Android 检测网络连接状态
Android连接网络的时候,并不是每次都能连接到网络,因此在程序启动中需要对网络的状态进行判断,如果没有网络则提醒用户进行设置。
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):
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
然后,检测网络状态是否可用
- /**
- * 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
- /**
- * 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...");
- }
- }
运行界面: