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我正在做一個簡單的android編程培訓。 我的應用程序擁有一個ArrayList的人。 點擊「get count」，爲結果開始一個新的活動，當用戶返回主活動時，它應該顯示新片段中的人數。 問題是，當FragmentManager添加片段（在.commit行中）時，應用程序崩潰。 這是我的代碼：程序崩潰後通過插入一個新的片段從活動返回
mainActivity：
package com.example.myapp;
import java.util.ArrayList;
import java.util.Hashtable;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.FragmentManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class MainActivity extends ActionBarActivity {
private final int GET_COUNT = 0;
private Button mAddButton;
private Button mAddPictureButton;
private EditText mFirstName;
private EditText mLastName;
private EditText mId;
private ListView listView;
protected ArrayList<Person> mPersonList;
protected ArrayAdapter<Person> mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
if (mPersonList == null){
mPersonList = new ArrayList<Person>();
}
if (mAdapter == null){
mAdapter = new ArrayAdapter<Person>(this,
android.R.layout.simple_list_item_1,
mPersonList);
listView.setAdapter(mAdapter);
}
mAddButton = (Button) findViewById(R.id.add);
mAddButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mId = (EditText) findViewById(R.id.id);
mFirstName = (EditText) findViewById(R.id.firstName);
mLastName = (EditText) findViewById(R.id.lastName);
Person p1 = new Person(Integer.parseInt(mId.getText().toString()),
mFirstName.getText().toString(),
mLastName.getText().toString());
mPersonList.add(p1);
mAdapter.notifyDataSetChanged();
mId.setText("");
mFirstName.setText("");
mLastName.setText("");
}
});
mAddPictureButton = (Button) findViewById(R.id.getCount);
mAddPictureButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, GetCount.class);
intent.putExtra("personList", mPersonList);
startActivityForResult(intent, GET_COUNT);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// Check which request we're responding to
if (requestCode == GET_COUNT) {
FragmentManager fm = getSupportFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.fragmentContainer);
if (fragment == null) {
fragment = new BlankFragment();
fm.beginTransaction()
.add(R.id.fragmentContainer, fragment)
.commit();
}
TextView tv= (TextView) findViewById(R.id.count);
int count = data.getIntExtra("count", 0);
tv.setText("" + count);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
mainActivity佈局：
<?xml version="1.0" encoding="utf-8"?>
<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" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/firstName" />
<EditText android:id="@+id/firstName"
android:layout_width="50dp"
android:inputType="text"
android:hint =""
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/lastName" />
<EditText android:id="@+id/lastName"
android:layout_width="50dp"
android:inputType="text"
android:hint =""
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/id" />
<EditText android:id="@+id/id"
android:layout_width="50dp"
android:inputType="text"
android:hint =""
android:layout_height="wrap_content" />
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/getCount"
android:id="@+id/getCount"/>
<FrameLayout
android:id="@+id/fragmentContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/add"
android:id="@+id/add"/>
<ListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
GetCountActivity：
package com.example.myapp;
import java.util.ArrayList;
import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class GetCount extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_get_count);
@SuppressWarnings("unchecked")
ArrayList<Person> persons = (ArrayList<Person>) getIntent().getSerializableExtra("personList");
int count = 0;
for (@SuppressWarnings("unused") Person person : persons)
{
count++;
}
Intent data = new Intent();
data.putExtra("count", count);
setResult(RESULT_OK, data);
}
}
getCount將佈局：
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.myapp.GetCount" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/counting" />
</RelativeLayout>
countFragment：
package com.example.myapp;
import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {@link Fragment} subclass. Activities that contain this fragment
* must implement the {@link CountFragment.OnFragmentInteractionListener}
* interface to handle interaction events. Use the
* {@link CountFragment#newInstance} factory method to create an instance of
* this fragment.
*
*/
public class CountFragment extends Fragment {
public static CountFragment newInstance(String param1, String param2) {
CountFragment fragment = new CountFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
public CountFragment() {
// Required empty public constructor
}
@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
return inflater.inflate(R.layout.fragment_blank, container, false);
}
}
片段佈局：
<FrameLayout 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"
tools:context="com.example.myapp.CountFragment" >
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:id="@+id/count" />
</FrameLayout>
人：
package com.example.myapp;
public class Person implements java.io.Serializable{
private int id;
private String firstName;
private String lastName;
public Person(){}
public Person(int id, String firstName, String lastName){
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
}
@Override
public String toString() {
return "Person [id=" + id + ", firstName=" + firstName + ", lastName="
+ lastName + "]";
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
logcat的：
11-04 04:34:10.082: D/libEGL(4656): loaded /system/lib/egl/libEGL_genymotion.so
11-04 04:34:10.082: D/(4656): HostConnection::get() New Host Connection established 0xb7f189f8, tid 4656
11-04 04:34:10.110: D/libEGL(4656): loaded /system/lib/egl/libGLESv1_CM_genymotion.so
11-04 04:34:10.114: D/libEGL(4656): loaded /system/lib/egl/libGLESv2_genymotion.so
11-04 04:34:10.222: W/EGL_genymotion(4656): eglSurfaceAttrib not implemented
11-04 04:34:10.222: E/OpenGLRenderer(4656): Getting MAX_TEXTURE_SIZE from GradienCache
11-04 04:34:10.230: E/OpenGLRenderer(4656): Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
11-04 04:34:10.230: D/OpenGLRenderer(4656): Enabling debug mode 0
11-04 04:34:39.834: W/EGL_genymotion(4656): eglSurfaceAttrib not implemented
11-04 04:34:41.242: D/AndroidRuntime(4656): Shutting down VM
11-04 04:34:41.242: W/dalvikvm(4656): threadid=1: thread exiting with uncaught exception (group=0xa4c1b648)
11-04 04:34:41.246: E/AndroidRuntime(4656): FATAL EXCEPTION: main
11-04 04:34:41.246: E/AndroidRuntime(4656): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=Intent { (has extras) }} to activity {com.example.myapp/com.example.myapp.MainActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.app.ActivityThread.deliverResults(ActivityThread.java:3367)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3410)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.app.ActivityThread.access$1100(ActivityThread.java:141)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.os.Handler.dispatchMessage(Handler.java:99)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.os.Looper.loop(Looper.java:137)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.app.ActivityThread.main(ActivityThread.java:5103)
11-04 04:34:41.246: E/AndroidRuntime(4656): at java.lang.reflect.Method.invokeNative(Native Method)
11-04 04:34:41.246: E/AndroidRuntime(4656): at java.lang.reflect.Method.invoke(Method.java:525)
11-04 04:34:41.246: E/AndroidRuntime(4656): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
11-04 04:34:41.246: E/AndroidRuntime(4656): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-04 04:34:41.246: E/AndroidRuntime(4656): at dalvik.system.NativeStart.main(Native Method)
11-04 04:34:41.246: E/AndroidRuntime(4656): Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1360)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1378)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
11-04 04:34:41.246: E/AndroidRuntime(4656): at com.example.myapp.MainActivity.onActivityResult(MainActivity.java:92)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.app.Activity.dispatchActivityResult(Activity.java:5322)
11-04 04:34:41.246: E/AndroidRuntime(4656): at android.app.ActivityThread.deliverResults(ActivityThread.java:3363)
11-04 04:34:41.246: E/AndroidRuntime(4656): ... 11 more
我做了你的兩個第一個建議，但它仍然是crasing。如果您將片段佈局放入
是否仍然與您在OP中發佈的日誌相同？ – 2014-11-04 03:34:50
如果是，那麼我已經編輯了一篇文章的鏈接，解釋了爲什麼你會看到這個異常以及如何解決它。 – 2014-11-04 03:40:53