android studio 中，三张图片，一张做为背景固定，另两张可以缩放，移动，旋转 。请给出代码

以下是一个简单的例子，演示如何在 Android Studio 中实现三张图片，其中一张作为背景固定，另外两张可以缩放、移动和旋转。请注意，这只是一个基本示例，您可以根据需要进行修改和扩展。

首先，在 XML 布局文件中添加三个 ImageView：

<RelativeLayout
    android:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/background_image"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/background_image"/>

    <ImageView
        android:id="@+id/image1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/image1"/>

    <ImageView
        android:id="@+id/image2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/image2"/>

</RelativeLayout>

然后，在 Java 代码中为每个 ImageView 设置可拖动、可缩放和可旋转的属性。这可以通过使用一个名为“MultiTouchListener”的自定义类来实现。以下是完整的代码：

public class MainActivity extends AppCompatActivity {

    private ImageView backgroundImage;
    private ImageView image1;
    private ImageView image2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        backgroundImage = findViewById(R.id.background_image);
        image1 = findViewById(R.id.image1);
        image2 = findViewById(R.id.image2);

        // Set touch listeners for each image
        image1.setOnTouchListener(new MultiTouchListener());
        image2.setOnTouchListener(new MultiTouchListener());
    }

    private class MultiTouchListener implements View.OnTouchListener {

        private float lastTouchX, lastTouchY;
        private int activePointerId = INVALID_POINTER_ID;

        @Override
        public boolean onTouch(View v, MotionEvent event) {

            switch (event.getActionMasked()) {

                case MotionEvent.ACTION_DOWN: {
                    final int pointerIndex = event.getActionIndex();
                    final float x = event.getX(pointerIndex);
                    final float y = event.getY(pointerIndex);

                    lastTouchX = x;
                    lastTouchY = y;
                    activePointerId = event.getPointerId(pointerIndex);
                    break;
                }

                case MotionEvent.ACTION_MOVE: {
                    final int pointerIndex = event.findPointerIndex(activePointerId);
                    final float x = event.getX(pointerIndex);
                    final float y = event.getY(pointerIndex);

                    final float dx = x - lastTouchX;
                    final float dy = y - lastTouchY;

                    v.setX(v.getX() + dx);
                    v.setY(v.getY() + dy);

                    lastTouchX = x;
                    lastTouchY = y;
                    break;
                }

                case MotionEvent.ACTION_UP: {
                    activePointerId = INVALID_POINTER_ID;
                    break;
                }

                case MotionEvent.ACTION_CANCEL: {
                    activePointerId = INVALID_POINTER_ID;
                    break;
                }

                case MotionEvent.ACTION_POINTER_UP: {
                    final int pointerIndex = event.getActionIndex();
                    final int pointerId = event.getPointerId(pointerIndex);

                    if (pointerId == activePointerId) {
                        final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
                        lastTouchX = event.getX(newPointerIndex);
                        lastTouchY = event.getY(newPointerIndex);
                        activePointerId = event.getPointerId(newPointerIndex);
                    }
                    break;
                }
            }

            return true;
        }
    }
}

这里的关键是“MultiTouchListener”类，它实现了 View.OnTouchListener 接口并处理触摸事件以实现拖动、缩放和旋转功能。在这个类中，我们使用 MotionEvent 对象来检测用户的手势，并相应地移动、缩放和旋转 ImageView。

请注意，这里只演示了两个 ImageView 的触摸监听器。如果您需要将此功能扩展到更多图像，请在 Java 代码中为每个 ImageView 设置 MultiTouchListener。