欢迎初学者可以进行学习借鉴,此篇文章主要介绍android底部选项卡用法,希望能够帮助到大家;
1,xml界面,分为新建四个,根据自己项目来,我就建立一个,其它的都一样的,如:fragment1.xml, fragment2.xml,fragment3.xml,fragment4.xml;
2,mainactivity.java主程序,也一样建立四个;
嗯,大概意思都明白了,那么接着就来实际操作吧,首先建立一个xml,我就建一个,其它的就更改TextView的内容可以了,没啥难度的。
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第一个界面"/>
</android.support.constraint.ConstraintLayout>
然后,此时的界面都建立完毕,然后就是firefrangment.java,和上面xml对应,需要几个就建立多少个;
package com.example.rnd.jsonobjcet;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by dm on 16-3-29.
* 第一个页面
*/
public class FirstFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate( R.layout.fragment1, container, false );
return view;
}
}
Fragment界面程序都创建好了,那么就差当前的主程序mainactivity.xml,这个是最关键的,里面包涵图片,文字,标题等。
<?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:background="@color/colorAccent"
android:orientation="vertical">
1. 顶部标题栏
<!--<include-->
<!--android:id="@+id/show_main_title"-->
<!--layout="@layout/title_activity" />-->
<!--2. 存放四个Fragment-->
<FrameLayout
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="@color/whitesmoke">
</FrameLayout>
<!--3. 底部的四个选项菜单-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF">
<!--四个部分都一样:ImageView + TextView-->
<RelativeLayout
android:id="@+id/first_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginTop="8sp"
android:orientation="vertical">
<ImageView
android:id="@+id/first_image"
android:layout_width="20sp"
android:layout_height="20sp"
android:layout_gravity="center_horizontal"
android:src="@android:drawable/ic_menu_compass" />
<TextView
android:id="@+id/first_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textSize="10sp"
android:text="@string/Dash_xx"
android:textColor="#7597B3" />
</LinearLayout>
</RelativeLayout>
<RelativeLayout
android:id="@+id/second_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginTop="8sp"
android:orientation="vertical">
<ImageView
android:id="@+id/second_image"
android:layout_width="20sp"
android:layout_height="20sp"
android:layout_gravity="center_horizontal"
android:src="@android:drawable/ic_menu_agenda" />
<TextView
android:id="@+id/second_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10sp"
android:layout_gravity="center_horizontal"
android:text="@string/Dash_rl"
android:textColor="#7597B3" />
</LinearLayout>
</RelativeLayout>
<RelativeLayout
android:id="@+id/third_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8sp"
android:layout_centerVertical="true"
android:orientation="vertical">
<ImageView
android:id="@+id/third_image"
android:layout_width="20sp"
android:layout_height="20sp"
android:layout_gravity="center_horizontal"
android:src="@android:drawable/ic_menu_edit" />
<TextView
android:id="@+id/third_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10sp"
android:layout_gravity="center_horizontal"
android:text="ddd"
android:textColor="#7597B3" />
</LinearLayout>
</RelativeLayout>
<RelativeLayout
android:id="@+id/fourth_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8sp"
android:layout_centerVertical="true"
android:orientation="vertical">
<ImageView
android:id="@+id/fourth_image"
android:layout_width="20sp"
android:layout_height="20sp"
android:layout_gravity="center_horizontal"
android:src="@android:drawable/ic_menu_myplaces" />
<TextView
android:id="@+id/fourth_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="10sp"
android:layout_gravity="center_horizontal"
android:text="ccccccc"
android:textColor="#7597B3" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
</LinearLayout>
此时最后一步了,mainactivity.java程序,复制粘贴上去可以运行了,哈哈哈,就这么简单的几个步骤,相信不是很难吧,记住FragmentActivity要导入v4的包;
package com.example.rnd.jsonobjcet;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity; // 注意这里我们导入的V4的包,不要导成app的包了
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
/**
* 主页面内容
* Created by dm on 16-1-19.
*/
public class MainActivity extends FragmentActivity implements View.OnClickListener {
// 初始化顶部栏显示
private ImageView titleLeftImv;
private TextView titleTv;
// 定义4个Fragment对象
private FirstFragment fg1;
private SecondFragment fg2;
private ThirdFragment fg3;
private FourthFragment fg4;
// 帧布局对象,用来存放Fragment对象
private FrameLayout frameLayout;
// 定义每个选项中的相关控件
private RelativeLayout firstLayout;
private RelativeLayout secondLayout;
private RelativeLayout thirdLayout;
private RelativeLayout fourthLayout;
private ImageView firstImage;
private ImageView secondImage;
private ImageView thirdImage;
private ImageView fourthImage;
private TextView firstText;
private TextView secondText;
private TextView thirdText;
private TextView fourthText;
// 定义几个颜色
private int whirt = 0xFFFFFFFF;
private int gray = 0xFF7597B3;
private int dark = 0xff000000;
// 定义FragmentManager对象管理器
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getSupportFragmentManager();
initView(); // 初始化界面控件
setChioceItem(0); // 初始化页面加载时显示第一个选项卡
}
/**
* 初始化页面
*/
private void initView() {
// 初始化底部导航栏的控件
firstImage = (ImageView) findViewById(R.id.first_image);
secondImage = (ImageView) findViewById(R.id.second_image);
thirdImage = (ImageView) findViewById(R.id.third_image);
fourthImage = (ImageView) findViewById(R.id.fourth_image);
firstText = (TextView) findViewById(R.id.first_text);
secondText = (TextView) findViewById(R.id.second_text);
thirdText = (TextView) findViewById(R.id.third_text);
fourthText = (TextView) findViewById(R.id.fourth_text);
firstLayout = (RelativeLayout) findViewById(R.id.first_layout);
secondLayout = (RelativeLayout) findViewById(R.id.second_layout);
thirdLayout = (RelativeLayout) findViewById(R.id.third_layout);
fourthLayout = (RelativeLayout) findViewById(R.id.fourth_layout);
firstLayout.setOnClickListener(MainActivity.this);
secondLayout.setOnClickListener(MainActivity.this);
thirdLayout.setOnClickListener(MainActivity.this);
fourthLayout.setOnClickListener(MainActivity.this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.first_layout:
setChioceItem(0);
break;
case R.id.second_layout:
setChioceItem(1);
break;
case R.id.third_layout:
setChioceItem(2);
break;
case R.id.fourth_layout:
setChioceItem(3);
break;
default:
break;
}
}
/**
* 设置点击选项卡的事件处理
*
* @param index 选项卡的标号:0, 1, 2, 3
*/
private void setChioceItem(int index) {
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
clearChioce(); // 清空, 重置选项, 隐藏所有Fragment
hideFragments(fragmentTransaction);
switch (index) {
case 0:
// firstImage.setImageResource(R.drawable.XXXX); 需要的话自行修改
firstText.setTextColor(dark);
firstLayout.setBackgroundColor(gray);
// 如果fg1为空,则创建一个并添加到界面上
if (fg1 == null) {
fg1 = new FirstFragment();
fragmentTransaction.add(R.id.content, fg1);
} else {
// 如果不为空,则直接将它显示出来
fragmentTransaction.show(fg1);
}
break;
case 1:
// secondImage.setImageResource(R.drawable.XXXX);
secondText.setTextColor(dark);
secondLayout.setBackgroundColor(gray);
if (fg2 == null) {
fg2 = new SecondFragment();
fragmentTransaction.add(R.id.content, fg2);
} else {
fragmentTransaction.show(fg2);
}
break;
case 2:
// thirdImage.setImageResource(R.drawable.XXXX);
thirdText.setTextColor(dark);
thirdLayout.setBackgroundColor(gray);
if (fg3 == null) {
fg3 = new ThirdFragment();
fragmentTransaction.add(R.id.content, fg3);
} else {
fragmentTransaction.show(fg3);
}
break;
case 3:
// fourthImage.setImageResource(R.drawable.XXXX);
fourthText.setTextColor(dark);
fourthLayout.setBackgroundColor(gray);
if (fg4 == null) {
fg4 = new FourthFragment();
fragmentTransaction.add(R.id.content, fg4);
} else {
fragmentTransaction.show(fg4);
}
break;
}
fragmentTransaction.commit(); // 提交
}
/**
* 当选中其中一个选项卡时,其他选项卡重置为默认
*/
private void clearChioce() {
// firstImage.setImageResource(R.drawable.XXX);
firstText.setTextColor(gray);
firstLayout.setBackgroundColor(whirt);
// secondImage.setImageResource(R.drawable.XXX);
secondText.setTextColor(gray);
secondLayout.setBackgroundColor(whirt);
// thirdImage.setImageResource(R.drawable.XXX);
thirdText.setTextColor(gray);
thirdLayout.setBackgroundColor(whirt);
// fourthImage.setImageResource(R.drawable.XXX);
fourthText.setTextColor(gray);
fourthLayout.setBackgroundColor(whirt);
}
/**
* 隐藏Fragment
*
* @param fragmentTransaction
*/
private void hideFragments(FragmentTransaction fragmentTransaction) {
if (fg1 != null) {
fragmentTransaction.hide(fg1);
}
if (fg2 != null) {
fragmentTransaction.hide(fg2);
}
if (fg3 != null) {
fragmentTransaction.hide(fg3);
}
if (fg4 != null) {
fragmentTransaction.hide(fg4);
}
}
}
运行的如何?是不是功能很炫酷呢,相信这将对初学者来说还是值得去学习掌握的技能,深刻的去领悟理解,多做就明白啦,好了,不吹牛了,还要继续做项目,谢谢各位的阅读,有什么问题可以向博客说。