ArrayAdapter adapter usage, simulating the QQ message sending interface ., Arrayadapter Adapter

ArrayAdapter adapter usage, simulating the QQ message sending interface ., Arrayadapter Adapter

1 import java. util. arrayList; 2 3 import android. app. activity; 4 import android. content. context; 5 import android. OS. bundle; 6 import android. view. layoutInflater; 7 import android. view. view; 8 import android. view. view. onClickListener; 9 import android. view. viewGroup; 10 import android. widget. arrayAdapter; 11 import android. widget. button; 12 import android. widget. editText; 13 import android. widget. listView; 14 import android. widget. textView; 15 16 public class MainActivity extends Activity {17 EditText et; 18 Button btn; 19 ListView lv; 20 MyAdapter mMyAdapter; 21 ArrayList <String> date; 22 23 @ Override24 protected void onCreate (Bundle savedInstanceState) {25 super. onCreate (savedInstanceState); 26 setContentView (R. layout. activity_main); 27 28 date = new ArrayList <String> (); 29 et = (EditText) findViewById (R. id. et1); 30 btn = (Button) findViewById (R. id. btn1); 31 lv = (ListView) findViewById (R. id. lv); 32 33 mMyAdapter = new MyAdapter (this, R. layout. list); 34 // set the ListView adapter (ArrayAdapter adapter usage) 35 lv. setAdapter (mMyAdapter); 36 37 btn. setOnClickListener (new OnClickListener () {38 39 @ Override40 public void onClick (View v) {41 sendmessage (); 42} 43}); 44} 45 46 public void sendmessage () {47 date. add (et. getText (). toString (); 48 mMyAdapter. notifyDataSetChanged (); 49 // The input box of the sent setting is null. 50 et. setText (null); 51 // scroll the ListView to the bottom 52 lv after the message is sent. setSelection (ListView. FOCUS_DOWN); 53} 54 55 public class MyAdapter extends ArrayAdapter {56 private Context context; 57 private int resource; 58 59 public MyAdapter (Context context, int resource) {60 super (context, resource); 61 this. resource = resource; 62 this. context = context; 63} 64 65 @ Override66 public int getCount () {67 68 return date. size (); 69} 70 71 @ Override72 public View getView (int position, View convertView, ViewGroup parent) {73 74 LayoutInflater flater = LayoutInflater. from (context); 75 // You can reuse view76 if (convertView = null) {77 convertView = flater. inflate (resource, null); 78} 79 TextView TV = (TextView) convertView. findViewById (R. id. qqtxt); 80 TV. setText (date. get (position); 81 82 return convertView; 83} 84 85} 86}

Xml file:

 1 <?xml version="1.0" encoding="utf-8"?> 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 3     android:id="@+id/RelativeLayout1" 4     android:layout_width="match_parent" 5     android:layout_height="match_parent" > 6  7     <ImageView 8         android:id="@+id/ImageView1" 9         android:layout_width="50dp"10         android:layout_height="50dp"11         android:layout_alignParentRight="true"12         android:layout_centerVertical="true"13         android:background="@drawable/meimei" />14 15     <TextView16         android:id="@+id/qqtxt"17         android:layout_width="wrap_content"18         android:layout_height="wrap_content"19         android:layout_centerVertical="true"20         android:layout_toLeftOf="@+id/ImageView1"21         android:background="#ff5252"22         android:text="1233"23         android:textSize="20sp" />24 25 </RelativeLayout>

1 <RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" 2 xmlns: tools = "http://schemas.android.com/tools" 3 android: layout_width = "match_parent" 4 android: layout_height = "match_parent" 5 tools: context = "com. lixu. qqduihua. mainActivity "> 6 7 <ListView 8 android: id =" @ + id/lv "9 android: layout_width =" match_parent "10 android: layout_height =" wrap_content "11 android: layout_above = "@ + id/commentLinearLayout" 12 android: layout_alignParentTop = "true" 13 android: divider = "@ android: color/transparent" 14 android: dividerHeight = "15dip" 15 android: scrollbars = "none"/> 16 17 <LinearLayout18 android: id = "@ + id/commentLinearLayout" 19 android: layout_width = "match_parent" 20 android: layout_height = "wrap_content" 21 android: layout_alignParentBottom = "true" 22 android: background = "# e0e0e0" 23 android: orientation = "horizontal"> 24 25 <EditText26 android: id = "@ + id/et1" 27 android: layout_width = "wrap_content" 28 android: layout_height = "wrap_content" 29 android: layout_weight = "2" 30 android: EMS = "10" 31 android: hint = "Enter content"> 32 33 <requestFocus/> 34 </EditText> 35 36 <Button37 android: id = "@ + id/btn1" 38 android: layout_width = "wrap_content" 39 android: layout_height = "wrap_content" 40 android: background = "@ drawable/round" 41 android: text = "send"/> 42 </LinearLayout> 43 44 </RelativeLayout>

Running effect: