android 让Activity单例运行

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<?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"