Android 检查网络是否可用

/**
     * 判断是否有网络
     * 
     * @param context
     * @return
     */
    public static boolean checkNetworkConnection(Context context) {
        ConnectivityManager connectivity = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = connectivity.getActiveNetworkInfo();
        if (info == null || !info.isAvailable()) {
            return false;
        }
        return true;
    }
    
    /**
     * 网络不可用警告框
     * 
     * @param context
     * @return
     */
    public static void netUnableDialog_main(Context context) {
        AlertDialog.Builder builder = new Builder(context);
        builder.setMessage("请检查网络设备");
        builder.setTitle("网络不可用");
        builder.setPositiveButton("确认",
                new android.content.DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        android.os.Process.killProcess(android.os.Process
                                .myPid());
                    }
                });
        builder.create().show();
    }



<span style="font-family:'Comic Sans MS';font-size:18px;"> android.os.Process.killProcess(android.os.Process.myPid()) 这句代码，它将 app 这个 process kill <span style="font-family:'Comic Sans MS';">掉。</span></span>