Android 检测网络连接状态

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

	/**
	 * 对网络连接状态进行判断
	 * @return  true, 可用； false， 不可用
	 */
	private boolean isOpenNetwork() {
		ConnectivityManager connManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
		if(connManager.getActiveNetworkInfo() != null) {
			return connManager.getActiveNetworkInfo().isAvailable();
		}

		return false;
	}

	/**
	 * 访问百度主页，网络不可用则需设置
	 */
	private void initMoreGames() {
		String URL_MOREGAMES = "http://www.baidu.com";
		mWebView = (WebView) findViewById(R.id.view_gamesort);

		if (mWebView != null) {
			mWebView.requestFocus();
			WebSettings webSettings = mWebView.getSettings();
			if (webSettings != null) {
				webSettings.setJavaScriptEnabled(true);
				webSettings.setCacheMode(MODE_PRIVATE);
				webSettings.setDefaultTextEncodingName("utf-8");
			}

			// 判断网络是否可用
			if(isOpenNetwork() == true) {
				mWebView.loadUrl(URL_MOREGAMES);
			} else {
				AlertDialog.Builder builder = new AlertDialog.Builder(MoreGamesActivity.this);
				builder.setTitle("没有可用的网络").setMessage("是否对网络进行设置?");
				
				builder.setPositiveButton("是", new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						Intent intent = null;
						
						try {
							String sdkVersion = android.os.Build.VERSION.SDK;
							if(Integer.valueOf(sdkVersion) > 10) {
								intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
							}else {
								intent = new Intent();
								ComponentName comp = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
								intent.setComponent(comp);
								intent.setAction("android.intent.action.VIEW");
							}
							MoreGamesActivity.this.startActivity(intent);
						} catch (Exception e) {
							Log.w(TAG, "open network settings failed, please check...");
							e.printStackTrace();
						}
					}
				}).setNegativeButton("否", new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						dialog.cancel();		
						finish();
					}
				}).show();
			}
		} else {
			Log.w(TAG, "mWebView is null, please check...");
		}
	}