Question

I am trying to implement an onItemClicklister() in which when an item is clicked, the text values are carried over from one activity to another. Below is the code snippet.

public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                String name = ((TextView) view.findViewById(R.id.title)).getText().toString();
                String cost = ((TextView) view.findViewById(R.id.artist)).getText().toString();
                String description = ((TextView) view.findViewById(R.id.duration)).getText().toString();

                // Starting new intent
                Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
                in.putExtra(KEY_TITLE, name);
                in.putExtra(KEY_ARTIST, cost);
                in.putExtra(KEY_DURATION, description);
                startActivity(in);

            }
        });

Next Activity

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.single_list_item);

        // getting intent data
        Intent in = getIntent();

        // Get JSON values from previous intent
        String name = in.getStringExtra(KEY_TITLE);
        String cost = in.getStringExtra(KEY_ARTIST);
        String description = in.getStringExtra(KEY_DURATION);

//         Displaying all values on the screen
        TextView lblName = (TextView) findViewById(R.id.name_label);
        TextView lblCost = (TextView) findViewById(R.id.email_label);
        TextView lblDesc = (TextView) findViewById(R.id.mobile_label);

        lblName.setText(name);
        lblCost.setText(cost);
        lblDesc.setText(description);
    }

But it throws a

E/AndroidRuntime(  626): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.eve_haps/com.example.eve_haps.SingleMenuItemActivity}: java.lang.NullPointerException
E/AndroidRuntime(  626):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
E/AndroidRuntime(  626):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
E/AndroidRuntime(  626):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
E/AndroidRuntime(  626):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
E/AndroidRuntime(  626):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  626):    at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(  626):    at android.app.ActivityThread.main(ActivityThread.java:4424)
E/AndroidRuntime(  626):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(  626):    at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(  626):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
E/AndroidRuntime(  626):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
E/AndroidRuntime(  626):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(  626): Caused by: java.lang.NullPointerException
E/AndroidRuntime(  626):    at com.example.eve_haps.SingleMenuItemActivity.onCreate(SingleMenuItemActivity.java:32)
E/AndroidRuntime(  626):    at android.app.Activity.performCreate(Activity.java:4465)
E/AndroidRuntime(  626):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
E/AndroidRuntime(  626):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

I dont seem know what the problem is.Thanks for your help in advance.

Answer 1

Un Comment following code line from SingleMenuItemActivity’s onCreate().

setContentView(R.layout.single_list_item);

I think your TextViews are null.

And NullPointerException comes from these lines,

lblName.setText(name);
lblCost.setText(cost);
lblDesc.setText(description);