android - 如何保存在 xml 文件中的对话框窗口中动态创建的 editText 值？ - 安卓

Question

我创建了 2 个类和一个接口(interface)。一个处理对话框点击的接口(interface)，一个包含按钮和 TextView 的 MainActivity 类。 MainActiviy 类实例化我的第二个类 (FireMissilesFragment)，其中包含一个 AlertDialog 作为 fragment 。在 FireMisslesFragment 中，我动态创建了 EditText。我的应用程序的问题是，当我在实例化 FireMissilesFragment 的 mainActivity 类中调用 (onsavenstancestate) 时，我尝试保存我的 editText 值，以便当弹出窗口关闭并重新启动它时，editText 的值将保持它的值一旦弹出窗口再次打开。

我已经尝试过 (onSaveInstanceState) 方法并且值保持不变；但是，一旦对话框再次启动，我仍然可以重新创建被破坏的内容。有人可以解释一下这个问题吗？

这是我的代码:

//===============================接口(interface)============= ========================//

        public interface NoticeDialogListener {
public void onDialogPositiveClick(DialogFragment dialog,EditText[] editText);
public void onDialogNegativeClick(DialogFragment dialog);
     }

//==========================MainActivity类================= ============//

    import android.os.Bundle;
    import android.support.v4.app.DialogFragment;
    import android.support.v4.app.FragmentActivity;
    import android.util.Log;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;


          public class MainActivity extends FragmentActivity implements   `               NoticeDialogListener{ 

     private  EditText[] _edText;
     private TextView _tv;

     private Multiplication multi;
     private Double[] s;
     private String s1;
     public static final String _SCORE1 = "score1";
     public static final String _SCORE2 = "score2";


     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);
                _tv = (TextView)findViewById(R.id.textView1);
               Button dAction = (Button)findViewById(R.id.button1);

                  s = new Double[2];


             dAction.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {//open();
        confirmFireMissiles();


        }

              });//ssetOnclickLi...
    ///success thank god.

            //===================================================//


              }
      public void confirmFireMissiles() {

    DialogFragment newFragment = new FireMissilesDialogFragment();
    newFragment.show(getSupportFragmentManager(),"ff");

         }//confirmFireMisslesClosing brace

         // The below is what happens when the Button "multiply" in 
             Dialog window pops up.
@Override
public void onDialogPositiveClick(DialogFragment dialog,EditText[] 
                     editText) {    


    _edText = editText; // is this association

         multi = new Multiplication();
       try{ 
      // gets the text and stores to string array.

          s[0]=Double.parseDouble(_edText[0].getText().toString());
     s[1]=Double.parseDouble(_edText[0].getText().toString());
     Log.d("hello", String.valueOf(s[0]));


    }catch(NumberFormatException e){
              _tv.setText("please Insert an Number and calculate  again"); // 
        Log.d("Error", "place in numbers please");
    } 
        s1 = String.valueOf(multi.multiply(s[0],s[1]));
        //set Textview to s1.
                 _tv.setText(s1);
             }
@Override
public void onDialogNegativeClick(DialogFragment dialog) {}

//=========================================== ===================================// 公共(public)类 FireMissilesDialogFragment 扩展 DialogFragment { 私有(private) AlertDialog.Builder 生成器； 私有(private) EditText[] _edText；//准备就绪时启用 私有(private)NoticeDialogListener _mListener； public static final String _SCORE1 = "score1"; public static final String _SCORE2 = "score2"; 私有(private)双 [] s;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the Builder class for convenient dialog construction
        builder = new AlertDialog.Builder(getActivity());
           //shows added content to dialog.
     //  d = new String[2];
             s = new Double[2];




    if(savedInstanceState !=null){


   s[0] =  Double.parseDouble(savedInstanceState.getString(_SCORE1));
  s[1] = Double.parseDouble(savedInstanceState.getString(_SCORE2));
       Log.d("Hey",String.valueOf(s[0]));

     _edText[0].setText(String.valueOf(s[0]));
        showIt();



    }else{
         showIt();

    }
          //sets the characterisitcs of  the dialogue.
        builder.setTitle("We are all stars of the show.");
        builder.setMessage( "we are strong")

             .setPositiveButton("Multiply", new  
               DialogInterface.OnClickListener(){
         public void onClick(DialogInterface dialog, int id) {

                    // enable when ready


   _mListener.onDialogPositiveClick(FireMissilesDialogFragment.this,_edText); 

                   }
               });

        // Create the AlertDialog object and return it

             return builder.create();
    }

 public  void showIt(){

//这段代码创建了一个线性布局，应该显示在对话框弹出窗口中。 LayoutParams param = new
LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1.0f); LinearLayout layout= new LinearLayout(getActivity()); layout.setLayoutParams(参数); layout.setOrientation(LinearLayout.VERTICAL); layout.setBackgroundColor(Color.BLACK);

          // Dynamically place EditText efficiently Inside Linear Layout.
          _edText = new EditText[4];
           for (int i = 0;i< _edText.length;i++) {

         _edText[i] = new EditText(getActivity());
         _edText[i].setInputType(InputType.TYPE_CLASS_NUMBER | 
              InputType.TYPE_NUMBER_FLAG_DECIMAL); 
         _edText[i].setTextSize(20)
        try{
         s[i] =Double.parseDouble(   
                                  _edText[i].getText().toString());
        }catch(NumberFormatException e){
        //  Log.d("hello", "wrong input");
        }
         layout.addView(_edText[i]);
            }
         builder.setView(layout);
            }
   //============================================== Look over this code======////////////
   @Override
    public void onAttach(Activity activity) {
       super.onAttach(activity);
         //Verify that the host activity implements the callback interface
        try {
          //   Instantiate the NoticeDialogListener so we can send events to the host
            _mListener = (NoticeDialogListener) activity;
        } catch (ClassCastException e) {
            // The activity doesn't implement the interface, throw exception
            throw new ClassCastException(activity.toString()
                   + " must implement NoticeDialogListener");
        }
    }


       @Override
   public void onSaveInstanceState(Bundle savedInstanceState) {
        // Save the user's current game state

            savedInstanceState.putDouble(_SCORE1,s[0]);
        savedInstanceState.putDouble(_SCORE2,s[1]);
        super.onSaveInstanceState(savedInstanceState);
    }

}

Answer 1

您或许可以使用 SharedPreferences 并将信息存储在那里，然后将文本编辑的文本设置为共享首选项的结果？还是我把整个想法都弄错了？

这里是一个简单的保存函数的例子:

  SharedPrefrences scores = getSharedPreferences("key_name_here", Context.MODE_PRIVATE);
  SharedPreferences.Editor editor = scores.edit();
  editor.putInt("key1", key1Var);
  editor.putInt("key2", key2Var);
  editor.commit();

并检索:

  Var = getPrefrences(Context.MODE_PRIVATE).getInt("key1",default value);

这应该可以解决问题