试图在android中旋转布局，画布似乎不会旋转 _Android

盛年不重来，一日难再晨，及时当勉励，岁月不待人。这篇文章主要讲述试图在android中旋转布局，画布似乎不会旋转相关的知识，希望能为你提供帮助。
我已经学习了教程here（它在触摸/拖动时动态旋转图像）并试图用整个布局而不是仅仅一个图像重构它，所以我从TutorialActivity改变了rotateDialer（）方法，如下所示：

private void rotateDialer(float degrees) { //matrix.postRotate(degrees, dialerWidth / 2, dialerHeight / 2); //dialer.setImageMatrix(matrix); dialer.setNextRotation(degrees, dialerWidth / 2, dialerHeight/ 2); dialer.invalidate(); info.setText("Current Quadrant Touched = "+currentQuadrantTouched +" Angle = "+degrees); }

其中dialer是一个自定义布局我用一个重写的onDraw（）方法创建，该方法旋转画布但在setNextRotation（）方法中设置了多个度数，但画布似乎没有旋转！这是我的自定义布局：

import android.content.Context; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.drawable.BitmapDrawable; import android.util.AttributeSet; import android.util.Log; import android.view.LayoutInflater; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.RelativeLayout; public class DialView extends FrameLayout { public static final String LOG_TAG = "DialView"; RelativeLayout dialView; float degrees; float px; float py; public DialView(Context context) { super(context); init(); // TODO Auto-generated constructor stub }public DialView(Context context, AttributeSet attrs) { super(context, attrs); init(); // TODO Auto-generated constructor stub } public DialView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub init(); }private void init() { //initialise rotation this.degrees = 0; this.px = 0; this.py = 0; LayoutInflater inflator = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); dialView = (RelativeLayout) inflator.inflate(R.layout.dial_view, this,false); addView(dialView); Log.d(LOG_TAG, "DialView: init() "+ degrees+"degrees around ("+getWidth() / 2+","+getHeight() / 2+")"); }public void setNextRotation(float degrees, float px, float py) { this.degrees = degrees; this.px = px; this.py = py; Log.d(LOG_TAG, "Next Rotation = "+ degrees+"degrees around ("+px+","+py+")"); }@Override protected void onDraw(Canvas canvas) { canvas.save(); // canvas.rotate(45,< appropriate x pivot value> ,< appropriate y pivot value> ); canvas.rotate(degrees, px, py); Log.d(LOG_TAG, "onDraw: Rotation = "+ degrees+"degrees around ("+px+","+py+")"); super.onDraw(canvas); canvas.restore(); }}

这是dial_view.xml：

< ImageView android:id="@+id/topLeftImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="38dp" android:clickable="true" android:layout_marginTop="28dp" android:src="https://www.songbingjia.com/android/@drawable/icon" /> < ImageView android:id="@+id/topRightImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:clickable="true" android:layout_alignParentRight="true" android:layout_marginRight="50dp" android:src="https://www.songbingjia.com/android/@drawable/icon" /> < ImageView android:id="@+id/bottomLeftImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:clickable="true" android:layout_marginBottom="24dp" android:layout_marginLeft="22dp" android:src="https://www.songbingjia.com/android/@drawable/icon" /> < ImageView android:id="@+id/bottomRightImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:clickable="true" android:layout_alignParentRight="true" android:layout_marginRight="28dp" android:src="https://www.songbingjia.com/android/@drawable/icon" /> < /RelativeLayout>

为什么画布不会明显旋转？在计算度数后，我在onTouch（）中使拨号器无效，并且计算工作正常（我正在更改日志中的值）但视图似乎没有旋转，我在做什么错误？
答案好吧事实证明onDraw（）方法从未被调用过，我只是简单地添加