本文介绍了使用共享preferences将数据发送到另一个活动的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
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＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; 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＆LT; 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＆LT;太虚，太虚，太虚＆GT; { @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＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;（）; 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＆LT; jsonarray.length（）;我++）{
HashMap的＆LT;字符串，字符串＆GT;地图=新的HashMap＆LT;字符串，字符串＆GT;（）;
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＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;数据;
HashMap的＆LT;字符串，字符串＆GT; resultp =新的HashMap＆LT;字符串，字符串＆GT;（）;
SparseBooleanArray mysparse; 公共ListViewAdapterForAtomicListItemtype（上下文的背景下，
ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;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＆LT;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＆LT;串GT;（）; LV =（ListView控件）findViewById（R.id.listViewData）; myList.add（MYNAME）; ArrayAdapter＆LT;串GT;适配器=新ArrayAdapter＆LT;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＆LT; HashMap的＆LT;字符串，字符串＆GT;＆GT; 在多个活动则更好保存为应用水平这一点，你可以使用。
下面是样本code你的学习。
MyApplication.java
公共类MyApplication的扩展应用{ ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; ArrayList的; @覆盖
公共无效的onCreate（）{ super.onCreate（）;
} 公共无效setArrayListMapData（ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;使用setData）
{
ArrayList的使用setData =;
} 公众的ArrayList＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; getArrayListMapData（）
{
返回数组列表;
}
}
MyActivity.java
公共类MyActivity延伸活动{ ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT; 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
＆lt;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
＆GT; ..................
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.
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