02Android User Interface Optimization (i) Android Fragment

I. Use of Fragment1.AndroidManifest.xml files

 <?xml version= "1.0" encoding= "Utf-8"? 
 <manifest xmlns:android= "http://schemas.android.com/apk/ Res/android "
 package=" com.example.shiyanshi.learningfragment "; 
 
 <application 
 Android:all Owbackup= "true" 
 android:icon= "@mipmap/ic_launcher" 
 android:label= "@string/app_name" 
 Andro Id:supportsrtl= "true" 
 Android:theme= "@style/apptheme"; 
 <activity 
 Android:name= " . Mainactivity "
 android:label=" @string/app_name "
 android:theme=" @style/apptheme.noactionbar "&G T 
 <intent-filter> 
 <action android:name= "Android.intent.action.MAIN"/> 
 
 <category android:name= "Android.intent.category.LAUNCHER"/> 
 </intent-filter>< br> </activity> 
 </application> 
 
 </manifest> 

2. layout file (1) activity_main.xml the layout container where a frame layout is placed, with an ID of container

<?xml version= "1.0" encoding= "Utf-8"?>
<framelayout xmlns:android= "Http://schemas.android.com/apk/res/android"
    Android:layout_width= "Match_parent" android:layout_height= "Match_parent"
    Android:id= "@+id/container" >
</FrameLayout>

(2) Fragment_main.xml main fargment layout file, the button placed inside to pop up another fragment

<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Xmlns:tools= "Http://schemas.android.com/tools"
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent"
android:paddingbottom= "@dimen/activity_vertical_margin"
android:paddingleft= "@dimen/activity_horizontal_margin"
android:paddingright= "@dimen/activity_horizontal_margin"
android:paddingtop= "@dimen/activity_vertical_margin"
android:orientation= "Vertical"
tools:context= "Com.example.shiyanshi.learningfragment.MainActivityFragment"
tools:showin= "@layout/activity_main" >

<textview
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:text= "Beijing welcomes you!"/>

<button
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:id= "@+id/btnshowfragmentanother"
Android:text= "show Another Fragment"/>

</LinearLayout>

(3) Fragment_another.xml from fragment layout file, the inside button is used to support back to the previous fragment interface

<?xml version= "1.0" encoding= "Utf-8"?>
<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
    android:orientation= "vertical" android:layout_width= "match_parent"
    android:layout_height= "Match_parent"
    Android:id= "@+id/fragmentanother" >


    <textview
        Android:layout_width= "Wrap_content"
        android:layout_height= "Wrap_content"
        Android:text= "This is another fragment"/>

    <button
        Android:layout_width= "Wrap_content"
        android:layout_height= "Wrap_content"
        Android:id= "@+id/btnbackoperation"
        android:text= "Back operation"/>

</LinearLayout>

3.Java source Files (1) Mainactivity.java

Package com.example.shiyanshi.learningfragment;

Import Android.os.Bundle;
Import Android.support.design.widget.FloatingActionButton;
Import Android.support.design.widget.Snackbar;
Import android.support.v7.app.AppCompatActivity;
Import Android.support.v7.widget.Toolbar;
Import Android.view.View;
Import Android.view.Menu;
Import Android.view.MenuItem;

public class Mainactivity extends Appcompatactivity {

    @Override
    protected void OnCreate (Bundle savedinstancestate) {
        Super.oncreate (savedinstancestate);
        Setcontentview (R.layout.activity_main);

      

if (savedinstancestate==null) {
Getsupportfragmentmanager ()
. BeginTransaction ()
The first parameter of the. Add (r.id.container,new mainactivityfragment ())//add is the layout container, and the second parameter is the class of the primary fragment
. commit ();
}

    }


}

(2) Mainactivityfragment.java

Package com.example.shiyanshi.learningfragment;

Import android.support.v4.app.Fragment;

Import Android.os.Bundle;
Import Android.view.LayoutInflater;
Import Android.view.View;
Import Android.view.ViewGroup;

/**
* A placeholder fragment containing a simple view.
*/

Fragment

{      //Note that its inheritance is

Import Android.support.v4.app.Fragment

Fragment in the

    Public Mainactivityfragment () {
    }

    @Override
    Public View Oncreateview (layoutinflater inflater, ViewGroup container,
                             Bundle savedinstancestate) {

      

View rootview=inflater.inflate (R.layout.fragment_main, container, false);//First parameter: Layout file for main fragment, second: Layout container, The third is a Boolean type Attachtoroot

Rootview.findviewbyid (R.id.btnshowfragmentanother). Setonclicklistener (New View.onclicklistener () {
@Override
public void OnClick (View v) {
Getfragmentmanager (). BeginTransaction ()
. Addtobackstack (NULL)//Add back stack to enable it to support backward function
. replace (r.id.container,new anotherfragment ())
. commit ();
}
});

        return rootview;
    }
}

(3) Anotherfragment.java

Package com.example.shiyanshi.learningfragment;

Import Android.os.Bundle;
Import android.support.annotation.Nullable;
Import android.support.v4.app.Fragment;
Import Android.view.LayoutInflater;
Import Android.view.View;
Import Android.view.ViewGroup;

/**
* Created by Shiyanshi on 2016/1/25.
*/

Fragment

{
    @Nullable
    @Override
    Public View Oncreateview (final layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) {
        

View view = Inflater.inflate (R.layout.fragment_another,container,false);

View.findviewbyid (r.id.btnbackoperation). Setonclicklistener (New View.onclicklistener () {
@Override
public void OnClick (View v) {
Getfragmentmanager (). Popbackstack ();
}
});

        return view;
    }
}

4. Interface Display effect

Second, the life cycle of fragment

02Android User Interface Optimization (i) Android Fragment