1、public static class

ViewGroup.LayoutParams

extends Object

java.lang.Object
????	android.view.ViewGroup.LayoutParams

Class Overview

LayoutParams are used by views to tell their parents how they want to be laid out.

LayoutParams是ViewGroup的一個內部類, 每個不同的ViewGroup都有自己的LayoutParams子類

DEMO:

//創建一個線性布局 private LinearLayout mLayout; mLayout = (LinearLayout) findViewById(R.id.layout); //現在要往mLayout里邊添加一個TextView TextView textView = new TextView(Activity01.this); textView.setText("Text View " ); //這里是設置 這個textView的布局 FILL_PARENT WRAP_CONTENT 和在xml文件里邊設置是一樣的如 /**<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Text View"/>*///第一個參數為寬的設置，第二個參數為高的設置。 LinearLayout.LayoutParams p = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT ); //調用addView()方法增加一個TextView到線性布局中 mLayout.addView(textView, p); //比較簡單的一個例子

LayoutParams繼承于Android.View.ViewGroup.LayoutParams.
LayoutParams相當于一個Layout的信息包，它封裝了Layout的位置、高、寬等信息。假設在屏幕上一塊區域是由一個Layout占領的，如果將一個View添加到一個Layout中，最好告訴Layout用戶期望的布局方式，也就是將一個認可的layoutParams傳遞進去。
可以這樣去形容LayoutParams，在象棋的棋盤上，每個棋子都占據一個位置，也就是每個棋子都有一個位置的信息，如這個棋子在4行4列，這里的“4行4列”就是棋子的LayoutParams。

但LayoutParams類也只是簡單的描述了寬高，寬和高都可以設置成三種值：
1，一個確定的值；
2，FILL_PARENT
3，WRAP_CONTENT

2、addRule()

public class

RelativeLayout

extends ViewGroup

java.lang.Object
????	android.view.View
?	????	android.view.ViewGroup
?	?	????	android.widget.RelativeLayout

java.lang.Object
????	android.view.View
?	????	android.view.ViewGroup
?	?	????	android.widget.RelativeLayout

void android.widget.RelativeLayout.LayoutParams.addRule(int verb,?int anchor)

public void addRule (int verb, int anchor) 設置控件的相對位置

Added in API level 1

Adds a layout rule to be interpreted by the RelativeLayout. Use this for verbs that take a target, such as a sibling (ALIGN_RIGHT) or a boolean value (VISIBLE).

Parameters

verbanchor

One of the verbs defined by RelativeLayout, such as ALIGN_WITH_PARENT_LEFT.

The id of another view to use as an anchor, or a boolean value(represented as TRUE) for true or 0 for false). For verbs that don't refer to another sibling (for example, ALIGN_WITH_PARENT_BOTTOM) just use -1.

package sunny.example.layoutparamstaddrule;import android.content.Context; import android.util.AttributeSet; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.RelativeLayout.LayoutParams; import android.widget.TextView;public class TestView extends RelativeLayout{private LayoutParams mLayoutParams_1,mLayoutParams_2;Button mButton;TextView mTextView;public TestView(Context context) {super(context);// TODO Auto-generated constructor stubmButton = new Button(context);mTextView = new TextView(context);init();}public TestView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubmButton = new Button(context);mTextView = new TextView(context);init();}public TestView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stubmButton = new Button(context);mTextView = new TextView(context);init();}public void init(){mLayoutParams_1 = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);mLayoutParams_1.addRule(RelativeLayout.ALIGN_TOP); addView(mButton,mLayoutParams_1);mLayoutParams_2 = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);mLayoutParams_2.addRule(RelativeLayout.BELOW, TRUE);mTextView.setText("Hey");addView(mTextView,mLayoutParams_2);} }

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