大致效果如下
在viewPager中有5個(gè)fragment耗跛，在第二個(gè)fragment中有一個(gè)切換按鈕裕照，可以將自己切換為fragment6，之后點(diǎn)擊fragment6中的按鈕可以切換回來(lái)调塌。晋南。。羔砾。參考:
具體代碼如下
FragmentActivity.class
<pre><code>
package com.lsp.otherandroidtest.fragment_test;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.ViewGroup;
import com.lsp.otherandroidtest.R;
import java.util.ArrayList;
import java.util.List;
/**
-
Created by lsp on 2016/8/5.
*/
public class FragmentViewPagerTest extends AppCompatActivity {
private ViewPager viewPager;
private FragmentPagerAdapter adapter;
private List<Fragment> fragmentList;private TestFragment testFragment1;
private TestFragment testFragment2;
private TestFragment testFragment3;
private TestFragment testFragment4;
private TestFragment testFragment5;private TestFragment testFragment6;
private boolean fragmentsUpdateFlag[] = {false, false, false, false, false};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment_test);initViewPager();}
private void initViewPager() {
viewPager = (ViewPager) findViewById(R.id.id_vp); testFragment1 = TestFragment.getFragment("1"); testFragment2 = TestFragment.getFragment("2"); testFragment3 = TestFragment.getFragment("3"); testFragment4 = TestFragment.getFragment("4"); testFragment5 = TestFragment.getFragment("5"); testFragment6 = TestFragment.getFragment("6"); fragmentList = new ArrayList<>(); fragmentList.add(testFragment1); fragmentList.add(testFragment2); fragmentList.add(testFragment3); fragmentList.add(testFragment4); fragmentList.add(testFragment5); adapter = new MyAdapter(getSupportFragmentManager()); viewPager.setOffscreenPageLimit(5); viewPager.setAdapter(adapter); testFragment2.setTransListener(new TestFragment.onTranslateClick() { @Override public void onClick(String msg) { //點(diǎn)擊切換按鈕 //設(shè)置fragment2的tag為true fragmentsUpdateFlag[1] = true; //替換fragment fragmentList.set(1, testFragment6); adapter.notifyDataSetChanged(); } }); testFragment6.setTransListener(new TestFragment.onTranslateClick() { @Override public void onClick(String msg) { //點(diǎn)擊切換按鈕 //設(shè)置fragment2的tag為true fragmentsUpdateFlag[1] = true; //替換fragment fragmentList.set(1, testFragment6); //刷新 adapter.notifyDataSetChanged(); } });}
public class MyAdapter extends FragmentPagerAdapter {
private FragmentManager fm;
public MyAdapter(FragmentManager fm) {
super(fm);
this.fm = fm;
}
@Override
public Fragment getItem(int position) {
return fragmentList.get(position % fragmentList.size());
}
@Override
public int getCount() {
return fragmentList.size();
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
//得到緩存的fragment
Fragment fragment = (Fragment) super.instantiateItem(container, position);
//得到tag
String fragmentTag = fragment.getTag();
if (fragmentsUpdateFlag[position % fragmentsUpdateFlag.length]) {
//如果這個(gè)fragment需要更新
FragmentTransaction ft = fm.beginTransaction();
//移除舊的fragment
ft.remove(fragment);
//換成新的fragment
fragment = fragmentList.get(position % fragmentList.size());
//添加新fragment時(shí)必須用前面獲得的tag ?
ft.add(container.getId(), fragment, fragmentTag);
ft.attach(fragment);
ft.commit();
//復(fù)位更新標(biāo)志
fragmentsUpdateFlag[position % fragmentsUpdateFlag.length] = false;
}
return fragment;
}
}
}
</code>
</pre>
FragmentActivity.XML
<pre></code>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="@+id/id_vp"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
</code>
</pre>
TestFragment.class
<pre><code>
package com.lsp.otherandroidtest.fragment_test;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.lsp.otherandroidtest.R;
/**
- Created by lsp on 2016/8/5.
*/
public class TestFragment extends Fragment {
private View view;
private String msg;
private onTranslateClick transListener;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_test,null);
msg = getArguments().getString("msg");
((TextView)view.findViewById(R.id.id_tv)).setText(msg);
if("2".equals(msg)||"6".equals(msg))
(view.findViewById(R.id.id_btn)).setVisibility(View.VISIBLE);
(view.findViewById(R.id.id_btn)).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
transListener.onClick(msg);
}
});
return view;
}
public void setTransListener(onTranslateClick listener){
this.transListener = listener;
}
public interface onTranslateClick{
void onClick(String msg);
}
public static TestFragment getFragment(String msg){
TestFragment testFragment= new TestFragment();
Bundle bundle = new Bundle();
bundle.putString("msg",msg);
testFragment.setArguments(bundle);
return testFragment;
}
}
</code>
</pre>
TestFragment.xml
<pre><code>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/id_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textSize="16sp" />
<Button
android:id="@+id/id_btn"
android:visibility="gone"
android:layout_marginTop="10dp"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/id_tv"
android:text="切換" />
</RelativeLayout>
</code>
</pre>
這里用來(lái)表示要替換的Fragment
在TestFragment中為按鈕做了回調(diào)负间，當(dāng)點(diǎn)擊Fragment的按鈕時(shí)，在FragmentActivity中處理蜒茄，
這里是點(diǎn)擊fragment中的回調(diào)處理,
最主要的處理部分在instantiateItem方法中..
