我做了什么:
正如你可以清楚地看到我从 BLD_IndividualListOfItems_Starters
使用意图将数据发送到 ResultActivity
...看起来像它集合
我想实现 ::我想用达到相同的输出共享preferences
....在 BLD_IndividualListOfItems_Starters
意味着我要添加数据&安培;在 ResultActivity
我想用共享preferences检索它
在code什么样的变化,我应该需要做
BLD_IndividualListOfItems_Starters.java
公共类BLD_IndividualListOfItems_Starters延伸活动{ //声明变量 的JSONObject的JSONObject; JSONArray jsonarray; ListView控件列表视图; ListViewAdapterForAtomicListItemtype适配器; ProgressDialog mProgressDialog; ArrayList的<&HashMap的LT;字符串,字符串>> ArrayList的; 静态字符串NAME =等级; 按钮BTN; 串TYPE_FILTER; StringBuilder的结果; @覆盖 公共无效的onCreate(捆绑savedInstanceState){ super.onCreate(savedInstanceState); //从listview_main.xml视图 的setContentView(R.layout.listview_main); TYPE_FILTER = getIntent()getExtras()的getString(key_title)。。 Log.v(----价值开始---,TYPE_FILTER); //定位listview_main.xml列表视图 列表视图=(ListView控件)findViewById(R.id.listview); BTN =(按钮)findViewById(R.id.button1); btn.setOnClickListener(新OnClickListener(){ @覆盖 公共无效的onClick(视图v){ // TODO自动生成方法存根 结果=新的StringBuilder(); 的for(int i = 0; I< arraylist.size();我++){ 如果(adapter.mysparse.get(我)==真){ result.append(arraylist.get(I)获得(BLD_IndividualListOfItems_Starters.NAME)); result.append(\\ n); } } 意图N =新意图(BLD_IndividualListOfItems_Starters.this,ResultActivity.class); n.putExtra(缓冲,result.toString()); startActivity(N); } }); //执行DownloadJSON的AsyncTask 新DownloadJSON()执行(); } // DownloadJSON的AsyncTask 私有类DownloadJSON扩展的AsyncTask<太虚,太虚,太虚> { @覆盖 在preExecute保护无效(){ super.on preExecute(); //创建一个progressdialog mProgressDialog =新ProgressDialog(BLD_IndividualListOfItems_Starters.this); //设置progressdialog称号 //mProgressDialog.setTitle(\"Fetching信息); //设置progressdialog消息 mProgressDialog.setMessage(正在加载...); mProgressDialog.setIndeterminate(假); //显示progressdialog mProgressDialog.show(); } @覆盖 保护无效doInBackground(虚空...... PARAMS){ //创建一个数组 ArrayList的=新的ArrayList<&HashMap的LT;字符串,字符串>>(); 字符串NEWURL =? +键=+ TYPE_FILTER; //从给定的URL地址JSON对象 的JSONObject = JSONfunctions.getJSONfromURL(http://54.218.73.244:7005/RestaurantAtomicListItemType/+ NEWURL); 尝试{ //找到在JSON数组名 jsonarray = jsonobject.getJSONArray(餐馆); 的for(int i = 0; I< jsonarray.length();我++){ HashMap的<字符串,字符串>地图=新的HashMap<字符串,字符串>(); 的JSONObject = jsonarray.getJSONObject(ⅰ); // Retrive JSON对象 map.put(BLD_IndividualListOfItems_Starters.NAME,jsonobject.getString(MasterListMenuName)); //设置JSON对象到数组 arraylist.add(地图); } }赶上(JSONException E){ Log.e(错误,e.getMessage()); e.printStackTrace(); } 返回null; } @覆盖 保护无效onPostExecute(无效参数){ //将结果传递到ListViewAdapter.java 适配器=新ListViewAdapterForAtomicListItemtype(BLD_IndividualListOfItems_Starters.this,ArrayList的); //适配器设置到ListView listview.setAdapter(适配器); //关闭progressdialog mProgressDialog.dismiss(); } } }
ListViewAdapterForAtomicListItemtype.java
公共类ListViewAdapterForAtomicListItemtype扩展BaseAdapter实现OnCheckedChangeListener { //声明变量 上下文语境; LayoutInflater吹气; ArrayList的<&HashMap的LT;字符串,字符串>>数据; HashMap的<字符串,字符串> resultp =新的HashMap<字符串,字符串>(); SparseBooleanArray mysparse; 公共ListViewAdapterForAtomicListItemtype(上下文的背景下, ArrayList的<&HashMap的LT;字符串,字符串>>数组列表){ this.context =背景; 数据=数组列表; mysparse =新SparseBooleanArray(data.size()); } @覆盖 公众诠释的getCount(){ 返回data.size(); } @覆盖 公共对象的getItem(INT位置){ 返回null; } @覆盖 众长getItemId(INT位置){ 返回0; } 公共查看getView(最终诠释的立场,观点convertView,父母的ViewGroup){ //声明变量 TextView的名称; 复选框CHK; 吹气=(LayoutInflater)上下文 .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 查看ItemView控件= inflater.inflate(R.layout.listview_item_for_atomic_list_item_type,父母,假); //获取位置 resultp = data.get(位置); //定位listview_item.xml的TextViews 名字=(TextView中)itemView.findViewById(R.id.textView_id_atomic_list_item_type); CHK =(复选框)itemView.findViewById(R.id.checkBox_atomic_list_item_type_id); //捕捉位置,并设置结果向TextViews name.setText(resultp.get(BLD_IndividualListOfItems_Starters.NAME)); chk.setTag(位置); chk.setChecked(mysparse.get(位置,FALSE)); chk.setOnCheckedChangeListener(本); 返回ItemView控件; } 公共布尔器isChecked(INT位置){ 返回mysparse.get(位置,FALSE); } 公共无效setChecked(INT位置,布尔器isChecked){ mysparse.put(位置,器isChecked); } 公共无效切换(INT位置){ setChecked(位置,器isChecked(位置)!); } @覆盖 公共无效onCheckedChanged(CompoundButton buttonView,布尔器isChecked){ // TODO自动生成方法存根 mysparse.put((整数)buttonView.getTag(),器isChecked); }}
ResultActivity.java
公共类ResultActivity延伸活动{ LV的ListView; ArrayList的<串GT; myList中; 串MYNAME; @覆盖 保护无效的onCreate(捆绑savedInstanceState){ // TODO自动生成方法存根 super.onCreate(savedInstanceState); 的setContentView(R.layout.second); 意向N = getIntent(); MYNAME = n.getStringExtra(缓冲区); myList中=新的ArrayList<串GT;(); LV =(ListView控件)findViewById(R.id.listViewData); myList.add(MYNAME); ArrayAdapter<串GT;适配器=新ArrayAdapter<串GT;(ResultActivity.this,R.layout.custom_single_list,R.id.textView1,myList中); lv.setAdapter(适配器); }}
解决方案
如果你想使用的ArrayList< HashMap的<字符串,字符串>>
在多个活动则更好保存为应用水平这一点,你可以使用应用类。
下面是样本code你的学习。
MyApplication.java
公共类MyApplication的扩展应用{ ArrayList的<&HashMap的LT;字符串,字符串>> ArrayList的; @覆盖 公共无效的onCreate(){ super.onCreate(); } 公共无效setArrayListMapData(ArrayList的<&HashMap的LT;字符串,字符串>>使用setData) { ArrayList的使用setData =; } 公众的ArrayList<&HashMap的LT;字符串,字符串>> getArrayListMapData() { 返回数组列表; }}
MyActivity.java
公共类MyActivity延伸活动{ ArrayList的<&HashMap的LT;字符串,字符串>> ArrayList的; 所有MyApplication mApplication; @覆盖 公共无效的onCreate(捆绑savedInstanceState){ mApplication =(所有MyApplication)getApplication(); //如何分配列表数据 mApplication.setArrayListMapData(数组列表); //如何获得相同的列表数据 ArrayList的= mApplication.getArrayListMapData(); super.onCreate(savedInstanceState); }}
您可以在同一code多活动得到相同的列表。
注意:不要忘了在 menifest.xml
<应用 机器人:名字=com.android.app.MyApplication 机器人:图标=@绘制/ ic_launcher 机器人:标签=@字符串/ APP_NAME > ..................
下面的 com.android.app 是包名和所有MyApplication 是类名。
What Have i done ::
As you can clearly see i am sending data from BLD_IndividualListOfItems_Starters
to ResultActivity
using intents... looks like its a collection
What i want to achieve ::
I want to achieve same output using shared preferences
....that means in BLD_IndividualListOfItems_Starters
i want to add the data & in ResultActivity
i want to retrieve it using shared preferences
What changes in code should i need to make
BLD_IndividualListOfItems_Starters.java
public class BLD_IndividualListOfItems_Starters extends Activity{
// Declare Variables
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapterForAtomicListItemtype adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
static String NAME = "rank";
Button btn;
String TYPE_FILTER;
StringBuilder result;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from listview_main.xml
setContentView(R.layout.listview_main);
TYPE_FILTER = getIntent().getExtras().getString("key_title");
Log.v("---- Value-Start---", TYPE_FILTER);
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
result = new StringBuilder();
for (int i = 0; i < arraylist.size(); i++) {
if (adapter.mysparse.get(i) == true) {
result.append(arraylist.get(i).get(BLD_IndividualListOfItems_Starters.NAME));
result.append("\n");
}
}
Intent n = new Intent(BLD_IndividualListOfItems_Starters.this, ResultActivity.class);
n.putExtra("buffer", result.toString());
startActivity(n);
}
});
// Execute DownloadJSON AsyncTask
new DownloadJSON().execute();
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(BLD_IndividualListOfItems_Starters.this);
// Set progressdialog title
//mProgressDialog.setTitle("Fetching the information");
// Set progressdialog message
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(false);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
String newurl = "?" + "Key=" + TYPE_FILTER;
// Retrieve JSON Objects from the given URL address
jsonobject = JSONfunctions.getJSONfromURL("http://54.218.73.244:7005/RestaurantAtomicListItemType/"+newurl);
try {
// Locate the array name in JSON
jsonarray = jsonobject.getJSONArray("restaurants");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
map.put(BLD_IndividualListOfItems_Starters.NAME, jsonobject.getString("MasterListMenuName"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args) {
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapterForAtomicListItemtype(BLD_IndividualListOfItems_Starters.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}
}
ListViewAdapterForAtomicListItemtype.java
public class ListViewAdapterForAtomicListItemtype extends BaseAdapter implements OnCheckedChangeListener {
// Declare Variables
Context context;
LayoutInflater inflater;
ArrayList<HashMap<String, String>> data;
HashMap<String, String> resultp = new HashMap<String, String>();
SparseBooleanArray mysparse;
public ListViewAdapterForAtomicListItemtype(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
mysparse = new SparseBooleanArray(data.size());
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Declare Variables
TextView name;
CheckBox chk;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.listview_item_for_atomic_list_item_type, parent, false);
// Get the position
resultp = data.get(position);
// Locate the TextViews in listview_item.xml
name = (TextView) itemView.findViewById(R.id.textView_id_atomic_list_item_type);
chk = (CheckBox) itemView.findViewById(R.id.checkBox_atomic_list_item_type_id);
// Capture position and set results to the TextViews
name.setText(resultp.get(BLD_IndividualListOfItems_Starters.NAME));
chk.setTag(position);
chk.setChecked(mysparse.get(position, false));
chk.setOnCheckedChangeListener(this);
return itemView;
}
public boolean isChecked(int position) {
return mysparse.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mysparse.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
mysparse.put((Integer) buttonView.getTag(), isChecked);
}
}
ResultActivity.java
public class ResultActivity extends Activity {
ListView lv;
ArrayList<String> myList;
String myName;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
Intent n = getIntent();
myName = n.getStringExtra("buffer");
myList = new ArrayList<String>();
lv = (ListView) findViewById(R.id.listViewData);
myList.add(myName);
ArrayAdapter<String> adapter=new ArrayAdapter<String>(ResultActivity.this,R.layout.custom_single_list,R.id.textView1, myList);
lv.setAdapter(adapter);
}
}
解决方案
If you want to use ArrayList<HashMap<String, String>>
in multiple activity then better to save as application level for this you can use Application class.
below is sample code for your study..
MyApplication.java
public class MyApplication extends Application {
ArrayList<HashMap<String, String>> arraylist;
@Override
public void onCreate() {
super.onCreate();
}
public void setArrayListMapData(ArrayList<HashMap<String, String>> setData)
{
arraylist = setData;
}
public ArrayList<HashMap<String, String>> getArrayListMapData()
{
return arraylist;
}
}
MyActivity.java
public class MyActivity extends Activity {
ArrayList<HashMap<String, String>> arraylist;
MyApplication mApplication;
@Override
public void onCreate(Bundle savedInstanceState) {
mApplication = (MyApplication)getApplication();
//how to assign list data
mApplication.setArrayListMapData(arraylist);
//how to get same list data
arraylist = mApplication.getArrayListMapData();
super.onCreate(savedInstanceState);
}
}
You can get same list in multiple activity with same code..
Note: don't forgot to register class in menifest.xml
<application
android:name="com.android.app.MyApplication"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
> ..................
Here com.android.app is package name and MyApplication is class name.