我的viewpager适配器位于另一个片段中（即主片段中），即我在另一个片段中使用了viewpager。所以viewpager适配器有2个片段。
我从主片段连续获取心率值，需要将其发送到viewpager适配器。然后viewpager适配器将此值发送到片段并在此处更新textview。
//主片段是我使用更新的心率值初始化fragmentpageradapter： - ((readingdata)samplePagerAdapter).passdata(value);
使用接口更新值： -
public interface readingdata
{
void passdata(int value);
}
//适配器代码： -
public class SamplePagerAdapter extends FragmentStatePagerAdapter implements readingdata {
private final Random random = new Random();
private int mSize = 2;
private int heart_rate;
FragmentManager fm;
private Map<Integer, String> mFragmentTags;
public SamplePagerAdapter(FragmentActivity activity, FragmentManager supportFragmentManager, int heart) {
super(supportFragmentManager);
fm = supportFragmentManager;
mFragmentTags = new HashMap<Integer, String>();
}
@Override
public int getCount() {
return mSize;
}
@Override
public Fragment getItem(int position) {
Fragment f = null;
if (position == 0) {
f = new MyFragment().newInstance(heart_rate);
} else if (position == 1) {
f = new SecondFragment();
}
return f;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
Object object = super.instantiateItem(container, position);
if (object instanceof Fragment) {
Fragment fragment = (Fragment) object;
String tag = fragment.getTag();
mFragmentTags.put(position, tag);
}
return object;
}
public Fragment getFragment(int position) {
Fragment fragment = null;
String tag = mFragmentTags.get(position);
if (tag != null) {
fragment = fm.findFragmentByTag(tag);
}
return fragment;
}
@Override
public void passdata(int value) {
heart_rate=value;
}
}
//片段代码是定期更新的textview
public class MyFragment extends Fragment{
private int heart_rate;
private ArcProgress arc_progress;
private TextView tv_heartrate;
private Handler handler;
private Runnable runnable;
private View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saveBundle) {
view = inflater.inflate(R.layout.ecg_layout, container, false);
handler=new Handler();
arc_progress = (ArcProgress) view.findViewById(R.id.arc_progress);
tv_heartrate = (TextView) view.findViewById(R.id.tv_heart_rate);
handler=new Handler();
handler.post(runnable = new Runnable() {
@Override
public void run() {
MyFragment myFragment=new MyFragment();
arc_progress.setProgress(heart_rate);
tv_heartrate.setText(String.valueOf(heart_rate));
handler.postDelayed(this, 1000);
}
});
return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
public static Fragment newInstance(int heartvalue) {
MyFragment f = new MyFragment();
f.heart_rate = heartvalue;
return f;
}
}
那么我应该如何在片段内连续更新textview？
答案 0 :(得分：1)
在MainFragment中
private static HeartRateListener heartRateListener;
public static void setHeartRateListener(HeartRateListener listener){
heartRateListener = listener;
}
public static interface HeartRateListener{
void onHeartRate(int yourValue);
}
// Send your continuously updated value
heartRateListener.onHeartRate(yourValue);
在ViewPager片段中（在onViewCreated（）内部）
MainFragment.setHeartRateListener(new MainFragment.HeartRateListener() {
@Override
public void onHeartRate(int yourValue) {
// Update your textview with yourValue
}
});
答案 1 :(得分：0)
create Method
public void updateScreenData(String text)
{
tv_heartrate.setText(text);
}
in fragment and then call this method from activity
make sure that fragment reference is not null whenever call this method
答案 2 :(得分：0)
Take Help from this and save reference to view you are inflating
package com.mtg.workapp_v2.listing.wanted.add_wanted;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import com.mtg.classes.AddressView;
import com.mtg.classes.ListingVisibilityLayout;
import com.mtg.utils.CommonMethods;
import com.mtg.workapp.R;
public class WantedBasicInfoFragment extends Fragment implements View.OnClickListener{
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
View FragmentView ;
Context myContext;
TextView text_continue;
EditText edit_title;
EditText edit_description;
private OnFragmentInteractionListener mListener;
//this is add by ahsan according to new design
ListingVisibilityLayout listingVisibilityLayout = null;
public WantedBasicInfoFragment() {
}
public static WantedBasicInfoFragment newInstance(String param1, String param2) {
WantedBasicInfoFragment fragment = new WantedBasicInfoFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
FragmentView= inflater.inflate(R.layout.fragment_wanted_basic, container, false);
init();
return FragmentView;
}
/********************************************************************************/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
/********************************************************************************/
public void setListener(OnFragmentInteractionListener listener) {
this.mListener = listener;
}
/********************************************************************************/
public void setInitValues()
{
}
/***********************************************************************************/
public void updateScreenData()
{
edit_title.setText(wantedInformation.csName);
edit_description.setText(wantedInformation.csDescription);
}
/***********************************************************************************/
public void init()
{
myContext=getActivity();
text_continue=(TextView) FragmentView.findViewById(R.id.text_continue);
edit_title = (EditText) FragmentView.findViewById(R.id.edit_title);
edit_description = (EditText) FragmentView.findViewById(R.id.edit_description);
text_continue.setOnClickListener(this);
edit_title.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
wantedInformation.csListingLanguage = CommonMethods.getInputLanguage(myContext);
}
@Override
public void afterTextChanged(Editable s) {
wantedInformation.csListingLanguage = CommonMethods.getInputLanguage(myContext);
}
});
initVisibilitySpinner();
}
/***********************************************************************************/
public void initVisibilitySpinner()
{
listingVisibilityLayout = new ListingVisibilityLayout(myContext);
View visibilityView = (View)FragmentView.findViewById(R.id.id_visibility_layout);
listingVisibilityLayout.ListingVisibilityInit(visibilityView);
}
/***********************************************************************************/
@Override
public void onClick(View view) {
int itemID = view.getId();
switch (itemID) {
case R.id.text_continue:
{
moveToNextScreen(true);
}
}
}
/***********************************************************************************/
public void moveToNextScreen(boolean isContinueClicked)
{
String csName = edit_title.getText().toString().trim();
String csDescription = edit_description.getText().toString().trim();
if(csName.length() <= 0 && csDescription.toString().length() <= 0)
{
CommonMethods.showMessageBox("", getResources().getString(R.string.id_please_enter_name_and_description), myContext);
return;
}
else if(csName.length() <= 0)
{
CommonMethods.showMessageBox("", getResources().getString(R.string.id_please_enter_name), myContext);
return;
}
else if(csDescription.length() <= 0)
{
CommonMethods.showMessageBox("", getResources().getString(R.string.id_please_enter_description), myContext);
return;
}
else if(listingVisibilityLayout.selectedProfileVisibility.csOptionID.equalsIgnoreCase("-1"))
{
CommonMethods.showMessageBox("", getResources().getString(R.string.id_select_visibility_option_msg), myContext);
return;
}
wantedInformation.csName = csName;
wantedInformation.csDescription = csDescription;
wantedInformation.visibilityOption = listingVisibilityLayout.selectedProfileVisibility;
//MH: If continue clicked then continue Button listener will be called
//MH: If only tick is clicked in Edit Mode then onUpdate listener will be called
//MH: and data will be updated before sent to api
//MH: The below statements are repeated in all fragments of Wanted
if(isContinueClicked)
mListener.continueButtonPressed(wantedInformation);
else
mListener.onUpdate(wantedInformation);
}
}