<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<!-- -->
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="100dp" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="100dp" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="100dp" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="match_parent" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="100dp" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</com.example.test.MeasTestLayout>
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="100dp" >
<com.example.test.MeasTestLayout
android:layout_width="match_parent"
android:layout_height="50dp" >
</com.example.test.MeasTestLayout>
</FrameLayout>
</FrameLayout>
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
print(widthMeasureSpec, heightMeasureSpec);
}
private void print(int widthMeasureSpec, int heightMeasureSpec){
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
log("begin>>>");
log("width -- mode: "+getMode(widthMode) +" size: "+MeasureSpec.getSize(widthMeasureSpec));
log("height -- mode: "+getMode(heightMode) +" size: "+MeasureSpec.getSize(heightMeasureSpec));
log("<<<");
}
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: AT_MOST size: 1599->1467
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: AT_MOST size: 1599->1467
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: EXACTLY size:
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: EXACTLY size: 1599->1467
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: AT_MOST size: 1599->1467
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: EXACTLY size:
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: EXACTLY size:
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: AT_MOST size:
- ::27.155: D/View(): measure: <<<
- ::27.155: D/View(): measure: begin>>>
- ::27.155: D/View(): measure: width -- mode: EXACTLY size:
- ::27.155: D/View(): measure: height -- mode: EXACTLY size:
- ::27.155: D/View(): measure: <<<
结论:、自定义控件中的onMeasure方法接收的参数的Mode与它的父控件的w、h以及它自身的宽高有关
2、如果自定义控件自身的高度为固定的dp值,传入的参数的mode一定是EXACTLY
3、如果自定义控件自身的高度为wrap_content,传入的参数的mode一定是AT_MOST
4、如果自定义控件自身的高度为match_parent,其父控件的高度为固定dp值,传入的参数的mode一定是EXACTLY
5、如果自定义控件自身的高度为match_parent,其父控件的高度为wrap_content,传入的参数的mode一定是AT_MOST
6、如果自定义控件自身的高度为match_parent,其父控件的高度为match_parent,传入的参数的mode依赖更上层的父控件,并且可能在多次onMeasure中变化
7、MeasureSpec.UNSPECIFIED是未指定尺寸,这种情况不多,一般都是父控件是AdapterView,通过measure方法传入的模式。