報出異常的原因是由于少添加了構造方法，三個構造方法需要寫完整，不能只寫一個。參數為(Context, AttributeSet)，其中第二個參數用來將xml文件中的屬性初始化。

自定義控件若需要在xml文件中使用，就必須重寫帶如上兩個參數的構造方法。

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);} } 自定義控件在XML文件中使用

<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="sunny.example.layoutparamstaddrule.MainActivity" ><sunny.example.layoutparamstaddrule.TestViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"></sunny.example.layoutparamstaddrule.TestView></RelativeLayout>

LayoutPrams

RelativeLayout.LayoutParams

extends ViewGroup.MarginLayoutParams

java.lang.Object
????	android.view.ViewGroup.LayoutParams
?	????	android.view.ViewGroup.MarginLayoutParams
?	?	????	android.widget.RelativeLayout.LayoutParams

Public Constructors

	RelativeLayout.LayoutParams(Context c, AttributeSet attrs)
	RelativeLayout.LayoutParams(int w, int h)
	RelativeLayout.LayoutParams(ViewGroup.LayoutParams source)
	RelativeLayout.LayoutParams(ViewGroup.MarginLayoutParams source)
	RelativeLayout.LayoutParams(RelativeLayout.LayoutParams source)Copy constructor.

RelativeLayout.LayoutParams的方法：

public void addRule (int verb)

Adds a layout rule to be interpreted by the RelativeLayout. This method should only be used for constraints that don't refer to another sibling (e.g., CENTER_IN_PARENT) or take a boolean value (TRUE for true or 0 for false). To specify a verb that takes a subject, use addRule(int, int) instead.

Parameters

verb

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

public void addRule (int verb, int anchor)

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

RelativeLayout.LayoutParams.addRule() 方法，該方法有兩種重載方式：

addRule(int verb) ：用此方法時，所設置節點的屬性不能與其它兄弟節點相關聯或者屬性值為布爾值（布爾值的屬性，設置時表示該屬性為 true，不設置就默認為 false），比如：addRule(RelativeLayout.CENTER_VERTICAL) 就表示在 RelativeLayout 中的相應節點是垂直居中的。

addRule(int verb, int anchor) ：該方法所設置節點的屬性必須關聯其它的兄弟節點或者屬性為布爾值（ 屬性為布爾值時，anchor 為 RelativeLayout.TRUE 表示 true，anchor 為0表示 false），比如：addRule(RelativeLayout.ALIGN_LEFT, R.id.date) 就表示 RelativeLayout 中的相應節點放置在一個 id 值為 date 的兄弟節點的左邊。

總結

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