Custom View show on center of the screen
android
Solution
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
this.setMeasuredDimension(backgound.getWidth(), backgound.getHeight());
}
implement the onMeasure(int,int)
Problem
i write a custom view class. i've implement the custom view on Main Layout xml. and set parameter for center of the screen using below code ``` <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/cs_background" android:id="@+id/layout" > <com.drawings.DrawingView android:id="@+id/drawingview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" /> </RelativeLayout> ``` In graphics layout , it show correctly on center postion. But when i execute on simulator, it shows on left top corner. i've tried to change to implement the layout programmatically, using below code. ``` RelativeLayout layout = new RelativeLayout(this); DrawingView myView = new DrawingView(this); RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); params.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE); layout.addView(myView,params); setContentView(linearLayout); ``` But still its show on left top corener. My drawingview class is, ``` import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Path; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; public class DrawingView extends View { Context context; private Path mPath; private Bitmap backgound; private Paint mPaint; private float mX,mY; private static final float TOUCH_TOLERANCE =4; public DrawingView(Context c) { super(c); context = c; init(); } public DrawingView (Context c, AttributeSet as) { super(c,as); context = c; init(); } private void init() { mPath = new Path(); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(0xFFFF0000); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(12); backgound = BitmapFactory.decodeResource(context.getResources(), R.drawable.cs_one); } @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(backgound, 0, 0, null); if(!mPath.isEmpty()) canvas.drawPath(mPath, mPaint); invalidate(); } private void touch_start(float x, float y) { mPath.moveTo(x, y); } private void touch_move(float x, float y) { float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); } } @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: touch_start(x, y); break; case MotionEvent.ACTION_MOVE: touch_move(x, y); break; case MotionEvent.ACTION_UP: // touch_up(); break; } invalidate(); return true; } } ``` what is the problem? and how to show the custom view on center of the screen. ?