我正在开发一个应用程序，其中有一个扩展 FragmentActivity 的类。在 onResume() 方法中，我调用了一个类，我正在为其发送该片段活动的引用，并且在该类中，我将其替换为另一个片段。
在那个片段中，我正在动态添加布局，但是当我单击按钮时，我正在调用 startActivityForResult() ，它反过来在 OnActivityResult() 中接收结果，我正在尝试更新 EditText 的文本，但它是没有发生。当我单击后退按钮时，我可以看到 EditText 上的文本已更改。谁能帮我解决这个问题。我将在这里发布我的全部源代码。
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>