Question

我希望在LinearLayout向ImageView2滑动时检查ImageView与ImageView2之间的交集。我使用了Rect，但是它没有工作，ImageView2只是通过它而没有相交。请帮帮我!!

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true" >


<ImageView
    android:id="@+id/tile"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:src="@drawable/tile" />

   <LinearLayout
    android:id="@+id/l1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:weightSum="100" >

    <ImageView
        android:id="@+id/b1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="50"
        android:background="#000"
        android:src="@drawable/b" />

    <ImageView
        android:id="@+id/b2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="70dp"
        android:layout_weight="50"
        android:background="#000"
        android:src="@drawable/b" />
</LinearLayout>

@SuppressLint("NewApi") 
public class MainActivity extends Activity {
    Rect tileRect = new Rect();
    Rect b1Rect = new Rect();
    Rect b2Rect = new Rect();
    ImageView tile,b1,b2;
    RelativeLayout layout;
    LinearLayout l1;

    final Handler h = new Handler();
    Boolean tileRight=false;



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


        init();
         move();

    }


    private void init() {
        // TODO Auto-generated method stub




        b1 = (ImageView)findViewById(R.id.b1);
        b2 = (ImageView)findViewById(R.id.b2);
        tile = (ImageView)findViewById(R.id.tile);
        layout = (RelativeLayout)findViewById(R.id.layout);
        l1 = (LinearLayout)findViewById(R.id.l1);
         tile.setX(320);
        tile.setY(800);


        l1.setVisibility(View.VISIBLE);

    }


    public void move()
    {
        final int delay = 45;
        h.postDelayed(new Runnable()
        {

            @Override
            public void run() {
                // TODO Auto-generated method stub

                layout.setOnTouchListener(new View.OnTouchListener() {

                    @Override
                    public boolean onTouch(View arg0, MotionEvent event) {
                        // TODO Auto-generated method stub

                        if(event.getAction() == MotionEvent.ACTION_UP)
                        {

                            if(tileRight==true)
                                tileRight=false;
                            else
                                tileRight=true;

                        return true;
                        }

                        return false;
                    }
                });


            if(tileRight==true)
            {
              if(tile.getX()>600f)
              {
                  tile.setX(tile.getX()); 
              }

              else{
                tile.setX(tile.getX()+speedTile);

                    }
            }
            else{
                 if(tile.getX()<40f)
                  {
                      tile.setX(tile.getX()); 
                  }
                 else{
                tile.setX(tile.getX()-speedTile);

                 }

            }

            tile.getHitRect(tileRect);
            b1.getHitRect(b1Rect);
            b2.getHitRect(b2Rect);

            if(Rect.intersects(tileRect, b1Rect) || Rect.intersects(tileRect, b2Rect))
            {
                gameOver();

            }



            l1.setY(l1.getY()+10f);


            h.postDelayed(this, delay);
            }



        },delay);


    }
    private void gameOver() {

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

Answer 1

Android的View具有getLocationOnScreen（）方法，可以显示视图的绝对位置。 https://developer.android.com/reference/android/view/View.html#getLocationOnScreen(int[])

Answer 2

出现此问题的原因是在布局膨胀之前使用了view.getHitRect（）。

任何视图的位置或测量API（如getWidth（），getTop（），getRight（）等）都将返回0（getHitRect（）使用（0,0,0,0）初始化Rect）在视图膨胀之前的onCreate（）或onResume（）中。

在您的情况下，处理程序的延迟时间似乎比查看通货膨胀更早地执行交叉逻辑。

您可以从视图中post，run()方法会在视图膨胀后执行，然后获取视图的测量参数或Rect。< / p>

以下是一个例子：

public class MyTestActivity extends AppCompatActivity{ int mNumberOfViewsInitialized = 0; ImageView mImageViewRight, mImageViewLeft; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.sliding_image_activity); mImageViewLeft = (ImageView) findViewById(R.id.image_view_left); mImageViewRight = (ImageView) findViewById(R.id.image_view_right); // calling method here will log that the views do not intersect // which happens because they haven't been inflated yet. // doViewsOverlap(); mImageViewLeft.post(new Runnable(){ @Override public void run() { mNumberOfViewsInitialized++; intersectionLogic(); } }); mImageViewRight.post(new Runnable(){ @Override public void run() { mNumberOfViewsInitialized++; intersectionLogic(); } }); } private void intersectionLogic(){ /* the constant could be something else, depending on the number of views you'd like to test intersection for*/ if(mNumberOfViewsInitialized == 2){ doViewsOverlap(mImageViewLeft,mImageViewRight); } } private void doViewsOverlap(final View firstView, final View secondView){ Rect leftRect = new Rect(); firstView.getHitRect(leftRect); Rect rightRect = new Rect(); secondView.getHitRect(rightRect); if(Rect.intersects(leftRect,rightRect) || Rect.intersects(rightRect,leftRect)) Log.v("intersects","views intersect"); else Log.v("intersects","views do not intersect"); } }

我使用了一个不动画/移动图像的布局，但是当移动图像时也会出现同样的问题

<ImageView android:id="@+id/image_view_left" android:layout_width="300dp" android:layout_height="300dp" android:layout_alignParentLeft="true" android:background="@android:color/holo_blue_dark" android:src = "@mipmap/ic_launcher"/> <ImageView android:id="@+id/image_view_right" android:layout_width="300dp" android:layout_height="300dp" android:layout_alignParentRight="true" android:background="@android:color/holo_green_dark" android:gravity="end" android:src="@mipmap/ic_launcher"/>

RelativeLayout中包含的图片。

以下是用户界面的截图：

此问题与此相关：If I call getMeasuredWidth() or getWidth() for layout in onResume they return 0

希望这有帮助。

在不同的布局中相交两个图像

2 个答案: