在我的应用程序中，我有三个编辑文本，并且我使用共享首选项来存储这些数字。我想从共享偏好中获取数字并显示在编辑文本中，我也想编辑文本。当我运行下面的代码时，我得到了 NullPointerException。有人可以帮助我吗？
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.change_cell_number);
init();
/*SharedPreferences sharedPref=this.getSharedPreferences("MY_PREF_2",MODE_WORLD_READABLE);
SharedPreferences.Editor shredPref_Editor=sharedPref.edit();
shredPref_Editor.putString(MY_ACTIVITY,"changeSMSnumber");
shredPref_Editor.commit();
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(ChangeSmsNumber_Activity.this);
String servername = settings.getString("sharedPreferencesKey", "defaultValue");
//server.setText(servername);
*/
btnSubmit.setOnClickListener(new OnClickListener()
{
@SuppressWarnings("unused")
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
String numberISD=edtxt_ISD_Code1.getText().toString();
if(edtxt_ISD_Code1.getText().toString().isEmpty())
{
Toast.makeText(getApplicationContext(),"Enter ISD 1st Number * ", Toast.LENGTH_SHORT).show();
}
else if(edtxt_Cell_Number1.getText().toString().isEmpty())
{
Toast.makeText(getApplicationContext(),"Enter 1st Number *", Toast.LENGTH_SHORT).show();
}
else
{
String strSign1 = edtxt_PlusSign1.getText().toString();
String strSign2 = edtxt_PlusSign2.getText().toString();
String strSign3 = edtxt_PlusSign3.getText().toString();
String strSign4 = edtxt_PlusSign4.getText().toString();
String strSign5 = edtxt_PlusSign5.getText().toString();
String strIsd1 = edtxt_ISD_Code1.getText().toString();
String strIsd2 = edtxt_ISD_Code2.getText().toString();
String strIsd3 = edtxt_ISD_Code3.getText().toString();
String strIsd4 = edtxt_ISD_Code4.getText().toString();
String strIsd5 = edtxt_ISD_Code5.getText().toString();
String strNum1 = edtxt_Cell_Number1.getText().toString();
String strNum2 = edtxt_Cell_Number2.getText().toString();
String strNum3 = edtxt_Cell_Number3.getText().toString();
String strNum4 = edtxt_Cell_Number4.getText().toString();
String strNum5 = edtxt_Cell_Number5.getText().toString();
String final_Num_1 = strSign1 + strIsd1 + strNum1;
String final_Num_2 = strSign2 + strIsd2 + strNum2;
String final_Num_3 = strSign3 + strIsd3 + strNum3;
String final_Num_4 = strSign4 + strIsd4 + strNum4;
String final_Num_5 = strSign5 + strIsd5 + strNum5;
SharedPreferences settings = ChangeSmsNumber_Activity.this.getSharedPreferences("MyPref_CellNumber",0);
strGetCellNum = settings.getString("num1", "n/a");
final_Num_1=strGetCellNum;
}
}
});
}
请指导我。