Question

目前我的设置包括智能手机和通过MHL连接的微型投影仪。我可以通过Presentation API将图像发送到投影仪，没有任何问题。但现在我来到了这一点，我必须积极操纵第二个屏幕。我几乎找不到任何信息。

基本上我想结合这两种技巧： https://github.com/vogellacompany/codeexamples-android/blob/master/com.vogella.android.multitouch/src/com/vogella/android/multitouch/MultitouchView.java用于多点触控并绘制触摸的坐标和

http://blog.stylingandroid.com/multiple-displays-part-2/用于在MHL-Screen上显示它。

我不是Android专家，因此我不知道如何正确设置布局，因为我在一个屏幕上处于活动状态，而另一个屏幕上必须显示某些内容。第一个屏幕的背景是顺便提一下的图像..

有人熟悉这个吗？

更新：我试图将这两个功能结合起来，但我很难实现它。一个（画布）扩展了视图，另一个演示文稿看起来不能很好地协同工作。如何在第二个屏幕上创建视图并将X / Y坐标显示为圆圈？有什么想法吗？

Answer 1

我找到了一种解决问题的解决方案。它的演示部分来自基本的演示示例。我无法使用画布来管理它，所以我根据X / Y坐标移动图像。

public class MainActivity extends Activity {

    //Initiate Presentation
    private DisplayManager mDisplayManager;
    private final SparseArray<RemotePresentation> mActivePresentations = new SparseArray<RemotePresentation>();
    private Display current=null;
    private boolean isFirstRun=true;

    PointF f = new PointF();
    int i = 0;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.toucheventlayout);


        //setContentView(R.layout.layout_mainactivity);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        //Some Presentation stuff - Connect to external Display
        mDisplayManager = (DisplayManager)getSystemService(Context.DISPLAY_SERVICE);

        Display[] displays= mDisplayManager.getDisplays(DisplayManager.DISPLAY_CATEGORY_PRESENTATION);
        if (displays.length != 0) {

            //Setup external Display as default display for Pinholes
            if (current != null || isFirstRun) {
                isFirstRun = false;
                current=displays[0];
            }
        }

        //start presentation
        //showPresentation(current, 1, 1);
    }


    private void showPresentation(Display display, float x, float y) {

        if(display!=null){

            RemotePresentation presentation = new RemotePresentation(this, display);
            presentation.x = x;
            presentation.y = y;
            mActivePresentations.put(display.getDisplayId(), presentation);

            presentation.show();
        }
    }


    private void hidePresentation(Display display) {
        final int displayId = display.getDisplayId();
        RemotePresentation presentation = mActivePresentations.get(displayId);
        if (presentation == null) {
            return;
        }
        presentation.dismiss();
        mActivePresentations.delete(displayId);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        // get pointer index from the event object
        int pointerIndex = event.getActionIndex();

        // get pointer ID
        int pointerId = event.getPointerId(pointerIndex);

        // get masked (not specific to a pointer) action
        int maskedAction = event.getActionMasked();

        switch (maskedAction) {

            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_POINTER_DOWN: {

                break;
            }
            case MotionEvent.ACTION_MOVE: { // a pointer was moved
                if(i >20){                 // Keep it at low memory!
                    f.x = event.getX(pointerIndex);
                    f.y = event.getY(pointerIndex);

                    showPresentation(current, f.x, f.y);
                i = 0;
                }
                i++;
                break;
            }
            case MotionEvent.ACTION_UP:
                hidePresentation(current);
            case MotionEvent.ACTION_POINTER_UP:
            case MotionEvent.ACTION_CANCEL: {

                break;
            }
        }

        return true;
    }

class RemotePresentation extends Presentation {
    public RemotePresentation(Context context, Display display) {
        super(context, display);
    }

    private ImageView image;
    float x = 0;
    float y = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.remote_display);

        image  = (ImageView) findViewById(R.id.imageView1);
        placeImage(x, y);
    }

    private void placeImage(float X, float Y) {

        image.setTranslationX(X);
        image.setTranslationY(Y);
    }


}



}

发生Anoter问题：一段时间后，应用程序因内存溢出而崩溃..任何想法可能是什么问题？

在Android中使用OnGestureDetection和Presentation API在第二个屏幕上绘图？

1 个答案: