如何在android

Question

中獲取自定義視圖的屏幕中心我想將此代碼添加到我的項目Google Maps with Custom View Overlays中，但無法通過getScreenCenter（）函數獲取。

活性，其中包括自定義視圖：

public class TempActivity extends AppCompatActivity { 


     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.tempView); 

//suppose that I have a map fragment initialise 

getSearchRadius(); //this is the function where I am stuck; 
     } 

/** 
* @return distance in meters from center of circle to a point on the circle 
*/ 
public double getSearchRadius() { 
    //Google Map LatLng objects must be converted to android Location objects 
    //in order to use distanceTo() 

    Point circlePoint = getScreenCenter(); 
    circlePoint.x = circlePoint.x - getCircleRadius(); 

    Point centerPoint = getScreenCenter();//how to get screenCenter 

    LatLng centerLatLng = map.getProjection().fromScreenLocation(centerPoint); 
    Location center = new Location(""); 
    center.setLatitude(centerLatLng.latitude); 
    center.setLongitude(centerLatLng.longitude); 


    LatLng circleLatLng = map.getProjection().fromScreenLocation(circlePoint); 
    Location circlePointLocation = new Location(""); 
    circlePointLocation.setLatitude(circleLatLng.latitude); 
    circlePointLocation.setLongitude(circleLatLng.longitude); 

    return center.distanceTo(circlePointLocation); 

} 

    } 

定製視圖：

public class DottedCircleView extends LinearLayout (due to exception I changed View to LinearLayout) { 
    int color = 0, radius = 0, width = 0, height = 0; 
    Paint p; 
    BitmapDrawable pin; 
    int pinXOffset =0 ,pinYOffset =0; 
    Context con; 

    public DottedCircleView(Context context) 
    { 
     super(context); 
     con = context; 

    } 

    public DottedCircleView(Context context, AttributeSet attrs, int defStyle) { 
     super(context, attrs, defStyle); 
     TypedArray a = context.obtainStyledAttributes(attrs, 
       R.styleable.DottedCircleView, 0, 0); 
     int color = a.getColor(R.styleable.DottedCircleView_circleColor, context.getResources().getColor(R.color.blue_btn_bg_color)); 
     int radius = a.getInteger(R.styleable.DottedCircleView_radius, 0); 
     a.recycle(); 

     setup(); 
    } 

    public DottedCircleView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 




    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     width = View.MeasureSpec.getSize(widthMeasureSpec); 
     height = MeasureSpec.getSize(heightMeasureSpec); 

     if (radius == 0) { 
      radius = Math.min(width, height)/2 - (int) p.getStrokeWidth(); 
     } 

     super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
    } 

    @Override 
    public void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 

     canvas.drawCircle(width/2, height/2, radius, p); 
     //draw the map marker in middle of the circle 
     canvas.drawBitmap(pin.getBitmap(), (width/2) - pinXOffset, (height/2) - pinYOffset, null); 
     invalidate(); 
    } 

    public void setup() { 
     p = new Paint(); 
     p.setColor(getResources().getColor(color)); 
     p.setStrokeWidth(10); 
     DashPathEffect dashPath = new DashPathEffect(new float[]{10.0f, 5.0f}, (float) 1.0); 
     p.setPathEffect(dashPath); 
     p.setStyle(Paint.Style.STROKE); 
     pin = (BitmapDrawable) getResources().getDrawable(R.drawable.boy_marker); 
     pinXOffset = pin.getIntrinsicWidth()/2; 
     pinYOffset = pin.getIntrinsicHeight(); 
    } 
} 

Customview XML：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:toast="http://schemas.android.com/apk/res-auto" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

<com.support.android.designlibdemo.utils.DottedCircleView 
     android:id="@+id/dottedCircleView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     toast:circleColor="@color/orange50" 
     toast:radius="10"/> 
</LinearLayout> 

Answer 1

你可以嘗試以下方法：

Display display = getWindowManager().getDefaultDisplay(); 
Point size = new Point(); 
display.getSize(size); 
int widthCenter = size.x/2; 
int heightCenter = size.y/2;