我正在做HelloSpinner教程,並且我在兩個區域(onCreate方法的第4行和第6行...我標記了它們)下獲得了錯誤標記,我無法弄清楚爲什麼?我已經使用了教程中的代碼,並且我沒有從他們的指示中變化。這裏是我的代碼...Android hellospinner教程
package com.android.HelloSpinner;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
public class Activity1 extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner) findViewById(*R.id*(<-this is an error).spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, (*R.array*(<-this is an error).planets_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
}
public class MyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> parent,
View view, int pos, long id) {
Toast.makeText(parent.getContext(), "The planet is " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView parent) {
// Do nothing.
}
}
}////end of class Activity1
這裏是我的佈局文件main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:padding="10dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:text="@string/planet_prompt"
/>
<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="@string/planet_prompt"
/>
</LinearLayout>
她是我的strings.xml文件從我的文件夾值
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="planet_prompt">Choose a planet</string>
<string-array name="planets_array">
<item>Mercury</item>
<item>Venus</item>
<item>Earth</item>
<item>Mars</item>
<item>Jupiter</item>
<item>Saturn</item>
<item>Uranus</item>
<item>Neptune</item>
</string-array>
</resources>
你看到的具體問題是什麼?我不知道你是否有編譯時或運行時問題。 –
嘗試重建項目。這有時幫助。或關閉/重新打開。 –