Question

我想保存框架布局，其中我设置了背景，另一个图像放在其顶部当我使用onclick按钮时，它会给我'强制关闭错误'。

我使用以下代码：

 FrameLayout mainLayout = (FrameLayout) findViewById(R.id.imageView);
 File root = Environment.getExternalStorageDirectory();
 File file = new File(root,"androidlife.jpg");
 Bitmap b = Bitmap.createBitmap(mainLayout.getWidth(), mainLayout.getHeight(), Bitmap.Config.ARGB_8888);
 Canvas c = new Canvas(b);
 mainLayout.draw(c);
 FileOutputStream fos = null;
 try {
    fos = new FileOutputStream(file);

    if (fos != null) {
       b.compress(Bitmap.CompressFormat.JPEG, 90, fos);
       fos.close();
    }
 } catch (Exception e) {
    e.printStackTrace();
 }

这是错误日志：

05-03 00:39:37.281: W/dalvikvm(445): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-03 00:39:37.301: E/AndroidRuntime(445): FATAL EXCEPTION: main
05-03 00:39:37.301: E/AndroidRuntime(445): java.lang.ClassCastException: android.widget.ImageView
05-03 00:39:37.301: E/AndroidRuntime(445):  at org.example.touch.Touch$1.onClick(Touch.java:60)
05-03 00:39:37.301: E/AndroidRuntime(445):  at android.view.View.performClick(View.java:2408)
05-03 00:39:37.301: E/AndroidRuntime(445):  at android.view.View$PerformClick.run(View.java:8816)
05-03 00:39:37.301: E/AndroidRuntime(445):  at android.os.Handler.handleCallback(Handler.java:587)
05-03 00:39:37.301: E/AndroidRuntime(445):  at android.os.Handler.dispatchMessage(Handler.java:92)
05-03 00:39:37.301: E/AndroidRuntime(445):  at android.os.Looper.loop(Looper.java:123)
05-03 00:39:37.301: E/AndroidRuntime(445):  at android.app.ActivityThread.main(ActivityThread.java:4627)
05-03 00:39:37.301: E/AndroidRuntime(445):  at java.lang.reflect.Method.invokeNative(Native Method)
05-03 00:39:37.301: E/AndroidRuntime(445):  at java.lang.reflect.Method.invoke(Method.java:521)
05-03 00:39:37.301: E/AndroidRuntime(445):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-03 00:39:37.301: E/AndroidRuntime(445):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-03 00:39:37.301: E/AndroidRuntime(445):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

问题是你这样做：

FrameLayout mainLayout = (FrameLayout) findViewById(R.id.imageView);

而R.id.imageView很可能是对ImageView的引用。你最好做点什么：

ImageView mainLayout = (ImageView) findViewById(R.id.imageView);

将分层图像保存到SD卡

1 个答案: