*RelativeLayout
 android:layout_below="@id/label"
 android:layout_alignParentRight="true"          android:layout_marginLeft="10dip"
 android:layout_toLeftOf="@id/ok"         android:layout_alignTop="@id/ok"
*TableLayout
android:stretchColumns="1"
android:layout_column="1"
*CheckBox isChecked()
*Event
Button  onClickListener
GridView onItemClickListener
ListView  onItemClickListener
CheckBox onClickListener
RadioButton onClickListener
Spinner  onItemSelectListener

*Canvas
 canvas.drawColor(Color.BLUE);

*paint用法示例
 canvas.drawColor(Color.BLUE);
     Paint paint=new Paint();
     paint.setAntiAlias(true);
     paint.setColor(Color.RED);
     //paint.setStyle(Style.STROKE);
     paint.setStrokeWidth(3);
    
    
    
     canvas.drawRect(0, 0, 100, 100, paint);
     canvas.drawCircle(100, 100,100, paint);    
     RectF rect=new RectF(0,100,200,200);
     canvas.drawRoundRect(rect, 15, 15, paint);     
     canvas.drawOval(rect, paint); 
    
     //Text
     paint.setTextSize(20);
     canvas.drawText("TestText", 0, 400, paint);
    
     paint.setStyle(Paint.Style.FILL);
     Shader shader=new LinearGradient(0, 0, 10, 10, new int[]{Color.BLACK,Color.RED,Color.GREEN}, null,Shader.TileMode.REPEAT);
     paint.setShader(shader);
     paint.setShadowLayer(45, 10, 10,Color.GRAY);
     //path
     Path path=new Path();
     path.moveTo(200, 200);
     path.lineTo(100, 300);
     path.lineTo(0, 200);
     path.close();
     canvas.drawPath(path, paint);

*Path 特效
PathEffect effect=new CornerPathEffect(10);
paint.setPathEffect(effect);