android检测网络连接状态示例讲解

Android连接首先，要判断网络状态，需要有相应的权限，下面为权限代码（AndroidManifest.xml）：

复制代码代码如下:

然后，检测网络状态是否可用

复制代码代码如下:
/**
* 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;
}

最后，不可用则打开网络设置

复制代码代码如下:
/**
* 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...");
    }
}

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