Android center view in FrameLayout doesn't work

Question

I have a FrameLayout in which I have 2 controls: - a custom view which draws a image and some text on it - a textview with a text

I want to center both in the FrameLayout but I can't manage to do it. The Texview is centered just fine, my cusom view remains on the left side, when I make it visible.

<FrameLayout android:id="@+id/CompassMap"                android:layout_width="fill_parent"                 android:layout_height="wrap_content"                android:layout_weight="1"                android:gravity="center">               <view class="com.MyView"         android:id="@+id/myView"         android:layout_width="wrap_content"          android:layout_height="wrap_content"         android:layout_gravity="center_vertical|center_horizontal"         android:visibility="gone"/>                  <TextView android:layout_width="wrap_content"          android:layout_height="wrap_content"         android:layout_gravity="center_vertical|center_horizontal"         android:text="CENTERED" />  </FrameLayout> 

To Mathias, I don't do anything in the constructor, it's just simple

   public class MyMapView extends View {  private int xPos = 0;  private int yPos = 0; private Bitmap trackMap;  private Matrix backgroundMatrix; private Paint backgroundPaint;  private Bitmap position; private Matrix positionMatrix; private Paint positionPaint;  public MyMapView(Context context) {     super(context);     init(context, null); }  public MyMapView(Context context, AttributeSet attrs) {     super(context, attrs);     init(context, attrs); }  public MyMapView(Context context, AttributeSet attrs, int defStyle) {     super(context, attrs, defStyle);     init(context, attrs); }  private void init(final Context context, AttributeSet attrs) {  backgroundMatrix = new Matrix(); backgroundPaint = new Paint(); backgroundPaint.setFilterBitmap(true);  position = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.position); positionMatrix = new Matrix();  positionPaint = new Paint(); positionPaint.setFilterBitmap(true); }  @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {   setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec)); }  @Override protected void onDraw(Canvas canvas) {      int width = getMeasuredWidth();     int height = getMeasuredHeight();      if (trackMap!=null)     {         Bitmap resizedBitmap = Bitmap.createScaledBitmap(trackMap, height, height, true);         canvas.drawBitmap(resizedBitmap, backgroundMatrix, backgroundPaint);      }          canvas.save(Canvas.MATRIX_SAVE_FLAG);         canvas.translate(xPos-position.getWidth()/2, yPos-position.getHeight()/2);         canvas.drawBitmap(position, positionMatrix, positionPaint);          canvas.restore(); }      public void updatePosition(int xpos, int ypos, Bitmap trackImage)     {         xPos=xpos;         yPos=ypos;         trackMap = trackImage;         invalidate();     } } 

Answer 1

We can align a view in center of the FrameLayout by setting the layout_gravity of the child view.

In XML:

android:layout_gravity="center" 

In Java code:

FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); params.gravity = Gravity.CENTER; 

Note: use FrameLayout.LayoutParams not the others existing LayoutParams