java - 在android中的EditText中保存信息

Question

我正在尝试使用 onsaveinstancestate 保留 Edittext View 中的数据。用户单击“添加”按钮，该按钮应该保留 Edittext View 中的信息。单击添加按钮后，用户将返回到主 Activity 。当选择模块进行编辑时，会显示 edit_module 布局，但在 edittext View 中没有信息，我试图保留这些信息。有任何想法吗？？我想我可能错过了一个步骤，除了在 onsaveinstancestate 方法中保存字符串，然后在调用 Activity 时将这些字符串分配给 Edittext View 之外，还有更多吗？ Android 新手。

NewModule.java

public class NewModule extends Activity{

// The EditText objects

EditText ModuleCode;
EditText ModuleName;
EditText ModuleType;
EditText DayOfWeek;
EditText StartTime;
EditText EndTime;
EditText Location;
EditText AdditionalInfo;


@Override
public void onCreate(Bundle savedInstanceState) {


      // Get saved data if there is any

    super.onCreate(savedInstanceState);
    dbTools = new DBTools(this);
    // Designate that add_module.xml is the interface used

    setContentView(R.layout.add_module);

    // Initialize the EditText objects
    ModuleCode= (EditText) findViewById(R.id.modcodeet);
    ModuleName = (EditText) findViewById(R.id.modnameet);
    ModuleType = (EditText) findViewById(R.id.moduletypeet);
    DayOfWeek = (EditText) findViewById(R.id.dowet);
    StartTime = (EditText) findViewById(R.id.starttimeet);
    EndTime = (EditText) findViewById(R.id.endtimeet);
    Location = (EditText) findViewById(R.id.locationet);
    AdditionalInfo = (EditText) findViewById(R.id.additionalinfoet);



}
public void addNewModule(View view) {

    // Will hold the HashMap of values 

    HashMap<String, String> queryValuesMap =  new  HashMap<String, String>();




    // Get the values from the EditText boxes

    queryValuesMap.put("ModuleCode", ModuleCode.getText().toString());
    queryValuesMap.put("ModuleName", ModuleName.getText().toString());
    queryValuesMap.put("ModuleType", ModuleType.getText().toString());
    queryValuesMap.put("DayOfWeek", DayOfWeek.getText().toString());
    queryValuesMap.put("StartTime", StartTime.getText().toString());
    queryValuesMap.put("EndTime", EndTime.getText().toString());
    queryValuesMap.put("Location", Location.getText().toString());
    queryValuesMap.put("AdditionalInfo", AdditionalInfo.getText().toString());

    // Call for the HashMap to be added to the database

    dbTools.insertModule(queryValuesMap);

    // Call for MainActivity to execute

    this.callMainActivity(view);


}
public void callMainActivity(View view) {
    Intent theIntent = new Intent(getApplicationContext(), MainActivity.class);
    startActivity(theIntent);
}   

public void onSaveInstanceState(Bundle savedInstanceState){


EditText editText = (EditText) findViewById(R.id.modcodeet);
String code = editText.getText().toString();
savedInstanceState.putString("code", code);


EditText editText2 = (EditText) findViewById(R.id.modnameet);
String name = editText2.getText().toString();
savedInstanceState.putString("name", name);

EditText editText3 = (EditText) findViewById(R.id.moduletypeet);
String type = editText3.getText().toString();
savedInstanceState.putString("type", type);


EditText editText4 = (EditText) findViewById(R.id.dowet);
String dow = editText4.getText().toString();
savedInstanceState.putString("dow", dow);

EditText editText5 = (EditText) findViewById(R.id.starttimeet);
String messagesubject = editText5.getText().toString();
savedInstanceState.putString("start", messagesubject);

EditText editText6 = (EditText) findViewById(R.id.endtimeet);
String end = editText6.getText().toString();
savedInstanceState.putString("end",end);

EditText editText7 = (EditText) findViewById(R.id.locationet);
String location = editText7.getText().toString();
savedInstanceState.putString("location", location);

 EditText editText8 = (EditText) findViewById(R.id.additionalinfoet);
String additionalinfo = editText8.getText().toString();
savedInstanceState.putString("additionalinfo", additionalinfo);

super.onSaveInstanceState(savedInstanceState);

}

}

TIA

编辑Module.java

public class EditModule extends Activity{



EditText ModuleCode;
EditText ModuleName;
EditText ModuleType;
EditText DayOfWeek;
EditText StartTime;
EditText EndTime;
EditText Location;
EditText AdditionalInfo;

DBTools dbTools = new DBTools(this);

public void onCreate(Bundle savedInstanceState){

    super.onCreate(savedInstanceState);
    setContentView(R.layout.edit_module);


    if (savedInstanceState != null)
    {
          String strValue = savedInstanceState.getString("code"); 
          if (strValue != null);
           ModuleCode = (EditText)findViewById(R.id.modcodeet);
          ModuleCode.setText(strValue); 

        strValue = savedInstanceState.getString("name");
          if (strValue != null);
          ModuleName = (EditText)findViewById(R.id.modnameet);  
          ModuleName.setText(strValue);

          strValue = savedInstanceState.getString("type");
        if(strValue != null);
        ModuleType = (EditText)findViewById(R.id.moduletypeet);
            ModuleType.setText(strValue);

            strValue = savedInstanceState.getString("dow");
        if(strValue != null);
        DayOfWeek = (EditText)findViewById(R.id.dowet);
        DayOfWeek.setText(strValue);

        strValue = savedInstanceState.getString("start");
        if (strValue != null);
        StartTime = (EditText)findViewById(R.id.starttimeet);
        StartTime.setText(strValue);

        strValue = savedInstanceState.getString("end");
        if (strValue != null);
        EndTime = (EditText)findViewById(R.id.endtimeet);
        EndTime.setText(strValue);

        strValue = savedInstanceState.getString("location");
        if (strValue != null);
        Location = (EditText)findViewById(R.id.locationet);
        Location.setText(strValue);

        strValue = savedInstanceState.getString("additionalinfo");
        if (strValue != null);
        AdditionalInfo = (EditText)findViewById(R.id.additionalinfoet);
        AdditionalInfo.setText(strValue);

    }




public void editModule(View view){

    HashMap<String, String> queryValuesMap = new HashMap<String, String>();



    ModuleName = (EditText) findViewById(R.id.modnameet);
    ModuleType = (EditText) findViewById(R.id.moduletypeet);
    DayOfWeek = (EditText) findViewById(R.id.dowet);
    StartTime = (EditText) findViewById(R.id.starttimeet);
    EndTime = (EditText) findViewById(R.id.endtimeet);
    Location = (EditText) findViewById(R.id.locationet);
    AdditionalInfo = (EditText) findViewById(R.id.additionalinfoet);



    this.callMainActivity(view);

}


public void callMainActivity(View view){

    Intent objIntent = new Intent(getApplication(), MainActivity.class);

    startActivity(objIntent);

}



}

Answer 1

尝试这样:

//intialization of shared preferences
private SharedPreferences preferences;

//in oncreate() give like this:
preferences = PreferenceManager.getDefaultSharedPreferences(this);

// store the edittext value in shared preferences
Editor edit = preferences.edit();
edit.putString("edittextvalue", edittextvalue);
edit.commit();

//whereever u want to get value and use
String apptext = preferences.getString("edittextvalue","");