Android手机(移动GSM)在休眠或开机后不能成功启用网络链接(设置都正常),有时候甚至状态栏图标是连接的,但网络依旧不可用。

如下解决方法,不知可通用,但测试HTC野火手机移动版可使用:

(被这个问题折腾死了,从本站相关文章可以看到,之前尝试了APN切换也不行,估计是网络enable==false)

package com.wiz.tools;

import java.lang.reflect.Method;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.telephony.TelephonyManager;
import android.util.Log;
/**
 * Wizzer.cn
 * @author Wizzer
 *
 */
public class NetCheck {
	public static final Uri APN_URI = Uri.parse("content://telephony/carriers");
	public static final Uri DEFAULTAPN_URI = Uri
			.parse("content://telephony/carriers/restore");
	public static final Uri CURRENT_APN_URI = Uri
			.parse("content://telephony/carriers/preferapn");
	public static Context c1;

	public static String getCurrentAPNFromSetting(ContentResolver resolver) {
		Cursor cursor = null;
		try {
			cursor = resolver.query(CURRENT_APN_URI, null, null, null, null);
			String curApnId = null;
			String apnName1 = null;
			if (cursor != null && cursor.moveToFirst()) {
				curApnId = cursor.getString(cursor.getColumnIndex("_id"));
				apnName1 = cursor.getString(cursor.getColumnIndex("apn"));
			}
			Log.e("NetCheck getCurrentAPNFromSetting", "curApnId:" + curApnId
					+ " apnName1:" + apnName1);
			// find apn name from apn list
			if (curApnId != null) {
				cursor = resolver.query(APN_URI, null, " _id = ?",
						new String[] { curApnId }, null);
				if (cursor != null && cursor.moveToFirst()) {
					String apnName = cursor.getString(cursor
							.getColumnIndex("apn"));
					return apnName;
				}
			}

		} catch (SQLException e) {
			Log.e("NetCheck getCurrentAPNFromSetting", e.getMessage());
		} finally {
			if (cursor != null) {
				cursor.close();
			}
		}

		return null;
	}

	public static int updateCurrentAPN(ContentResolver resolver, String newAPN) {
		Cursor cursor = null;
		try {
			// get new apn id from list
			cursor = resolver.query(APN_URI, null, " apn = ? and current = 1",
					new String[] { newAPN.toLowerCase() }, null);
			String apnId = null;
			if (cursor != null && cursor.moveToFirst()) {
				apnId = cursor.getString(cursor.getColumnIndex("_id"));
			}
			Log.e("NetCheck updateCurrentAPN", "apnId:" + apnId);
			// set new apn id as chosen one
			if (apnId != null) {
				ContentValues values = new ContentValues();
				values.put("apn_id", apnId);
				resolver.update(CURRENT_APN_URI, values, null, null);
			} else {
				// apn id not found, return 0.
				return 0;
			}
		} catch (SQLException e) {
			Log.e("NetCheck updateCurrentAPN", e.getMessage());
		} finally {
			if (cursor != null) {
				cursor.close();
			}
		}

		// update success
		return 1;
	}

	public String getApn(Context c) {
		boolean netSataus = false;

		ConnectivityManager conManager = (ConnectivityManager) c
				.getSystemService(Context.CONNECTIVITY_SERVICE);	
		if (conManager.getActiveNetworkInfo() != null) {
			netSataus = conManager.getActiveNetworkInfo().isAvailable();

		}
		NetworkInfo info = conManager
		.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
		String oldAPN = StringUtils.null2String(info.getExtraInfo());
		Log
		.e("NetCheck getApn", "oldAPN:" + oldAPN + " netSataus:"
				+ netSataus);
		if (netSataus == false) {
			Log.e("NetCheck getApn", "setMobileDataEnabled(true)");
			setMobileDataEnabled(c, true);	

			try {
				Thread.sleep(4012);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		if("".equals(oldAPN)){			
			updateCurrentAPN(c.getContentResolver(), "cmnet");
			try {
				Thread.sleep(1500);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		info = conManager
		.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
		oldAPN = StringUtils.null2String(info.getExtraInfo());
		Log
				.e("NetCheck getApn", "newApn:" + oldAPN);
		return oldAPN.toLowerCase();
	}

	public boolean setMobileDataEnabled(Context c, boolean enabled) {
		final TelephonyManager mTelManager;
		mTelManager = (TelephonyManager) c
				.getSystemService(Context.TELEPHONY_SERVICE);
		try {

			Method m = mTelManager.getClass()
					.getDeclaredMethod("getITelephony");
			m.setAccessible(true);
			Object telephony = m.invoke(mTelManager);
			m = telephony.getClass().getMethod(
					(enabled ? "enable" : "disable") + "DataConnectivity");
			m.invoke(telephony);
			return true;
		} catch (Exception e) {
			Log.e("NetCheck ", "cannot fake telephony", e);
			return false;
		}
	}

}

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