fragment, switching between and activity in Android

Introduced:

feature Description: Through a Activity the three buttons below, respectively, are sending messages ( Sendbutton ), Chat history ( Chatbutton ), common language (Commonbutton) . When the button is clicked, toggle the fragmentabove todisplay different content.

Knowledge points used: When you click the Send Message button:

1. transfer The values from the EditText to the fragment from the mainactivity the.

2. How the fragment is dynamically displayed in the mainactivity.

for the first question: Sendbutton in the event of a click:

Private Onclicklistener Sendlistener = new Onclicklistener () {

@Override

public void OnClick (View v) {

TODO auto-generated Method Stub

// Get Fragment1 in the text Control , can be in mainactivity Direct Access in Fragment the controls in

TextView showview= (TextView) Findviewbyid (R.ID.SHOWTEXTVIEWID);

// Get EditText in the content

String message = Edittext.gettext (). toString ();

Getintent (). PutExtra ("str", message);

String temp = getintent (). Getstringextra ("str");

str = str.append (message). Append ("\ n");

String Text=null;

if (Str.length () >100) {

Text = str.substring (Str.length () -100, Str.length ()-1). ToString ();

}else {

Text = Str.tostring ();

}

// place the obtained value into the Intent to facilitate later Fragment obtained in

Getintent (). PutExtra ("Chatstr", str.tostring ());

Showview.settext (text);

}

};

For a second question:

// affirm Fragmentmanager objects, and fragmenttransaction

Private Fragmentmanager Manager;

Private fragmenttransaction transaction;

// methods to get two objects

Manager = Getsupportfragmentmanager ();

Transaction = Manager.begintransaction ();

// You must first initialize a Fragment To prevent access to the corresponding Fragment in the control

// will be loaded into the mainactivity Fragment instantiating an object

Fragment_sendcontent f1 = new Fragment_sendcontent ();

// The first parameter is Main_activity.xml in the Framelayout the Object

Transaction.add (r.id.framelayout_content, F1);

// add to the background stack

Transaction.addtobackstack (NULL);

// transaction must be committed

Transaction.commit ();

When you click the Chat log button: behavior: Gets all previous sent content.

The knowledge points used are:

1. How to get the data in mainactivity (the data you just sent is in an array in mainactivity)

2. switch from one fragment to another fragment .

For the first question:

First Look at Sendlistener in the event:

// place the obtained value into the Intent to facilitate later Fragment obtained in

Getintent (). PutExtra ("Chatstr", str.tostring ());

in the historical record of Fragment.java Medium:

Public View Oncreateview (layoutinflater inflater, ViewGroup container,

Bundle savedinstancestate) {

TODO auto-generated Method Stub

// load the corresponding Fragment , here is History_record

View Contentview = inflater.inflate (R.layout.history_record, NULL);

Contentview.setbackgroundcolor (Color.magenta);

// get this Fragment methods of the controls in

TextView = (TextView) Contentview.findviewbyid (R.ID.RECORDTEXTVIEWID);

// get the data in Mainactivity

String chatstring = getactivity (). Getintent (). Getstringextra ("Chatstr");

Textview.settext (chatstring);

return contentview;

}

For a second question:

Fragment The dynamic switching:

Private Onclicklistener Chatlistener = new Onclicklistener () {

@Override

public void OnClick (View v) {

TODO auto-generated Method Stub

Fragment_historyrecord Historyrecord = new Fragment_historyrecord ();

Transaction = Manager.begintransaction ();

Transaction.replace (R.id.framelayout_content, Historyrecord);

Transaction.addtobackstack (NULL);

Transaction.commit ();

}

};

When you click the Common use button: phenomenon: Pop up frequently used words (the most troublesome to achieve).

The knowledge points used are:

1. use the ListView control to display common language

2. How to place data in a ListView

3. familiar with simpleadapter,map<k,v>,arraylist<e> The use of mates between

4. switch from one fragment to another fragment . (Not repeat)

For the first question:

Create a new XML file, plus a ListView can be.

<listview

Android:id= "@+id/commonlanguageid"

Android:layout_width= "Match_parent"

android:layout_height= " 200dp" >

</ListView>

For a second question:

// Three global variables

Private ListView ListView;

Private string[] STRs;

Private EditText EditText;

Public View Oncreateview (layoutinflater inflater, ViewGroup container,

Bundle savedinstancestate) {

View Contentview = inflater.inflate (R.layout.fragment_listview, NULL);

// Get Fragment the control object in

ListView = (ListView) Contentview.findviewbyid (R.id.commonlanguageid);

// First parameter:

// The second parameter: is a list<e> Parameters

// the third parameter: Another layout file with a TextView control to display each bar ListView information in

// The fourth parameter:

// The fifth parameter:

Simpleadapter simpleadapter = new Simpleadapter (getactivity (). Getapplicationcontext (),

GetData (), R.layout.show_item, new string[]{"common"}, new Int[]{r.id.item});

Listview.setadapter (Simpleadapter);

return contentview;

}

// Add a Few common phrases that you have stated to ArrayList , use key-value pairs

Public arraylist

arraylist

STRs = new string[]{

" Children "," Miss "," Little Dong Wang "," Jiangxi "," Hi there! "

};

for (int i=0;i<strs.length;i++) {

hashmap<string, string> map = new hashmap<> ();

Map.put ("Common", strs[i]);

List.add (map);

}

return list;

}

// when you click each bar Item is the event that is triggered

public class listener{

Public Onitemclicklistener ItemListener = new Onitemclicklistener () {

@Override

// The third parameter is the one that gives Item in the ListView the location

public void Onitemclick (adapterview<?> arg0, View arg1, int position,

Long Arg3) {

TODO auto-generated Method Stub

// Get mainactivity the control object in

EditText = (editText) getactivity (). Findviewbyid (R.id.edittextid);

String string = Strs[position];

Edittext.settext (string);

}

};

// The above Click event can only occur in the Onresume () , cannot be placed in Oncreatview () in

@Override

Public void Onresume () {

TODO auto-generated Method Stub

Super.onresume ();

Listview.setonitemclicklistener (New Listener (). ItemListener);

}