Content provider



package czmec.cn.net.lh;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.util.Log;
import android.view.Menu;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
 List<Map<String,Object>> list =new ArrayList<Map<String,Object>>();
 Map<String,Object> map = null;
 SimpleAdapter simple =null;
 ListView listview =null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listview= (ListView) findViewById(R.id.lv_show);    
      //读取contentprovider 数据
      ContentResolver resolver = this.getContentResolver();    
      Uri uri = Uri.parse("content://com.mxy.MyProvider/query");
      Cursor cursor = resolver.query(uri, null,null ,null, null);
      Log.i("info", uri.toString());
      while(cursor != null && cursor.moveToNext()){
       int id = cursor.getInt(cursor.getColumnIndex("id"));
       String name = cursor.getString(1);
       String number = cursor.getString(2);
       Log.i("info", "id:" + id + "姓名：" + name +  "  学号:" + number);
       map = new HashMap<String, Object>();
       map.put("id", id);
       map.put("name", name);
       map.put("number", number);
       list.add(map);
      }
      simple = new SimpleAdapter(getApplicationContext(), list, R.layout.simplelist,
        new String[]{"id","name","number"},new int[]{R.id.id,R.id.name,R.id.number} );
      listview.setAdapter(simple);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
   
}

activit-main:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/lv_show"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

simplelist.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <TextView
        android:id="@+id/number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

mainifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="czmec.cn.net.lh"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="czmec.cn.net.lh.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>