Android Canvas类介绍(zhuan)(2)

 
/* 线锁定画布 */  
canvas.save();  
/* 旋转画布 */  
canvas.rotate(45.0f);  
 
/* 设置颜色及绘制矩形 */  
mPaint.setColor(Color.RED);  
canvas.drawRect(new Rect(15, 15, 140, 70), mPaint);  
 
/* 解除画布的锁定 */  
canvas.restore();  
 
/* 设置颜色及绘制另一个矩形 */  
mPaint.setColor(Color.GREEN);  
canvas.drawRect(new Rect(150, 75, 260, 120), mPaint);  
}  
 
// 触笔事件  
public boolean onTouchEvent(MotionEvent event) {  
return true;  
}  
 
// 按键按下事件  
public boolean onKeyDown(int keyCode, KeyEvent event) {  
return true;  
}  
 
// 按键弹起事件  
public boolean onKeyUp(int keyCode, KeyEvent event) {  
return false;  
}  
 
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {  
return true;  
}  
 
public void run() {  
while (!Thread.currentThread().isInterrupted()) {  
try {  
Thread.sleep(100);  
} catch (InterruptedException e) {  
Thread.currentThread().interrupt();  
}  
// 使用postInvalidate可以直接在线程中更新界面  
postInvalidate();  
}  
}  
} 

作者“xfjt297857539”