1 跟隨手指移動的球

標籤：

 1 package ui; 2  3 import android.content.Context; 4 import android.graphics.Canvas; 5 import android.graphics.Color; 6 import android.graphics.Paint; 7 import android.util.AttributeSet; 8 import android.view.MotionEvent; 9 import android.view.View;10 11 /**12  * Created by Administrator on 2016/4/3.13  */14 public class MoveCircle extends View{15     public MoveCircle(Context context) {16         super(context);17     }18 19     public MoveCircle(Context context, AttributeSet attrs) {20         super(context, attrs);21     }22 23     public MoveCircle(Context context, AttributeSet attrs, int defStyleAttr) {24         super(context, attrs, defStyleAttr);25     }26 27     float currentX = 50.0f;28     float currentY = 50.0f;29 30     @Override31     protected void onDraw(Canvas canvas) {32         super.onDraw(canvas);33         Paint paint = new Paint();34         paint.setColor(Color.RED);35         canvas.drawCircle(currentX,currentY,10,paint);36     }37 38     @Override39     public boolean onTouchEvent(MotionEvent event) {40         super.onTouchEvent(event);41         currentX = event.getX();42         currentY = event.getY();43         //重繪44         invalidate();45         return  true;46 47     }48 }

自訂圓球

1 <ui.MoveCircle2        android:id="@+id/circle"3        android:layout_width="wrap_content"4        android:layout_height="wrap_content"5        android:minHeight="100dp"6        android:minWidth="100dp"7        />

XML

 

1 跟隨手指移動的球