内容观察者：监听短信

package com.itheima28.contentobserverdemo;


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;
import android.util.Log;


public class MainActivity extends Activity {


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

// 监听系统短信

ContentResolver resolver = getContentResolver();

// 注册一个内容观察者观察短信数据库
resolver.registerContentObserver(Uri.parse("content://sms/"), true, new MyContentObserver(new Handler()));
}

/**
* @author andong
* 内容观察者
*/
class MyContentObserver extends ContentObserver {


private static final String TAG = "MyContentObserver";


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


/**
* 当被监听的内容发生改变时回调
*/
@Override
public void onChange(boolean selfChange) {
Log.i(TAG, "短信改变了");
Uri uri = Uri.parse("content://sms/outbox");// 发件箱的uri

// 查询发件箱的内容
Cursor cursor = getContentResolver().query(uri, new String[]{"address", "date", "body"}, null, null, null);
if(cursor != null && cursor.getCount() > 0) {

String address;
long date;
String body;
while(cursor.moveToNext()) {
address = cursor.getString(0);
date = cursor.getLong(1);
body = cursor.getString(2);

Log.i(TAG, "号码: " + address + ", 日期: " + date + ", 内容: " + body);
}
cursor.close();
}
}
}
}