So platzieren Sie ein Bild auf einem Anpassen ListView

Question

Ich bin neu ein Android, ich möchte eine Documents Scanner-Anwendung machen. Daher nutze ich für die Crop-Funktion die GitHub-Bibliothek, um das Bild in einer Listenansicht anzuzeigen. Dazu nutze ich die Universal Image Loader Library auch aus dem Github aber immer noch etwas Fehler. Diese Bibliothek habe ich ihn auf einem libs Ordner

Bitte geben Sie mir einige einfache Lösung

Hier ist meine Haupttätigkeit ist

public class MainActivity extends AppCompatActivity { 
Button btn; 
Context context = this; 
public static final int REQUEST_Code = 99; 
ImageView mImageView; 
int prefrences = ScanConstants.OPEN_CAMERA; 
ListView mListView; 
ArrayAdapter<String > images_adapter; 
ImageLoader imageLoader; 
ArrayList images_Uri; 
DisplayImageOptions options; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    mListView= (ListView) findViewById(R.id.mListView); 
    btn = (Button) findViewById(R.id.button); 
    btn.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      showdialogebox(); 

     } 
    }); 


} 

private void showdialogebox() { 
    AlertDialog.Builder builder = new AlertDialog.Builder(context); 
    builder.setTitle("Take Phote"); 
    final String item[] = {"Take form cam", "Take form file"}; 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_item, item); 
    AlertDialog.Builder builder1 = builder.setAdapter(adapter, new DialogInterface.OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int which) { 

      if (which == 0) { 
       Intent intent = new Intent(getApplicationContext(), ScanActivity.class); 
       intent.putExtra(ScanConstants.OPEN_INTENT_PREFERENCE, prefrences); 
       startActivityForResult(intent, REQUEST_Code); 

      } 

     } 
    }); 
    builder.show(); 
} 


@Override 

protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    Uri uri = data.getExtras().getParcelable(ScanConstants.SCANNED_RESULT); 

    getContentResolver().delete(uri, null, null); 

    images_Uri.add(uri); 
    Image_Adapter adapter=new Image_Adapter(getApplicationContext(),R.layout.single_image_view,images_Uri); 
    mListView.setAdapter(adapter); 
} 
} 

Hier ist meine Image_Adapter Klasse Code

public class Image_Adapter extends ArrayAdapter<ViewHolderImage> { 
Context context; 
int resourceid; 
public final static String IMAGE_PATH = Environment 
     .getExternalStorageDirectory().getPath() + "/scanSample"; 
ArrayList images=null; 
public Image_Adapter(Context context, int resource, ArrayList images) { 
    super(context,resource,images); 
    this.context=context; 
    this.resourceid=resource; 
    this.images=images; 
} 
ViewHolderImage holderImage=null; 

@NonNull 
@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    if (convertView==null){ 
     LayoutInflater inflater=((Activity)context).getLayoutInflater(); 
     convertView=inflater.inflate(resourceid,parent,false); 
     holderImage=new ViewHolderImage(); 
     holderImage.imageView=(ImageView)convertView.findViewById(R.id.mImageView); 
     convertView.setTag(holderImage); 
    }else 
{ 
     holderImage=(ViewHolderImage)convertView.getTag(); 
    } 
    holderImage.imageView.setMaxWidth(100); 
    holderImage.imageView.setMaxWidth(100); 
    ImageLoader imageLoader =null; 
    imageLoader.displayImage(IMAGE_PATH,holderImage.imageView); 
    return convertView; 
} 
} 

ViewHolderImage-Klassencode ist

enter code here 
    public class ViewHolderImage { 
     ImageView imageView; 
    } 

Dies ist der Fehler zeigen auf der Log-Katze `

>>>> Normal User 
      11-24 22:22:11.180 25628-25628/com.example.hassanjan.documentsscannerapp1 E/dalvikvm:  >>>>> com.example.hassanjan.documentsscannerapp1 [ userId:0 | appId:10236 ] 
      11-24 22:22:11.490 25628-25628/com.example.hassanjan.documentsscannerapp1 E/InstantRun: Could not find slices in APK; aborting. 
      11-24 22:22:11.720 25628-25628/com.example.hassanjan.documentsscannerapp1 E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering 
      11-24 22:22:16.906 25628-25628/com.example.hassanjan.documentsscannerapp1 E/ViewRootImpl: sendUserActionEvent() mView == null 
      11-24 22:22:33.664 25628-25628/com.example.hassanjan.documentsscannerapp1 E/ViewRootImpl: sendUserActionEvent() mView == null 
      11-24 22:22:42.223 25628-25628/com.example.hassanjan.documentsscannerapp1 E/AndroidRuntime: FATAL EXCEPTION: main 
      Process: com.example.hassanjan.documentsscannerapp1, PID: 25628                        java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=99, result=-1, data=Intent { (has extras) }} to activity {com.example.hassanjan.documentsscannerapp1/com.example.hassanjan.documentsscannerapp1.MainActivity}: java.lang.NullPointerException 
      at android.app.ActivityThread.deliverResults(ActivityThread.java:3580) 
      at android.app.ActivityThread.handleSendResult(ActivityThread.java:3623) 
      at android.app.ActivityThread.access$1400(ActivityThread.java:169) 
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1328) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:146) 
      at android.app.ActivityThread.main(ActivityThread.java:5487) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
     dalvik.system.NativeStart.main(Native Method) 
      Caused by: java.lang.NullPointerException 
     at com.example.hassanjan.documentsscannerapp1.MainActivity.onActivityResult(MainActivity.java:114) 
      at android.app.Activity.dispatchActivityResult(Activity.java:5643) 
      at android.app.ActivityThread.deliverResults(ActivityThread.java:3576) 
      at android.app.ActivityThread.handleSendResult(ActivityThread.java:3623) 
      at android.app.ActivityThread.access$1400(ActivityThread.java:169) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1328) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:146) 
     at android.app.ActivityThread.main(ActivityThread.java:5487) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
    at dalvik.system.NativeStart.main(Native Method) 

** Fehler zeigen auf Hassanjan114 auf Hauptaktivität **

 images_Uri.add(uri); 

Answer 1

können Sie das Bild in Listenansicht einstellen Fügen Sie auf diese Weise in Ihrer Gradel-Datei compile 'com.github.bumptech.glide:glide:3.7.0' hinzu und hier ist ein Codeabschnitt, mit dem ich die Bildansicht zur Listenansicht hinzufügen kann:

ImageView circleImageView = (ImageView) view.findViewById(R.id.profile_image); 

      Mediafileinfo mediafileinfo =(Mediafileinfo)getItem(position); 


    Glide.with(getContext()).load(mediafileinfo.getAlbum_art_uri()) 
      .thumbnail(1f) 
      .crossFade() 
      .override(50,50) //(the size of the image) 
      .placeholder(R.drawable.music) 
      .diskCacheStrategy(DiskCacheStrategy.SOURCE) 
      .into(circleImageView); 

ist hier ein Tutorial link