Android内容提供者 基础代码

1、内容提供者代码

package com.pas.sqlite.db;

import com.pas.sqllitehelper.PersonSQLiteOpenHelper;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;

public class PersonDBProvider extends ContentProvider
{

	/*
	 * uri匹配器用于匹配uri,条件不满足返回-1
	 */
	private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
	private static final int INSERT = 1;
	private static final int DELETE = 2;
	private static final int UPDATE = 3;
	private static final int QUERY = 4;

	private PersonSQLiteOpenHelper helper;
	static
	{
		matcher.addURI("com.pas.sqlite.personprovider", "insert", INSERT);
		matcher.addURI("com.pas.sqlite.personprovider", "delete", DELETE);
		matcher.addURI("com.pas.sqlite.personprovider", "update", UPDATE);
		matcher.addURI("com.pas.sqlite.personprovider", "query", QUERY);
	}

	@Override
	public boolean onCreate()
	{
		helper = new PersonSQLiteOpenHelper(getContext());
		return false;
	}

	@Override
	public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
	{
		if (matcher.match(uri) == QUERY)
		{
			// 返回查询结果集合
			SQLiteDatabase db = helper.getReadableDatabase();
			Cursor cursor = db.query("persons", projection, selection, selectionArgs, null, null, sortOrder);
			return cursor;
		} else
		{
			throw new IllegalArgumentException("路径不合法,无法执行查询操作");
		}
	}

	@Override
	public String getType(Uri uri)
	{
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Uri insert(Uri uri, ContentValues values)
	{
		if (matcher.match(uri) == INSERT)
		{
			SQLiteDatabase db = helper.getReadableDatabase();
			db.insert("persons", null, values);
		} else
		{
			throw new IllegalArgumentException("路径不合法,无法执行插入操作");
		}
		return null;
	}

	@Override
	public int delete(Uri uri, String selection, String[] selectionArgs)
	{
		if (matcher.match(uri) == DELETE)
		{
			SQLiteDatabase db = helper.getReadableDatabase();
			return db.delete("persons", selection, selectionArgs);
		} else
		{
			throw new IllegalArgumentException("路径不合法,无法执行删除操作");
		}
	}

	@Override
	public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs)
	{
		if (matcher.match(uri) == UPDATE)
		{
			SQLiteDatabase db = helper.getReadableDatabase();
			return db.update("persons",values,selection,selectionArgs);
		} else
		{
			throw new IllegalArgumentException("路径不合法,无法执行更新操作");
		}
	}

}

2、外部程序使用提供者代码

package com.example.providerreader;

import java.sql.Array;
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.content.ContentValues;
import android.database.Cursor;
import android.view.Menu;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity
{

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	@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;
	}

	public void del(View view)
	{
		ContentResolver resolver = getContentResolver();
		Uri uri = Uri.parse("content://com.pas.sqlite.personprovider/delete");
		if (1 == resolver.delete(uri, "id=?", new String[]
		{ "487" }))
		{
			Toast.makeText(this, "删除487成功", Toast.LENGTH_SHORT).show();
		}
	}

	public void update(View view)
	{
		ContentResolver resolver = getContentResolver();
		Uri uri = Uri.parse("content://com.pas.sqlite.personprovider/update");
		ContentValues values = new ContentValues();
		values.put("name", "王刚");
		if (1 == resolver.update(uri, values, "id=?", new String[]
		{ "487" }))
		{
			Toast.makeText(this, "更新487成功", Toast.LENGTH_SHORT).show();
		}
	}

	public void insert(View view)
	{
		ContentResolver resolver = getContentResolver();
		Uri uri = Uri.parse("content://com.pas.sqlite.personprovider/insert");

		ContentValues values = new ContentValues();
		values.put("name", "策划");
		values.put("number", "110");
		values.put("account", "12121");

		resolver.insert(uri, values);

		Toast.makeText(this, "增加策划成功", Toast.LENGTH_SHORT).show();

	}

	public void click(View view)
	{
		ListView lv = (ListView) findViewById(R.id.lv);
		lv.setAdapter(new SimpleAdapter(this, getList(), R.layout.listitem, new String[]
		{ "id", "name" }, new int[]
		{ R.id.ID, R.id.Name }));

	}

	private List<Map<String, Object>> getList()
	{
		ArrayList<Map<String, Object>> data = new ArrayList<Map<String, Object>>();

		// 手机的中间人
		ContentResolver resolver = getContentResolver();
		Uri uri = Uri.parse("content://com.pas.sqlite.personprovider/query");
		Cursor cursor = resolver.query(uri, null, null, null, null);
		while (cursor.moveToNext())
		{
			Map<String, Object> map = new HashMap<String, Object>();
			String name = cursor.getString(cursor.getColumnIndex("name"));
			String id = cursor.getString(cursor.getColumnIndex("id"));
			map.put("id", id);
			map.put("name", name);
			data.add(map);
		}
		return data;
	}
}