自定义ContentProvider 实例演示

本是古典何须时尚 2022-06-09 00:26 235阅读 0赞

参考：contentprovider的学习实例总结  [http://www.cnblogs.com/chenglong/articles/1892029.html][http_www.cnblogs.com_chenglong_articles_1892029.html]  
Android学习十九：ContentProvider初步  [http://blog.sina.com.cn/s/blog\_5688414b0100xagp.html][http_blog.sina.com.cn_s_blog_5688414b0100xagp.html]  
android 自定义 Content Provider示例  [http://byandby.iteye.com/blog/837466][http_byandby.iteye.com_blog_837466]

**实例源码下载：[http://download.csdn.net/detail/yang\_hui1986527/4430639][http_download.csdn.net_detail_yang_hui1986527_4430639]**

Profile.java

package com.snowdream.contentprovider;
    
    import android.net.Uri;
    
    public class Profile {
    	
    	/**
    	 * 表格名称
    	 */
    	public static final String TABLE_NAME = "profile";
    	
    	/**
    	 * 列表一，_ID，自动增加
    	 */
    	public static final String COLUMN_ID = "_id";
    	
    	/**
    	 * 列表二，名称
    	 */
    	public static final String COLUMN_NAME = "name";
         
         
        public static final String AUTOHORITY = "com.snowdream.provider";
        public static final int ITEM = 1;
        public static final int ITEM_ID = 2;
         
        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.snowdream.profile";
        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.snowdream.profile";
         
        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTOHORITY + "/profile");
    }

DBHelper.java

package com.snowdream.contentprovider;
    
    import android.content.Context;
    import android.database.SQLException;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteOpenHelper;
    
    public class DBHelper extends SQLiteOpenHelper {
    
    	/**
    	 * 数据库名称
    	 */
    	private static final String DATABASE_NAME = "test.db";  
    	
    	/**
    	 * 数据库版本
    	 */
    	private static final int DATABASE_VERSION = 1;  
    
    	public DBHelper(Context context) {
    		super(context, DATABASE_NAME, null, DATABASE_VERSION);
    	}
    
    	@Override
    	public void onCreate(SQLiteDatabase db)  throws SQLException {
    		//创建表格
    		db.execSQL("CREATE TABLE IF NOT EXISTS "+ Profile.TABLE_NAME + "("+ Profile.COLUMN_ID +" INTEGER PRIMARY KEY AUTOINCREMENT," + Profile.COLUMN_NAME +" VARCHAR NOT NULL);");
    	}
    
    	@Override
    	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)  throws SQLException {
    		//删除并创建表格
    		db.execSQL("DROP TABLE IF EXISTS "+ Profile.TABLE_NAME+";");
    		onCreate(db);
    	}
    }

MyProvider.java

package com.snowdream.contentprovider;
    
    import android.content.ContentProvider;
    import android.content.ContentUris;
    import android.content.ContentValues;
    import android.content.UriMatcher;
    import android.database.Cursor;
    import android.database.SQLException;
    import android.database.sqlite.SQLiteDatabase;
    import android.net.Uri;
    
    public class MyProvider extends ContentProvider {
    
    	DBHelper mDbHelper = null;
    	SQLiteDatabase db = null;
    
    	private static final UriMatcher mMatcher;
    	static{
    		mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    		mMatcher.addURI(Profile.AUTOHORITY,Profile.TABLE_NAME, Profile.ITEM);
    		mMatcher.addURI(Profile.AUTOHORITY, Profile.TABLE_NAME+"/#", Profile.ITEM_ID);
    	}
    
    	@Override
    	public int delete(Uri uri, String selection, String[] selectionArgs) {
    		// TODO Auto-generated method stub
    		return 0;
    	}
    
    	@Override
    	public String getType(Uri uri) {
    		switch (mMatcher.match(uri)) {
    		case Profile.ITEM:
    			return Profile.CONTENT_TYPE;
    		case Profile.ITEM_ID:
    			return Profile.CONTENT_ITEM_TYPE;
    		default:
    			throw new IllegalArgumentException("Unknown URI"+uri);
    		}
    	}
    
    	@Override
    	public Uri insert(Uri uri, ContentValues values) {
    		// TODO Auto-generated method stub
    		long rowId;
    		if(mMatcher.match(uri)!=Profile.ITEM){
    			throw new IllegalArgumentException("Unknown URI"+uri);
    		}
    		rowId = db.insert(Profile.TABLE_NAME,null,values);
    		if(rowId>0){
    			Uri noteUri=ContentUris.withAppendedId(Profile.CONTENT_URI, rowId);
    			getContext().getContentResolver().notifyChange(noteUri, null);
    			return noteUri;
    		}
    
    		throw new SQLException("Failed to insert row into " + uri);
    	}
    
    	@Override
    	public boolean onCreate() {
    		// TODO Auto-generated method stub
    		mDbHelper = new DBHelper(getContext());
    
    		db = mDbHelper.getReadableDatabase();
    
    		return true;
    	}
    
    	@Override
    	public Cursor query(Uri uri, String[] projection, String selection,
    			String[] selectionArgs, String sortOrder) {
    		// TODO Auto-generated method stub
    		Cursor c = null;
    		switch (mMatcher.match(uri)) {
    		case Profile.ITEM:
    			c =  db.query(Profile.TABLE_NAME, projection, selection, selectionArgs, null, null, sortOrder);
    			break;
    		case Profile.ITEM_ID:
    			c = db.query(Profile.TABLE_NAME, projection,Profile.COLUMN_ID + "="+uri.getLastPathSegment(), selectionArgs, null, null, sortOrder);
    			break;
    		default:
    			throw new IllegalArgumentException("Unknown URI"+uri);
    		}
    
    		c.setNotificationUri(getContext().getContentResolver(), uri);
    		return c;
    	}
    
    	@Override
    	public int update(Uri uri, ContentValues values, String selection,
    			String[] selectionArgs) {
    		// TODO Auto-generated method stub
    		return 0;
    	}
    
    }

MainActivity.java

package com.snowdream.contentprovider;
    
    import com.snowdream.contentprovider.R;
    
    import android.app.ListActivity;
    import android.content.ContentResolver;
    import android.content.ContentUris;
    import android.content.ContentValues;
    import android.database.Cursor;
    import android.database.SQLException;
    import android.database.sqlite.SQLiteDatabase;
    import android.net.Uri;
    import android.os.Bundle;
    import android.view.Menu;
    import android.widget.SimpleCursorAdapter;
    
    
    public class MainActivity extends ListActivity {
    	private SimpleCursorAdapter adapter= null;
    	private Cursor mCursor = null;
    	private ContentResolver mContentResolver = null;
    
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		initData();
    		initAdapter();
    	}
    
    	public void initData(){
    		mContentResolver = getContentResolver();
    
    		//填充数据
    		for (int i = 0; i < 100; i++) {
    			ContentValues values = new ContentValues();
    			values.put(Profile.COLUMN_NAME, "张三"+i);
    			mContentResolver.insert(Profile.CONTENT_URI, values);
    		}
    	}
    
    
    	public void initAdapter(){
    		//查询表格，并获得Cursor
    		//查询全部数据
    		mCursor = mContentResolver.query(Profile.CONTENT_URI, new String[]{Profile.COLUMN_ID,Profile.COLUMN_NAME}, null, null, null);
    
    		//查询部分数据
    		//String selection = Profile.COLUMN_ID + " LIKE '%1'";
    		//mCursor = mContentResolver.query(Profile.CONTENT_URI, new String[]{Profile.COLUMN_ID,Profile.COLUMN_NAME}, selection, null, null);
    
    
    		//查询一个数据
    		//Uri uri = ContentUris.withAppendedId(Profile.CONTENT_URI, 50);
    		//mCursor = mContentResolver.query(uri, new String[]{Profile.COLUMN_ID,Profile.COLUMN_NAME}, null, null, null);
    
    		startManagingCursor(mCursor);
    
    		//设置adapter
    		adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, mCursor, new String[]{Profile.COLUMN_ID,Profile.COLUMN_NAME}, new int[]{android.R.id.text1,android.R.id.text2});
    		setListAdapter(adapter);
    	}
    
    
    	@Override
    	public boolean onCreateOptionsMenu(Menu menu) {
    		getMenuInflater().inflate(R.menu.activity_main, menu);
    		return true;
    	}
    
    
    }

预览效果：

![1342363958_4300.png][]

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[http_www.cnblogs.com_chenglong_articles_1892029.html]: http://www.cnblogs.com/chenglong/articles/1892029.html
[http_blog.sina.com.cn_s_blog_5688414b0100xagp.html]: http://blog.sina.com.cn/s/blog_5688414b0100xagp.html
[http_byandby.iteye.com_blog_837466]: http://byandby.iteye.com/blog/837466
[http_download.csdn.net_detail_yang_hui1986527_4430639]: http://download.csdn.net/detail/yang_hui1986527/4430639
[1342363958_4300.png]: https://img-my.csdn.net/uploads/201207/15/1342363958_4300.png
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[Center]: /images/20220609/9230202cc8704b2ea312114566de424c.png