本帖最后由 liu 于 2018-12-26 14:56 编辑
ViewStub
ViewStub是一个不可见,size 大小为0的一个View ,用于View的延迟加载,在需要的时候才加载View
注意:ViewStub只能Inflate一次,ViewStub在加载完后会被移除,多次Inflate会报错
用法:
调用setVisibility(View.VISIBLE)或inflate()来加载layout
activity_main.xml:
[XML] 纯文本查看 复制代码 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="Hello World"
android:textSize="20sp" />
<ViewStub
android:id="@+id/vb"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout="@layout/layout_viewstub" />
</RelativeLayout>
layout_viewstub.xml:[XML] 纯文本查看 复制代码 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:src="@drawable/fengjing" />
</LinearLayout> MainActivity:[Java] 纯文本查看 复制代码 package com.company.helloworld.firstapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.ViewStub;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewStub viewStub = (ViewStub) findViewById(R.id.vb);
viewStub.inflate();
}
}
运行结果:
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