如何使用WebAppInterface（Javascript界面​​）操纵Android视图？

Question

我使用WebAppInterface在我的Android WebView运行时从Javascript中获取数据。在从Javascript中获取一些数据后，如何操纵我的Android视图？

public class WebAppInterface {
    Context mContext;

    /** Instantiate the interface and set the context */
    WebAppInterface(Context c) {
        mContext = c;
    }

    //This function can only be called by javascript
    @android.webkit.JavascriptInterface
    public void sendDataToJava(float currTime, String url) {

        videoUrl = url;
        videoTime = Math.round(currTime);

        //use references to views to change stuff
        videoView.seekTo(videoTime); //ERROR HERE
       //ERROR: Only the original thread that created a view hierarchy can touch its views


    }


}

Answer 1

您需要保持对包含活动的视图的引用，并使用activity.runOnUiThread方法使用runnable调用与视图相关的代码。

它看起来像这样：

public class WebAppInterface {
    Context mContext;
    Activity mActivity;

    /** Instantiate the interface and set the context */
    WebAppInterface(Context c, Activity a) {
        mContext = c;
        mActivity = a;

    }

    //This function can only be called by javascript
    @android.webkit.JavascriptInterface
    public void sendDataToJava(float currTime, String url) {

        videoUrl = url;
        videoTime = Math.round(currTime);

        mActivity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                videoView.seekTo(videoTime); 
            }
        });
    }

}