Fragment+RadioButton實現點選切換頁面效果
阿新 • • 發佈：2018-11-30
首先，我們需要在主佈局檔案中activity_main.xml 放一個 容器，方便讓fragment加入進去,底部導航欄使用RedioButton切換頁面，每一個RadioButton都使用了選擇器進行圖片與字型的變化。
（下一篇+viewPage滑動）
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.test.activity.MainActivity"
android:weightSum="9">
<FrameLayout
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="7.5">
</FrameLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1.5"
android:gravity="center"
android:orientation="horizontal">
<RadioGroup
android:id="@+id/radioGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal">
<RadioButton
android:id="@+id/rbHome"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_gravity="right"
android:layout_weight="1"
android:button="@null"
android:checked="true"
android:drawableTop="@drawable/rabtn_a_selector"
android:textColor="@drawable/rabtn_a_selector"
android:gravity="center"
android:text="我的"/>
<RadioButton
android:id="@+id/rbShop"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:button="@null"
android:checked="false"
android:drawableTop="@drawable/rabtn_b_selector"
android:textColor="@drawable/rabtn_b_selector"
android:gravity="center"
android:text="發現"/>
<RadioButton
android:checked="false"
android:id="@+id/rbMessage"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:button="@null"
android:drawableTop="@drawable/rabtn_c_selector"
android:textColor="@drawable/rabtn_c_selector"
android:gravity="center"
android:text="通訊"/>
<RadioButton
android:checked="false"
android:id="@+id/rbMine"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_weight="1"
android:button="@null"
android:drawableTop="@drawable/rabtn_d_selector"
android:textColor="@drawable/rabtn_d_selector"
android:gravity="center"
android:text="訊息"/>
</RadioGroup>
</LinearLayout>
</LinearLayout> 四個相同選擇器檔案rabtn_a_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/c_0" android:state_checked="false" android:color="@color/gray"/>
<item android:drawable="@drawable/c_1" android:state_checked="true" android:color="@color/bule"/>
</selector>
然後，在對應的MainActivity.java檔案中實現點選切換（fragment的替換或隱藏二種方法如下）
package com.test.activity;
import com.test.fragment.FragmentA;
import com.test.fragment.FragmentB;
import com.test.fragment.FragmentC;
import com.test.fragment.FragmentD;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class MainActivity extends FragmentActivity {
private FragmentA f_a;
private FragmentB f_b;
private FragmentC f_c;
private FragmentD f_d;
private Fragment[] mFragments;
private int mIndex;
private RadioGroup radioGroup;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initFragment();//方法一，預設第一fragment
//changeFragment(new FragmentA().getFragmentA());//方法二，預設第一fragment
}
private void initView() {
radioGroup = (RadioGroup)findViewById(R.id.radioGroup);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int arg1) {
//遍歷RadioGroup 裡面所有的子控制元件。
for (int index = 0; index < group.getChildCount(); index++) {
//獲取到指定位置的RadioButton
RadioButton rb = (RadioButton)group.getChildAt(index);
//如果被選中
if (rb.isChecked()) {
setIndexSelected(index);
//setIndexSelectedTwo(index); //方法二
break;
}
}
}
});
}
//方法一，預設第一fragment
private void initFragment() {
f_a =new FragmentA();
f_b =new FragmentB();
f_c =new FragmentC();
f_d =new FragmentD();
//新增到陣列
mFragments = new Fragment[]{f_a,f_b,f_c,f_d};
//開啟事務
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction ft= fragmentManager.beginTransaction();
//新增首頁
ft.add(R.id.content,f_a).commit();
//預設設定為第0個
setIndexSelected(0);
}
//方法一，選中顯示與隱藏
private void setIndexSelected(int index) {
if(mIndex==index){
return;
}
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction ft= fragmentManager.beginTransaction();
//隱藏
ft.hide(mFragments[mIndex]);
//判斷是否新增
if(!mFragments[index].isAdded()){
ft.add(R.id.content,mFragments[index]).show(mFragments[index]);
}else {
ft.show(mFragments[index]);
}
ft.commit();
//再次賦值
mIndex=index;
}
//方法二，選中替換
private void setIndexSelectedTwo(int index) {
switch (index) {
case 0:
changeFragment(new FragmentA().getFragmentA());
break;
case 1:
changeFragment(new FragmentB().getFragmentB());
break;
case 2:
changeFragment(new FragmentC().getFragmentC());
break;
case 3:
changeFragment(new FragmentD().getFragmentD());
break;
default:
break;
}
}
////方法二，預設第一fragment
private void changeFragment(Fragment fm) {
FragmentManager supportFragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = supportFragmentManager.beginTransaction();
transaction.replace(R.id.content, fm);
transaction.commit();
}
}
四個相同的Fragment檔案，對應的xml就放了一個文字就不貼出來了
package com.test.fragment;
import com.test.activity.R;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentA extends Fragment{
private View view;
// 單例(方法二)
private static FragmentA fa;
public static FragmentA getFragmentA() {
if (fa == null) {
fa = new FragmentA();
}
return fa;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
view= inflater.inflate(R.layout.fragment_a, container, false);
return view;
}
}
