无法从更新片段UI的onActivityResult [英] Not able to update Fragment UI from onActivityResult
问题描述
我工作的一个应用程序在具有延伸FragmentActivity一类。
在onResume（）方法，我打电话一类而我送这个fragmentactivity参考，并在该类我与另一片段取代它。
在该片段，我动态添加的布局，但是当我点击我打电话startActivityForResult（）反过来在收到的onActivityResult结果的按钮（）中，我试图更新的EditText的文字，但它没有发生。当我点击后退按钮我能看到的文字上的EditText改变。谁能帮我整理出这个问题。 I'will在这里发表我的整个源$ C $ C。结果
MainActivity.java
公共类MainActivity扩展FragmentActivity {// FragmentActivity语境;
上下文语境;
FragmentManager调频;
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.main）; 上下文= MainActivity.this; / * FM = getSupportFragmentManager（）;
FragmentManager FM = getSupportFragmentManager（）;
片段multiFormScreenFragment = MultiFormScreenFragment.newInstance（1）;
fm.beginTransaction（）
.replace（R.id.fragment_container，multiFormScreenFragment）
。承诺（）;
* /
}
@覆盖
保护无效onResume（）{
// TODO自动生成方法存根
super.onResume（）;
新LoadScreenHelper（（FragmentActivity）上下文，R.id.fragment_container）.loadTargetScreen（，1，，1，假，，，）;
} }
LoadScreenHelper.java
包com.cognizant.aim.LoadScreen; 进口com.android.testfragmentactivityresult.MultiFormScreenFragment; 公共类LoadScreenHelper {公共FragmentActivity语境;
//公共上下文的背景下;
INT mContainerId = -1;
公共LoadScreenHelper（FragmentActivity C中，int containerId）{ 上下文= C;
mContainerId = containerId;
}
公共无效loadTargetScreen（字符串screenType，INT nav_id，字符串USID，INT screenorder，布尔isMain，字符串filterColumnName，字符串filterColumnVal，字符串uiHeadingTitle）{// uiHeadingTitle 的System.out.println（ScreenType ::::+ screenType +nav_id+ nav_id +:::+screenorder ::::+ screenorder）; 束束=新包（）;
bundle.putInt（screenOrder，1）;
bundle.putString（UNIQUEID，1）;
bundle.putString（称号，表）;
// bundle.putString（tableName值，dataSourceTableName）;
// bundle.putString（ROWID，clicked_list_row_Id）; FragmentManager FM = context.getSupportFragmentManager（）;
片段multiFormScreenFragment = MultiFormScreenFragment.newInstance（1 / * screenId * /）;
multiFormScreenFragment.setArguments（包）;
如果（isMain）{
fm.beginTransaction（）
.replace（mContainerId，multiFormScreenFragment）
。承诺（）;
}
其他{
fm.beginTransaction（）
.replace（mContainerId，multiFormScreenFragment）
.addToBackStack（空）
。承诺（）; }} }
MultiFormScreenFragment.java
公共类MultiFormScreenFragment扩展片段{
查看视图。
INT mContainerId = -1;
私有静态最后弦乐TAG =MultiFormScreenFragment;
的LinearLayout llayout;
公共静态的newInstance MultiFormScreenFragment（INT PARENTID）{
MultiFormScreenFragment F =新MultiFormScreenFragment（）;
束B =新包（）;
b.putInt（LIST_ID，PARENTID）;
f.setArguments（二）;
返回F;
}@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
// TODO自动生成方法存根
super.onCreate（savedInstanceState）;
}
@覆盖
公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，
捆绑savedInstanceState）{
// TODO自动生成方法存根
mContainerId = container.getId（）;
鉴于= inflater.inflate（R.layout.activity_main，集装箱，FALSE）;
llayout =（的LinearLayout）view.findViewById（R.id.llayout）;
generateUILayout（）; 返回视图。
}私人无效generateUILayout（）{
// TODO自动生成方法存根
LinearLayout.LayoutParams PARAMS =新LinearLayout.LayoutParams（
LinearLayout.LayoutParams.WRAP_CONTENT，LinearLayout.LayoutParams.WRAP_CONTENT）;
按钮newBtn =新按钮（getActivity（））;
newBtn.setLayoutParams（PARAMS）;
newBtn.setId（1）;
newBtn.setText（演示）;
llayout.addView（newBtn）; 的EditText newEText =新的EditText（getActivity（））;
newBtn.setLayoutParams（PARAMS）;
newEText.setId（2）;
newEText.setText（演示）; llayout.addView（newEText）; newBtn.setOnClickListener（新OnClickListener（）{ @覆盖
公共无效的onClick（视图v）{
// TODO自动生成方法存根
意向意图=新意图（getActivity（），SecondActivity.class）;
intent.putExtra（sampleData在，这是示例数据）;
startActivityForResult（意向，1）; }
}）;
}
@覆盖
公共无效的onActivityResult（INT申请code，INT结果code，意图数据）{
// TODO自动生成方法存根
super.onActivityResult（要求code，结果code，数据）;
如果（结果code == getActivity（）RESULT_OK和放大器;＆安培;请求code == 1）{
弦乐味精= data.getStringExtra（returnedData）;
的EditText ETEXT =（的EditText）getActivity（）findViewById（2）。
eText.setText（MSG）;
}
} }
SecondActivity.java
=================== 包com.android.testfragmentactivityresult; 进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
公共类SecondActivity延伸活动{ @覆盖
保护无效的onCreate（捆绑savedInstanceState）{
// TODO自动生成方法存根
super.onCreate（savedInstanceState）;
意向意图= getIntent（）;
弦乐味精= intent.getStringExtra（的sampleData）;
味精+ =，在添加三;
intent.putExtra（returnedData，味精）;
的setResult（RESULT_OK，意向）;
完（）;
}
}
activity_main.xml中
================== ＆LT; LinearLayout中的xmlns：机器人=http://schemas.android.com/apk/res/android
的xmlns：工具=http://schemas.android.com/tools
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：方向=垂直
机器人：ID =@ + ID / llayout＆GT; ＆LT; / LinearLayout中＆GT;
main.xml中
========
＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; LinearLayout中的xmlns：机器人=http://schemas.android.com/apk/res/android
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：方向=垂直＆GT; ＆LT;的FrameLayout
机器人：ID =@ + ID / fragment_container
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：layout_weight =1/＆GT; ＆LT; / LinearLayout中＆GT;
AndroidManifest.xml中
===================
＆LT;清单的xmlns：机器人=http://schemas.android.com/apk/res/android
包=com.android.testfragmentactivityresult
安卓版code =1
机器人：=的versionName1.0＆GT; ＆LT;用途-SDK
安卓的minSdkVersion =8
机器人：targetSdkVersion =15/＆GT; ＆lt;应用
机器人：图标=@绘制/ ic_launcher
机器人：标签=@字符串/ APP_NAME
机器人：主题=@风格/ AppTheme＆GT;
＆LT;活动
机器人：名字=。MainActivity
机器人：标签=@字符串/ title_activity_main＆GT;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.intent.action.MAIN/＆GT; ＆LT;类机器人：名字=android.intent.category.LAUNCHER/＆GT;
＆所述; /意图滤光器＆gt;
＆LT; /活性GT; ＆LT;活动
机器人：名字=.SecondActivity
＆GT;＆LT; /活性GT;
＆LT; /用途＆gt; ＆LT; /清单＆GT;
...但是当我点击我打电话startActivityForResult按钮（）
这反过来又接收的onActivityResult（），其中我结果
尝试更新的EditText的文本，但它没有发生。什么时候
我点击后退按钮，我能够看到的EditText文字修改我想这是因为在<$ C $的
onResume方法使用LoadScreenHelper的发生C> FragmentActivity 。请记住，onResume总是会活动时谈到foregound叫，这也将发生在活动后开始与startActivityForResult将返回。现在，通过调用的loadTargetScreen（）方法，你永远添加一个新的初始LoadScreenHelperMultiFormScreenFragmentFragmentActivity。当你从孩子回来活动的onResume方法将被再次调用一个新的MultiFormScreenFragment将创建最有可能覆盖最初添加片段。如果您单击后退按钮这顶片段会从屏幕上留下最初加入的片段被删除。由于我不知道你想与
LoadScreenHelper班结束时，我会建议要么做招行是什么：新LoadScreenHelper（（FragmentActivity）的背景下，R.id.fragment_container）.loadTargetScreen（，1，1，假的，，，） ;在
的onCreate方法，因此它只执行一次，或插入在loadTargetScreen的方法进行检查，找出如果一个实例MultiFormScreenFragment是不是已经在布局（使用FragmentManager找到片段）。如果是已经在布局那么就没有别的添加片段的新实例。I'm working on an app in which has a class that extends FragmentActivity. In the onResume() method I was calling a class for which I am sending the reference of this fragmentactivity and in that class I'm replacing it with another fragment.
In that Fragment I'm dynamically adding the layout , but when I click on the button I'm Calling startActivityForResult() which in turn receives results in OnActivityResult() in which I'm trying to update the text of EditText , but it is not happening. When I clicked back button I'm able to see the text on EditText changed . Can anyone help me in sorting out this issue. I'will post my entire source code here .
MainActivity.java:
public class MainActivity extends FragmentActivity { //FragmentActivity context; Context context; FragmentManager fm; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); context = MainActivity.this; /* fm = getSupportFragmentManager(); FragmentManager fm = getSupportFragmentManager(); Fragment multiFormScreenFragment = MultiFormScreenFragment.newInstance(1 ); fm.beginTransaction() .replace(R.id.fragment_container, multiFormScreenFragment) .commit(); */ } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); new LoadScreenHelper((FragmentActivity)context, R.id.fragment_container).loadTargetScreen("", 1,"",1,false,"","",""); } }LoadScreenHelper.java:
package com.cognizant.aim.LoadScreen; import com.android.testfragmentactivityresult.MultiFormScreenFragment; public class LoadScreenHelper { public FragmentActivity context; //public Context context; int mContainerId=-1; public LoadScreenHelper(FragmentActivity c,int containerId){ context = c; mContainerId = containerId ; } public void loadTargetScreen(String screenType,int nav_id,String usid,int screenorder, boolean isMain,String filterColumnName,String filterColumnVal,String uiHeadingTitle){//uiHeadingTitle System.out.println("ScreenType::::"+screenType+"nav_id"+nav_id+":::"+"screenorder::::"+screenorder); Bundle bundle = new Bundle(); bundle.putInt("screenOrder", 1); bundle.putString("uniqueid", "1"); bundle.putString("title", "Form"); // bundle.putString("tableName", dataSourceTableName); // bundle.putString("rowId", clicked_list_row_Id); FragmentManager fm = context.getSupportFragmentManager(); Fragment multiFormScreenFragment = MultiFormScreenFragment.newInstance(1 /*screenId*/); multiFormScreenFragment.setArguments(bundle); if(isMain){ fm.beginTransaction() .replace(mContainerId, multiFormScreenFragment) .commit(); } else{ fm.beginTransaction() .replace(mContainerId, multiFormScreenFragment) .addToBackStack("null") .commit(); } } }MultiFormScreenFragment.java:
public class MultiFormScreenFragment extends Fragment { View view; int mContainerId = -1; private static final String TAG = "MultiFormScreenFragment"; LinearLayout llayout; public static MultiFormScreenFragment newInstance(int parentid) { MultiFormScreenFragment f = new MultiFormScreenFragment(); Bundle b = new Bundle(); b.putInt("list_id", parentid); f.setArguments(b); return f; } @Override public void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub mContainerId = container.getId(); view = inflater.inflate(R.layout.activity_main, container, false); llayout = (LinearLayout)view.findViewById(R.id.llayout); generateUILayout(); return view; } private void generateUILayout() { // TODO Auto-generated method stub LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); Button newBtn = new Button(getActivity()); newBtn.setLayoutParams(params); newBtn.setId(1); newBtn.setText("Demo"); llayout.addView(newBtn); EditText newEText = new EditText(getActivity()); newBtn.setLayoutParams(params); newEText.setId(2); newEText.setText("Demo"); llayout.addView(newEText); newBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent = new Intent(getActivity(), SecondActivity.class); intent.putExtra("sampleData", "This is Sample Data"); startActivityForResult(intent, 1); } }); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if(resultCode==getActivity().RESULT_OK && requestCode==1){ String msg = data.getStringExtra("returnedData"); EditText eText = (EditText)getActivity().findViewById(2); eText.setText(msg); } } } SecondActivity.java =================== package com.android.testfragmentactivityresult; import android.app.Activity; import android.content.Intent; import android.os.Bundle; public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); Intent intent= getIntent(); String msg = intent.getStringExtra("sampleData"); msg += ", Added at Third"; intent.putExtra("returnedData", msg); setResult(RESULT_OK, intent); finish(); } } activity_main.xml ================== <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:id="@+id/llayout"> </LinearLayout> main.xml ======== <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <FrameLayout android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" /> </LinearLayout> AndroidManifest.xml =================== <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.android.testfragmentactivityresult" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/title_activity_main" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name = ".SecondActivity" ></activity> </application> </manifest>
解决方案...but when I click on the button I'm Calling startActivityForResult() which in turn receives results in OnActivityResult() in which I'm trying to update the text of EditText , but it is not happening. When I clicked back button I'm able to see the text on EditText changed
I think this is happening because of the use of
LoadScreenHelperin theonResumemethod of theFragmentActivity. Keep in mind thatonResumewill always be called when the activity comes to the foregound, this will also happen after theActivitystarted withstartActivityForResultwill return. Now by callingLoadScreenHelper'sloadTargetScreen()method, you'll always add a newMultiFormScreenFragmentto the initialFragmentActivity. When you come back from the childActivitytheonResumemethod will be called again and a newMultiFormScreenFragmentwill be created most likely covering the initially added fragment. If you click the back button this top fragment will be removed from the screen leaving the initially added fragment.As I don't know what you're trying to do in the end with the
LoadScreenHelperclass I would suggest to either move the line:new LoadScreenHelper((FragmentActivity)context, R.id.fragment_container).loadTargetScreen("", 1,"",1,false,"","","");in the
onCreatemethod so it's executed only once, or insert a check in theloadTargetScreenmethod to find out if an instance of theMultiFormScreenFragmentisn't already in the layout(use theFragmentManagerto find the fragment). If it is already in the layout then do nothing else add a new instance of the fragment.这篇关于无法从更新片段UI的onActivityResult的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
