程序化RelativeLayout重叠

Question

我在代码中实现相对布局时遇到了一个问题。我想要的是，TextView1位于屏幕的左侧，TextView2位于屏幕右侧的一行。

它在XML中工作得很好，但是在代码中做不到……可能的原因是什么？

这个工作很好：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="@string/hello_world" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="TextView" />

</RelativeLayout>

这不起作用(给出了元素的重叠)：

RelativeLayout rel = new RelativeLayout(this);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
        LayoutParams.WRAP_CONTENT);
rel.setLayoutParams(params);

TextView t1 = new TextView(this);   
t1.setText("balbla_1");
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(
        RelativeLayout.LayoutParams.MATCH_PARENT,
        RelativeLayout.LayoutParams.WRAP_CONTENT);
lp1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
t1.setLayoutParams(lp1);

TextView t2 = new TextView(this);
t2.setText("balbla_2");
RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(
        RelativeLayout.LayoutParams.MATCH_PARENT,
        RelativeLayout.LayoutParams.WRAP_CONTENT);
lp2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
t2.setLayoutParams(lp2);        

rel.addView(t1);
rel.addView(t2);

setContentView(rel);

但这将很好地工作：(用WRAP_CONTENT替换MATCH_PARENT )：

RelativeLayout rel = new RelativeLayout(this);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
        LayoutParams.WRAP_CONTENT);
rel.setLayoutParams(params);

TextView t1 = new TextView(this);   
t1.setText("balbla_1");
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(
        RelativeLayout.LayoutParams.WRAP_CONTENT,
        RelativeLayout.LayoutParams.WRAP_CONTENT);
lp1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
t1.setLayoutParams(lp1);

TextView t2 = new TextView(this);
t2.setText("balbla_2");
RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(
        RelativeLayout.LayoutParams.WRAP_CONTENT,
        RelativeLayout.LayoutParams.WRAP_CONTENT);
lp2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
t2.setLayoutParams(lp2);        

rel.addView(t1);
rel.addView(t2);

setContentView(rel);

Answer 1

Java代码与XML并不完全匹配，重叠是因为您忘记了：

lp2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);

你也忽略了：

lp1.addRule(RelativeLayout.CENTER_VERTICAL);

并且您正在使用MATCH_PARENT而不是WRAP_CONTENT作为宽度。