如何在Android上运行Pinch-Zoom示例？

Question

To run an example on android to use PinchZoom I found the following example . I was able to write a working example code which shows the View from the example - but it is all white! How can I use an actual image in this example?

I tried the following in the activity-xml:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res-auto"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF"
    android:orientation="vertical" >

    <com.example.alexander.capycoding_pinchzoom.CanvasView
        android:id="@+id/signature_canvas"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/image"
        android:textColor="#FFFFFF" />
</FrameLayout>

to use an actual non-white image, but it does not work. (I also renamed the class from ZoomableImageView to CanvasView ).

Maybe there is another/better example on how to make PinchZoom workable on a Canvas/Bitmap in android?

Answer 1

您正在xml中使用默认图像。使用您的图像，顺便说一句，仅放置xml不能单独执行操作。我建议使用库文件进行缩放，然后为缩放规范创建一个类