Hi I am a beginner in android app development.I have been trying to develop 2 spinners following this link. http://examples.javacodegeeks.com/android/core/ui/spinner/android-spinner-drop-down-list-example/
I am getting an error R cannot be resolved to a variable. my MainActivity.java looks like this.
package com.example.androidspinnerexample;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;
public class MainActivity extends Activity {
private Spinner spinner1, spinner2;
private Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addItemsOnSpinner2();
addListenerOnButton();
addListenerOnSpinnerItemSelection();
} // add items into spinner dynamically
public void addItemsOnSpinner2() {
spinner2 = (Spinner) findViewById(R.id.spinner2);
List list = new ArrayList();
list.add("Item 1");
list.add("Item 2");
list.add("Item 3");
list.add("Item 4");
ArrayAdapter dataAdapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item, list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(dataAdapter);
}
public void addListenerOnSpinnerItemSelection() {
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner1.setOnItemSelectedListener(new MyOnItemSelectedListener());
}
public void addListenerOnButton() {
spinner1 = (Spinner) findViewById(R.id.spinner1);
spinner2 = (Spinner) findViewById(R.id.spinner2);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"Result : " + "\nSpinner 1 : "+ String.valueOf(spinner1.getSelectedItem()) + "\nSpinner 2 : "+ String.valueOf(spinner2.getSelectedItem()),Toast.LENGTH_SHORT).show();
}
});
}
}
In my console i see this error as well. My Projects\AndroidSpinnerExample\res\menu\main.xml:6: error: Error: No resource found that matches the given name (at 'title' with value '@string/action_settings').
my main.xml looks like this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="@array/country_array"
android:prompt="@string/select"/>
<Spinner
android:id="@+id/spinner2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:prompt="@string/select2" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_label" />
</LinearLayout>
My R.java file is also missing. I tried googling all the solutions that wer posted in stack overflow so far but did not work. Can anyone plz take a look into it ? .
My strings.xml looks like this.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">AndroidSpinner</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="select">Choose a country</string>
<string name="select2">Choose an item</string>
<string name="button_label">Submit</string>
<string-array name="country_array">
<item>Greece</item>
<item>United Kingdom</item>
<item>Italy</item>
<item>France</item>
<item>Germany</item>
<item>Turkey</item>
<item>Poland</item>
<item>India</item>
</string-array>
</resources>
I could resolve my R variable issue but now my app doesnt open and it says that the app stopped.But my program is error free.
