Java Android:在父片段和子片段之间传递更新数据
如何将数据从“父”片段传递到“子”片段?。我已经研究了如何在片段之间传递数据,但是在我的例子中,我不能使用Java Android:在父片段和子片段之间传递更新数据,java,android,android-fragments,android-data-usage,Java,Android,Android Fragments,Android Data Usage,如何将数据从“父”片段传递到“子”片段?。我已经研究了如何在片段之间传递数据,但是在我的例子中,我不能使用活动 在我的应用程序中,我有一个活动,它通过单击活动的列表项来创建一个片段。片段创建一个类,片段从数据创建类获取持久数据,该类由循环创建。创建片段后,它会创建几个子片段,每个子片段都有不同的视图,这些视图应显示更新的数据 但我的问题是,我无法将数据从Parentfragment传递到Childfragment。我不确定这是传递问题还是创建Childfragment的问题 在我的例子中,“te
活动
在我的应用程序中,我有一个活动
,它通过单击活动
的列表项
来创建一个片段
。片段
创建一个类,片段
从数据创建类获取持久数据,该类由循环创建。创建片段
后,它会创建几个子片段,每个子片段都有不同的视图,这些视图应显示更新的数据
但我的问题是,我无法将数据从Parentfragment
传递到Childfragment
。我不确定这是传递问题还是创建Childfragment
的问题
在我的例子中,“textValueView”和“mySeries”总是空的。为什么?
父片段
public class ScreenSlidePagerActivity extends Fragment {
Bundle bundle = new Bundle();
public boolean stop = false;
private ServerFragment newServer;
//Pager Widget for animation handeling
private ViewPager mPager;
//Pager Adapter provides the pages to view pager widget
private PagerAdapter mPagerAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ViewGroup sliderFragmentView = (ViewGroup) inflater.inflate(R.layout.fragment_screen_slide, container, false);
ConnectAndReadTask myTask = new ConnectAndReadTask(ScreenSlidePagerActivity.this , "opc.tcp://10.0.2.2:52520" +
" - " + "mySinus", new NodeId(Integer.parseInt("2"), "mySinus"));
myTask.execute(new String[]{"opc.tcp://10.0.2.2:52520"});
// Initiate a ViewPager and a PagerAdapter
mPager = (ViewPager) sliderFragmentView.findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPager.setAdapter(mPagerAdapter);
return sliderFragmentView;
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position){
case 0:
return newServer.newInstance("url","url","url");
case 1:
return new GaugeFragment();
case 2:
return new GaugeFragment();
default:
return new GaugeFragment();
}
}
@Override
public int getCount() {
return 3;
}
}
@Override
public void onDestroy() {
stop = true;
super.onDestroy();
}
/**
*
* @param value
*/
public void setData(String value)
{
Log.d("ScreenSlide.SetData", value);
// mCallback.onValueSelected(value);#
bundle.putString("value", value);
ServerFragment.create(value);
newServer.setArguments(bundle);
//newServer.setData(value);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
newServer = new ServerFragment();
}
}
public class ServerFragment extends Fragment {
TextView urlTextView, nodeTextView, valueTextView;
public static String passValue;
//Graph
GraphView graphView;
public LineGraphSeries<DataPoint>mySeries;
private double graph2LastXValue = 5d;
public View myFragmentView;
public String url, namespace, nodeName;
public ServerFragment() {}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
myFragmentView = inflater.inflate(R.layout.fragment_server, container, false);
urlTextView = (TextView)myFragmentView.findViewById(R.id.urlTextView);
nodeTextView = (TextView)myFragmentView.findViewById(R.id.nodeTextView);
valueTextView = (TextView)myFragmentView.findViewById(R.id.valueTextView);
//Graph
graphView = (GraphView)myFragmentView.findViewById(R.id.graphView);
mySeries = new LineGraphSeries<DataPoint>();
mySeries.setColor(Color.RED);
graphView.addSeries(mySeries);
graphView.getViewport().setXAxisBoundsManual(true);
graphView.getViewport().setMinX(0);
graphView.getViewport().setMaxX(100);
graphView.getViewport().setMinY(-20);
graphView.getViewport().setMaxY(70);
url = getArguments().getString("url");
urlTextView.setText(getArguments().getString("url"));
nodeTextView.setText(getArguments().getString("ns") + " | " + getArguments().getString("nodeName"));
return myFragmentView;
}
public void setData() {
Bundle bundle = this.getArguments();
String value = bundle.getString("value");
graph2LastXValue += 1d;
try {
mySeries.appendData(new DataPoint(graph2LastXValue, Double.parseDouble(value)),
true, 200);
}
catch (Exception e)
{
Log.d("mySeries.appendData", e.getMessage());
}
try {
valueTextView.setText(value);
}
catch (Exception e)
{
Log.d("valueTextView", e.getMessage());
}
Log.d("Serverfragment setData:" , value);
}
@Override
public void onStart() {
super.onStart();
setData();
}
@Override
public void onDestroy() {
Log.d("ServerFragment", "disconnected");
super.onDestroy();
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public static ServerFragment newInstance(String url, String ns, String nodeName) {
ServerFragment sf = new ServerFragment();
Bundle b = new Bundle();
b.putString("url", url);
b.putString("ns", ns);
b.putString("nodeName", nodeName);
sf.setArguments(b);
return sf;
}
}
子片段
public class ScreenSlidePagerActivity extends Fragment {
Bundle bundle = new Bundle();
public boolean stop = false;
private ServerFragment newServer;
//Pager Widget for animation handeling
private ViewPager mPager;
//Pager Adapter provides the pages to view pager widget
private PagerAdapter mPagerAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ViewGroup sliderFragmentView = (ViewGroup) inflater.inflate(R.layout.fragment_screen_slide, container, false);
ConnectAndReadTask myTask = new ConnectAndReadTask(ScreenSlidePagerActivity.this , "opc.tcp://10.0.2.2:52520" +
" - " + "mySinus", new NodeId(Integer.parseInt("2"), "mySinus"));
myTask.execute(new String[]{"opc.tcp://10.0.2.2:52520"});
// Initiate a ViewPager and a PagerAdapter
mPager = (ViewPager) sliderFragmentView.findViewById(R.id.pager);
mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPager.setAdapter(mPagerAdapter);
return sliderFragmentView;
}
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch(position){
case 0:
return newServer.newInstance("url","url","url");
case 1:
return new GaugeFragment();
case 2:
return new GaugeFragment();
default:
return new GaugeFragment();
}
}
@Override
public int getCount() {
return 3;
}
}
@Override
public void onDestroy() {
stop = true;
super.onDestroy();
}
/**
*
* @param value
*/
public void setData(String value)
{
Log.d("ScreenSlide.SetData", value);
// mCallback.onValueSelected(value);#
bundle.putString("value", value);
ServerFragment.create(value);
newServer.setArguments(bundle);
//newServer.setData(value);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
newServer = new ServerFragment();
}
}
public class ServerFragment extends Fragment {
TextView urlTextView, nodeTextView, valueTextView;
public static String passValue;
//Graph
GraphView graphView;
public LineGraphSeries<DataPoint>mySeries;
private double graph2LastXValue = 5d;
public View myFragmentView;
public String url, namespace, nodeName;
public ServerFragment() {}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
myFragmentView = inflater.inflate(R.layout.fragment_server, container, false);
urlTextView = (TextView)myFragmentView.findViewById(R.id.urlTextView);
nodeTextView = (TextView)myFragmentView.findViewById(R.id.nodeTextView);
valueTextView = (TextView)myFragmentView.findViewById(R.id.valueTextView);
//Graph
graphView = (GraphView)myFragmentView.findViewById(R.id.graphView);
mySeries = new LineGraphSeries<DataPoint>();
mySeries.setColor(Color.RED);
graphView.addSeries(mySeries);
graphView.getViewport().setXAxisBoundsManual(true);
graphView.getViewport().setMinX(0);
graphView.getViewport().setMaxX(100);
graphView.getViewport().setMinY(-20);
graphView.getViewport().setMaxY(70);
url = getArguments().getString("url");
urlTextView.setText(getArguments().getString("url"));
nodeTextView.setText(getArguments().getString("ns") + " | " + getArguments().getString("nodeName"));
return myFragmentView;
}
public void setData() {
Bundle bundle = this.getArguments();
String value = bundle.getString("value");
graph2LastXValue += 1d;
try {
mySeries.appendData(new DataPoint(graph2LastXValue, Double.parseDouble(value)),
true, 200);
}
catch (Exception e)
{
Log.d("mySeries.appendData", e.getMessage());
}
try {
valueTextView.setText(value);
}
catch (Exception e)
{
Log.d("valueTextView", e.getMessage());
}
Log.d("Serverfragment setData:" , value);
}
@Override
public void onStart() {
super.onStart();
setData();
}
@Override
public void onDestroy() {
Log.d("ServerFragment", "disconnected");
super.onDestroy();
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public static ServerFragment newInstance(String url, String ns, String nodeName) {
ServerFragment sf = new ServerFragment();
Bundle b = new Bundle();
b.putString("url", url);
b.putString("ns", ns);
b.putString("nodeName", nodeName);
sf.setArguments(b);
return sf;
}
}
public类ServerFragment扩展了Fragment{
TextView URL TextView、nodeTextView、valueTextView;
公共静态字符串passValue;
//图表
GraphView GraphView;
公共线路图经验系列;
专用双图2LASTXVALUE=5d;
公共视图myFragmentView;
公共字符串url、命名空间、节点名;
公共服务器片段(){}
@可空
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
myFragmentView=充气机。充气(R.layout.fragment\u服务器,容器,false);
urlTextView=(TextView)myFragmentView.findViewById(R.id.urlTextView);
nodeTextView=(TextView)myFragmentView.findViewById(R.id.nodeTextView);
valueTextView=(TextView)myFragmentView.findViewById(R.id.valueTextView);
//图表
graphView=(graphView)myFragmentView.findViewById(R.id.graphView);
mySeries=newlinegraphseries();
setColor(Color.RED);
graphView.addSeries(mySeries);
graphView.getViewport().setXAxisBoundsManual(true);
graphView.getViewport().setMinX(0);
graphView.getViewport().setMaxX(100);
graphView.getViewport().setMinY(-20);
graphView.getViewport().setMaxY(70);
url=getArguments().getString(“url”);
urlTextView.setText(getArguments().getString(“url”);
nodeTextView.setText(getArguments().getString(“ns”)+“|”+getArguments().getString(“nodeName”));
返回myFragmentView;
}
public void setData(){
Bundle=this.getArguments();
字符串值=bundle.getString(“值”);
图2 LastX值+=1d;
试一试{
appendData(新数据点(graph2LastXValue,Double.parseDouble(value)),
对,200);
}
捕获(例外e)
{
Log.d(“mySeries.appendData”,e.getMessage());
}
试一试{
valueTextView.setText(值);
}
捕获(例外e)
{
Log.d(“valueTextView”,e.getMessage());
}
Log.d(“Serverfragment setData:”,值);
}
@凌驾
public void onStart(){
super.onStart();
setData();
}
@凌驾
公共空间{
Log.d(“ServerFragment”,“disconnected”);
super.ondestory();
}
@凌驾
创建时的公共void(@Nullable Bundle savedInstanceState){
super.onCreate(savedInstanceState);
}
公共静态ServerFragment newInstance(字符串url、字符串ns、字符串节点名){
ServerFragment sf=新的ServerFragment();
Bundle b=新Bundle();
b、 putString(“url”,url);
b、 putString(“ns”,ns);
b、 putString(“nodeName”,nodeName);
sf.setArguments(b);
返回sf;
}
}
通常的方法是将它从第一个片段传递到宿主活动,然后将它分派到第二个片段
我不知道为什么你们不能这么做,但若真的像你们说的那个样,你们可以试着使用杰克·沃顿的奥托巴士图书馆,把你们的两个片段都订阅到巴士上
class Fragment1 {
@Override
public void onResume() {
super.onResume();
mBus.register(this);
}
@Override
public void onPause() {
mBus.unregister(this);
super.onPause();
}
//let's assume you need to do it it on button click
@Override
public void onClick(View v) {
mBus.post(new SomeDataEvent())
}
}
//======================
class Fragment2 {
@Override
public void onResume() {
super.onResume();
mBus.register(this);
}
@Override
public void onPause() {
mBus.unregister(this);
super.onPause();
}
//here we define method to handle your data
@Subscribe
public void onSomeData(SomeDataEvent object) {
//do something with it
}
}
请参阅此处的更多信息通常的方法是将其从第一个片段传递到宿主活动,然后将其分派到第二个片段 我不知道为什么你们不能这么做,但若真的像你们说的那个样,你们可以试着使用杰克·沃顿的奥托巴士图书馆,把你们的两个片段都订阅到巴士上
class Fragment1 {
@Override
public void onResume() {
super.onResume();
mBus.register(this);
}
@Override
public void onPause() {
mBus.unregister(this);
super.onPause();
}
//let's assume you need to do it it on button click
@Override
public void onClick(View v) {
mBus.post(new SomeDataEvent())
}
}
//======================
class Fragment2 {
@Override
public void onResume() {
super.onResume();
mBus.register(this);
}
@Override
public void onPause() {
mBus.unregister(this);
super.onPause();
}
//here we define method to handle your data
@Subscribe
public void onSomeData(SomeDataEvent object) {
//do something with it
}
}
请参阅此处的更多信息您可以将所需数据作为参数添加到片段中。然后可以从父片段调用此方法。您所需要做的就是获取所创建片段的引用 可以使用mPagerAdapter.getItem(int位置)循环遍历片段 您还可以在创建片段时将标识符添加到片段中,以便更容易区分它们。例如,您可以执行
new gaugeefragment(identifierString)
,而不是new gaugeefragment()
。现在每个片段都可以告诉你关于“谁”的信息。也可以有不同类型的片段
PagerAdapter mPagerAdapter;
ScreenSlidePagerAdapter screenSlidePagerAdapter;
screenSlidePagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPagerAdapter = screenSlidePagerAdapter;
稍后,当您要设置数据时:
int count = screenSlidePagerAdapter .getCount();
for(int i=0;i<count;i++){
Fragment fragment = screenSlidePagerAdapter .getItem(i);
if(fragment instanceof GaugeFragment){
((GaugeFrament)fragment).gaugeFragmentMethod(data);
break;
}
else if(fragment instanceof OtherTypeOfFragment){
((OtherTypeOfFragment)fragment).otherTypeOfFragmentMethod(data);
break;
}
}
int count=screenSlidePagerAdapter.getCount();
对于(int i=0;i,您可以将一个公共方法添加到片段中,并将所需的数据作为参数。然后您可以从父片段调用此方法。您所需要做的就是获取所创建片段的引用
可以使用mPagerAdapter.getItem(int位置)循环遍历片段
您还可以在创建片段时将标识符添加到片段中,以便更容易地对其进行区分。例如,您可以执行new-gaugeeragment()
而不是new-gaugeeragment(identifierString)
。现在,每个片段都可以告诉您有关“谁”的信息。您还可以拥有不同类型的片段
PagerAdapter mPagerAdapter;
ScreenSlidePagerAdapter screenSlidePagerAdapter;
screenSlidePagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
mPagerAdapter = screenSlidePagerAdapter;
稍后,当您要设置数据时:
int count = screenSlidePagerAdapter .getCount();
for(int i=0;i<count;i++){
Fragment fragment = screenSlidePagerAdapter .getItem(i);
if(fragment instanceof GaugeFragment){
((GaugeFrament)fragment).gaugeFragmentMethod(data);
break;
}
else if(fragment instanceof OtherTypeOfFragment){
((OtherTypeOfFragment)fragment).otherTypeOfFragmentMethod(data);
break;
}
}
int count=screenSlidePagerAdapter.getCount();
for(int i=0;i在两个片段之间设置接口,并将数据从一个片段传递到另一个片段