我基本上想在这里做的是，我使用php文件从数据库接收数据，我想将它们存储在shearedpreference中，以便以后在另一个活动中使用，
这是我的json
{"NEW_DISPLAY_SCHEDULE":[{"ScheduleDate":"2018-03-01","StartTime":"9:10 am","Endtime":"11:30 am"},{"ScheduleDate":"2018-03-02","StartTime":"2:00 pm","Endtime":"4:00 pm"},{"ScheduleDate":"2018-03-03","StartTime":"5:00 pm","Endtime":"6:00 pm"},{"ScheduleDate":"2018-03-04","StartTime":"2:00 pm","Endtime":"6:00 pm"},{"ScheduleDate":"2018-03-05","StartTime":"RTO","Endtime":""},{"ScheduleDate":"2018-03-06","StartTime":"10:00 am","Endtime":"11:00 pm"},{"ScheduleDate":"2018-03-06","StartTime":"2:00 pm","Endtime":"4:00 pm"},{"ScheduleDate":"2018-03-31","StartTime":"6:00 am","Endtime":"4:00 pm"},{"ScheduleDate":"2018-03-14","StartTime":"7:00 am","Endtime":"4:00 pm"},{"ScheduleDate":"2018-03-28","StartTime":"1:00 pm","Endtime":"4:00 pm"}]}
这是我的android活动，我将它们存储在shearedpreference中，
第一项活动
SharedPreferences sp = getSharedPreferences("identifier", Context.MODE_PRIVATE);
SharedPreferences.Editor Ed= sp.edit();
Ed.putString("result", result );
Ed.commit();
在第二次活动中，我试着像这样收到
package com.example.myapplication;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class Main2Activity extends AppCompatActivity {
Context context;
String jsonarray;
JSONArray jsonArray;
private ArrayList<String> ScheduleDateArray=new ArrayList<>();
int L;
String[] ScheduleDates,StartTimes,Endtimes;
String ScheduleDate;
TextView Dates;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
context = getApplicationContext();
SharedPreferences mPrefs = getSharedPreferences("identifier", Context.MODE_PRIVATE);
jsonarray = mPrefs.getString("result", null);
try {
JSONObject jsonObjects = new JSONObject(jsonarray);
try {
jsonArray=jsonObjects.getJSONArray("NEW_DISPLAY_SCHEDULE");
for (int i=0;i<jsonArray.length();i++){
JSONObject jsonObject=jsonArray.getJSONObject(i);
ScheduleDate=jsonObject.getString("ScheduleDate");
ScheduleDateArray.add(ScheduleDate);
// String StartTime=jsonObject.getString("StartTime");
//String Endtime=jsonObject.getString("Endtime");
// Toast.makeText(Main2Activity.this , ScheduleDate+"/"+StartTime+"/"+Endtime, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
for(int i=0;i<=jsonArray.length();i++){
Toast.makeText(Main2Activity.this , "ScheduleDates"+ ScheduleDateArray.get(i), Toast.LENGTH_LONG).show();
}
// Dates=(TextView)findViewById(R.id.textView);
// Dates.setText(jsonarray);
}
}
我的问题是我不知道如何从shearedpreference分离第二个活动中的字符串，应用程序正在关闭，任何人都帮我分开字符串，我想把它们放在吐司。
logcat的
03-13 13:51:50.160 4045-4045/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 4045
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.Main2Activity}: java.lang.IndexOutOfBoundsException: Invalid index 10, size is 10
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IndexOutOfBoundsException: Invalid index 10, size is 10
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.example.myapplication.Main2Activity.onCreate(Main2Activity.java:63)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
答案 0 :(得分：0)
首先使用jsonobject字符串
result
try {
JSONObject MyObject=new JSONObject("{\"NEW_DISPLAY_SCHEDULE\":[{\"ScheduleDate\":\"2018-03-01\",\"StartTime\":\"9:10 am\",\"Endtime\":\"11:30 am\"},{\"ScheduleDate\":\"2018-03-02\",\"StartTime\":\"2:00 pm\",\"Endtime\":\"4:00 pm\"},{\"ScheduleDate\":\"2018-03-03\",\"StartTime\":\"5:00 pm\",\"Endtime\":\"6:00 pm\"},{\"ScheduleDate\":\"2018-03-04\",\"StartTime\":\"2:00 pm\",\"Endtime\":\"6:00 pm\"},{\"ScheduleDate\":\"2018-03-05\",\"StartTime\":\"RTO\",\"Endtime\":\"\"},{\"ScheduleDate\":\"2018-03-06\",\"StartTime\":\"10:00 am\",\"Endtime\":\"11:00 pm\"},{\"ScheduleDate\":\"2018-03-06\",\"StartTime\":\"2:00 pm\",\"Endtime\":\"4:00 pm\"},{\"ScheduleDate\":\"2018-03-31\",\"StartTime\":\"6:00 am\",\"Endtime\":\"4:00 pm\"},{\"ScheduleDate\":\"2018-03-14\",\"StartTime\":\"7:00 am\",\"Endtime\":\"4:00 pm\"},{\"ScheduleDate\":\"2018-03-28\",\"StartTime\":\"1:00 pm\",\"Endtime\":\"4:00 pm\"}]}");
} catch (JSONException e) {
e.printStackTrace();
}
然后这样做
SharedPreferences preferences = getSharedPreferences("identifier", Context.MODE_PRIVATE);
在您的第一个活动中执行此操作以保存
Editor prefsEditor = preferences.edit();
Gson gson = new Gson();
String json = gson.toJson(MyObject);
prefsEditor.putString("MyResultObject", json);
prefsEditor.commit();
并在第二个活动中检索它
Gson gson = new Gson();
String json = preferences.getString("MyResultObject", "");
JSONObject obj = gson.fromJson(json, JSONObject.class);
现在从这个json对象获取任何键，
try {
JSONArray jsonArray=obj.getJSONArray("NEW_DISPLAY_SCHEDULE");
for (int i=0;i<jsonArray.length();i++){
JSONObject jsonObject=jsonArray.getJSONObject(i);
String ScheduleDate=jsonObject.getString("ScheduleDate");
ScheduleDateArray.add(ScheduleDate);
//add toast here to display the value of ScheduleDate in first array element
Toast.makeText(Main2Activity.this , "ScheduleDates"+ ScheduleDate, Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
注意：首先初始化此＆gt;＆gt; private ArrayList<String> ScheduleDateArray=new ArrayList<>();