【发布时间】：2014-12-31 19:41:25
【问题描述】：
单击微调器项目需要显示弹出窗口但未显示，只有我可以看到 toast 通知。
日志：system.err java.lang.IllegalStateException：系统服务在 onCreate() 之前对活动不可用
下面是我的代码
MainActivity.java
package com.example.newapplication;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.Spinner;
import com.example.newapplication.service;
public class MainActivity extends Activity {
Button btnClosePopup;
//Button OpenPopup;
ArrayList array;
service ser = new service(array);
Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner) findViewById(R.id.spinner1);
/*OpenPopup = (Button) findViewById(R.id.button1);
OpenPopup.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
initiatepopupwindow();
}
});
*/
array = ser.getArrayList();
Log.d("TAG","" +array);
//for(int i=0;i<array.length();i++){
//}
ArrayAdapter<String> dataadapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, array);
dataadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataadapter);
addListenerOnSpinnerItemSelected();
}
private PopupWindow pwindo;
private void addListenerOnSpinnerItemSelected() {
// TODO Auto-generated method stub
spinner.setOnItemSelectedListener(new CustomOnItemSelectedListener());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void initiatepopupwindow() {
// TODO Auto-generated method stub
try{
Log.d("TAG", "" +"Inside popupwindow");
LayoutInflater inflater = (LayoutInflater) MainActivity.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.screen_popup,
(ViewGroup) findViewById(R.id.popup_element));
pwindo = new PopupWindow(layout, 300, 370, true);
pwindo.showAtLocation(layout, Gravity.CENTER, 0, 0);
btnClosePopup = (Button) layout.findViewById(R.id.btn_close_popup);
btnClosePopup.setOnClickListener(cancel_button_click_listener);
}
catch (Exception e) {
e.printStackTrace();
}
}
private OnClickListener cancel_button_click_listener = new OnClickListener() {
public void onClick(View v) {
pwindo.dismiss();
}
};
}
微调器事件的监听器。
CustomOnItemSelectedListener.java
package com.example.newapplication;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
import com.example.newapplication.MainActivity;
public class CustomOnItemSelectedListener implements OnItemSelectedListener{
MainActivity main = new MainActivity();
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos,
long id) {
// TODO Auto-generated method stub
main.initiatepopupwindow();
Toast.makeText(parent.getContext(), parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
screenpopup.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/popup_element"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#444444"
android:orientation="vertical"
android:padding="10sp" >
<TextView
android:id="@+id/txtView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5sp"
android:text="Hello!" />
<Button
android:id="@+id/btn_close_popup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Close" />
</LinearLayout>
activity_main 布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/lightbackground"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="23dp"
android:layout_marginTop="32dp"
android:text="Welcome to MyApp"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="21dp" />
</RelativeLayout>
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标签： java android spinner popupwindow