我在片段中工作，我需要从中选择一个图像 画廊并将其设置为imageView但 getActivity（）。startActivityForResult（）现在正在运行
我已经检查了许多链接但是所有人都说这个叫 父活动中的方法，但我没有任何父活动 片段在另一个片段内。我也检查了这个链接
startActivityForResult is not working in Fragment
这是我的代码： -
MainActivity类： -
public class SabaKuchHomeActivity extends FragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems=new ArrayList<NavDrawerItem>();
private NavDrawerListAdapter adapter;
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.home_activity);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1)));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
//getActionBar().setDisplayShowHomeEnabled(false);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
) {
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
//getActionBar().show();
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
//getActionBar().hide();
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_search:
Intent TrendIntent = new Intent(SabaKuchHomeActivity.this,TrendsActivity.class);
startActivity(TrendIntent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_search).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@SuppressLint("NewApi")
private void displayView(int position) {
// update the main content by replacing fragments
android.support.v4.app.Fragment fragment = null;
switch (position) {
case 0:
fragment = new OzoneFragment();
break;
case 1:
fragment = new MyZoneFragment();
break;
case 2:
fragment = new BizZoneFragment();
break;
case 3:
fragment = new EventsFragment();
break;
case 4:
fragment = new PrivacySettingFragment();
break;
case 5:
fragment = new ProfileSettingFragment(); ***This is the fragment where I am moving now***
break;
case 6:
AppContoller.getInstance().pref=getSharedPreferences(AppContoller.getInstance().PREF_NAME, 0);
Editor editer=AppContoller.getInstance().pref.edit();
editer.putString(AppContoller.getInstance().USER_ID, "0");
editer.commit();
finish();
break ;
default:
break;
}
if (fragment != null) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
}
这里是
ProfileSettingFragment()片段： -
@SuppressLint("NewApi")
public class ProfileSettingFragment extends android.support.v4.app.Fragment implements TabListener {
private ViewPager mPager;
private MyPageAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View rootView = inflater.inflate(R.layout.profile_setting_fragment, container, false);
mPager=(ViewPager)rootView.findViewById(R.id.pager);
mPager.setOffscreenPageLimit(5);
adapter=new MyPageAdapter(getChildFragmentManager());
mPager.setAdapter(adapter);
TabPageIndicator indicater=(TabPageIndicator)rootView.findViewById(R.id.indicator1);
indicater.setViewPager(mPager);
indicater.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
/*mPager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});*/
/*actionBar.addTab(actionBar.newTab().setText("Home").setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("MiZone").setTabListener(this));
actionBar.addTab(actionBar.newTab().setText("Top Trending").setTabListener(this));
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);*/
return rootView;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
private class MyPageAdapter extends FragmentStatePagerAdapter
{
private List<android.support.v4.app.Fragment> fragments;
public MyPageAdapter(FragmentManager fm) {
super(fm);
// TODO Auto-generated constructor stub
this.fragments=new ArrayList<android.support.v4.app.Fragment>();
fragments.add(new ProfileGeneralSetting());
fragments.add(new ProfileOzoneSetting());
fragments.add(new ProfileMyzoneSetting());
fragments.add(new ProfileBizzoneSetting());
fragments.add(new ProfilePasswordSetting());
}
@Override
public android.support.v4.app.Fragment getItem(int arg0) {
// TODO Auto-generated method stub
return fragments.get(arg0);
}
@Override
public CharSequence getPageTitle(int position) {
// TODO Auto-generated method stub
switch (position) {
case 0:
return "General";
case 1:
return "Ozone";
case 2:
return "MyZone";
case 3:
return "Biz Zone";
case 4 :
return "Password Setting";
}
return null;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return fragments.size();
}
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
mPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
这里是嵌套片段，我必须更改图像： -
public class ProfileOzoneSetting extends Fragment implements MiFeelingBase, OnClickListener{
NetworkImageView genSetOzoneUserImage;
private ArrayList<String>arrCategoryId=new ArrayList<String>();
List<String> interestList = new ArrayList<String>();
String[] interest;
Boolean setImg ;
private static final int SELECT_PICTURE = 1;
private String selectedImagePath;
Button SettingOzSave;
private MultipartEntity reqEntity;
String[] y ={""};
private String strUserID;
ImageLoader imageLoader = AppContoller.getInstance().getImageLoader();
OzoneSettingData ozSettingList = new OzoneSettingData();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// TODO Auto-generated method stub
View rootView = inflater.inflate(R.layout.profiesettingozone, container, false);
genSetOzoneUserImage = (NetworkImageView)rootView.findViewById(R.id.genSetOzoneUserImage);
SettingOzSave = (Button)rootView.findViewById(R.id.SettingOzSave);
SettingOzSave.setOnClickListener(this);
genSetOzoneUserImage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d("first time", "before method");
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
//startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE);
Log.d("first time", "before method11");
//startActivityForResult(intent, SELECT_PICTURE);
getParentFragment().startActivityForResult(intent, SELECT_PICTURE);
//startActivityForResult(intent, SELECT_PICTURE);
//((SabaKuchHomeActivity)getActivity()).startActivitForResult(intent, SELECT_PICTURE);
//getContext().getApplicationContext.startActivityforResult(intent, SELECT_PICTURE);
//fragment.getApplicationContext.startActivityforResult(intent, SELECT_PICTURE);
//getActivity().startActivityForResult(intent, SELECT_PICTURE);
//startActivityForResult(intent, SELECT_PICTURE);
//((SabaKuchHomeActivity)getActivity()).startActivitForResult(intent, SELECT_PICTURE);
Log.d("first time", "before method22");
}
});
APIAccess.fetchData(ProfileOzoneSetting.this, getActivity(), getActivity());
return rootView;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.d("first time", "before method33");
super.onActivityResult(requestCode, resultCode, data);
Log.d("first time", "before method44");
if (requestCode == SELECT_PICTURE && resultCode ==Activity.RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getActivity().getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
genSetOzoneUserImage.setImageBitmap(BitmapFactory.decodeFile(picturePath));
setImg = true;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
AppContoller.getInstance().pref=getActivity().getSharedPreferences(AppContoller.getInstance().PREF_NAME, 0);
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = getActivity().managedQuery(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
请让我知道我在这里犯了什么错误???
更新
我确实更新了SabaKuchHomeActivity和ProfileSettingFragment
答案 0 :(得分：9)
问题是你在Fragment中实现 onActivityResult 并调用 getActivity（）。startActivityForResult（...）。因为您要从Activity启动Activity，所以 onActivityResult（...）方法调用将转到启动新Activity的Activity。
所以您需要做的就是删除 getActivity（）部分，并在您的片段中调用onActivityResult（...）！
编辑： 正如您在GrepCode中看到的那样，Fragment startActivityForResult 中的代码与Activity startActivityForResult 不同。这肯定是巧合......
答案 1 :(得分：6)
你不应该使用
getActivity().startActivityForResult(...)
只需使用
startActivityForResult(...)
这样就可以调用片段中的onActivityResult。
答案 2 :(得分：1)
尝试一下， 当您调用startActivityForResult（）时，首先调用Activity的onActivityResult（），然后调用其片段的onActivityResult（），但不会对嵌套片段进行此调用。因此，在你的片段的onActivityResult（）中，你必须以某种方式获取当前加载的片段，如果需要则对其进行类型转换，然后调用一个写在其中的方法，你传递给OnActivityResult（）。
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// notifying nested fragments (support library bug fix)
final FragmentManager childFragmentManager = getChildFragmentManager();
if (childFragmentManager != null) {
final List < Fragment > nestedFragments = childFragmentManager.getFragments();
if (nestedFragments == null || nestedFragments.size() == 0) return;
for (Fragment childFragment: nestedFragments) {
if (childFragment != null && !childFragment.isDetached() && !childFragment.isRemoving()) {
childFragment.onActivityResult(requestCode, resultCode, data);
}
}
}
}
片段中的代码onActivityResult（）看起来像， 尝试从fragmentManager或viewPagerAdapter的帮助中获取片段 还尝试将startActivityForResult称为
fragment.getParentFragment().startActivityForResult();
而不是
fragment.startActivityForResult();
将它放在外部片段中以访问当前加载的片段
MyFragment myFragment = (MyFragment)pagerAdapter.getCurrentFragment();
myFragment.myMethod();
以下代码中的代码将返回当前加载的片段，请记住以下内容仅供您理解，相应地在代码中使用
Fragment fragment;
@Override
public Fragment getItem(int index) {
fragment = new FragFilter();
return fragment;
}
public Fragment getCurrentFragment() {
return this.fragment;
}
答案 3 :(得分：1)
删除
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
在您的活动和第一个片段中并在嵌套片段中维护它
并且即使没有工作也会在将片段初始化为
时传递您的活动实例fragment = new ProfileSettingFragment(activity);
并在片段中创建一个与活动实例一起使用的构造函数 那么你可以在主要活动中调用onActivityResult，并且可以在初始化片段时传递活动参考来获取该活动的数据。
您可以创建一个界面，其中有一个方法将返回一个字符串，通过在您的活动中实现该字符串，您可以通过您的活动参考可用的位置接收数据。
答案 4 :(得分：0)
出于某些原因从
启动ActivityForResultandroid.support.v4.app.Fragment
不会工作，它将转到您的活动onActivityResult。如果你使用
android.app.Fragment
它将起作用并返回到Fragment中的onActivityResult。
答案 5 :(得分：0)
虽然我没有测试你的代码。 我代表我写这个答案。
getActivity.startActivityForResult(...)
应该调用Activity onActivityResult。
getParentFragment().onActivityResult(...)
应调用父片段中的onActivityResult。
并且
this.onActivityResult(...)
应该调用当前片段onActivityResult（）方法。
您可以尝试这里提到的这些关键字。如果您仍然遇到问题，请告诉我我在GIT上的代码示例
答案 6 :(得分：0)
试试这个：
getContext().getApplicationContext.startActivityforResult();
答案 7 :(得分：0)
在onActivityResult使用
SabaKuchHomeActivity
public void dispatchTakePictureIntent() {
final int TAKE_PHOTO_RESULT_CODE = 2345;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent
.resolveActivity(getActivity().getPackageManager()) != null)
if (getParentFragment() != null)
getParentFragment().startActivityForResult(takePictureIntent, TAKE_PHOTO_RESULT_CODE);
else
startActivityForResult(takePictureIntent, TAKE_PHOTO_RESULT_CODE);
}
public void dispatchChoosePictureIntent() {
final int CHOOSE_PHOTO_RESULT_CODE = 1234;
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
if (getParentFragment() != null)
getParentFragment().startActivityForResult(Intent.createChooser(intent, "Choose Picture"),
CHOOSE_PHOTO_RESULT_CODE);
else
startActivityForResult(Intent.createChooser(intent, "Choose Picture"),
CHOOSE_PHOTO_RESULT_CODE);
}
如果您使用自定义片段或/和viewpager，请使用getParentFragment（），否则使用igonre / remove getParentFragment（）
答案 8 :(得分：0)
简单的解决方案只需调用startActivityForResult(/* … */)，然后调用片段中的onActivityResult(/* … */)。我经常使用它。
答案 9 :(得分：0)
我们也可以在你的片段中实现onActivityResult()。
亲爱的代码，只需从getActivity.移除getActivity.startActivityForResult(...)，然后它就会调用您片段的onActivityResult()。
有关详细信息，请参阅此link。
享受你的代码：）
答案 10 :(得分：0)
它变成了一个更长的代码，我将做一个简短的演练 - （因为它是一个赏金），这就是全部。这是我使用的xml。其余的java
<强> activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res/rumorsapp.ghaweek"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="rumorsapp.ghaweek.MainActivity" >
<android.support.design.widget.TabLayout
android:id="@+id/tablayou"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="#ff9900"
android:minHeight="50dp"
app:tabIndicatorColor="#f09"
app:tabMode="scrollable"
app:tabPadding="10dp"
app:tabSelectedTextColor="#004"
app:tabTextColor="#fff" >
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_marginTop="2dp"
android:layout_below="@+id/tablayou"
android:layout_height="match_parent"/>
</RelativeLayout>
我所做的就是创建一个名为 interface 的ActivityResHan，其中只有一个名为initiate(String fragmentTag);的方法（我的名字很差-i know ）逻辑是让我的直接Fragment - （包含viewpager的片段或者有孩子的孩子）实现这个ActivityResHan { {1}}
interface将调用class ViewPagerFragment extends Fragment implements ActivityResHan{
从内容提供商处检索联系人。
startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST);此@Override
public void initiate(String fragmentTag) {
calleer = fragmentTag; //this calleer saves the tag
Intent pickContactIntent = new Intent(Intent.ACTION_PICK, Uri.parse("content://contacts"));
pickContactIntent.setType(Phone.CONTENT_TYPE);
startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST);
}
direct-Fragment检查onActivityResult是否为空 - （我希望您已经遇到过calleer ）如果不是，那么它会调用{ {1}}为他/她的孩子，并通过calleer，onActivityResult Tag来识别其子女
现在FragmentManager.findFragmentByTag();的每个孩子，当需要为结果启动活动时，只需找到calleer direct-Fragment - （ viewpageframent ）和然后将direct-Fragment投射到Tag并调用Fragment
ActivityResHan其余代码使这一切都发生。
initiate(fragmentTag);希望它有所帮助。
答案 11 :(得分：0)
In Kotlin
In Activity :-
private var fragment: Fragment? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.fragment_activity)
fragment = Fragment()
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
fragment?.onActivityResult(requestCode, resultCode, data)
}
In Fragment :-
button.setOnClickListener {
activity?.startActivityForResult(Intent(parentActivity,
SecondActivity::class.java), REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
val string = data?.getStringExtra("SELECTED_NAME")
Log.e("Name", "$string")
}
In SecondActivity :-
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
android.R.id.home -> finish()
R.id.action_filter_apply -> {
val intent = Intent()
intent.putExtra("SELECTED_NAME", "Android")
setResult(Activity.RESULT_OK, intent)
finish()
}
}
return super.onOptionsItemSelected(item)
}
答案 12 :(得分：-1)
在你的片段中覆盖此方法
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
并将activity变量存储为您的类的成员。 这样，您将始终获得系统提供的正确活动。