Activity（有时应用程序）在选择导航项时关闭
Activity (sometimes app) closes when Navigation item is selected
我有一个 android 应用程序，其中包含 MainActivity、Main2Activity 和 NewVisitFragment。 Main2Activity（我有导航视图）在单击 MainActivity 按钮后打开。
出于某些原因，当我 select 导航项 {'New visit'}（更准确地说 - 当我尝试打开新片段时）Main2Activity 关闭。有时整个应用程序都会关闭。
我试图在 android studio 中找到调试器的问题，"walked" 在以下 类:
Main2Activity --> NavigationView.java --> MenuItemImpl.java --> MenuBuilder.java --> NavigationMenuPresenter.java --> View.java --> handler.java -- looper.java
并在 looper.java 中完成且没有错误代码，在 loop 方法中：
finally {
if (traceTag != 0) {
Trace.traceEnd(traceTag); //finished here
}
}
我已经从 templete 创建了 Main2Activity，所以我除了以下内容外没有做任何更改：
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
displayView(item.getItemId());
return true;
}
public void displayView(int viewID){
Fragment fragment = null;
String title = getString(R.string.app_name);
switch(viewID){
case R.id.nav_new_visit:
fragment = new NewVisitFragment();
title = "New Visit";
break;
case R.id.nav_visits:
title = "Visits";
break;
}
if(fragment != null){
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame,fragment);
ft.commit();
}
if(getSupportActionBar() != null){
getSupportActionBar().setTitle(title);
}
DrawerLayout drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
drawerLayout.closeDrawer(GravityCompat.START);
}
这是 activity_main2_drawer.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_new_visit"
android:icon="@drawable/ic_menu_camera"
android:title="New Visit" />
<item
android:id="@+id/nav_visits"
android:icon="@drawable/ic_menu_gallery"
android:title="Visits" />
<item
android:id="@+id/nav_slideshow"
android:icon="@drawable/ic_menu_slideshow"
android:title="A" />
<item
android:id="@+id/nav_manage"
android:icon="@drawable/ic_menu_manage"
android:title="options" />
</group>
<item android:title="Other">
<menu>
<item
android:id="@+id/nav_share"
android:icon="@drawable/ic_menu_share"
android:title="something 1" />
<item
android:id="@+id/nav_send"
android:icon="@drawable/ic_menu_send"
android:title="something 2" />
</menu>
</item>
这是 activity_main2.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<android.support.v7.widget.ContentFrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content_frame">
</android.support.v7.widget.ContentFrameLayout>
<include
layout="@layout/app_bar_main2"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_main2"
app:menu="@menu/activity_main2_drawer" />
</android.support.v4.widget.DrawerLayout>
NewVisitFragment 中的代码也会自动生成：
package com.example.ddd;
import android.content.Context;
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 NewVisitFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link NewVisitFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class NewVisitFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public NewVisitFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment NewVisitFragment.
*/
// TODO: Rename and change types and number of parameters
public static NewVisitFragment newInstance(String param1, String param2) {
NewVisitFragment fragment = new NewVisitFragment();
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);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_new_visit, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
fragment_new_visit.xml 看起来像这样：
<?xml version="1.0" encoding="utf-8"?>
<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"
android:background="@color/colorPrimaryDark"
tools:context=".NewVisitFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
</FrameLayout>
这是Logcat:
09-24 11:07:44.160 13926-13926/? I/com.example.dd: Not late-enabling -Xcheck:jni (already on)
09-24 11:07:44.221 13926-13926/? W/com.example.dd: Unexpected CPU variant for X86 using defaults: x86
09-24 11:07:44.243 13926-13937/? E/com.example.dd: Failed to send jdwp-handshake response.: Broken pipe
09-24 11:07:44.284 13926-13926/? I/com.example.dd: The ClassLoaderContext is a special shared library.
09-24 11:07:44.378 13926-13926/? W/com.example.dd: JIT profile information will not be recorded: profile file does not exits.
09-24 11:07:44.381 13926-13926/? I/chatty: uid=10086(com.example.ddd) identical 10 lines
09-24 11:07:44.381 13926-13926/? W/com.example.dd: JIT profile information will not be recorded: profile file does not exits.
09-24 11:07:44.394 13926-13926/? I/InstantRun: starting instant run server: is main process
09-24 11:07:44.528 13926-13926/? W/com.example.dd: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (light greylist, reflection)
Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (light greylist, reflection)
09-24 11:07:44.632 13926-13926/? D/OpenGLRenderer: Skia GL Pipeline
09-24 11:07:44.684 13926-13951/? I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
09-24 11:07:44.685 13926-13951/? I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasHDRDisplay retrieved: 0
09-24 11:07:44.685 13926-13951/? I/OpenGLRenderer: Initialized EGL, version 1.4
09-24 11:07:44.685 13926-13951/? D/OpenGLRenderer: Swap behavior 1
09-24 11:07:44.686 13926-13951/? W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
09-24 11:07:44.686 13926-13951/? D/OpenGLRenderer: Swap behavior 0
09-24 11:07:44.695 13926-13951/? D/EGL_emulation: eglCreateContext: 0xe0085360: maj 3 min 1 rcv 4
09-24 11:07:44.765 13926-13951/? D/EGL_emulation: eglMakeCurrent: 0xe0085360: ver 3 1 (tinfo 0xe0083680)
09-24 11:07:44.767 13926-13951/? E/eglCodecCommon: glUtilsParamSize: unknow param 0x000082da
glUtilsParamSize: unknow param 0x000082da
09-24 11:07:44.841 13926-13951/? D/EGL_emulation: eglMakeCurrent: 0xe0085360: ver 3 1 (tinfo 0xe0083680)
09-24 11:07:44.973 13926-13926/? I/AssistStructure: Flattened final assist data: 3360 bytes, containing 1 windows, 11 views
如果您的上下文未实现特定接口，您将在 NewVisitFragment 的 onAttach() 方法中抛出 RuntimeException。但是您的 activity 没有实现 OnFragmentInteractionListener 接口。这就是为什么当您打开片段时，您的应用程序崩溃了。
我有一个 android 应用程序，其中包含 MainActivity、Main2Activity 和 NewVisitFragment。 Main2Activity（我有导航视图）在单击 MainActivity 按钮后打开。
出于某些原因，当我 select 导航项 {'New visit'}（更准确地说 - 当我尝试打开新片段时）Main2Activity 关闭。有时整个应用程序都会关闭。
我试图在 android studio 中找到调试器的问题，"walked" 在以下 类:
Main2Activity --> NavigationView.java --> MenuItemImpl.java --> MenuBuilder.java --> NavigationMenuPresenter.java --> View.java --> handler.java -- looper.java
并在 looper.java 中完成且没有错误代码，在 loop 方法中：
finally {
if (traceTag != 0) {
Trace.traceEnd(traceTag); //finished here
}
}
我已经从 templete 创建了 Main2Activity，所以我除了以下内容外没有做任何更改：
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
displayView(item.getItemId());
return true;
}
public void displayView(int viewID){
Fragment fragment = null;
String title = getString(R.string.app_name);
switch(viewID){
case R.id.nav_new_visit:
fragment = new NewVisitFragment();
title = "New Visit";
break;
case R.id.nav_visits:
title = "Visits";
break;
}
if(fragment != null){
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame,fragment);
ft.commit();
}
if(getSupportActionBar() != null){
getSupportActionBar().setTitle(title);
}
DrawerLayout drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
drawerLayout.closeDrawer(GravityCompat.START);
}
这是 activity_main2_drawer.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_new_visit"
android:icon="@drawable/ic_menu_camera"
android:title="New Visit" />
<item
android:id="@+id/nav_visits"
android:icon="@drawable/ic_menu_gallery"
android:title="Visits" />
<item
android:id="@+id/nav_slideshow"
android:icon="@drawable/ic_menu_slideshow"
android:title="A" />
<item
android:id="@+id/nav_manage"
android:icon="@drawable/ic_menu_manage"
android:title="options" />
</group>
<item android:title="Other">
<menu>
<item
android:id="@+id/nav_share"
android:icon="@drawable/ic_menu_share"
android:title="something 1" />
<item
android:id="@+id/nav_send"
android:icon="@drawable/ic_menu_send"
android:title="something 2" />
</menu>
</item>
这是 activity_main2.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<android.support.v7.widget.ContentFrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content_frame">
</android.support.v7.widget.ContentFrameLayout>
<include
layout="@layout/app_bar_main2"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_main2"
app:menu="@menu/activity_main2_drawer" />
</android.support.v4.widget.DrawerLayout>
NewVisitFragment 中的代码也会自动生成：
package com.example.ddd;
import android.content.Context;
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 NewVisitFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link NewVisitFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class NewVisitFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public NewVisitFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment NewVisitFragment.
*/
// TODO: Rename and change types and number of parameters
public static NewVisitFragment newInstance(String param1, String param2) {
NewVisitFragment fragment = new NewVisitFragment();
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);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_new_visit, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
fragment_new_visit.xml 看起来像这样：
<?xml version="1.0" encoding="utf-8"?>
<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"
android:background="@color/colorPrimaryDark"
tools:context=".NewVisitFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
</FrameLayout>
这是Logcat:
09-24 11:07:44.160 13926-13926/? I/com.example.dd: Not late-enabling -Xcheck:jni (already on)
09-24 11:07:44.221 13926-13926/? W/com.example.dd: Unexpected CPU variant for X86 using defaults: x86
09-24 11:07:44.243 13926-13937/? E/com.example.dd: Failed to send jdwp-handshake response.: Broken pipe
09-24 11:07:44.284 13926-13926/? I/com.example.dd: The ClassLoaderContext is a special shared library.
09-24 11:07:44.378 13926-13926/? W/com.example.dd: JIT profile information will not be recorded: profile file does not exits.
09-24 11:07:44.381 13926-13926/? I/chatty: uid=10086(com.example.ddd) identical 10 lines
09-24 11:07:44.381 13926-13926/? W/com.example.dd: JIT profile information will not be recorded: profile file does not exits.
09-24 11:07:44.394 13926-13926/? I/InstantRun: starting instant run server: is main process
09-24 11:07:44.528 13926-13926/? W/com.example.dd: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (light greylist, reflection)
Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (light greylist, reflection)
09-24 11:07:44.632 13926-13926/? D/OpenGLRenderer: Skia GL Pipeline
09-24 11:07:44.684 13926-13951/? I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
09-24 11:07:44.685 13926-13951/? I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasHDRDisplay retrieved: 0
09-24 11:07:44.685 13926-13951/? I/OpenGLRenderer: Initialized EGL, version 1.4
09-24 11:07:44.685 13926-13951/? D/OpenGLRenderer: Swap behavior 1
09-24 11:07:44.686 13926-13951/? W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
09-24 11:07:44.686 13926-13951/? D/OpenGLRenderer: Swap behavior 0
09-24 11:07:44.695 13926-13951/? D/EGL_emulation: eglCreateContext: 0xe0085360: maj 3 min 1 rcv 4
09-24 11:07:44.765 13926-13951/? D/EGL_emulation: eglMakeCurrent: 0xe0085360: ver 3 1 (tinfo 0xe0083680)
09-24 11:07:44.767 13926-13951/? E/eglCodecCommon: glUtilsParamSize: unknow param 0x000082da
glUtilsParamSize: unknow param 0x000082da
09-24 11:07:44.841 13926-13951/? D/EGL_emulation: eglMakeCurrent: 0xe0085360: ver 3 1 (tinfo 0xe0083680)
09-24 11:07:44.973 13926-13926/? I/AssistStructure: Flattened final assist data: 3360 bytes, containing 1 windows, 11 views
如果您的上下文未实现特定接口，您将在 NewVisitFragment 的 onAttach() 方法中抛出 RuntimeException。但是您的 activity 没有实现 OnFragmentInteractionListener 接口。这就是为什么当您打开片段时，您的应用程序崩溃了。