008_03_ContentResolver

 Context提供了getContentResolver()方法，这表明Activity，service等组建都可以通过getContentResolver()方法获取对象。获取ContentResolver对象之后，接下来就可调用ContentResolver的query(),insert(),update(),delete()方法，实际上指定Uri对应的ContentProvider的query(),insert(),update(),delete()方法

 1 package com.example.day08_contentvisitor;
 2 
 3 import android.app.Activity;
 4 import android.content.ContentValues;
 5 import android.database.Cursor;
 6 import android.net.Uri;
 7 import android.os.Bundle;
 8 import android.util.Log;
 9 import android.view.Menu;
10 import android.view.MenuItem;
11 import android.view.View;
12 
13 public class MainActivity extends Activity {
14 
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19     }
20     
21     public void delete(View v){
22         getContentResolver().delete(Uri.parse("content://com.example.mycontentprovider"), "id=?", new String[]{"1"});
23     }
24     public void update(View v){
25         ContentValues c2 = new ContentValues();
26         c2.put("name", "zhaosi");
27         c2.put("telephone", "18888888888");
28         getContentResolver().update(Uri.parse("content://com.example.mycontentprovider"), c2, "id=?", new String[]{"4"});
29     }
30     public void insert(View v){
31         ContentValues c = new ContentValues();
32         c.put("id", 1);
33         c.put("name", "zhangsan");
34         c.put("telephone", "13899999999");
35         getContentResolver().insert(Uri.parse( "content://com.example.mycontentprovider"), c);
36     }
37     public void insert2(View v){
38         ContentValues c = new ContentValues();
39         c.put("id", 1);
40         c.put("name", "zhangsan");
41         c.put("wechat", "zhansanfeng");
42         
43         getContentResolver().insert(Uri.parse( "content://com.example.mycontentprovider/userwechat"), c);        
44     }
45     
46     public void query(View v){
47           Cursor c=    getContentResolver().query(Uri.parse( "content://com.example.mycontentprovider/userphonenum"),
48                     new String[]{"id","name" ,"telephone"}, null,null, null);
49         
50           while (c.moveToNext()) {
51               int id  = c.getInt(0);
52               String name = c.getString(1);
53               String number = c.getString(2);
54               
55               Log.i("mycontentvisitor", id+","+name+","+number);
56         }
57     }
58     
59     public void query2(View v){
60         
61           Cursor c=    getContentResolver().query(Uri.parse( "content://com.cskaoyan.mycontentprovider/userwechat/4"),
62                     new String[]{"id","name" ,"wechat"}, null,null, null);
63         
64           while (c.moveToNext()) {
65               int id  = c.getInt(0);
66               String name = c.getString(1);
67               String number = c.getString(2);
68               
69               Log.i("mycontentvisitor", id+","+name+","+number);
70         }
71     }
72     
73     public void query3(View v){
74         
75           Cursor c=    getContentResolver().query(Uri.parse( "content://com.cskaoyan.mycontentprovider/userwechat/wechat"),
76                     null, null,null, null);
77         
78           while (c.moveToNext()) {
79               String wechat  = c.getString(0);
80               Log.i("mycontentvisitor", wechat);
81           }
82             
83         }
84 }

 

 1 <LinearLayout 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     android:orientation="vertical"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.mycontentvisitor.MainActivity" >
11 
12     <TextView
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:text="@string/hello_world" />
16 
17     <Button
18         android:layout_width="fill_parent"
19         android:layout_height="wrap_content"
20         android:onClick="delete"
21         android:text="delete" />
22 
23     <Button
24         android:layout_width="fill_parent"
25         android:layout_height="wrap_content"
26         android:onClick="insert"
27         android:text="insert" />
28 
29     <Button
30         android:layout_width="fill_parent"
31         android:layout_height="wrap_content"
32         android:onClick="update"
33         android:text="update" />
34 
35     <Button
36         android:layout_width="fill_parent"
37         android:layout_height="wrap_content"
38         android:onClick="query"
39         android:text="query" />
40 
41     <Button
42         android:layout_width="fill_parent"
43         android:layout_height="wrap_content"
44         android:onClick="insert2"
45         android:text="insertinto wechat" />
46     
47     
48     <Button
49         android:layout_width="fill_parent"
50         android:layout_height="wrap_content"
51         android:onClick="query2"
52         android:text="query one from wechat" />
53 
54     
55     <Button
56         android:layout_width="fill_parent"
57         android:layout_height="wrap_content"
58         android:onClick="query3"
59         android:text="query name from wechat" />
60 </LinearLayout>
posted @ 2015-05-19 23:47  woodrow_woo  阅读(130)  评论(0)  编辑  收藏  举报