Question

First off, i’ll post a picture to make it easier for you guys to understand.

As you can see, there’s an EditText and a button.
I want the button to save the contents of the EditText into a string + start a new activity.

In the next activity, i then want to convert the string into an Integer.

This is my current code:

SENDER ACTIVITY

        startscore = (EditText) findViewById(R.id.startscore);

proceed = (Button) findViewById(R.id.bProceed);
proceed.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {

        Intent myIntent = new Intent(Introscreen.this, BillardScoreboardActivity.class);
        String s = startscore.getText().toString();
        Bundle b = new Bundle();
        b.putString("lol", s);
        //put into your intent
        myIntent.putExtras(b);
        Introscreen.this.startActivity(myIntent);

    }
}); 
}

RECEIVER ACTIVITY

        int counter1, counter2, counter3, counter4, counter5;

            oncreate.....{

            Bundle b = getIntent().getExtras();
    String s = b.getString("lol");




    column1tv = (TextView) findViewById(R.id.column1text);
    column2tv = (TextView) findViewById(R.id.column2text);
    column3tv = (TextView) findViewById(R.id.column3text);
    column4tv = (TextView) findViewById(R.id.column4text);
    column5tv = (TextView) findViewById(R.id.column5text);

    column1tv.setText(counter1);
    column2tv.setText(counter2);
    column3tv.setText(counter3);
    column4tv.setText(counter4);
    column5tv.setText(counter5);

Hope you can help me troubleshooting it, to figure out the problem.

The problem:

Upon clicking the button, it shuts down the application and gives me those error codes:

02-23 15:01:24.136: E/AndroidRuntime(295): FATAL EXCEPTION: main

java.lang.RuntimeException: Unable to start activity
ComponentInfo{inno.games/inno.games.BillardScoreboardActivity}:
java.lang.NumberFormatException: unable to parse '' as integer

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)

at android.app.ActivityThread.access$2300(ActivityThread.java:125)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)

at android.os.Handler.dispatchMessage(Handler.java:99)

at android.os.Looper.loop(Looper.java:123)

at android.app.ActivityThread.main(ActivityThread.java:4627)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:521)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.NumberFormatException: unable to parse '' as integer

at java.lang.Integer.parseInt(Integer.java:412)

at java.lang.Integer.parseInt(Integer.java:382)

at inno.games.BillardScoreboardActivity.onCreate(BillardScoreboardActivity.java:35)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

... 11 more

Answer 1

It’s breaking while trying to convert an empty string to an integer. Something is wrong while passing your string to the next activity. Try passing your string extra through a bundle instead:

Bundle b = new Bundle();
b.putString("key", string);
//put into your intent
yourIntent.putExtras(b);

Then get it in your next activity:

Bundle b = getIntent().getExtras();
String s = b.getString("key");

You also do need to switch your declarations of your TextViews and when you set them. You can’t set them if they are not yet declared.

Edit: One more thing. I’m assuming you only want integers typed into that EditText. You should set the inputType on it, if you haven’t already.

Edit 2: Don’t feel retarded, we were all beginners at one point! Firstly, try using a bundle and see if what you type into your EditText is properly passed to the next activity.

Second, you set the inputType for the EditText in your XML file. Should be something like android:inputType="number".

The declarations are these lines:

column1tv = (TextView) findViewById(R.id.column1text);

You’re creating an object for your TextViews. Then, you set them here:

column1tv.setText(counter1);

You must create and instantiate the object before you can do anything with it.

Edit 3:
Okay, from the screenshot you posted, I gathered the following:

First- You’re creating the objects counter1, counter2, etc.. but you’re never instantiating them with anything. Which is probably where you’re getting your latest exception.

Second- You’re getting the warning on the String s = b.getString("lol"); because it’s an unused local variable. (Check the problems tab in Eclipse and you’ll see what the warnings/problems you have in your code). You’re not doing anything with the string value that was passed from the previous activity.