Android开发入门之监听ContentProvider中数据的变化

public void insert(View v) {
Uri uri = Uri
.parse("content://cn.leigo.providers.personprovider/person");
ContentResolver resolver = this.getContentResolver();
ContentValues values = new ContentValues();
values.put("name", "A-App");
values.put("phone", "18800000000");
values.put("amount", 12000);
resolver.insert(uri, values);
}

@Override
public Uri insert(Uri uri, ContentValues values) {
SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
switch (MATCHER.match(uri)) {
case PERSONS:
long rowid = db.insert("person", "name", values); // 主键值
// content://cn.leigo.providers.personprovider/person/10
// Uri insertUri =
// Uri.parse("content://cn.leigo.providers.personprovider/person/"+
// rowid);
Uri insertUri = ContentUris.withAppendedId(uri, rowid);
//发出数据变化通知
this.getContext().getContentResolver().notifyChange(uri, null);
return insertUri;
default:
throw new IllegalArgumentException("this is Unknow Uri:" + uri);
}
}

package cn.leigo.bapp;

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

public class MainActivity extends Activity {
private static final String TAG = "MainActivity";

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

Uri uri = Uri
.parse("content://cn.leigo.providers.personprovider/person");
this.getContentResolver().registerContentObserver(uri, true,
new Observer(new Handler()));

}

private class Observer extends ContentObserver {

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

@Override
public void onChange(boolean selfChange) {
Uri uri = Uri
.parse("content://cn.leigo.providers.personprovider/person");
Cursor cursor = getApplicationContext().getContentResolver().query(uri, null, null, null,
"personid desc limit 1");
if (cursor.moveToFirst()) {
String name = cursor.getString(cursor.getColumnIndex("name"));
Log.i(TAG, name);
}
}

}

}