Startactivity intent ошибка

I want after a click on the OK button the MenuActivity to be shown. I have already searched on the Internet to find an answer and tried everything. I haave the activity declared in the AndroidManifest and I also tried to use Intent(this, MenuActivity.class) and also the one with the action inside but it doesn’t work.

MainActivity:

package com.jamesjohnson.chronos;

import android.app.AlertDialog;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.*;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.jamesjohnson.chronos.R;


public class MainActivity extends ActionBarActivity implements OnClickListener {

private static final String TAG = "MainActivity";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    this.setTitle("Willkommen");
    Button button = (Button) findViewById(R.id.button);
    button.setOnClickListener(this);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    switch(id) {
        case R.id.action_mainmenu:
            startActivity(new Intent("com.jamesjohnson.chronos.MenuActivity"));
            return true;
        case R.id.action_settings:
            showMessageBox("Es gibt leider noch keine Einstellungen. Wir arbeiten daran!", true, true);
            return true;

    }

    return super.onOptionsItemSelected(item);
}

@Override
public void onClick(View v) {
    try {
        Intent intent = new Intent(MainActivity.this, MenuActivity.class);
        Context ctx = this;
        intent.setClassName(ctx, "com.jamesjohnson.chronos.MenuActivity");
        intent.setAction("com.jamesjohnson.chronos.MenuActivity");
        if ((intent.getAction() == "com.jamesjohnson.chronos.MenuActivity") || (intent.getClass() != null)) {
            MainActivity.this.startActivity(intent);
            showMessageBox("Button has been pressed " + intent.toString(), true, true);
        }
        else {
            showMessageBox("Error : Hauptmenü ist nicht erreichbar", true, true);
        }
    }
    catch (ActivityNotFoundException an) {
        showMessageBox("Error :" + an.getMessage(), true, true);
    }
    catch (Exception e) {
        showMessageBox("Error :" + e.getMessage(), true, true);
    }
}

protected void showMessageBox(String message, boolean showOKbutton, boolean canceable) {
    AlertDialog.Builder dlgAlert = new AlertDialog.Builder(MainActivity.this);

    dlgAlert.setMessage(message);
    dlgAlert.setTitle("Chronos");
    if (showOKbutton) {
        dlgAlert.setPositiveButton("OK", null);
    }
    if (canceable) {
        dlgAlert.setCancelable(true);
    }
    dlgAlert.create().show();
}
}

Here’s my AndroidManifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.jamesjohnson.chronos"
    android:versionCode="1"
    android:versionName="1.0.1
    " >

    <application

        android:allowBackup="true"
        android:debuggable="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".MenuActivity"
            android:label="@string/title_activity_menu"
            android:parentActivityName=".MainActivity" >
            <intent-filter>
                <action android:name="com.jamesjohnson.chronos.MenuActivity" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <!-- Parent activity meta-data to support 4.0 and lower -->
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.jamesjohnson.chronos.MainActivity" />
        </activity>
    </application>

</manifest>

And finally here’s the MenuActivity:

package com.jamesjohnson.chronos;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;


public class MenuActivity extends ListActivity {

    private static final String TAG = "MenuActivity";
    static final String[] ENTRIES = new String[] {"Kunden", "Projekte", "Leistungen", "Zeiten"};
    ListView listView = getListView();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        showMessageBox("Activity is beeing created", true, true);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);
        this.setTitle("Hauptmenü");
        this.setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, ENTRIES));
        listView.setOnItemClickListener(new OnItemClickListener(){
           public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
               switch (position) {
                   case 0:
                       showMessageBox("Kunden", true, true);
                       break;
                   case 1:
                       showMessageBox("Projekte", true, true);
                       break;
                   case 2:
                       showMessageBox("Leistungen", true, true);
                       break;
                   case 3:
                       showMessageBox("Zeiten", true, true);
                       break;
                   default:
                       showMessageBox("Error: Undefined index", true, true);
               }
           }
        });
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    protected void showMessageBox(String message, boolean showOKbutton, boolean canceable) {
        AlertDialog.Builder dlgAlert = new AlertDialog.Builder(MenuActivity.this);

        dlgAlert.setMessage(message);
        dlgAlert.setTitle("Chronos");
        if (showOKbutton) {
            dlgAlert.setPositiveButton("OK", null);
        }
        if (canceable) {
            dlgAlert.setCancelable(true);
        }
        dlgAlert.create().show();
    }
}

Unfortunately I can’t show you my Logcat because it doesn’t work on my computer. (I always have to export the APK to test the App).

P.S. I am working with Android Studio 1.0.1
…Please HELP ME !

All solutions to this problem here did not help, so I ask in a new question.

I need to open an activity from an OnItemClickListener method of a ListView, but it simply does nothing… New activity is neither opened nor thrown an exception.

This is the code that tries to show the activity:

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    public void onItemClick(AdapterView <? > parent, View v, int position, long id) {
        try {
            ImageGalleryItem item = (ImageGalleryItem) parent.getItemAtPosition(position);
            //Create intent
            Intent intent = new Intent(v.getContext(), DetailsActivity.class);
            intent.putExtra("title", item.getTitle());
            intent.putExtra("image", item.getImage());

            //Start details activity
            startActivity(intent);
        } catch (Exception e) {
            Auditing.LogError(e);
        }
    }
});

This is the Manifest file:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cl.virtualice.tdc">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
    <uses-permission android:name="android.permission.VIBRATE"/>
    <uses-feature android:name="android.hardware.Camera" android:required="true" />

    <application
        android:label="@string/app_title"
        android:icon="@drawable/ic_tdc"
        android:theme="@style/AppTheme"
        android:allowBackup="true">

        <activity
            android:name=".activities.MainActivity"
            android:theme="@style/AppTheme"
            android:label="@string/app_title">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".activities.FormActivity"
            android:parentActivityName=".activities.MainActivity">
        </activity>
        <activity
            android:name=".activities.GalleryActivity"
            android:parentActivityName=".activities.FormActivity">
        </activity>
        <activity
            android:name=".activities.DetailsActivity"
            android:parentActivityName=".activities.GalleryActivity">
        </activity>
    </application>

</manifest>

And this is the new Activity code:

package cl.virtualice.tdc.activities;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

import cl.virtualice.tdc.R;

/**
 * Created by Jaime on 23-10-2015.
 */
public class DetailsActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_details);
        String title = getIntent().getStringExtra("title");
        Bitmap bitmap = getIntent().getParcelableExtra("image");

        TextView titleTextView = (TextView) findViewById(R.id.title);
        titleTextView.setText(title);

        ImageView imageView = (ImageView) findViewById(R.id.image);
        imageView.setImageBitmap(bitmap);
    }
}

Any help please?

Делаю такую логику приложения: переход в другую активность при нажатии элемента RecyclerView. Слушатель добавил в onBindViewHolder, срабатывает нормально, тестовое сообщение появляется после нажатия. Но при написании кода студия красит красным метод startActivity, не могу понять почему. Подскажите пожалуйста возможные причины, может кто сталкивался с таким/ Код адаптера привожу полностью:

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {

    private List<Book> booksList;

    public RecyclerAdapter(List<Book> booksList) {

        this.booksList = booksList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        Context context = parent.getContext();
        LayoutInflater inflater = LayoutInflater.from(context);
        View view = inflater.inflate(R.layout.card, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        Book book = booksList.get(position);
/**
 * Загрузка обложки из интернета. Сссылки в MainActivity
 */
        Picasso
                .with(holder.imgObl.getContext())
                .load(book.getResId())
                .into(holder.imgObl);
/**
 * обработка нажатия на элемент списка RecyclerView
  */
        holder.imgObl.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
//                Toast.makeText(holder.imgObl.getContext(),
//                "Пойдем читать " + position, Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(holder.imgObl.getContext(), SliderActivity.class);
                startActivity(intent);
            }
        });
    }

    @Override
    public int getItemCount() {
        return booksList.size();
    } //считает количество элементов в списке


    public static class ViewHolder extends RecyclerView.ViewHolder {

        ImageView imgObl;
        CardView cv;

        public ViewHolder(View itemView) {
            super(itemView);
            imgObl = (ImageView) itemView.findViewById(R.id.iv_recycler_item);
            cv = (CardView) itemView.findViewById(R.id.card_view);
        }
    }

}

I want after a click on the OK button the MenuActivity to be shown. I have already searched on the Internet to find an answer and tried everything. I haave the activity declared in the AndroidManifest and I also tried to use Intent(this, MenuActivity.class) and also the one with the action inside but it doesn’t work.

MainActivity:

package  com.jamesjohnson.chronos;

import  android.app.AlertDialog;
import  android.app.Activity;
import  android.content.ActivityNotFoundException;
import  android.content.DialogInterface;
import  android.content.Context;
import  android.content.Intent;
import  android.support.v7.app.ActionBarActivity;
import  android.os.Bundle;
import  android.util.Log;
import  android.view.*;
import  android.view.Menu;
import  android.view.MenuItem;
import  android.view.View;
import  android.view.View.OnClickListener;
import  android.widget.Button;
import  com.jamesjohnson.chronos.R;


public  class MainActivity extends  ActionBarActivity implements  OnClickListener {

private static final  String TAG =  "MainActivity";

@Override
protected  void onCreate(Bundle savedInstanceState)  {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
     this.setTitle("Willkommen");
     Button button = (Button)  findViewById(R.id.button);
     button.setOnClickListener(this);
}

@Override
public  boolean onCreateOptionsMenu(Menu menu)  {
    // Inflate the menu; this adds  items to the action bar if it is  present.
     getMenuInflater().inflate(R.menu.menu_main,  menu);
    return  true;
}

@Override
public boolean  onOptionsItemSelected(MenuItem item) {
     // Handle action bar item clicks here.  The action bar will
    // automatically  handle clicks on the Home/Up button, so  long
    // as you specify a parent  activity in AndroidManifest.xml.
    int  id = item.getItemId();

     //noinspection SimplifiableIfStatement
     switch(id) {
        case  R.id.action_mainmenu:
             startActivity(new  Intent("com.jamesjohnson.chronos.MenuActivity"));
             return true;
        case  R.id.action_settings:
             showMessageBox("Es gibt leider noch  keine Einstellungen. Wir arbeiten  daran!", true, true);
            return  true;

    }

    return  super.onOptionsItemSelected(item);
}

@Override
public  void onClick(View v) {
    try {
         Intent intent = new  Intent(MainActivity.this,  MenuActivity.class);
        Context ctx  = this;
        intent.setClassName(ctx,  "com.jamesjohnson.chronos.MenuActivity");
          intent.setAction("com.jamesjohnson.chronos.MenuActivity");
         if ((intent.getAction() ==  "com.jamesjohnson.chronos.MenuActivity")  || (intent.getClass() != null)) {
              MainActivity.this.startActivity(intent);
             showMessageBox("Button has  been pressed " + intent.toString(),  true, true);
        }
        else {
             showMessageBox("Error :  Hauptmenü ist nicht erreichbar",  true, true);
        }
    }
    catch  (ActivityNotFoundException an) {
         showMessageBox("Error :" +  an.getMessage(), true, true);
    }
     catch (Exception e) {
         showMessageBox("Error :" +  e.getMessage(), true, true);
     }
}

protected void  showMessageBox(String message, boolean  showOKbutton, boolean canceable) {
     AlertDialog.Builder dlgAlert = new  AlertDialog.Builder(MainActivity.this);

     dlgAlert.setMessage(message);
     dlgAlert.setTitle("Chronos");
    if  (showOKbutton) {
         dlgAlert.setPositiveButton("OK", null);
     }
    if (canceable) {
         dlgAlert.setCancelable(true);
    }
     dlgAlert.create().show();
}
}

Here’s my AndroidManifest:

<?xml version="1.0"  encoding="utf-8"?>
<manifest  xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.jamesjohnson.chronos"
     android:versionCode="1"
     android:versionName="1.0.1
    " >

     <application

         android:allowBackup="true"
         android:debuggable="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme"  >
        <activity
             android:name=".MainActivity"
             android:label="@string/app_name" >
             <intent-filter>
                 <action  android:name="android.intent.action.MAIN"  />

                <category  android:name="android.intent.category.LAUNCHER"  />
             </intent-filter>
         </activity>
        <activity
             android:name=".MenuActivity"
              android:label="@string/title_activity_menu"
              android:parentActivityName=".MainActivity"  >
            <intent-filter>
                 <action  android:name="com.jamesjohnson.chronos.MenuActivity"  />

                <category  android:name="android.intent.category.DEFAULT"  />
             </intent-filter>
             <!-- Parent activity meta-data to  support 4.0 and lower -->
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"
                  android:value="com.jamesjohnson.chronos.MainActivity"  />
        </activity>
     </application>

</manifest>

And finally here’s the MenuActivity:

package  com.jamesjohnson.chronos;

import  android.app.AlertDialog;
import  android.app.ListActivity;
import  android.os.Bundle;
import  android.view.Menu;
import  android.view.MenuItem;
import  android.view.View;
import  android.widget.AdapterView;
import  android.widget.AdapterView.OnItemClickListener;
import  android.widget.ArrayAdapter;
import  android.widget.ListView;


public class  MenuActivity extends ListActivity {

     private static final String TAG =  "MenuActivity";
    static final  String[] ENTRIES = new String[]  {"Kunden", "Projekte", "Leistungen",  "Zeiten"};
    ListView listView =  getListView();

    @Override
     protected void onCreate(Bundle  savedInstanceState) {
         showMessageBox("Activity is beeing  created", true, true);
         super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_menu);
          this.setTitle("Hauptmenü");
         this.setListAdapter(new  ArrayAdapter<String>(this,  android.R.layout.simple_list_item_1,  ENTRIES));
         listView.setOnItemClickListener(new  OnItemClickListener(){
           public  void onItemClick(AdapterView<?>  parent, View view, int position, long  id) {
               switch (position)  {
                   case 0:
                        showMessageBox("Kunden",  true, true);
                        break;
                   case 1:
                         showMessageBox("Projekte", true, true);
                        break;
                    case 2:
                        showMessageBox("Leistungen", true,  true);
                       break;
                    case 3:
                        showMessageBox("Zeiten", true,  true);
                       break;
                    default:
                        showMessageBox("Error: Undefined  index", true, true);
               }
            }
        });
    }


     @Override
    public boolean  onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to  the action bar if it is present.
         getMenuInflater().inflate(R.menu.menu_menu,  menu);
        return true;
    }

     @Override
    public boolean  onOptionsItemSelected(MenuItem item) {
         // Handle action bar item clicks  here. The action bar will
        //  automatically handle clicks on the  Home/Up button, so long
        // as  you specify a parent activity in  AndroidManifest.xml.
        int id =  item.getItemId();

         //noinspection SimplifiableIfStatement
         if (id == R.id.action_settings) {
             return true;
        }

         return  super.onOptionsItemSelected(item);
     }

    protected void  showMessageBox(String message, boolean  showOKbutton, boolean canceable) {
         AlertDialog.Builder dlgAlert = new  AlertDialog.Builder(MenuActivity.this);

         dlgAlert.setMessage(message);
         dlgAlert.setTitle("Chronos");
         if (showOKbutton) {
             dlgAlert.setPositiveButton("OK", null);
         }
        if (canceable) {
             dlgAlert.setCancelable(true);
         }
        dlgAlert.create().show();
     }
}

Unfortunately I can’t show you my Logcat because it doesn’t work on my computer. (I always have to export the APK to test the App).

P.S. I am working with Android Studio 1.0.1
…Please HELP ME !

28

Answers 1 : of The startactivity(intent) method causes an error. Why

Intent intent = new  Intent(v.getContext(),  MenuActivity.class);
startActivity(intent);

@Override
public void onClick(View v) {
     Intent intent = new  Intent(v.getContext(),  MenuActivity.class);
     startActivity(intent);
}

2023-09-18T17:51:13+00:00 2023-09-18T17:51:13+00:00Answer Link

mRahman

6

Answers 2 : of The startactivity(intent) method causes an error. Why

private Context context;

@Override
     protected void onCreate(Bundle  savedInstanceState) {
      context =  this;
      //rest of your code here
     }

Intent intent = new Intent(context,  MenuActivity.class);
//Something  else
context.startActivity(intent);

2023-09-18T17:51:13+00:00 2023-09-18T17:51:13+00:00Answer Link

raja

6

Answers 3 : of The startactivity(intent) method causes an error. Why

android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">

2023-09-18T17:51:13+00:00 2023-09-18T17:51:13+00:00Answer Link

raja

2

Answers 4 : of The startactivity(intent) method causes an error. Why

<activity  android:name=".MenuActivity"/>

Intent intent = new  Intent(v.getContext(),  MenuActivity.class);
startActivity(intent);

2023-09-18T17:51:13+00:00 2023-09-18T17:51:13+00:00Answer Link

raja

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