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[英]Android: FragmentPagerAdapter not working with ViewPager and material TabLayout
[英]Swipe not Working in android ViewPager using FragmentPagerAdapter
我想為此創建一個滑動應用程序,我在Android中使用ViewPager
。 當我運行下面的代碼時,它會成功運行並打開一個藍色的Fragment
,但滑動不起作用。 你能告訴我為什么嗎?
這是我的Activity
:
package app.learn.com.learnapp;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import java.util.List;
import java.util.Vector;
import menulistFrag.blueColor;
import menulistFrag.greenColor;
import menulistFrag.redColor;
public class MenuActivityList1 extends FragmentActivity {
ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu_activity_list1);
viewPager = (ViewPager)findViewById(R.id.pager);
instantiateFrags();
}
public void instantiateFrags(){
List<Fragment> frags = new Vector<Fragment>();
frags.add(Fragment.instantiate(this, redColor.class.getName()));
frags.add(Fragment.instantiate(this, greenColor.class.getName()));
frags.add(Fragment.instantiate(this, blueColor.class.getName()));
PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager(),frags);
viewPager.setAdapter(pagerAdapter);
viewPager.setCurrentItem(0);
}
}
這是我的PagerAdapter
:
package app.learn.com.learnapp;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import java.util.List;
import menulistFrag.blueColor;
import menulistFrag.greenColor;
import menulistFrag.redColor;
/**
* Created by root on 13/9/15.
*/
public class PagerAdapter extends FragmentPagerAdapter {
List<Fragment> fragments;
public PagerAdapter(FragmentManager fm,List<Fragment> fragLists){
super(fm);
fragments =fragLists;
}
@Override
public Fragment getItem(int position) {
return fragments.get(position);
}
@Override
public int getCount() {
return 3;
}
}
我有三個片段:
redColor.java
greenColor.java
blueColor.java
這是我的布局文件:
<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">
<android.support.v4.view.ViewPager 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:id="@+id/pager">
</android.support.v4.view.ViewPager>
</LinearLayout>
你的instantiateFrags函數有點奇怪 - 通常你應該在PagerAdapter中聲明片段,然后使用activity的onCreate方法實例化PagerAdapter本身。 您的PagerAdapter代碼可能如下所示:
public class PagerAdapter extends FragmentPagerAdapter {
int mNumOfTabs;
public PagerAdapter(FragmentManager fm, int NumOfTabs){
super(fm);
this.mNumOfTabs = NumOfTabs;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
blueColor tab1 = new blueColor();
return tab1;
case 1:
greenColor tab2 = new greenColor();
return tab2;
case 2:
redColor tab3 = new redColor();
return tab3;
default:
return null;
}
}
@Override
public int getCount() {
return mNumOfTabs;
}
}
然后在主活動的onCreate方法中初始化PagerAdapter(我在這里使用過TabLayout):
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Blue"));
tabLayout.addTab(tabLayout.newTab().setText("Green"));
tabLayout.addTab(tabLayout.newTab().setText("Red"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
PagerAdapter adapter = new PagerAdapter(
getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(
new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
選項卡布局和尋呼機的xml:
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:layout_alignParentTop="true"
android:theme="@style/YOUR_THEME_HERE"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout"/>
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