Java Android中使用SharedReferences的动态列表
我正在开发一个需要创建动态列表的项目。为此,我使用共享首选项将值永久存储在列表中。但当我重新启动项目时,输入的值不会退出。我尝试了很多次,但问题没有解决。Java Android中使用SharedReferences的动态列表,java,android,listview,dynamic,sharedpreferences,Java,Android,Listview,Dynamic,Sharedpreferences,我正在开发一个需要创建动态列表的项目。为此,我使用共享首选项将值永久存储在列表中。但当我重新启动项目时,输入的值不会退出。我尝试了很多次,但问题没有解决。 这是我的代码。 numberlistativity.java public class NumberListActivity extends Activity { ListView numList; ArrayList<String> list = new ArrayList<String>();
这是我的代码。
numberlistativity.java
public class NumberListActivity extends Activity {
ListView numList;
ArrayList<String> list = new ArrayList<String>();
ArrayAdapter<String> adapter;
public static final String Place = "placeKey";
Button btnAdd;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_list);
numList = (ListView) findViewById(R.id.list);
btnAdd = (Button) findViewById(R.id.btnAdd);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, list);
numList.setAdapter(adapter);
btnAdd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
SharedPreferences preferences = getSharedPreferences("place",
Context.MODE_PRIVATE);
SharedPreferences.Editor spEditor = preferences.edit();
EditText edit = (EditText) findViewById(R.id.txtItem);
spEditor.putString("Value", edit.getText().toString());
spEditor.commit();
list.add(preferences.getString("Value", ""));
adapter.notifyDataSetChanged();
}
});
list.toArray();
}
}
public class numberStactivity扩展活动{
列表视图numList;
ArrayList=新建ArrayList();
阵列适配器;
公共静态最终字符串Place=“placeKey”;
按钮btnAdd;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
//TODO自动生成的方法存根
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_列表);
numList=(ListView)findViewById(R.id.list);
btnAdd=(按钮)findviewbyd(R.id.btnAdd);
适配器=新阵列适配器(此,
android.R.layout.simple_list_item_1,list);
numList.setAdapter(适配器);
setOnClickListener(新的OnClickListener(){
@凌驾
公共void onClick(视图v){
//TODO自动生成的方法存根
SharedReferences首选项=GetSharedReferences(“位置”,
上下文。模式(私人);
SharedReferences.Editor spEditor=preferences.edit();
EditText edit=(EditText)findViewById(R.id.txtItem);
putString(“Value”,edit.getText().toString());
提交();
添加(preferences.getString(“Value”和“));
adapter.notifyDataSetChanged();
}
});
list.toArray();
}
}
custom_list.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<EditText
android:id="@+id/txtItem"
android:layout_width="240dp"
android:layout_height="wrap_content"
android:inputType="text" />
<Button
android:id="@+id/btnAdd"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/txtItem" />
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/txtItem" />
<TextView
android:id="@+id/empty"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/txtItem"
android:gravity="center_horizontal" />
</RelativeLayout>
试试这个
SharedPreferences preferences;
SharedPreferences.Editor spEditor;
int count = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_list);
preferences = getSharedPreferences("place", Context.MODE_PRIVATE);
spEditor = preferences.edit();
count = preferences.getInt("count", 0);
if(count > 0){
for(int i = 0; i < count; i++){
list.add(preferences.getString("Value["+i+"]", ""));
}
}
numList = (ListView) findViewById(R.id.list);
btnAdd = (Button) findViewById(R.id.btnAdd);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, list);
numList.setAdapter(adapter);
btnAdd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
EditText edit = (EditText) findViewById(R.id.txtItem);
spEditor.putString("Value["+count+"]", edit.getText().toString());
spEditor.commit();
list.add(preferences.getString("Value["+count+"]", ""));
count += 1;
spEditor.putInt("count", count);
adapter.notifyDataSetChanged();
}
});
}
SharedReferences首选项;
SharedReferences.Editor spEditor;
整数计数=0;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
//TODO自动生成的方法存根
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_列表);
首选项=GetSharedReferences(“地点”,Context.MODE\u PRIVATE);
spEditor=preferences.edit();
count=preferences.getInt(“count”,0);
如果(计数>0){
for(int i=0;i
@NirHartmann:这是在列表中存储值的完整代码。@NirHartmann:这两行将数据添加到列表中。**list.add(preferences.getString(“value”),“”);adapter.notifyDataSetChanged()**@ZiaUrRehman看看我的ans