旋转视图层次90度 [英] Rotate View Hierarchy 90 degrees

问题描述

我工作的FrameLayout的子类，应该是90度旋转所有的孩子。我这样做是为了克服景观，只有相机的限制present在安卓2.1及以下的，由具有活性的是风景，而是把我的相机覆盖到这个的FrameLayout叠加使其看起来好像它是纵向（ 这是拉亚是怎么做的）要做到这一点，我适应的Jeff夏基的code 旋转的观点。我的问题是，我可以旋转的FrameLayout，但我不能调整大小以匹配新的尺寸。而不是在景观一个小480x320摄像机视图一个小320x480纵向视图所以在我的G1，我得到一个最高320x320箱，中间显示我与剁掉两侧纵向视图。

I am working on a subclass of FrameLayout that is supposed to rotate all of its children by 90 degrees. I am doing this to overcome the landscape-only camera limitation present in android 2.1 and below, by having the activity be in landscape, but placing my camera overlay into this framelayout overlay to cause it to appear as if it was portrait (this is how Layar does it) To accomplish this, I'm adapting Jeff Sharkey's code to rotate views. My problem is that I can rotate the Framelayout, but I cannot resize it to match the new dimensions. So on my g1, instead of a 320x480 portrait view over a 480x320 camera view in landscape, I get a 320x320 box in the middle showing my portrait view with the sides chopped off.

下面是我的code到目前为止：

Here is my code so far:

public class RotateLayout extends FrameLayout {
    private Matrix mForward = new Matrix();
    private Matrix mReverse = new Matrix();
    private float[] mTemp = new float[2];

    public RotateLayout(Context context) {
        super(context);
    }

    public RotateLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

    }


    /* (non-Javadoc)
     * @see android.widget.FrameLayout#onMeasure(int, int)
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        //This didn't work:
        //super.onMeasure(heightMeasureSpec, widthMeasureSpec);
    }

    /* (non-Javadoc)
     * @see android.widget.FrameLayout#onSizeChanged(int, int, int, int)
     */
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        canvas.rotate(270, getWidth()/2, getHeight()/2);
        //This code will stretch the canvas to accommodate the new screen size. This is not what I want.
        //float scaleX=(float)getHeight()/getWidth();
        //float scaleY=(float)getWidth()/getHeight();
        //canvas.scale(scaleX, scaleY,  getWidth()/2, getHeight()/2);
        mForward = canvas.getMatrix();
        mForward.invert(mReverse);
        canvas.save();
        canvas.setMatrix(mForward); //This is the matrix we need to use for proper positioning of touch events
        super.dispatchDraw(canvas);
        canvas.restore();
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        final float[] temp = mTemp;
        temp[0] = event.getX();
        temp[1] = event.getY();

        mReverse.mapPoints(temp);

        event.setLocation(temp[0], temp[1]);
        return super.dispatchTouchEvent(event);
    }
}

我试图重写 OnMeasure 切换X和观的Y标注，但一直没能得到那个工作。 任何帮助，您可以提供大大AP preciated。

I have tried overriding OnMeasure to switch the X and Y dimensions of the View, but have not been able to get that to work. Any help you can provide is greatly appreciated.

推荐答案

我有同样的问题，并设法解决它。 相反，旋转每个视图或手工布局，我用了LayoutAnimationController。

I had the same problem and managed to solve it. Instead of rotating each view or the layout by hand, I used a LayoutAnimationController.

首先将文件/ RES /动画/被叫rotation.xml

First, place a file in /res/anim/ called rotation.xml

<?xml version="1.0" encoding="utf-8"?>
<rotate
 xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:toDegrees="-90"
    android:pivotX="50%"
    android:pivotY="50%"
    android:duration="0" android:fillAfter="true">
</rotate>

然后，在你活动的onCreate，执行

Then, in your Activity's onCreate, do

  @Override
  public void onCreate(Bundle icicle) {
  super.onCreate(icicle);

     setContentView(R.layout.myscreen);

     Animation rotateAnim = AnimationUtils.loadAnimation(this, R.anim.rotation);
     LayoutAnimationController animController = new LayoutAnimationController(rotateAnim, 0);
     FrameLayout layout = (FrameLayout)findViewById(R.id.MyScreen_ContentLayout);
     layout.setLayoutAnimation(animController);
 }

如果您要旋转摆在上方的摄像头preVIEW视图（SurfaceHolder）元素，只需将上述SurfaceHolder一个的FrameLayout，把你在的FrameLayout的所有元素，并调用布局MyScreen_ContentLayout。完成。

If you want to rotate elements that lie above your camera preview view (SurfaceHolder), simply place a FrameLayout above the SurfaceHolder, place all your elements in that FrameLayout and call the Layout "MyScreen_ContentLayout". Done.

希望这有助于有人出来，我花了相当长一段时间让一切融合在一起。

Hope that helped someone out, took me quite a while to get everything together.

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