使用 android 中的片段从选项卡获取数据
getting data from tabs using fragment in android
我正在开发一个 android 应用程序，它有一个选项卡 activity.in 这个 activity 还有四个选项卡是使用 Fragments.now 创建的 我想得到来自主选项卡中片段选项卡的数据 activity.i 搜索了很多但没有找到确切的 answer.if 任何可以解决这个问题的方法。下面是我的代码
主选项卡Activity
public class TabedActivity extends ActionBarActivity {
// Declaring Your View and Variables
MobileServiceClient MSC;
MobileServiceTable MST;
Toolbar toolbar;
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[]={"Basic","Education","Profession","Experiance"};
int Numboftabs =4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabed);
// Creating The Toolbar and setting it as the Toolbar for the activity
// toolbar = (Toolbar) findViewById(R.id.tool_bar);
//setSupportActionBar(toolbar);
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
@Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_tabed, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
item.getItemId();
switch (item.getItemId()) {
case R.id.action_settings:
goToHome();
return true;
case R.id.done:
Toast.makeText(this, "you select done", Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
//noinspection SimplifiableIfStatement
}
public void goToHome(){
Intent gotohome=new Intent(this,MapsActivity.class);
startActivity(gotohome);
}
//the following function was added to update but not working
public static void settingValues(){
和选项卡 activity
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.EditText;
import android.widget.Toast;
/**
* Created by hp1 on 21-01-2015.
*/
public class Tab1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1,container,false);
EditText contactNumber= (EditText)v.findViewById(R.id.editTextcontact);
EditText address= (EditText)v.findViewById(R.id.editText2);
contactNumber.setHint("Your ContactNo Plz");
address.setHint("Your address Plz");
return v;
}
}
查看页面适配器class
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
CharSequence Titles[]; // This will Store the Titles of the Tabs which are Going to be passed when ViewPagerAdapter is created
int NumbOfTabs; // Store the number of tabs, this will also be passed when the ViewPagerAdapter is created
// Build a Constructor and assign the passed Values to appropriate values in the class
public ViewPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) {
super(fm);
this.Titles = mTitles;
this.NumbOfTabs = mNumbOfTabsumb;
}
//This method return the fragment for the every position in the View Pager
@Override
public Fragment getItem(int position) {
if(position == 0) // if the position is 0 we are returning the First tab
{
Tab1 tab1 = new Tab1();
return tab1;
}
else if (position==1){
Tab2 tab2 = new Tab2();
return tab2;
}
else if (position==2){
Tab3 tab3 = new Tab3();
return tab3;
}
else // As we are having 2 tabs if the position is now 0 it must be 1 so we are returning second tab
{
Tab4 tab4=new Tab4();
return tab4;
}
}
// This method return the titles for the Tabs in the Tab Strip
@Override
public CharSequence getPageTitle(int position) {
return Titles[position];
}
// This method return the Number of tabs for the tabs Strip
@Override
public int getCount() {
return NumbOfTabs;
}
}
这只不过是 nested fragment 片段内的片段（嵌套）基本上是 not supported。你也这样做，Nested fragments are not currently supported。尝试将一个片段放在另一个片段的 UI 内将导致应用程序出现未定义且可能损坏的行为..
编辑
为了引用您的观点，您应该在 class 级别声明 view(s)，例如
public class Tab1 extends Fragment {
EditTex address,contactNumber;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1,container,false);
contactNumber= (EditText)v.findViewById(R.id.editTextcontact);
address= (EditText)v.findViewById(R.id.editText2);
contactNumber.setHint("Your ContactNo Plz");
address.setHint("Your address Plz");
return v;
}
public String getData(){
return address.getText().toString();
}
}
首先声明一个全局变量来维护对正在显示的currentPage的引用
int currentPage = 0; // 0 - 因为最初显示第 0 页。
您可以使用以下方法获取对您的 Fragment 的引用：
private static String makeFragmentName(int viewPagerId, int index) {
return "android:switcher:" + viewPagerId + ":" + index;
}
上面的viewPagerId就是你的ViewPager'sid
您需要在 ViewPager 上为这个 implement addOnPageChangeListener() 显示的 current page 保留一个参考，并在 onPageSelected() 方法中更新您的 currentPage 变量.
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
currentPage = position;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
现在为了在 onOptionsItemSelected() 方法中获取数据，您可以像下面那样做
// You will need to check for the index manually and get the reference of the current `Fragment` so a solution to this can be like
if(currentPage == 0){
Tab1 tab1 = (Tab1)getSupportFragmentManager().findFragmentByTag(makeFragmentName(R.id.your_view_pager,currentPage));
// always check for null
if(tab1 != null){
String data = tab1.getData();
}
}else if(currentPage == 1){
Tab2 tab2 = (Tab2)getSupportFragmentManager().findFragmentByTag(makeFragmentName(R.id.your_view_pager,currentPage));
if(tab2 != null){
String data = tab2.getData();
}
}
... so on
在您的片段中创建方法来访问数据，例如
public String getData(){
String data = yourEditText.getText().toString();
return data;
}
同样，您也可以访问其他数据，如果您需要更多详细信息，请告诉我
我正在开发一个 android 应用程序，它有一个选项卡 activity.in 这个 activity 还有四个选项卡是使用 Fragments.now 创建的 我想得到来自主选项卡中片段选项卡的数据 activity.i 搜索了很多但没有找到确切的 answer.if 任何可以解决这个问题的方法。下面是我的代码
主选项卡Activity
public class TabedActivity extends ActionBarActivity {
// Declaring Your View and Variables
MobileServiceClient MSC;
MobileServiceTable MST;
Toolbar toolbar;
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[]={"Basic","Education","Profession","Experiance"};
int Numboftabs =4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabed);
// Creating The Toolbar and setting it as the Toolbar for the activity
// toolbar = (Toolbar) findViewById(R.id.tool_bar);
//setSupportActionBar(toolbar);
// Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs.
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
@Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_tabed, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
item.getItemId();
switch (item.getItemId()) {
case R.id.action_settings:
goToHome();
return true;
case R.id.done:
Toast.makeText(this, "you select done", Toast.LENGTH_SHORT).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
//noinspection SimplifiableIfStatement
}
public void goToHome(){
Intent gotohome=new Intent(this,MapsActivity.class);
startActivity(gotohome);
}
//the following function was added to update but not working
public static void settingValues(){
和选项卡 activity
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.EditText;
import android.widget.Toast;
/**
* Created by hp1 on 21-01-2015.
*/
public class Tab1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1,container,false);
EditText contactNumber= (EditText)v.findViewById(R.id.editTextcontact);
EditText address= (EditText)v.findViewById(R.id.editText2);
contactNumber.setHint("Your ContactNo Plz");
address.setHint("Your address Plz");
return v;
}
}
查看页面适配器class
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
CharSequence Titles[]; // This will Store the Titles of the Tabs which are Going to be passed when ViewPagerAdapter is created
int NumbOfTabs; // Store the number of tabs, this will also be passed when the ViewPagerAdapter is created
// Build a Constructor and assign the passed Values to appropriate values in the class
public ViewPagerAdapter(FragmentManager fm,CharSequence mTitles[], int mNumbOfTabsumb) {
super(fm);
this.Titles = mTitles;
this.NumbOfTabs = mNumbOfTabsumb;
}
//This method return the fragment for the every position in the View Pager
@Override
public Fragment getItem(int position) {
if(position == 0) // if the position is 0 we are returning the First tab
{
Tab1 tab1 = new Tab1();
return tab1;
}
else if (position==1){
Tab2 tab2 = new Tab2();
return tab2;
}
else if (position==2){
Tab3 tab3 = new Tab3();
return tab3;
}
else // As we are having 2 tabs if the position is now 0 it must be 1 so we are returning second tab
{
Tab4 tab4=new Tab4();
return tab4;
}
}
// This method return the titles for the Tabs in the Tab Strip
@Override
public CharSequence getPageTitle(int position) {
return Titles[position];
}
// This method return the Number of tabs for the tabs Strip
@Override
public int getCount() {
return NumbOfTabs;
}
}
这只不过是 nested fragment 片段内的片段（嵌套）基本上是 not supported。你也这样做，Nested fragments are not currently supported。尝试将一个片段放在另一个片段的 UI 内将导致应用程序出现未定义且可能损坏的行为..
编辑
为了引用您的观点，您应该在 class 级别声明 view(s)，例如
public class Tab1 extends Fragment {
EditTex address,contactNumber;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1,container,false);
contactNumber= (EditText)v.findViewById(R.id.editTextcontact);
address= (EditText)v.findViewById(R.id.editText2);
contactNumber.setHint("Your ContactNo Plz");
address.setHint("Your address Plz");
return v;
}
public String getData(){
return address.getText().toString();
}
}
首先声明一个全局变量来维护对正在显示的currentPage的引用
int currentPage = 0; // 0 - 因为最初显示第 0 页。
您可以使用以下方法获取对您的 Fragment 的引用：
private static String makeFragmentName(int viewPagerId, int index) {
return "android:switcher:" + viewPagerId + ":" + index;
}
上面的viewPagerId就是你的ViewPager'sid
您需要在 ViewPager 上为这个 implement addOnPageChangeListener() 显示的 current page 保留一个参考，并在 onPageSelected() 方法中更新您的 currentPage 变量.
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
currentPage = position;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
现在为了在 onOptionsItemSelected() 方法中获取数据，您可以像下面那样做
// You will need to check for the index manually and get the reference of the current `Fragment` so a solution to this can be like
if(currentPage == 0){
Tab1 tab1 = (Tab1)getSupportFragmentManager().findFragmentByTag(makeFragmentName(R.id.your_view_pager,currentPage));
// always check for null
if(tab1 != null){
String data = tab1.getData();
}
}else if(currentPage == 1){
Tab2 tab2 = (Tab2)getSupportFragmentManager().findFragmentByTag(makeFragmentName(R.id.your_view_pager,currentPage));
if(tab2 != null){
String data = tab2.getData();
}
}
... so on
在您的片段中创建方法来访问数据，例如
public String getData(){
String data = yourEditText.getText().toString();
return data;
}
同样，您也可以访问其他数据，如果您需要更多详细信息，请告诉我