Question

我正在以编程方式将视图添加到垂直linearlayout。所有视图都是从相同的XML生成的。但是如果我在每个视图上调用View.getY（），它将返回相同的y值。为什么会这样？如何让它返回正确的Y值？

成为膨胀的XML代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <RelativeLayout
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_margin="50dp"
        android:id="@+id/myView"
        android:background="@color/colorAccent">

    </RelativeLayout>
</RelativeLayout>

预览要膨胀的XML：

Java代码：

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final LinearLayout host = ((LinearLayout) findViewById(R.id.host)); //Linear Layout to hold the views, orientation = vertical

        //Creating the views and adding them to a list
        final ArrayList<MyObject> myObjects = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            myObjects.add(MyObject.createNewObject(this, host));
        }

        //Waiting for the screen to be drawn
        host.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                //get the Y position of each pink box
                for (MyObject m : myObjects) {
                    Log.v("MYOBJECT", "Y pos: " + String.valueOf(m.myPartView.getY()));
                }
                host.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            }
        });
    }
}

class MyObject {
    View myWholeView;
    View myPartView;

    private MyObject(View myWholeView, View myPartView) {
        this.myWholeView = myWholeView;
        this.myPartView = myPartView;
    }

    public static MyObject createNewObject(Context context, LinearLayout host) {
        View v = LayoutInflater.from(context).inflate(R.layout.layout, host, true); //Inflating the XML Layout
        View other = v.findViewById(R.id.myView); //This is the little pink box 
        return new MyObject(v, other);
    }
}

我运行了代码，结果如下：

正确生成的XML：

记录：

04-07 15:35:39.811 20695-20695/com.pythogen.tester V/MYOBJECT: Y pos: 150.0
04-07 15:35:39.811 20695-20695/com.pythogen.tester V/MYOBJECT: Y pos: 150.0
04-07 15:35:39.811 20695-20695/com.pythogen.tester V/MYOBJECT: Y pos: 150.0

为什么所有Y位置都一样？我可以让他们与众不同吗？

Answer 1

您获得的价值与其父母相关，这就是为什么您总能得到相同的价值。如果您想在屏幕上显示该位置，可以使用View.getLocationOnScreen()。

View.getY（）没有返回正确的位置

1 个答案: