如何以编程方式向RelativeLayout添加视图？

Question

你能给我一个非常简单的例子，在给定的位置以编程方式将子视图添加到RelativeLayout？

例如，要体现以下XML：

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

<TextView 
    android:id="@+id/textView1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:layout_marginLeft="107dp" 
    android:layout_marginTop="103dp" 
    android:text="Large Text" 
    android:textAppearance="?android:attr/textAppearanceLarge" /> 

我不知道如何创建一个合适的RelativeLayout.LayoutParams实例。

Answer 1

这里有一个例子，让你开始，在填写其余如适用：

TextView tv = new TextView(mContext); 
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
    ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); 
params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE); 
params.leftMargin = 107 
... 
mRelativeLayout.addView(tv, params); 

为RelativeLayout.LayoutParams的文档和构造函数是here

Answer 2

首先，你应该给一个id你RelativeLayout让我们说relativeLayout1。

RelativeLayout mainLayout = (RelativeLayout) findViewById(R.id.relativeLayout1); 
TextView mTextView = new TextView(context); 
mTextView.setText("Dynamic TextView"); 
mTextView.setId(111); 
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); 
params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE); 
params.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE); 
mainLayout.addView(mTextView, params);