How to open a different activity on recyclerView item onclick

Question

i am using a recyclerView to show my listitems in the navigation drawer.I have implemented the onclickListener but i have been stuck on how to open a different activity when items are clicked. All my items do on item click as of now as per the code is to display a toast with the item position.

I would appreciate the help.

AdapterClass.java

public class AdapterClass extends RecyclerView.Adapter<AdapterClass.MyViewHolder> {      private LayoutInflater inflater;      private Context context;  List<Information>data= Collections.emptyList();      public AdapterClass(Context context,List<Information>data){          this.context=context;            inflater= LayoutInflater.from(context);          this.data=data;      }      @Override      public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {         View view= inflater.inflate(R.layout.custom_row,parent,false);          MyViewHolder holder=new MyViewHolder(view);          return holder;      }        @Override      public void onBindViewHolder(MyViewHolder holder, int position) {          Information current=data.get(position);          holder.title.setText(current.title);          holder.icon.setImageResource(current.iconId);        }        @Override      public int getItemCount() {          return data.size();      }      class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{          TextView title;          ImageView icon;            public MyViewHolder(View itemView) {              super(itemView);              title=(TextView)itemView.findViewById(R.id.listText);             icon=(ImageView)itemView.findViewById(R.id.listIcon);              itemView.setClickable(true);              itemView.setOnClickListener(this);          }            @Override          public void onClick(View v) {                Toast.makeText(context,"The Item Clicked is: "+getPosition(),Toast.LENGTH_SHORT).show();          }      };  }

Log  cat error after implementing Konrad's solution      02-27 15:24:52.833: D/AndroidRuntime(1630): --------- beginning of crash 02-27 15:24:52.834: E/AndroidRuntime(1630): FATAL EXCEPTION: main 02-27 15:24:52.834: E/AndroidRuntime(1630): Process: com.snappy.stevekamau.snappy, PID: 1630 02-27 15:24:52.834: E/AndroidRuntime(1630): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.snappy.stevekamau.snappy/com.snappy.stevekamau.snappy.YourActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.ActivityThread.access$800(ActivityThread.java:144) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.os.Handler.dispatchMessage(Handler.java:102) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.os.Looper.loop(Looper.java:135) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.ActivityThread.main(ActivityThread.java:5221) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at java.lang.reflect.Method.invoke(Native Method) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at java.lang.reflect.Method.invoke(Method.java:372) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 02-27 15:24:52.834: E/AndroidRuntime(1630): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.support.v7.internal.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:95) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.support.v7.internal.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:88) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.support.v7.internal.app.ToolbarActionBar.<init>(ToolbarActionBar.java:84) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.support.v7.app.ActionBarActivityDelegateBase.setSupportActionBar(ActionBarActivityDelegateBase.java:175) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.support.v7.app.ActionBarActivity.setSupportActionBar(ActionBarActivity.java:92) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at com.snappy.stevekamau.snappy.YourActivity.onCreate(YourActivity.java:18) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.Activity.performCreate(Activity.java:5933) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) 02-27 15:24:52.834: E/AndroidRuntime(1630):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251) 02-27 15:24:52.834: E/AndroidRuntime(1630):     ... 10 more 02-27 15:24:52.839: W/ActivityManager(464):   Force finishing activity com.snappy.stevekamau.snappy/.YourActivity 02-27 15:24:52.841: W/ActivityManager(464):   Force finishing activity com.snappy.stevekamau.snappy/.MainActivity 

Answer 1

You can (but don't need to because the ViewHolder class is not static) create field context as is shown below:

private final Context context;  public MyViewHolder(View itemView) {     super(itemView);     context = itemView.getContext();     ... } 

and on your onClick method just call sth like below:

@Override public void onClick(View v) {                final Intent intent;     switch (getAdapterPostion()){         case 0:            intent =  new Intent(context, FirstActivity.class);            break;          case 1:             intent =  new Intent(context, SecondActivity.class);             break;            ...         default:            intent =  new Intent(context, DefaultActivity.class);            break;      }     context.startActivity(intent); } 

or

@Override public void onClick(View v) {                final Intent intent;     if (getAdapterPosition() == sth){        intent =  new Intent(context, OneActivity.class);     } else if (getPosition() == sth2){        intent =  new Intent(context, SecondActivity.class);     } else {        intent =  new Intent(context, DifferentActivity.class);     }     context.startActivity(intent); } 

Answer 2

Simply you can do it easy... You just need to get the context of your activity, here, from your View.

//Create intent getting the context of your View and the class where you want to go Intent intent = new Intent(view.getContext(), YourClass.class);  //start the activity from the view/context view.getContext().startActivity(intent); //If you are inside activity, otherwise pass context to this funtion 

Remember that you need to modify AndroidManifest.xml and place the activity...

<activity         android:name=".YourClass"         android:label="Label for your activity"></activity>