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Android Intents and Broadcast Receivers For All Intents and Purposes Intentional Practice

Posted by Darnell Cephus
Darnell Cephus
4,208 Points

I have key and string parameters, why the error?

I have key and string parameters, why the error?

MainActivity.java 
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
    public static final String EXTRA_YEAR = "EXTRA_YEAR";
  public Button goButton;
  public EditText yearField;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    goButton = (Button)findViewById(R.id.goButton);
    yearField = (EditText)findViewById(R.id.yearField);

    goButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        // Add your code in here!
        Intent intent = new Intent(MainActivity.this, TimeTravelActivity.class);
        intent.putExtra(EXTRA_YEAR, yearField.getText());
        startActivity(intent);

      }
    });
  }
}
TimeTravelActivity.java 
import android.os.Bundle;
import android.view.View;

public class TimeTravelActivity extends Activity {

  public String targetYear;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_time_travel);



  }
}

2 Answers

Simon Coates
Simon Coates
28,694 Points
Simon Coates
Simon Coates
28,694 Points

For any future users, the following seems to pass the challenge completely:

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

  public Button goButton;
  public EditText yearField;
  public static final String EXTRA_YEAR = "EXTRA_YEAR";

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    goButton = (Button)findViewById(R.id.goButton);
    yearField = (EditText)findViewById(R.id.yearField);

    goButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          Intent intent = new Intent(MainActivity.this,TimeTravelActivity.class);
          String year = new String();
          year = yearField.getText().toString();

          intent.putExtra(EXTRA_YEAR, year);
          startActivity(intent);
      }
    });
  }
}

and

import android.os.Bundle;
import android.view.View;

public class TimeTravelActivity extends Activity {

  public String targetYear;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_time_travel);    
    targetYear = getIntent().getStringExtra(MainActivity.EXTRA_YEAR );
  }
}
Seth Kroger
Seth Kroger
56,414 Points
Seth Kroger
Seth Kroger
56,414 Points

It's one of those tricky points of Android, but EditText.getText() doesn't quite give you a String. It gives you something called an Editable and you have to use toString() on it to get a true String.

Darnell Cephus
Darnell Cephus
4,208 Points

I'm trying to get use to thinking logically about this...but this was the correct answer. Correct me if I'm wrong Seth lol

..... goButton.setOnClickListener(new View.OnClickListener() {

  @Override

  public void onClick(View v) {

    // Add your code in here!

    Intent intent = new Intent(MainActivity.this,TimeTravelActivity.class);
    String year = new String();
    year = yearField.getText().toString();

    intent.putExtra(EXTRA_YEAR, year);
    startActivity(intent);

  }
});

}