ContentProvider再学习:注册观察者

最新推荐文章于 2023-03-28 17:18:40 发布

原创最新推荐文章于 2023-03-28 17:18:40 发布 · 672 阅读

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package cn.itcast.db.provider;

import cn.itcast.db.MyDBOpenHelper;
import cn.itcast.db.dao.PersonDBDao;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.util.Log;

public class PersonProvider extends ContentProvider {
	// 创建了一个路径的识别器 uriMatcher 默认的返回值,如果没有找到匹配的类型  返回 -1;
	public static final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
	public static final int ALL_PERSONS = 1;
	public static final int PERSON = 2;
	public static final int HAHA =3;
	public static final int INSERT =4;
	public static final int DELETE =5;
	public static final int UPDATE =6;
	private static final String TAG = "PersonProvider";
	MyDBOpenHelper openHelper;
	Uri baseuri = Uri.parse("content://cn.itcast.db.personprovider");
	static {
		matcher.addURI("cn.itcast.db.personprovider", "persons", ALL_PERSONS);
		// 指定一个路径的匹配规则 
		//如果路径 满足 content://cn.itcast.db.provider/persons 返回值就是( ALL_PERSONS) 1 
		matcher.addURI("cn.itcast.db.personprovider", "person/#",PERSON );
		//如果路径 满足 content://cn.itcast.db.provider/person/10 返回值就是( PERSON) 2
		matcher.addURI("cn.itcast.db.personprovider", "haha", HAHA);
		matcher.addURI("cn.itcast.db.personprovider", "insert", INSERT);
		matcher.addURI("cn.itcast.db.personprovider", "delete", DELETE);
		matcher.addURI("cn.itcast.db.personprovider", "update", UPDATE);	
		
	}
	
	
	/**
	 * PeronProvder 内容提供者第一次被创建的时候 调用的方法 
	 */
	@Override
	public boolean onCreate() {
		openHelper = new MyDBOpenHelper(getContext());
		return false;
	}

	@Override
	public Cursor query(Uri uri, String[] projection, String selection,
			String[] selectionArgs, String sortOrder) {
		int result = matcher.match(uri);
		switch (result) {
		// 符合 content://cn.itcast.db.provider/persons 代表的返回所有的数据 
		case ALL_PERSONS:
			PersonDBDao dao = new PersonDBDao(getContext());
			return  dao.findAllbyCursor();
		//content://cn.itcast.db.provider/person/10
		case PERSON:
			long id = ContentUris.parseId(uri);
	
			SQLiteDatabase db = openHelper.getReadableDatabase();
			if(db.isOpen()){
				Cursor cursor = db.query("person", null, "personid=?", new String[]{id+""}, null, null, null);
				return cursor;
			}
			
		case HAHA:
			Log.i(TAG,"我是haha对应的路径 ");
			break;
		default:
			throw new IllegalArgumentException("uri 不能被识别 ");
		}
		return null;
	}

	/**
	 * 有的时候 我们需要知道内容提供者返回的数据类型 
	 * 知道返回的数据 是一个集合呀 还是一个单独的条目 
	 * 
	 * 有的时候 告诉调用者 返回的数据是什么样的类型 
	 * mime的数据类型
	 */
	@Override
	public String getType(Uri uri) {
		int result = matcher.match(uri);
		switch (result) {
		// 符合 content://cn.itcast.db.provider/persons 代表的返回所有的数据 
		case ALL_PERSONS:
			return "vnd.android.cursor.dir/people";
		//content://cn.itcast.db.provider/person/10
		case PERSON:
			return "vnd.android.cursor.item/people";
		default :
			return null;
		}
	}

	@Override
	public Uri insert(Uri uri, ContentValues values) {
		// content://cn.itcast.db.provider/insert
		int result = matcher.match(uri);
		
		switch (result) {
		case INSERT:
			SQLiteDatabase db = openHelper.getWritableDatabase();
			db.insert("person", "personid", values);
			// 当数据发生改变的时候 
			getContext().getContentResolver().notifyChange(baseuri, null);
			return uri;
		default:
			throw new IllegalArgumentException("uri 不能被识别 ");
		}
	}

	@Override
	public int delete(Uri uri, String selection, String[] selectionArgs) {
		int result = matcher.match(uri);
		
		switch (result) {
		case DELETE:
			SQLiteDatabase db = openHelper.getWritableDatabase();
			getContext().getContentResolver().notifyChange(baseuri, null);
			return db.delete("person", selection, selectionArgs);
		default:
			throw new IllegalArgumentException("uri 不能被识别 ");
		}
	}

	@Override
	public int update(Uri uri, ContentValues values, String selection,
			String[] selectionArgs) {
		int result = matcher.match(uri);
		
		switch (result) {
		case UPDATE:
			SQLiteDatabase db = openHelper.getWritableDatabase();
			getContext().getContentResolver().notifyChange(baseuri, null);
			return db.update("person", values, selection, selectionArgs);

		default:
			throw new IllegalArgumentException("uri 不能被识别 ");
		}
	}

}

package cn.itcast.other;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;

public class OtherActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ContentResolver  resolver =  getContentResolver();
        Uri uri = Uri.parse("content://cn.itcast.db.personprovider/");
        
//        Cursor cursor = resolver.query(uri, null, null, null, null);
//        while (cursor!=null&& cursor.moveToNext()){
//        	String name = cursor.getString( cursor.getColumnIndex("name"));
//        	int age = cursor.getInt(cursor.getColumnIndex("age"));
//        	System.out.println("姓名 "+ name +" 年龄 "+ age);
//        }
        
       //  content://cn.itcast.db.personprovider
        // 注册了一个内容观察者 
        getContentResolver().registerContentObserver(uri, true , new MyObserver(new Handler()));
    }
    
    
    public class MyObserver extends ContentObserver{

		public MyObserver(Handler handler) {
			super(handler);
			
		}

		/**
		 * 当内容观察者发现了数据发生改变的时候 调用的方法 
		 */
		@Override
		public void onChange(boolean selfChange) {
			System.out.println("数据发生改变了 ");
			super.onChange(selfChange);
		}
    	
    }
}

监听新短信:

package cn.itcast.smslistener;

import android.app.Activity;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;

public class DemoActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Uri uri = Uri.parse("content://sms/");
        getContentResolver().registerContentObserver(uri, true, new SmsObserver(new Handler()));
    }
    
    public class SmsObserver extends ContentObserver{

		public SmsObserver(Handler handler) {
			super(handler);
		}

		@Override
		public void onChange(boolean selfChange) {
			System.out.println("有新的短信产生 ");
			Cursor cursor = getContentResolver().query(Uri.parse("content://sms/outbox"),null, null, null, null); 
			while(cursor.moveToNext()){
				StringBuilder sb = new StringBuilder();
				sb.append("_id=").append(cursor.getInt(cursor.getColumnIndex("_id")));
				sb.append(",address=").append(cursor.getString(cursor.getColumnIndex("address")));
				sb.append(";body=").append(cursor.getString(cursor.getColumnIndex("body")));
				sb.append(";time=").append(cursor.getLong(cursor.getColumnIndex("date")));
				System.out.println(sb.toString());
			}
			super.onChange(selfChange);
			
		}
    }
}

遍历联系人和写入;联系人

package cn.itcast.contact;

import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.test.AndroidTestCase;

public class TestContact extends AndroidTestCase {

	public void getAllContactInfo() throws Exception{
		String rawbase = "content://com.android.contacts/raw_contacts";
		String database = "content://com.android.contacts/data";
		Cursor cursor = getContext().getContentResolver().query(Uri.parse(rawbase), null, null, null, null);
		while (cursor.moveToNext()) {
			
			String id  = cursor.getString( cursor.getColumnIndex("_id"));
			System.out.println("id ="+ id);
			
			Cursor datacursor = getContext().getContentResolver().query(Uri.parse(database), null, "raw_contact_id=?", new String[]{id}, null);
			while (datacursor.moveToNext()) {
				
//				String[]  names = datacursor.getColumnNames();
//				for(int i =0;i<names.length;i++){
//					System.out.println(names[i]);
//				}

				String type = datacursor.getString(datacursor.getColumnIndex("mimetype"));
				System.out.println(type);
				
				if("vnd.android.cursor.item/email_v2".equals(type)){
					String data1 = datacursor.getString( datacursor.getColumnIndex("data1"));
					System.out.println("邮箱 "+ data1);
				}else if("vnd.android.cursor.item/name".equals(type)){
					String data1 = datacursor.getString( datacursor.getColumnIndex("data1"));
					System.out.println("姓名 "+ data1);
				}else if("vnd.android.cursor.item/phone_v2".equals(type)){
					String data1 = datacursor.getString( datacursor.getColumnIndex("data1"));
					System.out.println("电话号码 "+ data1);
				}
				
			}
			datacursor.close();
		
		}
		cursor.close();
	}
	
	
	public void writeContact() throws Exception{
		String rawbase = "content://com.android.contacts/raw_contacts";
		 ContentValues values = new ContentValues();
		 Uri  uri = getContext().getContentResolver().insert(Uri.parse(rawbase), values);
		 //返回的raw_contact 表中的_id
		 long id = ContentUris.parseId(uri);
		 
		 String database = "content://com.android.contacts/data";
		 ContentValues nameValues = new ContentValues();
		 nameValues.put("mimetype", "vnd.android.cursor.item/name");
		 nameValues.put("data1", "wangwu");
		 nameValues.put("raw_contact_id", id);
		 getContext().getContentResolver().insert(Uri.parse(database), nameValues);
		 
		 ContentValues phoneValues = new ContentValues();
		 phoneValues.put("mimetype", "vnd.android.cursor.item/phone_v2");
		 phoneValues.put("data1", "999999");
		 phoneValues.put("raw_contact_id", id);
		 getContext().getContentResolver().insert(Uri.parse(database), phoneValues);
		 
		 ContentValues emailValues = new ContentValues();
		 emailValues.put("mimetype", "vnd.android.cursor.item/email_v2");
		 emailValues.put("data1", "wangwu@sina.cn");
		 emailValues.put("raw_contact_id", id);
		 getContext().getContentResolver().insert(Uri.parse(database), emailValues);

//qq 同步助手
// 号簿管家 -> 文件 -> 上传服务器 
// pim 90多字段  体力活 


	}
	
	
}