如何在ANDROID中获取表格布局单元的位置

Question

我在表布局中添加带有textview的动态行，而且我还希望该textview的xy坐标。 为此，我使用了view.getLocationOnScreen(loc)方法。

但是只显示最后一个项目的坐标，我想显示所有项目的坐标。

这是我的源代码，请为此提供帮助。

谢谢。

public class MainActivity extends Activity {
TextView tv1, tv2;
TableRow row;
TextView txt;
TableLayout tl;

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

    tl = (TableLayout) findViewById(R.id.tableLayout1);
    for (int i = 0; i <= 15; i++) {
        row = new TableRow(this);
        txt = new TextView(this);

        tl.addView(row);
        row.addView(txt);
        readLocation();
    }
}

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    // TODO Auto-generated method stub
    super.onWindowFocusChanged(hasFocus);
    readLocation();
}

private void readLocation() {
    int[] locationOnScreen = new int[2];
    txt.getLocationOnScreen(locationOnScreen);
    txt.setText(locationOnScreen[0] + " : " + locationOnScreen[1]);
}

}

和我下面的xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TableLayout
        android:id="@+id/tableLayout1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </TableLayout>
</ScrollView>

Answer 1

您不应该尝试以这种方式在onCreate方法中获取那些坐标，因为此时布局过程尚未完成。

这是根据您的代码进行了一些修改的演示：

public class MainActivity extends Activity {

ArrayList<TextView> txt = new ArrayList<TextView>();
TableLayout tl;

Handler _h = new Handler();

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

    tl = (TableLayout) findViewById(R.id.tableLayout1);
    for (Integer i = 0; i <= 15; i++) {
        TableRow therow = new TableRow(this);
        TextView thetxt = new TextView(this);

        therow.addView(thetxt);
        tl.addView(therow);

        txt.add(thetxt);

        thetxt.setText("stub");
    }

    tl.requestLayout();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
protected void onResume() {
    super.onResume();
    _h.postDelayed(new Runnable() {

        @Override
        public void run() {

            for (Integer i = 0; i <= 15; i++) {

                TextView thetxt = txt.get(i);

                int[] locationOnScreen = new int[2];
                thetxt.getLocationOnScreen(locationOnScreen);
                thetxt.setText(locationOnScreen[0] + " : " + locationOnScreen[1]);
            }        


        }
    }, 1000);

}

}

关键点是onResume中的postDelayed ，可让系统正确postDelayed所有视图。