imageview.getDrawableをandroidに設定するには

Question

画像をぼかしていますが、ヌルポイントを取得しようとしています。アプリを実行する際に例外エラーが発生しました。srcの代わりにbackgroungを設定して、それSRCにしかし、その後も、ここで同じエラーを取得しては、私のコードです

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
app:layout_behavior="@string/appbar_scrolling_view_behavior" 
tools:context="com.union.test44.MainActivity" 
tools:showIn="@layout/activity_main"> 

<ImageView 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:id="@+id/imageView" 
android:layout_centerVertical="true" 
android:layout_centerHorizontal="true" 
android:src="@drawable/thumb5"/> 

私のJavaコードがある

Context context; 
ImageView imageview; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
imageview = (ImageView)findViewById(R.id.imageView); 

BitmapDrawable drawable = (BitmapDrawable) imageview.getDrawable(); 
Bitmap bitmap = drawable.getBitmap(); 
Bitmap blurred = blurRenderScript(bitmap, 24);//second parametre is radius 
imageview.setImageBitmap(blurred); 

} 

@SuppressLint("NewApi") 
private Bitmap blurRenderScript(Bitmap smallBitmap, int radius) { 

try { 
    smallBitmap = RGB565toARGB888(smallBitmap); 
} catch (Exception e) { 
    e.printStackTrace(); 
} 


Bitmap bitmap = Bitmap.createBitmap(
     smallBitmap.getWidth(), smallBitmap.getHeight(), 
     Bitmap.Config.ARGB_8888); 

RenderScript renderScript = RenderScript.create(context); 

Allocation blurInput = Allocation.createFromBitmap(renderScript, smallBitmap); 
Allocation blurOutput = Allocation.createFromBitmap(renderScript, bitmap); 

ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(renderScript, 
     Element.U8_4(renderScript)); 
blur.setInput(blurInput); 
blur.setRadius(radius); // radius must be 0 < r <= 25 
blur.forEach(blurOutput); 

blurOutput.copyTo(bitmap); 
renderScript.destroy(); 

return bitmap; 

} 

private Bitmap RGB565toARGB888(Bitmap img) throws Exception { 
int numPixels = img.getWidth() * img.getHeight(); 
int[] pixels = new int[numPixels]; 

//Get JPEG pixels. Each int is the color values for one pixel. 
img.getPixels(pixels, 0, img.getWidth(), 0, 0, img.getWidth(), img.getHeight()); 

//Create a Bitmap of the appropriate format. 
Bitmap result = Bitmap.createBitmap(img.getWidth(), img.getHeight(), Bitmap.Config.ARGB_8888); 

//Set RGB pixels. 
result.setPixels(pixels, 0, result.getWidth(), 0, 0, result.getWidth(), result.getHeight()); 
return result; 
} 

Answer 1

はなかったが、あなたはそのようにしようとした：どのようなラインで

Bitmap attachedbitmap= ((BitmapDrawable)imageview.getDrawable()).getBitmap();

Answer 2

方が良い、直接使用したい：

// Your ImageView 
ImageView originalImageView = (ImageView) findViewById(R.id.imageView); 

// Input image (the drawable) 
Bitmap inputImage = BitmapFactory.decodeResource(getResources(), R.drawable.thumb5); 
int inputWidth = inputImage.getWidth(); 
int inputHeight = inputImage.getHeight(); 

Allocation inputAllocation = Allocation.createFromBitmap(mRS, inputImage);  

// Generate the output allocation 
Type.Builder tbOutput = new Type.Builder(mRS, Element.RGBA_8888(mRS)); 
tbOutput.setX(inputWidth); 
tbOutput.setY(inputHeight); 
Allocation outputAllocation = Allocation.createTyped(mRS, tbOutput.create()); 

// Go on with the processing :) 
... 

// Then, set the bitmap 
Bitmap outputBitmap = Bitmap.createBitmap(inputWidth, inputHeight, Bitmap.Config.ARGB_8888); 

outputAllocation.copyTo(outputBitmap); 

// Copy bitmap to ImageView  
originalImageView.setImageBitmap(outputBitmap); 

参考：RenderScript: parallel computing on Android, the easy way