編輯:關於android開發
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 @Override 24 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 // 設置ListView的適配器 (ArrayAdapter適配器的用法) 35 lv.setAdapter(mMyAdapter); 36 37 btn.setOnClickListener(new OnClickListener() { 38 39 @Override 40 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 // 發送完設置輸入框為空 50 et.setText(null); 51 // 發送消息後將ListView滾動到最下方 52 lv.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 @Override 66 public int getCount() { 67 68 return date.size(); 69 } 70 71 @Override 72 public View getView(int position, View convertView, ViewGroup parent) { 73 74 LayoutInflater flater = LayoutInflater.from(context); 75 // 設置可以復用view 76 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文件:
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 <TextView 16 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 <LinearLayout 18 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 <EditText 26 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="請輸入內容" > 32 33 <requestFocus /> 34 </EditText> 35 36 <Button 37 android:id="@+id/btn1" 38 android:layout_width="wrap_content" 39 android:layout_height="wrap_content" 40 android:background="@drawable/round" 41 android:text="發送" /> 42 </LinearLayout> 43 44 </RelativeLayout>
運行效果:
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