Java 用户单击AlertDialog OK按钮后如何导航到下一个活动？_Java_Android

Java 用户单击AlertDialog OK按钮后如何导航到下一个活动？

java android

Java 用户单击AlertDialog OK按钮后如何导航到下一个活动？,java,android,Java,Android,很抱歉在中搜索后提出此问题。但在不同的部分使用以下代码时，我无法处理下一个活动当用户未连接到internet时，弹出窗口将发出警报，并在alertdialog中显示您未连接到internet，当用户单击alertdilog中的退出按钮时，应用程序将关闭。若用户已连接互联网，弹出窗口将发出警报，并在alertdialog中显示您已连接互联网，当用户单击“继续”按钮时，应用程序将继续进行下一个活动。我在继续下一个活动时遇到问题，如何做以下代码显示在其部分中 AndroidDetectionT

很抱歉在中搜索后提出此问题。但在不同的部分使用以下代码时，我无法处理下一个活动

当用户未连接到internet时，弹出窗口将发出警报，并在alertdialog中显示您未连接到internet，当用户单击alertdilog中的退出按钮时，应用程序将关闭。若用户已连接互联网，弹出窗口将发出警报，并在alertdialog中显示您已连接互联网，当用户单击“继续”按钮时，应用程序将继续进行下一个活动。我在继续下一个活动时遇到问题，如何做

以下代码显示在其部分中

AndroidDetectionTernetConnectionActivity.java中的代码

ConnectionDetector.java中的代码包com.example.detectinternetconnection

import android.app.AlertDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class ConnectionDetector {

private Context _context;

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

public boolean isConnectingToInternet(){
    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;
}
}

AndroidManifest.xml中的代码

告诉我哪里做错了？

在活动开始时添加以下内容：

使用：

完成后还可以按Ctrl+Shift+O

上述过程将所有必需的导入添加到类文件中

总代码很好，但只需创建并最终通过创建初始化alertdialog即可

    if (isInternetPresent) {              
    // Internet Connection is Present
   // make HTTP requests
    AlertDialog.Builder builder = new   AlertDialog.Builder(AndroidDetectInternetConnectionActivity.this);
    builder.setMessage("You have network connection.")
        .setTitle("Internet Connection")
        .setCancelable(false);

                alert.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which){ 
                      // Do call some activity. Do what you    wish to;
         startActivity(new  Intent(AndroidDetectInternetConnectionActivity.this,MainActivity2.class));
                  }
               }); 
          AlertDialog alert = builder.create();
                alert.show();

编辑

这是你的全部活动课程

package com.example.detectinternetconnection;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class AndroidDetectInternetConnectionActivity  extends Activity implements   OnClickListener {

Boolean isInternetPresent = false;
ConnectionDetector cd;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    Button btnStatus = (Button) findViewById(R.id.btnStatus);
    cd = new ConnectionDetector(getApplicationContext());
    btnStatus.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    isInternetPresent = cd.isConnectingToInternet();
    if (isInternetPresent) {

        AlertDialog alert;
        AlertDialog.Builder builder = new AlertDialog.Builder(
                AndroidDetectInternetConnectionActivity .this);
        builder.setTitle("Internet Connection");
        builder.setCancelable(false);

        builder.setPositiveButton("Continue",
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        startActivity(new Intent(AndroidDetectInternetConnectionActivity .this,
                                MainActivity2 .class));
                    }
                });

        alert = builder.create();
        alert.show();
    }

    else {

        AlertDialog alert;
        AlertDialog.Builder builder = new AlertDialog.Builder(
                AndroidDetectInternetConnectionActivity .this);
        builder.setTitle("No Internet Connection");
        builder.setMessage("Please Connect To Internet");
        builder.setCancelable(false);

        builder.setPositiveButton("Exit",
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });

        alert = builder.create();
        alert.show();
    }
}

}

我想你会负责其他课程。有关一些知识，你可以参考开发者网站上的教程。

这里我得到错误警报对话框警报=builder.create；alert.SetButtonContainue，new DialogInterface.OnClickListener{@Override public void onClickDialogInterface dialog，int，其中{//Do call some activity.Do you want；startActivitynew intent和RoidDetectInternetConnectionActivity.this，main activity2.class；}你到底遇到了什么问题。说意图无法解决。你可以发布你的日志吗…谢谢工作。但另一个错误是我在这里得到AlertDialog alert=builder.create；alert.setButton2Exit，new DialogInterface.OnClickListener{public void onClickDialogInterface dialog，int，其中{//关闭程序AndroidDetectionTernetConnectionActivity.this.finish；}}；错误为键入new DialogInterface.OnClickListener{}必须实现继承的抽象方法DialogInterface.OnClickListener.onClickDialogInterface，IntReference Ranjit Patils回答上述问题！此外，如果上述方法对您有所帮助，您可以通过单击旁边的勾号来接受我的回答：谢谢，工作正常..但AlertDialog alert=builder.create；alert.setButton中出现错误2Exit，new DialogInterface.OnClickListener{public void onClickDialogInterface dialog，int表示类型new DialogInterface.OnClickListener{}必须实现继承的抽象方法DialogInterface.OnClickListener.onClickDialogInterface，intelse{AlertDialog.Builder Builder=new AlertDialog.BuilderAndRoidDetectionInternetConnectionActivity.this；Builder.SetMessage使用此应用程序需要网络连接。请在设置中打开移动网络或Wi-Fi。.setTitleNo Internet connection.setCancelablefalse；AlertDialog alert=Builder.create；alert.setButton2Exit，new DialogInterface.*OnClickListener**{public void onClickDialogInterface dialog，int其中{androiddetectionternetconnectactivity.this.finish；}}；//在第一个blod错误中显示警报消息Alert.show；}是类型new DialogInterface.OnClickListener{}必须实现继承的抽象方法DialogInterface.OnClickListener.onClickDialogInterface，intclick ctrl+shift+O..正如柴修女所说的…为了自动实现。此错误正在发生，因为您没有导入适当的包。先生，请将您的电子邮件id发送给我。Nanu kuda karnataka davanu。错误已被清除，但在运行应用程序期间，我获取这些错误[2014-02-04 16:32:13-AndroidDetectionTernetConnection]主页在设备“emulator-5556”上[2014-02-04 16:32:13-AndroidDetectionTernetConnection]将AndroidDetectionTernetConnection.apk上载到设备“emulator-5556”[2014-02-04 16:32:14-AndroidDetectionTernetConnection]安装AndroidDetectionTernetConnection.apk。。。

import android.content.Intent;

Intent mainIntent;

                    mainIntent = new Intent(CurrentClass.this,ClassToBeLoaded.class); 

                    CurrentClass.this.startActivity(mainIntent);
                    CurrentClass.this.finish();

    if (isInternetPresent) {              
    // Internet Connection is Present
   // make HTTP requests
    AlertDialog.Builder builder = new   AlertDialog.Builder(AndroidDetectInternetConnectionActivity.this);
    builder.setMessage("You have network connection.")
        .setTitle("Internet Connection")
        .setCancelable(false);

                alert.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which){ 
                      // Do call some activity. Do what you    wish to;
         startActivity(new  Intent(AndroidDetectInternetConnectionActivity.this,MainActivity2.class));
                  }
               }); 
          AlertDialog alert = builder.create();
                alert.show();

package com.example.detectinternetconnection;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class AndroidDetectInternetConnectionActivity  extends Activity implements   OnClickListener {

Boolean isInternetPresent = false;
ConnectionDetector cd;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    Button btnStatus = (Button) findViewById(R.id.btnStatus);
    cd = new ConnectionDetector(getApplicationContext());
    btnStatus.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    isInternetPresent = cd.isConnectingToInternet();
    if (isInternetPresent) {

        AlertDialog alert;
        AlertDialog.Builder builder = new AlertDialog.Builder(
                AndroidDetectInternetConnectionActivity .this);
        builder.setTitle("Internet Connection");
        builder.setCancelable(false);

        builder.setPositiveButton("Continue",
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        startActivity(new Intent(AndroidDetectInternetConnectionActivity .this,
                                MainActivity2 .class));
                    }
                });

        alert = builder.create();
        alert.show();
    }

    else {

        AlertDialog alert;
        AlertDialog.Builder builder = new AlertDialog.Builder(
                AndroidDetectInternetConnectionActivity .this);
        builder.setTitle("No Internet Connection");
        builder.setMessage("Please Connect To Internet");
        builder.setCancelable(false);

        builder.setPositiveButton("Exit",
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });

        alert = builder.create();
        alert.show();
    }
}

}