要求用户连接到互联网或退出应用程序 (android)

Question

我正在开发一个图片库应用程序，该应用程序正在从互联网检索图像。

所以我想提示一个对话框要求用户连接到互联网或退出应用程序。

向用户显示 WiFi 和运营商网络选项。

Answer 1

这会检查 wifi 和移动数据。在启动画面或主要活动上运行 tis 代码以检查网络连接。如果网络未连接，则弹出对话框并完成活动。就这么简单

private boolean haveNetworkConnection() {
    boolean haveConnectedWifi = false;
    boolean haveConnectedMobile = false;

    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo[] netInfo = cm.getAllNetworkInfo();
    for (NetworkInfo ni : netInfo) {
        if (ni.getTypeName().equalsIgnoreCase("WIFI"))
            if (ni.isConnected())
                haveConnectedWifi = true;
        if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
            if (ni.isConnected())
                haveConnectedMobile = true;
    }
    return haveConnectedWifi || haveConnectedMobile;
}

Answer 2

试试这个：

public static boolean isConnected(Context context){
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo wifiInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
NetworkInfo mobileInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

if ((wifiInfo != null && wifiInfo.isConnected()) || (mobileInfo != null && mobileInfo.isConnected())) {
        return true;
}else{
        showDialog();
         return false;
}

private void showDialog()
{
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("Connect to wifi or quit")
        .setCancelable(false)
        .setPositiveButton("Connect to WIFI", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
                startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
           }
         })
        .setNegativeButton("Quit", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
                this.finish();
           }
        });
         AlertDialog alert = builder.create();
         alert.show();
}

Answer 3

首先您应该检查它们是否已经连接（大量示例如何在线执行此操作）

如果没有，则使用此代码

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Connect to wifi or quit")
.setCancelable(false)
.setPositiveButton("Connect to WIFI", new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int id) {
        startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
   }
 })
.setNegativeButton("Quit", new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int id) {
        this.finish();
   }
});
 AlertDialog alert = builder.create();
 alert.show();

Answer 4

//Checking For Internet Connection
ConnectionDetector cd = new ConnectionDetector(getApplicationContext()); 

    // Check if Internet present
    if (!cd.isConnectingToInternet()) {
        // Internet Connection is not present
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Connect to wifi or quit")
       .setCancelable(false)
       .setPositiveButton("Connect to WIFI", new DialogInterface.OnClickListener() {

               public void onClick(DialogInterface dialog, int id) {
                   startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
               }
        })
      .setNegativeButton("Quit", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
               this.finish();
         }
      });
      AlertDialog alert = builder.create();
      alert.show();

    return;
    }

Answer 5

这就是它的完成方式。

此类检查有效的互联网连接：

public class ConnectionStatus {

    private Context _context;

    public ConnectionStatus(Context context) {
        this._context = context;
    }

    public boolean isConnectionAvailable() {
        ConnectivityManager connectivity = (ConnectivityManager) _context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivity != null) {
            NetworkInfo[] info = connectivity.getAllNetworkInfo();
            if (info != null)
                for (int i = 0; i < info.length; i++)
                    if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                        return true;
                    }
        }
        return false;
    }
}

如果没有有效的互联网连接，以下方法会打开 wi-fi 面板：

public void addListenerOnWifiButton() {
        Button btnWifi = (Button)findViewById(R.id.btnWifi);

        iia = new ConnectionStatus(getApplicationContext());

        isConnected = iia.isConnectionAvailable();
        if (!isConnected) {
            btnWifi.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
                    Toast.makeText(getBaseContext(), "Please connect to a hotspot",
                            Toast.LENGTH_SHORT).show();
                }
            });
        }
        else {
            btnWifi.setVisibility(4);
            warning.setText("This app may use your mobile data to update events and get their details.");
        }
    }

如果没有有效的互联网连接，以下方法会打开 3G 面板：

public void addListenerOn3GButton() {
    Button btnThreeGee = (Button)findViewById(R.id.btn3G);
    iia = new ConnectionStatus(getApplicationContext());

    isConnected = iia.isConnectionAvailable();
    if (!isConnected) {
        btnThreeGee.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            startActivity(new Intent(Settings.ACTION_DATA_ROAMING_SETTINGS));
            Toast.makeText(getBaseContext(), "Please check 'Data enabled' option",
                    Toast.LENGTH_SHORT).show();
        }
    });
    }
    else {

         btnThreeGee.setVisibility(4);
         cont.setVisibility(View.VISIBLE);
         warning.setText("This app may use your mobile data to update events and get their details.");
        }
}

希望这会有所帮助:)