android主界面(fragment)

优点：main.java中只有为数不多的布局代码，便于省察和更新；除main.java外，每一个class对应着一个layout，大大增加了代码的可读性。作为android 3.0新推出的fragment，建议使用

缺点：缺少了viewPager的灵活性

main.xml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:orientation="vertical" >

<include layout="@layout/top" />

<FrameLayout
android:id="@+id/id_content"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
></FrameLayout>

<include layout="@layout/bottom" />

</LinearLayout>

main.xml效果图：



top.xml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="45dp"
android:background="@drawable/title_bar"
android:orientation="vertical"
android:gravity="center" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="微信"
android:textSize="20sp"
android:textColor="#ffffff"
android:textStyle="bold"
android:layout_gravity="center" />

</LinearLayout>

top.xml效果图：



bottom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="55dp"
android:background="@drawable/bottom_bar"
android:orientation="horizontal" >

<LinearLayout
android:id="@+id/id_tab_weixin"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >

<ImageButton
android:id="@+id/id_tab_weixin_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_weixin_pressed" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="微信"
android:textColor="#ffffff" />
</LinearLayout>
<LinearLayout
android:id="@+id/id_tab_frd"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >

<ImageButton
android:id="@+id/id_tab_frd_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_find_frd_normal" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="朋友"
android:textColor="#ffffff" />
</LinearLayout>

<LinearLayout
android:id="@+id/id_tab_address"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >

<ImageButton
android:id="@+id/id_tab_address_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_address_normal" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="通讯录"
android:textColor="#ffffff" />
</LinearLayout>

<LinearLayout
android:id="@+id/id_tab_settings"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >

<ImageButton
android:id="@+id/id_tab_settings_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="false"
android:src="@drawable/tab_settings_normal" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="设置"
android:textColor="#ffffff" />
</LinearLayout>

</LinearLayout>

bottom.xml效果图：



tab01.xml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:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="this is weixin tab"
android:textSize="30sp"
android:textStyle="bold" />

</LinearLayout>

activity.java代码：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.LinearLayout;

/**
* 不知道为何继承的包（android.support.v4.app.FragmentActivity）不能导入,不过这样也能用
*
* @author yi
*
*/
public class FragmentActivity extends android.support.v4.app.FragmentActivity implements OnClickListener {

private LinearLayout mTabWeixin;
private LinearLayout mTabFrd;
private LinearLayout mTabAddress;
private LinearLayout mTabSettings;

private ImageButton mImgWeixin;
private ImageButton mImgFrd;
private ImageButton mImgAddress;
private ImageButton mImgSettings;

private Fragment mTab01;
private Fragment mTab02;
private Fragment mTab03;
private Fragment mTab04;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);

initView();
initEvent();
setSelect(0);
}

private void initEvent() {
mTabWeixin.setOnClickListener(this);
mTabFrd.setOnClickListener(this);
mTabAddress.setOnClickListener(this);
mTabSettings.setOnClickListener(this);
}

private void initView() {
mTabWeixin = (LinearLayout) findViewById(R.id.id_tab_weixin);
mTabFrd = (LinearLayout) findViewById(R.id.id_tab_frd);
mTabAddress = (LinearLayout) findViewById(R.id.id_tab_address);
mTabSettings = (LinearLayout) findViewById(R.id.id_tab_settings);

mImgWeixin = (ImageButton) findViewById(R.id.id_tab_weixin_img);
mImgFrd = (ImageButton) findViewById(R.id.id_tab_frd_img);
mImgAddress = (ImageButton) findViewById(R.id.id_tab_address_img);
mImgSettings = (ImageButton) findViewById(R.id.id_tab_settings_img);

}

private void setSelect(int i) {
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransactio
c273
n();
hideFragment(transaction);
// 选择后图片变亮
// 切换选择区域
switch (i) {
case 0:
if (mTab01 == null) {
mTab01 = new WeixinFragment();
} else {
transaction.show(mTab01);
}
mImgWeixin.setImageResource(R.drawable.tab_weixin_pressed);
break;
case 1:
if (mTab02 == null) {
mTab02 = new FrdFragment();
} else {
transaction.show(mTab02);
}
mImgFrd.setImageResource(R.drawable.tab_find_frd_pressed);
break;
case 2:
if (mTab03 == null) {
mTab03 = new AddressFragment();
} else {
transaction.show(mTab03);
}
mImgAddress.setImageResource(R.drawable.tab_address_pressed);
break;
case 3:
if (mTab04 == null) {
mTab04 = new SettingFragment();
} else {
transaction.show(mTab04);
}
mImgSettings.setImageResource(R.drawable.tab_settings_pressed);
break;
default:
break;
}
transaction.commit();
}

private void hideFragment(FragmentTransaction transaction) {
if (mTab01 != null) {
transaction.hide(mTab01);
transaction.add(R.id.id_content, mTab01);
}
if (mTab02 != null) {
transaction.hide(mTab02);
transaction.add(R.id.id_content, mTab02);
}
if (mTab03 != null) {
transaction.hide(mTab03);
transaction.add(R.id.id_content, mTab03);
}
if (mTab04 != null) {
transaction.hide(mTab04);
transaction.add(R.id.id_content, mTab04);
}
}

public void onClick(View v) {
resetImgs();
switch (v.getId()) {

case R.id.id_tab_weixin:
setSelect(0);
break;
case R.id.id_tab_frd:
setSelect(1);
break;
case R.id.id_tab_address:
setSelect(2);
break;
case R.id.id_tab_settings:
setSelect(3);
break;
default:
break;
}
}

/**
* 切换图片为暗色
*/
private void resetImgs() {
mImgWeixin.setImageResource(R.drawable.tab_weixin_normal);
mImgFrd.setImageResource(R.drawable.tab_find_frd_normal);
mImgAddress.setImageResource(R.drawable.tab_address_normal);
mImgSettings.setImageResource(R.drawable.tab_settings_normal);
}
}

注意：有关的fragment要统一引入support.v4 的包，不能混淆使用，否则会报错，而且不容易检查出来，在引入的时候要仔细看

weixinFragment.java代码：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class WeixinFragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.tab01, container, false);
}

}