Android 活动后微调器更新

在我的应用程序中，当用户单击微调器中的某个项目时，它将转到新活动，因为我有5个编辑文本，我保留微调器的值，当用户编辑此值并按“保存”按钮时，编辑的值应替换微调器中的旧值。如何实现此目的？请帮助我

我的微调器代码：

 public class BudgetJulyo4Activity extends Activity
{
        /** Called when the activity is first created. */
        DBadapter db =new DBadapter(this); 
        DBadapterRec dbrec=new DBadapterRec(this);
        public void onCreate(Bundle savedInstanceState) 
        {       

            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);  
            Button b1=(Button)findViewById(R.id.button1);
            Button b2=(Button)findViewById(R.id.button2);
            Button b3=(Button)findViewById(R.id.button3);
            Button b4=(Button)findViewById(R.id.button4); 
            Spinner s1=(Spinner)findViewById(R.id.spinner);
            Spinner s2=(Spinner)findViewById(R.id.spinner1);

            ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                    this, R.array.recurr_array, android.R.layout.simple_spinner_item);
            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            s1.setAdapter(adapter);        

            String group[]=getResources().getStringArray(R.array.group_array);------>Before calling edit(i.e when enters first time i am showing some hardcore value)

            ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(
                    this, android.R.layout.simple_spinner_item,group);
            adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            s2.setAdapter(adapter1);    
}

 protected void onActivityResult(int requestCode, int resultCode, Intent data) ------>After edit option.
        {      
            java.lang.System.out.println("Inside act");
            // TODO Auto-generated method stub        
//      }
            super.onActivityResult(requestCode, resultCode, data);        
            if(resultCode==1)
            {          
                 Spinner s2=(Spinner)findViewById(R.id.spinner1);
                String str1=data.getStringExtra("grp1val");    
                String str2=data.getStringExtra("grp2val");  
                String str3=data.getStringExtra("grp3val");
                String str4=data.getStringExtra("grp4val"); 
                String str5=data.getStringExtra("grp5val");  
                String str6="Edit";

                String group[] = new String[] { str1,str2,str3,str4,str5,str6};
                 ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(
                        this, android.R.layout.simple_spinner_item,group);               
                adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                s2.setAdapter(adapter1);                

            }
        }
}

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如果微调器的适配器扩展了BaseAdapter，则应在修改数据后对其调用notifyDataSetChanged：

((BaseAdapter)s2.getAdapter()).notifyDataSetChanged();

---

在setOnItemSelectedListener中使用s2.setselectionposition并将该值保存在共享首选项中，在创建该活动时使用上述方法

尝试将“开始微调器”编辑活动作为startactivityforresult而不是startActivity，以便在微调器活动中获取用户保存的值，然后可以使用中的最新值更新微调器startactivityforresult：

---

谢谢Pravena_Pinki。。但我在android中没有达到这个级别。你能为你发布的上述答案提供一些详细信息吗？@prakash的可能副本：以startactivityforresult而不是startActivity启动SpinnerEdit，并在SpinnerEdit活动中使用setResult将数据发送回Spinner活动。然后在startactivityforresult中，你可以重置Spinner用户在SpinnerEdit活动中选择的值。@prakash.k为什么发布相同的问题？我尝试了这个，然后得到了这个异常07-16 12:59:13.167:E/AndroidRuntime543:java.lang.UnsupportedOperationException您能在异常的跟踪中看到它在代码中发生的位置吗？finalArrayAdapter NoCoreAdapter=新的ArrayAdapter此，android.R.layout.simple\u微调器\u项，月份；NoCoreAdapter.setDropDownViewResourceandroid.R.layout.simple\u微调器\u下拉菜单\u项；mon_spinner.SetOnItemSelectedListener新建AdapterView.OnItemSelectedListener{public void onItemSelectedAdapterView父级，视图视图，int pos，长id{int index=0；NoCoreAdapter.addEDIT；BaseAdapter mon_spinner.getAdapter.notifyDataSetChanged；我将在下面发送日志：07-16 13:14:07.198:ERROR/AndroidRuntime604:java.lang.UnsupportedOperationException 07-16 13:14:07.198:ERROR/AndroidRuntime604:at java.util.AbstractList.addAbstractList.java:41107-16 13:14:07.198:ERROR/AndroidRuntime604:at java.util.AbstractList.addAbstractList.java:432 07-16 13:14:07.198:ERROR/AndroidRuntime604:at android.widget.ArrayaAdapter.AddArrayaAdapter.java:178 07-16 13:14:07.198:ERROR/AndroidRuntime604:at com.experts.IVScreen.ListMonthActivity$1.onItemSelectedListMonthActivity.java:87HI我想要传递到spinneredit类中“后退”按钮中的另一个活动。这是我的以下代码：Intent spin=new IntentgetApplicationContext，BudgetJulyo4Activity.class；spin.putextgrp1val，group1.getText.toString；spin.putextgrp2val，group2.getText.toString；spin.putextgrp3val，group3.getText.toString；spin.putExtragrp4val，group4.getText.toString；spin.putExtragrp5val，group5.getText.toString；startActivityForResultspin，1；。但它不会进入activityonresult代码。请在SpinnerEdit中使用setResult而不是startActivityForResultActivity@prakash.k：当前正在使用哪个适配器在微调器中填充数据？这是微调器在编辑选项之前填充代码：ArrayAdapter Adapter 1=ArrayAdapter.createFromResource this，R.array.group_array，android.R.layout.simple_微调器项目；Adapter 1.setDropDownViewResourceandroid.R.layout.simple_微调器项目；s2.SetAdapter Adapter Adapter Adapter 1；尝试Adapter 1.addnew value；在startAct中ivityForResult，您可以找到许多示例，说明我们如何通过Stackoverflow上的代码更新ArrayAdapter。

public void onItemSelected(AdapterView<?> s2, View arg1,
    int pos, long id) {
    // TODO Auto-generated method stub  
    group=s2.getItemAtPosition(pos).toString();
    if(group.equals("Edit"))
      {
        Intent i = new Intent(getApplicationContext(),SpinnerEdit.class);
        startActivityForResult(i, 1);
      }
      //your code here...

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode==1){
           String str1=ata.getStringExtra("grp1val");
           ...
           //here you can update your Spinner Adapter with latest values
        }
        else{
            Toast.makeText(this, "Fail", Toast.LENGTH_LONG).show();
        }

saveButton.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
    Intent spin = new Intent();
    spin.putExtra("grp1val", group1.getText().toString()); 
    spin.putExtra("grp2val", group2.getText().toString()); 
    spin.putExtra("grp3val", group3.getText().toString()); 
    spin.putExtra("grp4val", group4.getText().toString()); 
    spin.putExtra("grp5val", group5.getText().toString());
    setResult(1,spin);
    finish();
  }
});