如图：
那么到这里我们的界面布局就基本完成了！
相应Fragment的实现类
接下来我们需要写四个相应的Fragment的实现类，同样拷贝4份，改用inflate加载Fragment即可。即，包含四个差不多一样的Fragment,分别起名为：FirstFragment.java、SecondFragment.java、ThirdFragment.java、FourthFragment.java。下面主要展示一下FirstFragment.java的具体代码：
package com.example.dm.myapplication;
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.fg1, container, false);
return view;
}
}
如图：
最重要的MainActivity
各个七零八落的小部件都已经准备到序了，现在只剩下这个主界面实现类把他们融合在一起，实现相应的效果了。
MainActivity.java 的编写也很简单，直接看代码和注释就可以了，不多解释额：主要包含几个初始化方法、选中处理、隐藏所有Fragment的方法。详见MainActivity.java：
package com.example.dm.myapplication;
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.show_main_lay);
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() {
// 初始化页面标题栏
titleLeftImv = (ImageView) findViewById(R.id.title_imv);
titleLeftImv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, LoginActivity.class));
}
});
titleTv = (TextView) findViewById(R.id.title_text_tv);
titleTv.setText("首 页");
// 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);
}
}
}
