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我想拍摄自定义警报视图的图像。我已经使用 buildDrawingCache 将 LinearLayout 转换为位图并且工作正常，但是当我尝试将自定义警报视图（使用 RelativeLayout）转换为位图时，它给了我一个错误。

//将视图转换为图像

private String getLayoutBitmap() {
        RelativeLayout view = (RelativeLayout) findViewById(R.id.glayer);
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bikeBm = view.getDrawingCache();

        File filePath = getFileStreamPath("twitterimage1.jpg");
        // delete saved image
        if (new File(filePath.toString()).delete()) {
            Log.i("INTERNAL_STORAGE_IMG_FILE", "deleted");
        }

        try {
            // Use the compress method on the Bitmap object to write image to
            // the OutputStream
            FileOutputStream fos = openFileOutput("twitterimage1.jpg",
                    Context.MODE_WORLD_READABLE);

            // Writing the bitmap to the output stream
            bikeBm.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.close();
        } catch (Exception e) {
            Log.e("saveToInternalStorage()", e.getMessage());
        }
        return filePath.toString();
    }

//例外

02-22 11:18:37.758: E/AndroidRuntime(21822): FATAL EXCEPTION: main
02-22 11:18:37.758: E/AndroidRuntime(21822): java.lang.NullPointerException
02-22 11:18:37.758: E/AndroidRuntime(21822):    at com.bike.app.ScoreClass.getLayoutBitmap(ScoreClass.java:435)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at com.bike.app.ScoreClass.initShareIntent(ScoreClass.java:475)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at com.bike.app.ScoreClass.access$0(ScoreClass.java:460)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at com.bike.app.ScoreClass$2.onClick(ScoreClass.java:156)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at android.view.View.performClick(View.java:3620)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at android.view.View$PerformClick.run(View.java:14292)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at android.os.Handler.handleCallback(Handler.java:605)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at android.os.Looper.loop(Looper.java:137)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at android.app.ActivityThread.main(ActivityThread.java:4507)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at java.lang.reflect.Method.invokeNative(Native Method)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at java.lang.reflect.Method.invoke(Method.java:511)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
02-22 11:18:37.758: E/AndroidRuntime(21822):    at dalvik.system.NativeStart.main(Native Method)
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