package com.android.Dragable;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Region;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
public class Dragable extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View implements
OnTouchListener {
private Paint mPaint;
private Path mPath;
private Bitmap twitter;
private int x ;
private int y ;
public SampleView(Context context) {
super(context);
setFocusable(true);
setBackgroundColor(Color.TRANSPARENT);
this.setOnTouchListener(this);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setAntiAlias(true);
mPaint.setStrokeWidth(6);
mPaint.setTextSize(16);
mPaint.setTextAlign(Paint.Align.RIGHT);
mPath = new Path();
twitter =
BitmapFactory.decodeResource(context.getResources(),
R.drawable.twiter);
}
private void drawScene(Canvas canvas) {
canvas.clipRect(0, 0, 320, 430);
canvas.drawColor(Color.WHITE);
canvas.drawBitmap(twitter, 0, 0, mPaint);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
mPath.reset();
canvas.clipPath(mPath); // makes the clip empty
mPath.addCircle(x, y, 50, Path.Direction.CCW);
canvas.clipPath(mPath, Region.Op.REPLACE);
drawScene(canvas);
canvas.restore();
}
@Override
public boolean onTouch(View view, MotionEvent event) {
x = (int) event.getX();
y = (int) event.getY();
invalidate();
return true;
}
}
}
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