Android Property Set android:nohistory= "true"

After setting android:nohistory= "true", the activity does not leave traces of history in the STATCK. The default value is False.

For example, suppose that there are three activity: a,b,c. These three activity can sequentially start the next activity, for example, a button in a, the user clicks to jump to B; Similarly, do a button in B and click Jump to C. c no longer does a button, just a demo shell activity.

The properties of configuration B in Androidmanifest.xml are: android:nohistory= "true"

The other two do not make special settings, only as a general activity processing.

It can be observed that after a is started, a jumps from a to B, then jumps from B to C, enters C, and if the return key is pressed, it will go directly to a, not to B. Simple Jump Logic route:

A–> b–> C–> Press the back key –> A

In conclusion, it is possible to understand the effect of android:nohistory= "true" on activity behavior: When the activity screen is not visible, it is equivalent to the finish () method of the Android system calling activity to end the activity.

Experiment Code:

A.java

1  Packagezhangphil.test;2 3 Importandroid.support.v7.app.ActionBarActivity;4 ImportAndroid.view.View;5 ImportAndroid.widget.Button;6 ImportAndroid.content.Context;7 Importandroid.content.Intent;8 ImportAndroid.os.Bundle;9 Ten  Public classAextendsactionbaractivity { One  A @Override -     protected voidonCreate (Bundle savedinstancestate) { -         Super. OnCreate (savedinstancestate); the  -Button Button =NewButton ( This); -Button.settext ("Click to jump to B"); -         FinalContext context = This; +Button.setonclicklistener (NewView.onclicklistener () { -  + @Override A              Public voidOnClick (View v) { atIntent Intent =NewIntent (context, B.class); - startactivity (intent); -             } -         }); -          - Setcontentview (button); in     } -}

B.java

1  Packagezhangphil.test;2 3 Importandroid.support.v7.app.ActionBarActivity;4 ImportAndroid.view.View;5 ImportAndroid.widget.Button;6 ImportAndroid.content.Context;7 Importandroid.content.Intent;8 ImportAndroid.os.Bundle;9 Ten /** One * android:nohistory= "true" A  *  -  * */ -  the  Public classBextendsactionbaractivity { -  - @Override -     protected voidonCreate (Bundle savedinstancestate) { +         Super. OnCreate (savedinstancestate); -          +Button Button =NewButton ( This); AButton.settext ("Click to jump to C"); at         FinalContext context = This; -Button.setonclicklistener (NewView.onclicklistener () { -  - @Override -              Public voidOnClick (View v) { -Intent Intent =NewIntent (context, C.class); in startactivity (intent); -             } to         }); +          - Setcontentview (button); the     } *}

C.java

1  Packagezhangphil.test;2 3 Importandroid.support.v7.app.ActionBarActivity;4 ImportAndroid.os.Bundle;5 6  Public classCextendsactionbaractivity {7 8 @Override9     protected voidonCreate (Bundle savedinstancestate) {Ten         Super. OnCreate (savedinstancestate); One     } A}

Androidmanifest.xml

1 <?XML version= "1.0" encoding= "Utf-8"?>2 <Manifestxmlns:android= "Http://schemas.android.com/apk/res/android"3  Package= "Zhangphil.test"4 Android:versioncode= "1"5 Android:versionname= "1.0" >6 7     <USES-SDK8         android:minsdkversion= "8"9 android:targetsdkversion= "All" />Ten  One     <Application A         Android:allowbackup= "true" - Android:icon= "@drawable/ic_launcher" - Android:label= "@string/app_name" the Android:theme= "@style/apptheme" > -         <Activity -              -             Android:name=". A " + Android:label= "A" > -             <Intent-filter> +                 <ActionAndroid:name= "Android.intent.action.MAIN" /> A  at                 <categoryAndroid:name= "Android.intent.category.LAUNCHER" /> -             </Intent-filter> -         </Activity> -          -         <Activity -             android:nohistory= "true" in              - Android:name=". B " to Android:label= "B" > +         </Activity> -          the          <Activity *             Android:name=". C " $ Android:label= "C" >Panax Notoginseng         </Activity> -          the     </Application> +  A </Manifest>

(Go) Android Property set android:nohistory= "true"