如何使画布眨眼和不变的自动旋转? [英] How to make a canvas blink and invariant to auto-rotate?
问题描述
我想使为Android定制的地图应用程序。我有地图的图像,我想给用户的立场作为一个闪烁的矩形。这里是code我写了到目前为止:
I am trying to make a custom map application for Android. I have the map as an image and I want to show the user's position as a blinking rectangle. Here is the code I have written so far:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView resultImageHolder = (ImageView) findViewById(R.id.test_image);
layout = (FrameLayout) findViewById(R.id.frame_layout);
draw();
}
private void draw() {
int width = 200;
int height = 200;
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
bitmap.eraseColor(Color.TRANSPARENT);
Paint paint = new Paint();
paint.setColor(Color.BLUE);
Canvas canvas = new Canvas(bitmap);
canvas.drawRect(19, 11, 30, 19, paint);
ImageView imageView = new ImageView(this);
imageView.setImageBitmap(bitmap);
layout.addView(imageView);
}
现在我需要做画布眨眼,也使画布留在正确的位置,即使屏幕自动旋转。我怎样才能做到既事?
Now I need to make the canvas blink and also make the canvas stay in its correct position even if the screen auto-rotates. How can I achieve both things?
推荐答案
有关旋转,你可以通过将其禁用安卓screenOrientation =画像
在活动部位你的表现。
对于眨眼,你可以有一个这样的计时器:
For the rotation you could disable it by putting android:screenOrientation="portrait"
in your Activity parts of your manifest.
For the blink you could have a timer like this:
Long timer = System.currentTimeMillis();
draw()
{
----
if(System.currentTimeMillis()>timer+100)
{
timer=System.currentTimeMillis();
canvas.drawRect(19, 11, 30, 19, paint);
}
您可以更改100到你认为合适的。另外一个问题你是从你给我们画仅调用一次。
You can change the 100 to what you see fit. Another issue you have is from what you showed us draw is only called once.
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