CODEWITHSUNDEEP
android
yakusha
yakusha

Reputation: 815

Start Intent in Adapter

I want to start a new activity from this base adapter. 

public class EfficientAdapter extends BaseAdapter {

    private Activity activity;
    private ArrayList<ComptePost> data;
    private static LayoutInflater inflater = null;
    public ImageLoader imageLoader; 
    public  Boolean isActusAstuce;
    public static int flag = 0, counter=0;

    private Context context;

    public EfficientAdapter(Context context) {
        this.context = context;     
    }

    NVirementEmmeteur main;

    int num = 0;

    ViewHolder holder;
    static String src;

    public EfficientAdapter(Activity a, ArrayList<ComptePost> d) {
        activity = a;
        data = d;
        inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        //  imageLoader = new ImageLoader(activity.getApplicationContext());
        imageLoader=new ImageLoader(activity.getApplicationContext());
    }

    public EfficientAdapter(NVirementEmmeteur m) {
        main = m;
    }

    @Override
    public int getCount() {
        return data.toArray().length;
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    public static class ViewHolder {
        public TextView one;
        public TextView two;
        public TextView three;
        public ImageView image;
        public RelativeLayout relative_layout;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        View vi = convertView;
        holder.relative_layout.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                v.getContext().startActivity(new Intent(context, NVirementEmmeteur.class)); 
            }
        });
        return vi;
    }
}

I tried 

context.startActivity(new Intent(context, NVirementEmmeteur.class));

and 

v.getContext().startActivity(new Intent(context, NVirementEmmeteur.class));

but it force closes my application.

The intent should launch inside an onclicklistener() from the list adapter. Can someone tell me how to launch an intent from my efficientadapter.class please.

Here is my logcat output:

04-11 10:07:50.878: E/AndroidRuntime(11179): FATAL EXCEPTION: main 04-11 10:07:50.878: E/AndroidRuntime(11179): java.lang.NullPointerException 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.content.ComponentName.(ComponentName.java:75) 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.content.Intent.(Intent.java:2863) 04-11 10:07:50.878: E/AndroidRuntime(11179): at.adapter.EfficientAdapter$1.onClick(EfficientAdapter.java:141) 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.view.View.performClick(View.java:2538) 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.view.View$PerformClick.run(View.java:9152) 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.os.Handler.handleCallback(Handler.java:587) 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.os.Handler.dispatchMessage(Handler.java:92) 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.os.Looper.loop(Looper.java:130) 04-11 10:07:50.878: E/AndroidRuntime(11179): at android.app.ActivityThread.main(ActivityThread.java:3687) 04-11 10:07:50.878: E/AndroidRuntime(11179): at java.lang.reflect.Method.invokeNative(Native Method) 04-11 10:07:50.878: E/AndroidRuntime(11179): at java.lang.reflect.Method.invoke(Method.java:507) 04-11 10:07:50.878: E/AndroidRuntime(11179): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 04-11 10:07:50.878: E/AndroidRuntime(11179): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 04-11 10:07:50.878: E/AndroidRuntime(11179): at dalvik.system.NativeStart.main(Native Method)

Upvotes: 20

Views: 87069

Answers (10)

Samiya Khan
Samiya Khan

Reputation: 369

Java: Intent in Adapter

Intent intent = new Intent(context, MainActivity.class);
intent.putExtra("position", position);
context.startActivity(intent);

Accessing Intent Value

Bundle extras = getIntent().getExtras();
position = (getIntent().hasExtra("position") && extras != null) ? extras.getInt("position") : 0;

Kotlin: Intent in Adapter

val context = holder.itemView.context

val intent = Intent(context, MainActivity::class.java)
intent.putExtra("title", holder.button.text.toString())
context.startActivity(intent)

Accessing Intent Value in Kotlin

val letterId = intent?.extras?.getString("letter").toString()

Upvotes: 1

Esterified
Esterified

Reputation: 93

you can simply get the context from View v or any other created views inside the adapter class using getContext().

// TODO Auto-generated method stub
v.getContext().startActivity(new Intent(v.getContext(), NVirementEmmeteur.class));

Upvotes: 2

Srinivas
Srinivas

Reputation: 31

Replace onClick method with this it may work I didn't tried:

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

Upvotes: 3

Hamza Polat
Hamza Polat

Reputation: 375

I faced this problem previously and tried all of the suggestions above, but the only one helped me to start an activity from an adopter was the solution proposed by @Md. Sajedul Karim.

I modified the code and used like this

Intent intent = new Intent(context, NesneTani.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);

Upvotes: 9

Md. Sajedul Karim
Md. Sajedul Karim

Reputation: 7075

Pass Context via Constructor and then just use this line of code:

Intent intent=new Intent(context.getApplicationContext(), YourActivity.class);
  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
  context.getApplicationContext().startActivity(intent);

Thanks :)

Upvotes: 2

Akilan
Akilan

Reputation: 934

set clickListener on listview in mainactivity from there start the intent

    lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener()
{
@Override public void onItemClick(AdapterView<?> arg0, View arg1,int position, long arg3)
{ 
    Intent intent = new Intent(getActivity,Test.class);
startActivity(intent);
}
});

Upvotes: 0

Dhaval Parmar
Dhaval Parmar

Reputation: 18978

you have passed context of activity in constructor so you can also use;

activity.startActivity(new Intent(activity, NVirementEmmeteur.class));

check here is sample code you get idea what to do:

setadapter like : adapter = new MyArrayAdapter(MainActivity.this, COUNTRIES);

adapter code:

package com.example.testapp;

import com.example.main.util.testActivity;

import android.content.Context;
import android.content.Intent;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

class MyArrayAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private Context mcon;
    private String[] COUNTRIES_;

    public MyArrayAdapter(Context con, String[] countries) {
        // TODO Auto-generated constructor stub
        mcon = con;
        COUNTRIES_ = countries;
        mInflater = LayoutInflater.from(con);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return COUNTRIES_.length;
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        final ListContent holder;
        View v = convertView;
        if (v == null) {
            v = mInflater.inflate(R.layout.my_spinner_style, null);
            holder = new ListContent();
            holder.line = (LinearLayout) v.findViewById(R.id.line_);
            holder.name = (TextView) v.findViewById(R.id.textView1);
            holder.name1 = (TextView) v.findViewById(R.id.textView2);
            holder.name2 = (ImageView) v.findViewById(R.id.imageView1);

            v.setTag(holder);
        } else {

            holder = (ListContent) v.getTag();
        }

        holder.name.setText("" + Html.fromHtml("" + COUNTRIES_[position]));
        holder.name1.setText("" + Html.fromHtml("" + COUNTRIES_[position]));

        holder.line.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                mcon.startActivity(new Intent(mcon, testActivity.class));
            }
        });

        return v;
    }

}

class ListContent {

    TextView name;
    TextView name1;
    ImageView name2;
    LinearLayout line;

}

Edited:

if your are use this constructor: then list.setadapter(new EfficientAdapter(myactivity.this));

public EfficientAdapter(Context context) {
          this.context = context;     
     }

then use : context.startActivity(new Intent(context, NVirementEmmeteur.class));

if you use this construdtor list.setadapter(new EfficientAdapter(myactivity.this, ComptePostarray));

public EfficientAdapter(Activity a, ArrayList<ComptePost> d) {

        activity = a;
        data = d;
        inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    //  imageLoader = new ImageLoader(activity.getApplicationContext());
        imageLoader=new ImageLoader(activity.getApplicationContext());
    }

then use activity.startActivity(new Intent(activity, NVirementEmmeteur.class));

Hope you understud....

Upvotes: 27

Ankitkumar Makwana
Ankitkumar Makwana

Reputation: 3485

also you can do like, Here mContext is Your BaseAdpter Context Object

 Intent ieventreport = new Intent(mContext,Your.class);   
 mContext.startActivity(ieventreport);

change your Constructer like, initialise

 public EfficientAdapter(Context context, ArrayList<ComptePost> d){
}

Upvotes: 8

RobinHood
RobinHood

Reputation: 10969

Pass activity context from activity and use same context while calling Intent.

From activity:

yourview.setAdapter(new EfficientAdapter(this));

within adapter:

 private Context mContext;


  public EfficientAdapter(Context c) {
        mContext = c;

    }

Now use mContext to call Intent.

startActivity(new Intent(mContext, NVirementEmmeteur.class));

Upvotes: 0

Viswanath Lekshmanan
Viswanath Lekshmanan

Reputation: 10083

Set an intent for the class u need to open.In manifest file . Eg:

<activity android:name=".openingclass"
android:label="@string/app_name">
 <intent-filter>
 <action android:name="android.intent.action.OPEN" />
 <category android:name="android.intent.category.DEFAULT" />
 </intent-filter>
 </activity>

Then

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
           Intent i=new Intent("android.intent.action.OPEN");
           StartActivity(i);
                  }

Upvotes: 1

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