所以我试图使用viewpager和fragment pager adapter实现滑动视图/片段。 convert_home是我的主要xml文件，它有android.support.v4.view.PagerTitleStrip和
temperature.xml和velocity.xml是我的另外两个视图。我不知道我哪里出错了。应用程序崩溃（负载）
package app.converto;
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.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class ConverTo extends FragmentActivity {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager.setAdapter(mSectionsPagerAdapter);
setContentView(R.layout.converto_home);
mViewPager = (ViewPager) findViewById(R.id.pager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.converto_home, menu);
return true;
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
switch(i){
case 0:
Fragment1 fragment = new Fragment1();
return fragment;
case 1:
Fragment2 fragment2 = new Fragment2();
return fragment2;
}
defaultFragment fragment3 = new defaultFragment();
return fragment3;
}
@Override
public int getCount() {
return 2;
}
//
// @Override
// public CharSequence getPageTitle(int position) {
// switch (position) {
// case 0: return getString(R.string.velocity);
// case 1: return getString(R.string.temperature);
// case 2: return getString(R.string.distance);
// }
// return null;
// }
}
public static class Fragment1 extends Fragment{
public Fragment1(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//return inflater.inflate(R.layout.temperature, container, false);
View view = inflater.inflate(R.layout.temperature, container, false);
TextView textView = (TextView) view.findViewById(R.id.sample);
textView.setText(getArguments().getString("title"));
return view;
}
}
public static class Fragment2 extends Fragment{
public Fragment2(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//return inflater.inflate(R.layout.velocity, container, false);
View view = inflater.inflate(R.layout.temperature, container, false);
TextView textView = (TextView) view.findViewById(R.id.sample);
textView.setText(getArguments().getString("title"));
return view;
}
}
public static class defaultFragment extends Fragment{
public defaultFragment(){
}//end constructor
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// return inflater.inflate(R.layout.temperature, container, false);
View view = inflater.inflate(R.layout.temperature, container, false);
TextView textView = (TextView) view.findViewById(R.id.sample);
textView.setText(getArguments().getString("title"));
return view;
}//end oncreate
}//end default fragment
}
答案 0 :(得分：1)
嗯一切似乎都没问题，你面临的问题究竟是什么？你能更具体一点吗？
编辑： 哦，我想我知道你的问题是什么我没有第一次看到它。在ConvertTo类中，在初始化之前设置mViewPager的适配器。因此，将OnCreate方法更改为:(如果这是问题，请告诉我）
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
setContentView(R.layout.converto_home);
// Initialize it first otherwise it stays null
mViewPager = (ViewPager) findViewById(R.id.pager);
//Then you set the adapter
mViewPager.setAdapter(mSectionsPagerAdapter);
}
答案 1 :(得分：1)
我不确定这对任何人是否有帮助，但我一直在玩上述示例（作为Android编程的菜鸟）并添加了3个片段部分并重新启用了菜单有6种选择。我还没有测试自己的片段并放置内容，但我希望如果其他人在我所在的地方，它也可能会受益，因为似乎很少有关于工作流程的文档。 SDK示例。这意味着理解体验需要更长的时间。
您需要为菜单名称设置一些蜇声，并且您的布局也已准备就绪。
package uk.co.letscommunicate.manx.central;
// http://stackoverflow.com/questions/12658365/viewpager-and-fragment-pager-adapter-implementation
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.content.Context;
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.FragmentPagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends FragmentActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide fragments for each of the
* sections. We use a {@link android.support.v4.app.FragmentPagerAdapter} derivative, which will
* keep every loaded fragment in memory. If this becomes too memory intensive, it may be best
* to switch to a {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three primary sections
// of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
//unknown may be tab swipe
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
// unknown
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary
* sections of the app.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
switch(i){
case 0:
Fragment1 fragment1 = new Fragment1();
return fragment1;
case 1:
Fragment2 fragment2 = new Fragment2();
return fragment2;
case 2:
Fragment3 fragment3 = new Fragment3();
return fragment3;
case 3:
Fragment4 fragment4 = new Fragment4();
return fragment4;
case 4:
Fragment5 fragment5 = new Fragment5();
return fragment5;
case 5:
Fragment6 fragment6 = new Fragment6();
return fragment6;
}
DefaultFragment DefaultFragment = new DefaultFragment();
return DefaultFragment;
}
@Override
public int getCount() {
return 6;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0: return getString(R.string.title_section1);
case 1: return getString(R.string.title_section2);
case 2: return getString(R.string.title_section3);
case 3: return getString(R.string.title_section4);
case 4: return getString(R.string.title_section5);
case 5: return getString(R.string.title_section6);
}
return null;
}
}
public static class Fragment1 extends Fragment{
public Fragment1(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.detailframent, container, false);
//TextView textView = (TextView) view.findViewById(R.id.pager_title_strip);
//textView.setText(getArguments().getString("title"));
return view;
}
}
public static class Fragment2 extends Fragment{
public Fragment2(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.detailframent, container, false);
//TextView textView = (TextView) view.findViewById(R.id.pager_title_strip);
//textView.setText(getArguments().getString("title"));
return view;
}
}
public static class Fragment3 extends Fragment{
public Fragment3(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.detailframent, container, false);
//TextView textView = (TextView) view.findViewById(R.id.pager_title_strip);
//textView.setText(getArguments().getString("title"));
return view;
}
}
public static class Fragment4 extends Fragment{
public Fragment4(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.detailframent, container, false);
//TextView textView = (TextView) view.findViewById(R.id.pager_title_strip);
//textView.setText(getArguments().getString("title"));
return view;
}
}
public static class Fragment5 extends Fragment{
public Fragment5(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.detailframent, container, false);
//TextView textView = (TextView) view.findViewById(R.id.pager_title_strip);
//textView.setText(getArguments().getString("title"));
return view;
}
}
public static class Fragment6 extends Fragment{
public Fragment6(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.detailframent, container, false);
//TextView textView = (TextView) view.findViewById(R.id.pager_title_strip);
//textView.setText(getArguments().getString("title"));
return view;
}
}
public static class DefaultFragment extends Fragment{
public DefaultFragment(){
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.detailframent, container, false);
//TextView textView = (TextView) view.findViewById(R.id.pager_title_strip);
//textView.setText(getArguments().getString("title"));
return view;
}
//end on create
}//end default fragment
}
答案 2 :(得分：0)
textview导致应用程序崩溃。我没有正确宣布它。
答案 3 :(得分：0)
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager = (ViewPager) findViewById(R.id.pager);
交换上面的两行，看起来像是：
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);