上次打开的活动 [英] Last opened activity
本文介绍了上次打开的活动的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
启动时我的应用程序打开FirstActivity.
My application on boot opens FirstActivity.
从FirstActivity我可以开始:SecondActivity，ThirdActivity.当我按下主页"按钮然后返回到我的应用程序时，它将始终打开FirstActivity，而不是打开上一个活动(返回带有onCreate()的启动FirstActivity之后).
From FirstActivity I can start: SecondActivity, ThirdActivity. When I press the Home button and then return to my app, it always opens FirstActivity, rather than opening the last activity (after returning start FirstActivity with onCreate()).
如何恢复上一次活动的应用程序状态?
How I can restore application state on last activity?
在代码中，我不启动FirstActivity.
In code I don't start FirstActivity.
我的清单:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.bvblogic.nimbusnote"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17.0.0"
android:maxSdkVersion="19" />
<permission
android:name="com.bvblogic.nimbusnote.activities.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.bvblogic.nimbusnote.activities.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_TASKS"/>
<!--Permission for create shortcut on Home Screen-->
<uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT"></uses-permission>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:largeHeap="true"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:theme="@style/Theme.NimbusNote.Light"
android:hardwareAccelerated="true"
android:label="@string/app_name"
android:name=".application.App">
<activity
android:name=".activities.StartActivity"
android:theme="@style/Theme.Sherlock.Light.NoActionBar"
android:windowSoftInputMode="stateHidden"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.startactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.FolderListActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.folderlistactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.SettingsActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.settingsactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.ExplorerActivity"
android:label="@string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.exploreractivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".activities.PreviewNoteActivity"
android:windowSoftInputMode="adjustPan"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.previewnoteactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.VIEW_NOTE"></action>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.EditNoteActivity"
android:windowSoftInputMode="adjustResize"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.editnoteactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.NoteInfoActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.noteinfoactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.ChangePlaceMapActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.changeplacemapactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.PlacesActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.placesactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.ChangeTagsActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.changetagsactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.TagsActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.tagsactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
</activity>
<activity
android:name=".activities.PainterActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.painteractivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.AccountSettingsActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.accountsettingsactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.SyncSettingsActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.syncsettingsactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".activities.RecentNotesActivity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="com.bvblogic.nimbusnote.activities.recentnotesactivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<service android:name=".services.FullSyncService" />
<service android:name=".services.PrioritySyncService" />
</application>
</manifest>
更新: 比起我从ExplorerActivity启动PreviewNoteActivity并按Home按钮并从快捷方式打开应用程序，我返回到ExplorerActivity.但是按Back后，活动将关闭并显示PreviewNoteActivty.
UPDATE: Than I'm start PreviewNoteActivity from ExplorerActivity and press Home button and open application from shortcut I return to ExplorerActivity. But after press Back, activity is closed and show PreviewNoteActivty.
堆栈:
- ExplorerActivity
- PreviewNoteActivity
按Home键并返回到应用程序后:
After press Home and return to app:
- ExplorerActivity
- PreviewNoteActivity
- ExplorerActivity
，但应用重新启动后我没有启动ExplorerActivity. 如果应用程序启动后，我使用后退"按钮关闭了应用程序，则问题得到解决.但是在编译和首次启动之后，问题实际上是
but I don't start ExplorerActivity after app is restarted. If after app started and i close app with Back button problem is resolved. But after compile and first start problem is actually
更新2: 后退按钮侦听器
UPDATE 2: Back button listener
@Override
public void onBackPressed() {
if (mDrawerLayout.isDrawerVisible(mDrawerLeft)) {
closeNavigationDrawer();
} else if (!notesFragment.searchView.isIconified()) {
notesFragment.searchView.setQuery("", true);
notesFragment.searchView.setIconified(true);
notesFragment.searchView.clearFocus();
} else if (!mDrawerLayout.isDrawerVisible(mDrawerLeft)) {
ActivityManager actM = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> listm = actM.getRunningTasks(1);
int iNumActivity = listm.get(0).numActivities;
if (iNumActivity > 1) {
finish();
} else {
//close activity
closeAction();
}
}
}
private void closeAction() {
if (System.currentTimeMillis() - lastTimeBackPressed <= 2000) {
App.isExplorerActivityStarted = false;
finish();
} else {
lastTimeBackPressed = System.currentTimeMillis();
Toast.makeText(getApplicationContext(), "Press again for exit", Toast.LENGTH_SHORT).show();
}
}
Update3: 如果从apk文件(从sdcard)安装应用程序，则该问题很紧急.如果是从IDE(Android Studio)安装，则没有问题.
Update3: The problem is urgent if install application from apk file (from sdcard). If install from IDE (Android Studio) problem there is not.
推荐答案
我找到了解决方案: 这是Android系统错误.为了解决这个问题，我在下一个代码块的onCreate()方法中放入了根活动(首次启动):
I found solution: This is Android System bug. For resolve this problem i put in root Activity (first started) in onCreate() method next code block:
if (!isTaskRoot()) {
Intent intent = getIntent();
String action = intent.getAction();
if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) && action != null && action.equals(Intent.ACTION_MAIN)) {
finish();
return;
}
}
这篇关于上次打开的活动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！
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