Kann das aufgenommene Bild nicht von der Kamera abrufen

Question

Ich baue eine einfache Kamera-Anwendung in Android, die eine Kamera Absicht auf einen Klick auf eine Schaltfläche starten würde. Die Kameraabsicht würde dann auf ein Bild klicken, das später in der ImageView in der MainActivity angezeigt würde. Das Problem ist jedoch, dass ich das Bild erfassen kann, aber sobald das Bild erfasst wird, anstatt das Bild anzuzeigen, stürzt die App plötzlich ab.

Hier ist mein Code für die App ist:

MainActivity.java

package com.example.suzancruz.cameraapplicaton; 

import android.content.Intent; 
import android.graphics.Bitmap; 
import android.provider.MediaStore; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.ImageView; 


public class MainActivity extends AppCompatActivity { 


    static final int REQUEST_IMAGE_CAPTURE = 123; 
    ImageView myImageView; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

    } 

    //Launching the camera 
    public void launchCamera(View view){ 
     Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     //Take a picture and pass results along to onActivityResult 
     startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); 
    } 

    //If you want to return the image taken 
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if(requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK){ 
      //Get the photo 
      Bundle extras = data.getExtras(); 
      Bitmap photo = (Bitmap) extras.get("data"); 
      myImageView.setImageBitmap(photo); 
     } 
    } 
} 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.suzancruz.cameraapplicaton.MainActivity"> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:onClick="launchCamera" 
     android:layout_alignParentBottom="true" 
     android:layout_centerHorizontal="true" 
     android:text="Take Picture" 

     /> 
    <ImageView 
     android:layout_width="300dp" 
     android:layout_height="300dp" 
     android:id="@+id/myImageView" 

     /> 
</RelativeLayout> 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.suzancruz.cameraapplicaton"> 

    <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> 
     <uses-feature android:name="android.hardware.camera2"></uses-feature> 
     <uses-permission android:name="android.permission.CAMERA"/> 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
    </application> 

</manifest> 

Answer 1

versuchen, diese `Öffentlichkeit void onTakeImg() {

values = new ContentValues(); 
    values.put(MediaStore.Images.Media.TITLE, "Image"); 
    values.put(MediaStore.Images.Media.DESCRIPTION, "From your Camera"); 
    imageUri = getActivity().getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); 
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); 
    if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) { 
     startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE); 
    } 

} 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 

    switch (requestCode) { 
     case REQUEST_IMAGE_CAPTURE: 
      if (resultCode == RESULT_OK) { 
       try { 
        mBitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), imageUri); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
       onImageAvailable(mBitmap, requestCode); 
       Img.setImageBitmap(mBitmap); 
           } 
      break; 

    } 
} 

void onImageAvailable(Bitmap imageBitmap, int requestCode) { 
    String output = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString() + "/.immigration/temp/"; 
    File f = new File(output); 
    if (!f.exists()) { 
     f.mkdirs(); 
    } 

    String filename = output + "Image.jpg"; 

    File fileDelete = new File(filename); 

    if (fileDelete.exists()) { 
     if (fileDelete.delete()) { 
      System.out.println("file Deleted :" + filename); 
     } else { 
      System.out.println("file not Deleted :" + filename); 
     } 
    } 

    try { 
     FileOutputStream out = new FileOutputStream(filename); 
     Matrix matrix = new Matrix(); 
     if (imageBitmap.getWidth() < imageBitmap.getHeight()) { 
      matrix.postRotate(90); 
     } 
     mBitmap = Bitmap.createBitmap(imageBitmap, 0, 0, imageBitmap.getWidth(), imageBitmap.getHeight(), matrix, true); 
     mBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out); 
     out.close(); 
     Log.d("Ar", "Ole"); 
    } catch (IOException e) { 
     e.printStackTrace(); 
     Log.d("Ar", e.toString()); 
    } 

    File fdelete = new File(imageUri.getPath()); 
    if (fdelete.exists()) { 
     if (fdelete.delete()) { 
      System.out.println("file Deleted :" + imageUri.getPath()); 
     } else { 
      System.out.println("file not Deleted :" + imageUri.getPath()); 
     } 
    } 

}`