onClick on Cardview get from firebase

Question

I did this at my newsviewholder:

    public class NewsViewHolder extends RecyclerView.ViewHolder {

    View mView;
    Context context;

    public NewsViewHolder(final View itemView) {
        super(itemView);
        mView = itemView;
        itemView.setOnClickListener(new View.OnClickListener() {

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

    public void setTitular(String titular) {
        TextView post_titular = (TextView) mView.findViewById(R.id.titleText);
        post_titular.setText(titular);
    }

    public void setImage(Context ctx, String image){
        ImageView post_image = (ImageView) mView.findViewById(R.id.imageView);
        Picasso.with(ctx).load(image).into(post_image);
    }
}

The problem its when I do onClick in the cardview It throws the next error:

E/AndroidRuntime: FATAL EXCEPTION: main Process: es.laramira.atellez.moroninfo, PID: 5200 android.content.ActivityNotFoundException: Unable to find explicit activity class {es.laramira.atellez.moroninfo/es.laramira.atellez.moroninfo.Fragments.DetalleFragment}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1805) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1523) at android.app.Activity.startActivityForResult(Activity.java:4224) at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79) at android.app.Activity.startActivityForResult(Activity.java:4183) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859) at android.app.Activity.startActivity(Activity.java:4507) at android.app.Activity.startActivity(Activity.java:4475) at es.laramira.atellez.moroninfo.Models.NewsViewHolder$1.onClick(NewsViewHolder.java:32) at android.view.View.performClick(View.java:5610) at android.view.View$PerformClick.run(View.java:22265) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

And Ive in my AndroidManifest.xml defined the new activity, but I dont know how to solve this...

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="es.laramira.atellez.moroninfo">

    <uses-permission android:name="android.permission.INTERNET" />

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".ActivityDetalle"></activity>
    </application>

</manifest>

Ive tried a lot of answer found in Stackoverflow and in other sites but I cant solve this...

Answer 1

You're starting the Fragment, instead of your activity.

new Intent(view.getContext(), DetalleFragment.class);

But you can't use context.startActivity for a fragment.

If you want to start your "ActivityDetalle", as I see in your Manifest, replace the call with

new Intent(view.getContext(), ActivityDetalle.class);

Edit:

If you want to start the activity from a context, that does not belong to an activity, you have to add the intent flag Intent.FLAG_ACTIVITY_NEW_TASK

Answer 2

Initialise the context in adapter either via calling a constructor like

public MyAdapter(Context c) {
        this.c=c;

}

and call the constructor in your activity when you are initialising adapter like

MyAdapter adaoter = new MyAdapter(this);

so that your Context will not be empty!

Answer 3

Your Context c; is never initialised so

View v= LayoutInflater.from(c).inflate(R.layout.activity_detalle,parent,false);
            return new NewsViewHolder(v);

returns null.

Update.

As I understood you just want to assign onClickListener to an item.

Creating and setting another adapter won't solve your problem. I would say that is totally wrong way.

To add onClickListener to your card you need to edit NewsViewHolder:

public NewsViewHolder(View itemView) {
...
itemView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //your stuff
    }
...
});

Update.

Unfortunately, stackoverflow is a place where you can get an answer for concrete question, rather than "I insert some code, it still does not work". It is a waste of time. First of all you must learn how to read logs and debug.

Here are some resources to start with:

https://www.udacity.com/course/developing-android-apps--ud853 https://commonsware.com/Android/