MainActivity如下:

package cc.c;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.Context;
import android.content.Loader;
import android.database.Cursor;
/**
 * Demo描述:
 * 利用Loader实现窃听短信
 * 
 * 参考资料:
 * 1 http://blog.csdn.net/niu_gao/article/details/7244117
 * 2 http://www.cnblogs.com/jisheng/archive/2013/01/09/2852553.html
 * 3 http://blog.csdn.net/linmiansheng/article/details/25836937
 *   Thank you very much
 * 
 * 注意事项:
 * 1 Loader是3.0之后才引进来的
 * 2 若在3.0之前使用Loader那么Activity须继承FragmentActivity
 * 3 在Loader内部封装好了ContentOberver
 *
 */
public class MainActivity extends Activity implements LoaderCallbacks<Cursor>{
    private final int LOADER_ID=9527;
    private Context mContext;
    private Uri mUri=null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}
	
	private void init(){
		mContext=this;
		mUri = Uri.parse("content://sms/inbox");
		this.getLoaderManager().initLoader(LOADER_ID, null, this);
	}

	@Override
	public Loader<Cursor> onCreateLoader(int arg0, Bundle bundle) {
		String[] projection = new String[] {"_id","address","body","type"};
		Loader<Cursor> cursorLoader=
		new android.content.CursorLoader(mContext, mUri, projection, null, null, "date desc");
		return cursorLoader;
	}

	@Override
	public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
        while (cursor.moveToNext()) {
        	String address  = cursor.getString(cursor.getColumnIndex("address"));
    		String body = cursor.getString(cursor.getColumnIndex("body"));
    		int id = cursor.getInt(cursor.getColumnIndex("_id"));
    		String type  = cursor.getString(cursor.getColumnIndex("type"));
    		System.out.println("------> 收到新的短信:"+"来自="+address+",内容="+body+",id="+id+",类别="+type);
    		break;
		}
	}

	@Override
	public void onLoaderReset(Loader<Cursor> loader) {
		
	}
	
	


}

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="利用Loader实现窃听短信"
        android:layout_centerInParent="true" />

</RelativeLayout>

AndroidManifest.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cc.c"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="14" />
    
      <uses-permission android:name="android.permission.READ_SMS" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="cc.c.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>