java - Android Studio AddView TableLayout，必须removeChild错误？

Question

我试图将 AddView 添加到我的 TableLayout 中，同时将每行上的项目数量限制为 5，所以如果我有 3 个项目，它将生成 1 行，6 个项目将加载 2 个项目，11 个项目将加载 3 个项目，等等。我是使用 Android 还很陌生，所以这可能是一个简单的修复，请告诉我。`

    final TableLayout t1 = (TableLayout) findViewById(R.id.t1); //TableLayout to expand
    final TableRow tr1 = new TableRow(this); //Row 1 0-5 items
    final TableRow tr2 = new TableRow(this); // Row 2 6-10 itmes
    final TableRow tr3 = new TableRow(this);
    final TableRow tr4 = new TableRow(this);


    final Button finalBtn = btn; //Button that triggers Action

    btn.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
        @Override
        public void onClick(View view) {
            // Initialize a new ImageView widget
            if (array_Killerimage.size() <= 5)
            {
                tl.addView(tr1); //Crashes on all these lines
            }
            if (array_Killerimage.size() <= 10)
            {
                t1.addView(tr1);
                tl.addView(tr2);
            }
            if (array_Killerimage.size() <= 15)
            {
                t1.addView(tr1);
                t1.addView(tr2);
                t1.addView(tr3);
            }
            if (array_Killerimage.size() <= 20)
            {
                tl.addView(tr1);
                tl.addView(tr2);
                tl.addView(tr3);
                tl.addView(tr4);

            }

错误日志

  Process: com.example.appv2, PID: 11200
java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
    at android.view.ViewGroup.addViewInner(ViewGroup.java:5122)
    at android.view.ViewGroup.addView(ViewGroup.java:4953)
    at android.widget.TableLayout.addView(TableLayout.java:427)
    at android.view.ViewGroup.addView(ViewGroup.java:4893)
    at android.widget.TableLayout.addView(TableLayout.java:409)
    at android.view.ViewGroup.addView(ViewGroup.java:4866)
    at android.widget.TableLayout.addView(TableLayout.java:400)
    at com.example.appv2.Main4Activity$1.onClick(Main4Activity.java:) //Line of interest
    at android.view.View.performClick(View.java:6892)
    at android.widget.TextView.performClick(TextView.java:12693)
    at android.view.View$PerformClick.run(View.java:26101)
    at android.os.Handler.handleCallback(Handler.java:789)
    at android.os.Handler.dispatchMessage(Handler.java:98)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6944)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

Answer 1

这意味着您要添加到 TabelLayout 的 View 已经有一个父 View 。您可以简单地从其父 View 中删除 View ，然后再添加到新的容器(TabelLayout)

在添加 View 之前进行此更改。

if (view.getParent() != null) {
        ((ViewGroup) view.getParent()).removeView(view);
   }
tabelLayout.addView(view);

注意:您只能添加没有父级的 View ，或者换句话说，您只能添加尚未添加到 View 树中的 View ，一旦添加，您应该从其父级中删除该 View ，然后才能添加到另一位家长。

编码愉快!!