教你如何开关Android的APN网络

说明：此程序需要将手机上的数据连接的按钮(下图)打开，才好使。（怎么用程序去打开这个按钮呢？各位大牛请不吝赐教！！！）

由于Android对于APN的网络API没有公开，不过我们可以阅读源代码，然后进行数据库操作，系统会自动监听数据库的变化，从而实现开启或者关闭APN。

大家可以研究一下frameworks/base/core/java/android/provider/Telephony.java这个类，

比较重要的就是 URI 和数据库字段： content://telephony/carriers

字段可以在Telephony.java中找到。

其实原理很简单：

1 、当开启APN的时候，设置一个正确的移动或者联通的APN

2、关闭的时候设置一个错误APN就会自动关闭网络

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.ConnectivityManager;
import android.net.NetworkInfo.State;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class OpenApnActivity extends Activity {

	Uri uri = Uri.parse("content://telephony/carriers");

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		Button open = (Button) findViewById(R.id.btnOpen);
		Button close = (Button) findViewById(R.id.btnClose);
		Button btnGoto = (Button) findViewById(R.id.btnGoto);

		open.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				openAPN();
			}
		});
		close.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				closeAPN();
			}
		});

		btnGoto.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent();
				intent.setClass(OpenApnActivity.this, EX05_17.class);
				// 调用一个新的Activity
				startActivity(intent);
			}
		});

	}

	public void openAPN() {
		List<APN> list = getAPNList();
		for (APN apn : list) {
			ContentValues cv = new ContentValues();
			cv.put("apn", APNMatchTools.matchAPN(apn.apn));
			cv.put("type", APNMatchTools.matchAPN(apn.type));
			getContentResolver().update(uri, cv, "_id=?",
					new String[] { apn.id });
		}
		try {
			Thread.sleep(5000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		check3GNetWork();
	}

	private void check3GNetWork() {
		ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
		State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
				.getState();
		// 如果3G网络未连接，且不是出于正在连接状态
		if (mobile == State.CONNECTED || mobile == State.CONNECTING) {
			return;
		}
		Toast.makeText(getApplicationContext(), "网络未连接上...", Toast.LENGTH_LONG)
				.show();
	}

	public void closeAPN() {
		List<APN> list = getAPNList();
		for (APN apn : list) {
			ContentValues cv = new ContentValues();
			cv.put("apn", APNMatchTools.matchAPN(apn.apn) + "mdev");
			cv.put("type", APNMatchTools.matchAPN(apn.type) + "mdev");
			getContentResolver().update(uri, cv, "_id=?",
					new String[] { apn.id });
		}
	}

	private List<APN> getAPNList() {
		String tag = "Main.getAPNList()----------->";
		// current不为空表示可以使用的APN
		String projection[] = { "_id,apn,type,current" };
		Cursor cr = this.getContentResolver().query(uri, projection, null,
				null, null);
		List<APN> list = new ArrayList<APN>();
		while (cr != null && cr.moveToNext()) {
			APN a = new APN();
			a.id = cr.getString(cr.getColumnIndex("_id"));
			a.apn = cr.getString(cr.getColumnIndex("apn"));
			a.type = cr.getString(cr.getColumnIndex("type"));
			Log.d(tag,
					cr.getString(cr.getColumnIndex("_id")) + "  "
							+ cr.getString(cr.getColumnIndex("apn")) + "  "
							+ cr.getString(cr.getColumnIndex("type")) + "  "
							+ cr.getString(cr.getColumnIndex("current")));
			list.add(a);
		}
		if (cr != null)
			cr.close();
		return list;
	}

	public static class APN {
		String id;
		String apn;
		String type;
	}
}

public final class APNMatchTools {
	public static class APNNet {
		/*** 中国移动cmwap*/
		public static String CMWAP = "cmwap";

		/*** 中国移动cmnet*/
		public static String CMNET = "cmnet";

		/** 中国联通3GWAP设置 中国联通3G因特网设置 中国联通WAP设置 中国联通因特网设置*/
		/** 3gwap 3gnet uniwap uninet*/
		/**3G wap 中国联通3gwap APN*/
		public static String GWAP_3 = "3gwap";

		/*** 3G net 中国联通3gnet APN*/
		public static String GNET_3 = "3gnet";

		/** uni wap 中国联通uni wap APN*/
		public static String UNIWAP = "uniwap";
		/** uni net 中国联通uni net APN*/
		public static String UNINET = "uninet";
		/**  中国电信net APN*/
		public static String CTNET = "ctnet";
	}

	public static String matchAPN(String currentName) {
		if ("".equals(currentName) || null == currentName) {
			return "";
		}
		currentName = currentName.toLowerCase();
		if (currentName.startsWith(APNNet.CMNET))
			return APNNet.CMNET;
		else if (currentName.startsWith(APNNet.CMWAP))
			return APNNet.CMWAP;
		else if (currentName.startsWith(APNNet.GNET_3))
			return APNNet.GNET_3;
		else if (currentName.startsWith(APNNet.GWAP_3))
			return APNNet.GWAP_3;
		else if (currentName.startsWith(APNNet.UNINET))
			return APNNet.UNINET;
		else if (currentName.startsWith(APNNet.UNIWAP))
			return APNNet.UNIWAP;
		else if (currentName.startsWith("default"))
			return "default";
		else if (currentName.startsWith(APNNet.CTNET))
			return APNNet.CTNET;
		else
			return "";
		/** return currentName.substring(0, currentName.length() -
		 SUFFIX.length());*/
	}
}

<uses-permission android:name="android.permission.WRITE_APN_SETTINGS"></uses-permission>

来源：https://www.cnblogs.com/cpcpc/archive/2011/07/13/2122994.html

标签

apn

android数据库

手机apn