다른 XML 파일의 미리 정의 된 행을 사용하는 SimpleAdapter
을 사용하여 다른 활동의 ListView에 EditText의 데이터를 저장하려고합니다. 이 모든 것은 Save Todo
버튼에 정의되어 있습니다. 모든 것이 잘 작동하지만 데이터를 저장할 때 null 포인터 오류가 발생합니다. 이미지 http://i.imgur.com/k95cilO.png단순 어댑터 널 포인터
import java.util.ArrayList;
import java.util.HashMap;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
public class Add_Item extends ActionBarActivity {
//variables
EditText TaskNameET;
Spinner SpinType;
Button SaveTodo;
String SpinnerOptions[] = {"OptionOne", "OptionTwo", "OptionThree"};
SimpleAdapter ListAdapt;
//call mainactivity class
MainActivity Main;
//declare arraylist and HashMap
ArrayList<HashMap<String, String>> mylist;
HashMap<String, String> map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add__item);
//define vars
TaskNameET = (EditText) findViewById(R.id.TaskNameET);
SpinType = (Spinner) findViewById(R.id.spinner1);
SaveTodo = (Button) findViewById(R.id.button1);
//initialize mylist and map
mylist = new ArrayList<HashMap<String, String>>();
map = new HashMap<String, String>();
//SimpleAdapter
ListAdapt = new SimpleAdapter(this, mylist, R.layout.row, new String[] {"columnone", "columntwo", "columnthree"}, new int[] {R.id.columnone, R.id.columntwo, R.id.columnthree});
//adapter for spinner
ArrayAdapter<String> ard=new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line, SpinnerOptions);
SpinType.setAdapter(ard);
//onclick todobutton
SaveTodo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
map.put("columnone", Add_Item.this.TaskNameET.getText().toString());
map.put("columntwo", Add_Item.this.TaskNameET.getText().toString());
map.put("columnthree", Add_Item.this.TaskNameET.getText().toString());
mylist.add(map);
Main.MainList.setAdapter(ListAdapt);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.add__item, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
//R.layout Add_Item의 XML
<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: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="com.example.moduleonesimpleapplication.Add_Item" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:textSize="30sp"
android:text="@string/TitleText"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/TaskNameET"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="34dp"
android:ems="10"
android:inputType="text" >
<requestFocus />
<requestFocus />
</EditText>
<Spinner
android:id="@+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_alignRight="@+id/TaskNameET"
android:layout_below="@+id/TaskNameET"
android:layout_marginTop="27dp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/TaskNameET"
android:layout_alignParentLeft="true"
android:text="@string/TaskNameTXT" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_below="@+id/textView3"
android:layout_marginTop="48dp"
android:text="@string/TaskDateTXT" />
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView4"
android:layout_alignBottom="@+id/textView4"
android:layout_alignLeft="@+id/spinner1"
android:ems="10"
android:inputType="date" >
</EditText>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@+id/editText2"
android:text="@string/SaveButton" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/spinner1"
android:layout_alignLeft="@+id/textView2"
android:layout_marginBottom="19dp"
android:text="@string/TaskTypeTxT" />
</RelativeLayout>
//R.layout Row.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/columnone"
android:layout_width="100dip"
android:layout_height="wrap_content"
android:textColor="#C0C0C0"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/columntwo"
android:layout_width="100dip"
android:layout_height="wrap_content"
android:textColor="#C0C0C0"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/columnthree"
android:layout_width="120dip"
android:layout_height="wrap_content"
android:textColor="#C0C0C0"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
'Main.MainList.setAdapter'가 무엇을 기대하는지 모르겠지만 이것이 작동하는지 의심 스럽습니다. – njzk2
MainActivity.java 파일 – ssj3goku878
의 listview에 어댑터의 저장된 데이터를 추가한다고 가정합니다. 상호 활동 커뮤니케이션은 그보다 약간 더 복잡합니다. – njzk2