Programmatic RelativeLayout重叠

Question

我从代码实现相对布局时遇到了问题。 我想要的是，TextView1位于左侧，TextView2位于屏幕右侧一行。

它从XML正常工作，但从代码做这不......可能是什么原因？

这项工作就好了：

<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> 

这不工作（给元素的重叠）：

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); 

但是这将很好地工作：（与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不完全匹配，重叠是因为您h AVE忘记：

lp2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); 

您还忽略了：

lp1.addRule(RelativeLayout.CENTER_VERTICAL); 

并且您正在使用MATCH_PARENT的宽度，而不是WRAP_CONTENT。