fragment, switching between and activity in Android

Function: Via a three button under activity, which is send message (Sendbutton), chat record (Chatbutton), common language (Commonbutton) . When the button is clicked, toggle the fragment above to display 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.

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

For the first question: in the Sendbutton Click event:

Private Onclicklistener Sendlistener = new Onclicklistener () {

@Override

public void OnClick (View v) {

TODO auto-generated Method Stub

gets The text control in Fragment1, which can be obtained directly from the control in the fragment in Mainactivity

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

get the content in EditText

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 in the intent for Easy access later in the fragment

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

Showview.settext (text);

}

};

For a second question:

affirm the Fragmentmanager object, and fragmenttransaction

Private Fragmentmanager Manager;

Private fragmenttransaction transaction;

methods to get two objects

Manager = Getsupportfragmentmanager ();

Transaction = Manager.begintransaction ();

You must first initialize a fragment toprevent the control in the corresponding fragment from being fetched

Fragment instantiated object to be loaded into mainactivity

Fragment_sendcontent f1 = new Fragment_sendcontent ();

The first parameter is the framelayout object in main_activity.xml

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 the sendlistener event:

place the obtained value in the intent for Easy access later in the fragment

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

In the Fragment.java of the history record :

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);

methods to get the controls in this fragment

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:

dynamic switching of fragment:

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 the use of simpleadapter and map<k,v>,arraylist<e>

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

For the first question:

Create a new XML file, plus a ListView .

<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 the control object in fragment

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

First parameter:

second parameter: is a list<e> parameter

Third parameter: Another layout file with a TextView control to display the information in each listview

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 to ArrayList , using key-value pairs

Public arraylist

arraylist

STRs = new string[]{

" child ", " Miss ", " Little Dong Wang ", " Jiangxi ", " Hello!" "

};

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 clicking each item is the event that is triggered

public class listener{

Public Onitemclicklistener ItemListener = new Onitemclicklistener () {

@Override

The third parameter represents the position of the item in the listView

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

Long Arg3) {

TODO auto-generated Method Stub

get the control object in mainactivity

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

String string = Strs[position];

Edittext.settext (string);

}

};

The above Click event can only occur in Onresume () and cannot be placed in Oncreatview ( )

@Override

public void Onresume () {

TODO auto-generated Method Stub

Super.onresume ();

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

}

fragment, switching between and activity in Android