Java 如何将状态保存到选中项?
我正在申请,但现在我遇到了一个问题。我希望无论我关闭应用程序还是从设备上按下后退按钮,复选框都保持选中状态。 这是我的密码Java 如何将状态保存到选中项?,java,android,checkbox,Java,Android,Checkbox,我正在申请,但现在我遇到了一个问题。我希望无论我关闭应用程序还是从设备上按下后退按钮,复选框都保持选中状态。 这是我的密码 package com.example.vreaucarnet; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android
package com.example.vreaucarnet;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
public class ActeA extends MainActivity2A {
private ListView mainListView;
private mItems[] itemss;
private ArrayAdapter<mItems> listAdapter;
ArrayList<String> checked = new ArrayList<String>();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.acte2a);
// Find the ListView resource.
mainListView = (ListView) findViewById(R.id.mainListView);
// When item is tapped, toggle checked properties of CheckBox and
// Planet.
mainListView
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View item,
int position, long id) {
mItems planet = listAdapter.getItem(position);
planet.toggleChecked();
SelectViewHolder viewHolder = (SelectViewHolder) item
.getTag();
viewHolder.getCheckBox().setChecked(planet.isChecked());
}
});
// Create and populate planets.
itemss = (mItems[]) getLastNonConfigurationInstance();
ArrayList<mItems> planetList = new ArrayList<mItems>();
planetList.add(new mItems("DJ-Android"));
planetList.add(new mItems("Android"));
planetList.add(new mItems("iPhone"));
planetList.add(new mItems("BlackBerry"));
planetList.add(new mItems("Java"));
planetList.add(new mItems("PHP"));
planetList.add(new mItems(".Net"));
// Set our custom array adapter as the ListView's adapter.
listAdapter = new SelectArralAdapter(this, planetList);
mainListView.setAdapter(listAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.add(0, 1, Menu.NONE, "Products");
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case 1:
for (int i = 0; i < checked.size(); i++) {
Log.d("pos : ", "" + checked.get(i));
}
break;
}
return super.onOptionsItemSelected(item);
}
/** Holds planet data. */
private static class mItems {
private String name = "";
private boolean checked = false;
public mItems() {
}
public mItems(String name) {
this.name = name;
}
public mItems(String name, boolean checked) {
this.name = name;
this.checked = checked;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isChecked() {
return checked;
}
public void setChecked(boolean checked) {
this.checked = checked;
}
public String toString() {
return name;
}
public void toggleChecked() {
checked = !checked;
}
}
/** Holds child views for one row. */
private static class SelectViewHolder {
private CheckBox checkBox;
private TextView textView;
public SelectViewHolder() {
}
public SelectViewHolder(TextView textView, CheckBox checkBox) {
this.checkBox = checkBox;
this.textView = textView;
}
public CheckBox getCheckBox() {
return checkBox;
}
public void setCheckBox(CheckBox checkBox) {
this.checkBox = checkBox;
}
public TextView getTextView() {
return textView;
}
public void setTextView(TextView textView) {
this.textView = textView;
}
}
/** Custom adapter for displaying an array of Planet objects. */
private static class SelectArralAdapter extends ArrayAdapter<mItems> {
private LayoutInflater inflater;
public SelectArralAdapter(Context context, List<mItems> planetList) {
super(context, R.layout.simplerow, R.id.rowTextView, planetList);
// Cache the LayoutInflate to avoid asking for a new one each time.
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Planet to display
mItems planet = (mItems) this.getItem(position);
// The child views in each row.
CheckBox checkBox;
TextView textView;
// Create a new row view
if (convertView == null) {
convertView = inflater.inflate(R.layout.simplerow, null);
// Find the child views.
textView = (TextView) convertView
.findViewById(R.id.rowTextView);
checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);
// Optimization: Tag the row with it's child views, so we don't
// have to
// call findViewById() later when we reuse the row.
convertView.setTag(new SelectViewHolder(textView, checkBox));
// If CheckBox is toggled, update the planet it is tagged with.
checkBox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
mItems planet = (mItems) cb.getTag();
planet.setChecked(cb.isChecked());
}
});
}
// Reuse existing row view
else {
// Because we use a ViewHolder, we avoid having to call
// findViewById().
SelectViewHolder viewHolder = (SelectViewHolder) convertView
.getTag();
checkBox = viewHolder.getCheckBox();
textView = viewHolder.getTextView();
}
// Tag the CheckBox with the Planet it is displaying, so that we can
// access the planet in onClick() when the CheckBox is toggled.
checkBox.setTag(planet);
// Display planet data
checkBox.setChecked(planet.isChecked());
textView.setText(planet.getName());
return convertView;
}
}
public Object onRetainNonConfigurationInstance() {
return itemss;
}
}
package com.example.vreaucarnet;
导入java.util.ArrayList;
导入java.util.List;
导入android.app.Activity;
导入android.content.Context;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.AdapterView;
导入android.widget.ArrayAdapter;
导入android.widget.CheckBox;
导入android.widget.ListView;
导入android.widget.TextView;
公共类活动A扩展维护活动2A{
私有ListView主ListView;
私人物品;
专用阵列适配器列表适配器;
选中ArrayList=新建ArrayList();
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.acte2a);
//查找ListView资源。
mainListView=(ListView)findViewById(R.id.mainListView);
//点击项目时,切换复选框和的选中属性
//行星。
主列表视图
.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父项、视图项、,
内部位置,长id){
mItems planet=listAdapter.getItem(位置);
planet.toggleChecked();
SelectViewHolder viewHolder=(SelectViewHolder)项目
.getTag();
viewHolder.getCheckBox().setChecked(planet.isChecked());
}
});
//创建并填充行星。
itemss=(mItems[])getLastNonConfigurationInstance();
ArrayList planetList=新的ArrayList();
添加(新的mItems(“DJ Android”);
添加(新的mItems(“安卓”);
planetList.add(新的mItems(“iPhone”));
添加(新的mItems(“黑莓”);
添加(新的mItems(“Java”));
添加(新的mItems(“PHP”);
planetList.add(新的mItems(“.Net”);
//将自定义阵列适配器设置为ListView的适配器。
listAdapter=new SelectArralAdapter(这是planetList);
mainListView.setAdapter(listAdapter);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//TODO自动生成的方法存根
添加(0,1,menu.NONE,“产品”);
返回super.onCreateOptions菜单(菜单);
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//TODO自动生成的方法存根
开关(item.getItemId()){
案例1:
对于(int i=0;ipackage com.example.vreaucarnet;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.Toast;
import android.widget.TextView;
public class ActeA extends MainActivity2A {
String PREFS_NAME = "CheckBox1Tag";
CheckBox m_checkBox2, m_checkBox1, m_checkBox3, m_checkBox4, m_checkBox5, m_checkBox6, m_checkBox7, m_checkBox8, m_checkBox9, m_checkBox10;
TextView textView1;
String KEY1 = "CheckBox1_key";
String KEY2 = "CheckBox2_key";
String KEY3 = "CheckBox3_key";
String KEY4 = "CheckBox4_key";
String KEY5 = "CheckBox5_key";
String KEY6 = "CheckBox6_key";
String KEY7 = "CheckBox7_key";
String KEY8 = "CheckBox8_key";
String KEY9 = "CheckBox9_key";
String KEY10 = "CheckBox10_key";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.acte2a);
CheckBox checkBox2, checkBox1, checkBox3, checkBox4, checkBox5, checkBox6, checkBox7, checkBox8, checkBox9, checkBox10;
TextView textView1;
m_checkBox2=(CheckBox) findViewById(R.id.checkBox2);
// checkBox2.setChecked(getFromSP("checkBox2"));
m_checkBox1=(CheckBox) findViewById(R.id.checkBox1);
//checkBox1.setChecked(getFromSP("checkBox1"));
m_checkBox3=(CheckBox) findViewById(R.id.checkBox3);
// checkBox3.setChecked(getFromSP("checkBox3"));
m_checkBox4=(CheckBox) findViewById(R.id.checkBox4);
// checkBox4.setChecked(getFromSP("checkBox4"));
m_checkBox5=(CheckBox) findViewById(R.id.checkBox5);
// checkBox5.setChecked(getFromSP("checkBox5"));
m_checkBox6=(CheckBox) findViewById(R.id.checkBox6);
// checkBox6.setChecked(getFromSP("checkBox6"));
m_checkBox7=(CheckBox) findViewById(R.id.checkBox7);
// checkBox7.setChecked(getFromSP("checkBox7"));
m_checkBox8=(CheckBox) findViewById(R.id.checkBox8);
// checkBox8.setChecked(getFromSP("checkBox8"));
m_checkBox9=(CheckBox) findViewById(R.id.checkBox9);
// checkBox9.setChecked(getFromSP("checkBox9"));
m_checkBox10=(CheckBox) findViewById(R.id.checkBox10);
// checkBox10.setChecked(getFromSP("checkBox10"));
textView1=(TextView) findViewById(R.id.textView1);
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
boolean
isChecked = settings.getBoolean(KEY1, false);
m_checkBox1.setChecked(isChecked);
isChecked = settings.getBoolean(KEY2, false);
m_checkBox2.setChecked(isChecked);
isChecked = settings.getBoolean(KEY3, false);
m_checkBox3.setChecked(isChecked);
isChecked = settings.getBoolean(KEY4, false);
m_checkBox4.setChecked(isChecked);
isChecked = settings.getBoolean(KEY5, false);
m_checkBox5.setChecked(isChecked);
isChecked=settings.getBoolean(KEY6, false);
m_checkBox6.setChecked(isChecked);
isChecked = settings.getBoolean(KEY7, false);
m_checkBox7.setChecked(isChecked);
isChecked = settings.getBoolean(KEY8, false);
m_checkBox8.setChecked(isChecked);
isChecked = settings.getBoolean(KEY9, false);
m_checkBox9.setChecked(isChecked);
isChecked = settings.getBoolean(KEY10, false);
m_checkBox10.setChecked(isChecked);
}
@Override
protected void onStop() {
super.onStop();
// We need an Editor object to make preference changes.
// All objects are from android.context.Context
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean(KEY1, m_checkBox1.isChecked());
editor.putBoolean(KEY2, m_checkBox2.isChecked());
editor.putBoolean(KEY3, m_checkBox3.isChecked());
editor.putBoolean(KEY4, m_checkBox4.isChecked());
editor.putBoolean(KEY5, m_checkBox5.isChecked());
editor.putBoolean(KEY6, m_checkBox6.isChecked());
editor.putBoolean(KEY7, m_checkBox7.isChecked());
editor.putBoolean(KEY8, m_checkBox8.isChecked());
editor.putBoolean(KEY9, m_checkBox9.isChecked());
editor.putBoolean(KEY10, m_checkBox10.isChecked());
// Commit the edits!
editor.commit();
}
}