【include+LinearLayout】的使用例子

AndroidIncludeLayout.java

package com.AndroidIncludeLayout; 

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast; 

public class AndroidIncludeLayout extends Activity { 

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main); 

        View subLayout1 = (View)findViewById(R.id.main1);

        View subLayout2 = (View)findViewById(R.id.main2);

        Button myButton_main1 = (Button)subLayout1.findViewById(R.id.mybutton);

        Button myButton_main2 = (Button)subLayout2.findViewById(R.id.mybutton);

        Button startAnotherActivity = (Button)findViewById(R.id.startanotheractivity); 

        startAnotherActivity.setOnClickListener(new Button.OnClickListener(){ 

   @Override

   public void onClick(View arg0) {

    // TODO Auto-generated method stub

    Intent intent = new Intent();

             intent.setClass(AndroidIncludeLayout.this, AnotherActivity.class);

             startActivity(intent); 

   }}); 

        myButton_main1.setOnClickListener(new Button.OnClickListener(){ 

   @Override

   public void onClick(View arg0) {

    // TODO Auto-generated method stub

    Toast.makeText(AndroidIncludeLayout.this, "Button 1 Pressed", Toast.LENGTH_LONG).show();

   }}); 

        myButton_main2.setOnClickListener(new Button.OnClickListener(){ 

   @Override

   public void onClick(View arg0) {

    // TODO Auto-generated method stub

    Toast.makeText(AndroidIncludeLayout.this, "Button 2 Pressed", Toast.LENGTH_LONG).show();

   }});

    }

}

mail.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    >

<TextView

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text="@string/hello"

    />

<include android:id="@+id/main1" layout="@layout/sublayout" />

<include android:id="@+id/main2" layout="@layout/sublayout" />

<Button

    android:id="@+id/startanotheractivity"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:text=" Start Another Activity "

    />

</LinearLayout>

sublayout.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:background="#505050"

    >

<TextView

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text="SubLayout"

    />

<Button

android:id="@+id/mybutton"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:text=" A Button "

    />

</LinearLayout>

【include+merge】 //与上面的include用法有点不一样

LightActivity.java

/**

 * Copyright(c) 2014-2015 ChinaYong Hotel Media Technology Co.,Ltd.

 * All Rights Reserved.

 *

 * Filename : LightActivity.java

 * Author : Seldy lipeineng

 * Creation time : 上午10:58:53 - 2015-6-4

 * Description :

 */

package com.hysmarthotel.roomcontrol;

import com.hysmarthotel.util.LogUtil;

import com.hysmarthotel.view.Temperature;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.TextView;

//灯光控制

public class LightActivity extends Activity {

    public static Temperature temp;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.light);

        temp = (Temperature)findViewById(R.id.temperature_light);  //特殊的地方是，可以直接一步调用merge中的id，不用通过include，再去调用

        log("layout1"+temp);

        init();

    }

    private void init() {

        temp.setTemperature(MainActivity.mTemp+"");

    }

    private void log(String msg) {

        LogUtil.info(this.getClass(), this + ":" + msg,"i");

    }

}

light.xml

<?xml version="1.0" encoding="utf-8"?>

<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="@drawable/bg1" >

    <TextView

        android:id="@+id/lightctrl"

        android:layout_x="91.5px"

        android:layout_y="93.0px"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:gravity="center_vertical"

        android:textSize="42.0px"

        android:textColor="#fff3e3d1"

        android:text="@string/light_ctrl"

        android:drawableLeft="@drawable/ic_light_t"

        android:drawablePadding="6px"/>

    <include android:id="@+id/include1" layout="@layout/time_temp"/>

</AbsoluteLayout>

time_temp.xml

<?xml version="1.0" encoding="utf-8"?>

<merge xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:hyhotel="http://schemas.android.com/apk/res/com.hysmarthotel.roomcontrol" >

<com.hysmarthotel.view.Temperature

android:id="@+id/temperature_light"

android:layout_x="1545.0px"

android:layout_y="109.5px"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="22.5px"

android:textColor="#fff3e3d1"

hyhotel:prefix="@string/room_temp"

hyhotel:unit="@string/celsius" />

</merge>

Android 布局优化 include+merge+ViewStub标签详解

merge标签

merge用于消除视图层次结构中的冗余视图,例如根布局是Linearlayout,那么我们又include一个LinerLayout布局就没意义了,反而会减慢UI加载速度。

又或者根布局是FrameLayout且不需要设置background或padding等属性,可以用merge代替,因为Activity的ContentView父元素就是FrameLayout,所以可以用merge消除只剩一个

ViewStub标签

ViewStub 标签最大的优点是当你需要时才会加载，使用他并不会影响UI初始化时的性能。各种不常用的布局比如进度条、显示错误消息等可以使用<ViewStub />标签，以减少内存使用量，加快渲染速度。

由于ViewStub第一次inflate的时候，就已经将需要显示的布局替换掉自己了，所以第二次inflate的时候，getParent()是null，所以就会报异常。解决方法是inflate()的时候将view保存起来，然后下次判断这个View是否为NUll,如果是null就inflate().否则就直接使用这个view。

巴特西

include的用法例子，以及include+merge的用法例子

Android 布局优化 include+merge+ViewStub标签详解

merge标签

ViewStub标签

最新文章

热门文章