android 让Activity单例运行

 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.go7j.sns" android:versionCode="1" 
    android:versionName="1.0"> 
    <application android:icon="@drawable/icon" 
        android:label="@string/app_name"> 
        <activity android:name=".MainActivity" 
            android:label="@string/app_name" 
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen" 
            android:launchMode="singleInstance"> 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 
                <category 
                    android:name="android.intent.category.DEFAULT" /> 
            </intent-filter> 
        </activity> 
    </application> 
    <uses-sdk android:minSdkVersion="7" /> 
</manifest> 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.go7j.sns" android:versionCode="1"
 android:versionName="1.0">
 <application android:icon="@drawable/icon"
  android:label="@string/app_name">
  <activity android:name=".MainActivity"
   android:label="@string/app_name"
   android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
   android:launchMode="singleInstance">
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category
     android:name="android.intent.category.DEFAULT" />
   </intent-filter>
  </activity>
 </application>
 <uses-sdk android:minSdkVersion="7" />
</manifest>

关键在activity中加入

android:launchMode="singleInstance"