使用IndoorAtlas將位圖顯示到UI線程中

Question

以下是我想要的內容：在IndoorAtlas中加載平面佈局並顯示當前位置。 這裏是我的代碼：

public void loadFloorPlanImage(FloorPlan floorPlan) { 
    BitmapFactory.Options options = createBitmapOptions(floorPlan); 
    FutureResult<Bitmap> result = mIndoorAtlas.fetchFloorPlanImage(floorPlan,options); 
    result.setCallback(new ResultCallback<Bitmap>() { 
     @Override 
     public void onResult(final Bitmap result) { 
      runOnUiThread(new Runnable() { 
       @Override 
       public void run() { 
        ImageView imageView = (ImageView) findViewById(R.id.imageView); 
        imageView.setImageBitmap(result); 
       } 
     }); 
     } 
    }); 
} 

這：

private BitmapFactory.Options createBitmapOptions(FloorPlan floorPlan) { 
    int reqWidth = 2048; 
    int reqHeight = 2048; 
    final int width = (int) floorPlan.dimensions[0]; 
    final int height = (int) floorPlan.dimensions[1]; 
    int inSampleSize = 1; 

    if (height > reqHeight || width > reqWidth) { 
     final int halfHeight = height/2; 
     final int halfWidth = width/2; 
     while ((halfHeight/inSampleSize) > reqHeight 
       && (halfWidth/inSampleSize) > reqWidth) { 
      inSampleSize *= 2; 
     } 
    } 
    options.inSampleSize = inSampleSize; 
    return options; 
} 

我收到錯誤結果：

java.lang.NullPointerException: Attempt to write to field 'int android.graphics.BitmapFactory$Options.inSampleSize' on a null object reference 
     at skripsi.ubm.studenttracking.indoor.createBitmapOptions(indoor.java:370) 
     at skripsi.ubm.studenttracking.indoor.loadFloorPlanImage(indoor.java:322) 
     at skripsi.ubm.studenttracking.indoor$1.onResult(indoor.java:163) 
     at skripsi.ubm.studenttracking.indoor$1.onResult(indoor.java:159) 

你能幫助我嗎？

Answer 1

需要初始化像這樣：

BitmapFactory.Options options = new BitmapFactory.Options(); 
options = createBitmapOptions(floorPlan);