pickImage(getCurrentFocus()); 
      } 
     }); 
    } 

    public void pickImage(View view) { 
     Intent intent = new Intent(); 
     intent.setType("image/*"); 
     intent.setAction(Intent.ACTION_GET_CONTENT); 
     intent.addCategory(Intent.CATEGORY_OPENABLE); 
     startActivityForResult(intent, REQUEST_CODE); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK) 
      try { 
       // We need to recyle unused bitmaps 
       if (bitmap != null) { 
        bitmap.recycle(); 
       } 
       InputStream stream = getContentResolver().openInputStream(
         data.getData()); 
       bitmap = BitmapFactory.decodeStream(stream); 
       stream.close(); 
       imageView.setImageBitmap(bitmap); 
      } catch (FileNotFoundException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     super.onActivityResult(requestCode, resultCode, data); 
    } 

    public static boolean isIntentAvailable(Context context, String action) { 
     final PackageManager packageManager = context.getPackageManager(); 
     final Intent intent = new Intent(action); 
     List<ResolveInfo> list = packageManager.queryIntentActivities(intent, 
       PackageManager.MATCH_DEFAULT_ONLY); 
     return list.size() > 0; 
    } 
} 

Das Problem ist, wenn ich das Bild aufzunehmen, es fragt nach speichern oder verwerfen. Als ich speichern, meine App abstürzt klicken Sie auf und sagte:

java.lang.RuntimeException: Ausfall liefern Ergebnis result {die null =, Anfrage = 1, Ergebnis = -1, data = Intent {act = Inline- Daten (hat Extras)}} auf Aktivität {com.android.imageuploading/com.android.imageuploading.ImageUploadingActivity}: java.lang.NullPointerException

Wo muss ich den Code ändern?

Answer 1

In meinem Fall benutze ich das: wenn ich auf die Schaltfläche "Speichern" klicke, ist pic gespeichert und gebe den Pfad in der filePath-Variable zurück.

String filePath = 
     Environment.getExternalStorageDirectory() +"/your_image_name.jpeg"; 
File file = new File(filePath); 
Uri output = Uri.fromFile(file); 
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, output); 

und in onactiviresul() verwende ich diese "filePath".

Answer 2

Bild aufnehmen:

public class Camera extends Activity 
    { 
private static final int CAMERA_REQUEST = 1888; 
private String selectedImagePath; 
WebView webview; 
String fileName = "capturedImage.jpg"; 
private static Uri mCapturedImageURI; 

@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    Intent cameraIntent = new Intent(ACTION_IMAGE_CAPTURE); 
    startActivityForResult(cameraIntent, CAMERA_REQUEST); 
} 

@Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) 
{ 
    if (resultCode == RESULT_OK) { 
     if (requestCode == CAMERA_REQUEST) 
     { 
      Bitmap photo = (Bitmap) data.getExtras().get("data"); 
      ByteArrayOutputStream bytes = new ByteArrayOutputStream(); 
      photo.compress(Bitmap.CompressFormat.JPEG, 40, bytes); 
      Random randomGenerator = new Random();randomGenerator.nextInt(); 
      String newimagename=randomGenerator.toString()+".jpg"; 
      File f = new File(Environment.getExternalStorageDirectory() 
            + File.separator + newimagename); 
      try { 
       f.createNewFile(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      //write the bytes in file 

      try { 
       fo = new FileOutputStream(f.getAbsoluteFile()); 
      } catch (FileNotFoundException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      try { 
       fo.write(bytes.toByteArray()); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
       uri=f.getAbsolutePath(); 
    //this is the url that where you are saved the image 
     } 



    } 

Bild wählen:

public class ChoosePicture extends Activity 
    { 
     private static final int SELECT_PICTURE = 1; 
     private String selectedImagePath; 

     @Override 
     public void onCreate(Bundle savedInstanceState) 
     { 
      super.onCreate(savedInstanceState); 
      webview=(WebView)findViewById(R.id.webView1); 
      Intent intent = new Intent(); 
      intent.setType("image/*"); 
      intent.setAction(Intent.ACTION_GET_CONTENT); 
      intent.addCategory(Intent.CATEGORY_OPENABLE); 
      startActivityForResult(intent, SELECT_PICTURE); 
     } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) 
    { 
     if (resultCode == RESULT_OK) { 
      if (requestCode == SELECT_PICTURE) 
      { 
       Uri selectedImageUri = data.getData(); 
       selectedImagePath = getPath(selectedImageUri); 
       try { 
        FileInputStream fileis=new FileInputStream(selectedImagePath); 
        BufferedInputStream bufferedstream=new BufferedInputStream(fileis); 
        byte[] bMapArray= new byte[bufferedstream.available()]; 
        bufferedstream.read(bMapArray); 
        Bitmap bMap = BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length); 
    //this is the image that you are choosen 

        if (fileis != null) 
        { 
         fileis.close(); 
        } 
        if (bufferedstream != null) 
        { 
         bufferedstream.close(); 
        } 
       } catch (FileNotFoundException e) {     
        e.printStackTrace(); 
       } catch (IOException e) {     
        e.printStackTrace(); 
       }    
      } 
     } 
    } 


public String getPath(Uri uri) { 
     String[] projection = { MediaStore.Images.Media.DATA }; 
     Cursor cursor = managedQuery(uri, projection, null, null, null); 
     int column_index = cursor 
       .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
     cursor.moveToFirst(); 
     return cursor.getString(column_index); 
    } 
}