内容提供者ContentProvider

 

1. 首先在需要提供内容提供者的应用中添加内容提供者的代码

    

2. package com.example.sqllite;

3.  

4. import com.example.sqllite.servise.DBOpenHelp;

5.  

6. import android.content.ContentProvider;

7. import android.content.ContentUris;

8. import android.content.ContentValues;

9. import android.content.UriMatcher;

10. import android.database.Cursor;

11. import android.database.sqlite.SQLiteDatabase;

12. import android.net.Uri;

13.  

14. public class personProvider extends ContentProvider {

15.  

16. private DBOpenHelp dbOpenHelp;

17. //Uri匹配器，检验是否匹配

18. private static final UriMatcher MATCHER=new UriMatcher(UriMatcher.NO_MATCH);

19. private static final int SUCCESS=1;

20. static {

21. MATCHER.addURI("com.contentProvide.providers.personProvides", "person", SUCCESS);

22. }

23.  

24. @Override

25. public boolean onCreate() {

26. dbOpenHelp=new DBOpenHelp(this.getContext());

27. return true;

28. }

29. @Override

30. public int delete(Uri uri, String selection, String[] selectionArgs) {

31. // TODO Auto-generated method stub

32. return 0;

33. }

34.  

35. @Override

36. public String getType(Uri uri) {

37. // TODO Auto-generated method stub

38. return null;

39. }

40.  

41. @Override

42. public Uri insert(Uri uri, ContentValues values) {

43. SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

44. switch (MATCHER.match(uri)) {

45. case SUCCESS:

46. long rowID=db.insert("person", "name", values);

47. //Uri insertUri=Uri.parse("content://com.contentProvide.providers.personProvides/person/"+rowID);

48. Uri insertUri=ContentUris.withAppendedId(uri, rowID);

49. db.close();

50. return insertUri;

51.  

52. default:

53. throw new IllegalArgumentException("未知的Uir");

54. }

55. }

56.  

57.  

58.  

59. @Override

60. public Cursor query(Uri uri, String[] projection, String selection,

61. String[] selectionArgs, String sortOrder) {

62. // TODO Auto-generated method stub

63. return null;

64. }

65.  

66. @Override

67. public int update(Uri uri, ContentValues values, String selection,

68. String[] selectionArgs) {

69. // TODO Auto-generated method stub

70. return 0;

71. }

72.  

73. }

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2.在原应用中添加配置项

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.sqllite"

    android:versionCode="1"

    android:versionName="1.0" >

 

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="18" />

 

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.sqllite.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>

        

        <!--  添加内容提供者的配置 -->

       <provider android:name=".personProvider" android:authorities="com.contentProvide.providers.personProvides"/>

    

    </application>

 

</manifest>

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3.新应用中进行访问

Uri uri=Uri.parse("content://com.contentProvide.providers.personProvides/person");

//访问contentProvider的帮助类

ContentResolver resolver=this.getApplicationContext().getContentResolver();

ContentValues values=new ContentValues();

values.put("name", "hahha");

values.put("age", 33);

values.put("amount", "123");

resolver.insert(uri, values);

 

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