捕获在触摸屏上的书写

时间:2015-05-29 10:36:27

标签: android capture touchscreen

我的应用程序要求用户可以在屏幕上书写签名。签名应该能够被提取到图像中。

我应该怎么做?

是否有现有的android进程/观察者?或者它们是否可能允许该功能的库/插件?

1 个答案:

答案 0 :(得分:0)

在Activity中使用此代码:

  try {
        GestureOverlayView gestureView = (GestureOverlayView) findViewById(R.id.signaturePad);
        gestureView.setDrawingCacheEnabled(true);
        Bitmap bm = Bitmap.createBitmap(gestureView.getDrawingCache());
        File f = new File(Environment.getExternalStorageDirectory()+ File.separator + "signature.png");
        f.createNewFile();
        FileOutputStream os = new FileOutputStream(f);
        os = new FileOutputStream(f);
        //compress to specified format (PNG), quality - which is ignored for PNG, and out stream
        bm.compress(Bitmap.CompressFormat.PNG, 100, os);
        os.close();

    } catch (Exception e) {

        Log.v("Gestures", e.getMessage());
        e.printStackTrace();
    }
}

在xml中:

<android.gesture.GestureOverlayView
        android:id="@+id/signaturePad"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="5"
        android:background="@android:color/white"
        android:eventsInterceptionEnabled="true"
        android:fadeEnabled="false"
        android:gestureColor="@android:color/black"
        android:gestureStrokeLengthThreshold="0.1"
        android:gestureStrokeType="multiple"
        android:orientation="vertical"/>