java - 以编程方式 RelativeLayout.ALIGN_RIGHT 与给定的 View.getId() 不工作

Question

我尝试以编程方式将 TextView 与按钮的右/下边缘对齐。但是，此静态 xml 代码正在运行:

<RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textView10"
        android:layout_alignRight="@+id/button"
        android:layout_alignBottom="@+id/button" />
</RelativeLayout>

如果我尝试通过代码来完成，它是行不通的。默认情况下，TextView 正在顶部/左侧对齐。RelativeLayout.ALIGN_RIGHT 和 ALIGN_BOTTOM 似乎被忽略了......

            // Adding the LinearLayout
  LinearLayout linearLayout = new LinearLayout(getContext());
  linearLayout.setOrientation(LinearLayout.VERTICAL);
  linearLayout.setLayoutParams(new LinearLayout.LayoutParams(
          LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT, 1.0f));

            final LinearLayout.LayoutParams LLParamsCont = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.WRAP_CONTENT, Utils.dpToPx(getContext(), 50));

                    // Adding the RelativeLayout
        RelativeLayout relativeLayout = new RelativeLayout(getContext());
        relativeLayout.setLayoutParams(LLParamsCont);

                    // Adding the Button
        Button button = new Button(getContext());
        button.setLayoutParams(new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
        relativeLayout.addView(button)

                    // Adding the TextView
        TextView textView = new TextView(getContext());
        textView.setGravity(Gravity.CENTER_HORIZONTAL);
        RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
                Utils.dpToPx(getContext(), 20),
                Utils.dpToPx(getContext(), 20));
        layoutParams.addRule(RelativeLayout.ALIGN_RIGHT, button.getId());        // <== THIS DOESN'T SEEM TO WORK
        layoutParams.addRule(RelativeLayout.ALIGN_BOTTOM, button.getId());       // <== THIS DOESN'T SEEM TO WORK
        textView.setLayoutParams(layoutParams);
        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 12);
        textView.setGravity(Gravity.CENTER);
        textView.setBackgroundResource(R.drawable.score_count);
        relativeLayout.addView(textView);

        linearLayout.addView(relativeLayout)

TextView 只是没有与 Button 的右/底线对齐。

有谁知道为什么这不是通过代码工作，而是通过静态 xml 工作？我错过了什么？

谢谢!

谨致问候，于尔根

Answer 1

尝试在创建规则之前为按钮设置一个唯一的 id(更多信息 here)。

Button button = new Button(getContext());
button.setId(View.generateViewId()); //this utility method is API 17!