java - 保留编辑框android代码中的值

Question

我有这段代码，我想在更改或新 Activity 开始后保留第一个输入的编辑框值。

这段代码中发生了什么:

editbox1 = 1 > start new activity > back to recent activity > editbox1 = null

我需要这件事发生:

editbox1 = 1 > start new activity > back to recent activity > editbox1 = 1

代码

package org.example.touch;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.*;
import android.widget.EditText;


public class SettingsClass extends Activity {


    private EditText Alpha;
    private EditText Beta;
    private EditText Charlie;
    private EditText Delta;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings);

        Alpha = (EditText) findViewById(R.id.editText1);
        Beta = (EditText) findViewById(R.id.editText2);
        Charlie = (EditText) findViewById(R.id.editText3);
        Delta = (EditText) findViewById(R.id.editText4);    

    }

    public void buttonSBHandler (View view){        

        String Aint = Alpha.getText().toString();
        String Bint = Beta.getText().toString();
        String Cint = Charlie.getText().toString();
        String Dint = Delta.getText().toString();

        Intent startNewActivityOpen = new Intent(SettingsClass.this, GameUi.class);

        startNewActivityOpen.putExtra("Aint", Aint);
        startNewActivityOpen.putExtra("Bint", Bint);
        startNewActivityOpen.putExtra("Cint", Cint);
        startNewActivityOpen.putExtra("Dint", Dint);
        startActivityForResult(startNewActivityOpen, 0);
        //startActivity(new Intent(view.getContext(), GameUi.class));
        }
}

Answer 1

1) 一件事是您可以使用共享首选项将您的值存储在共享首选项中，并且在 oncreate() 方法上首先检查共享首选项是否为空，如果它不为空则从共享首选项中获取值。

或

2) 只需将编辑文本的那些数据设为静态即可-

static String Aint = Alpha.getText().toString();
      static   String Bint = Beta.getText().toString();
        static String Cint = Charlie.getText().toString();
       static String Dint = Delta.getText().toString();

因此，无论何时您返回 Activity ，编辑文本的先前数据都会显示在那里。希望这些东西能完美地为你工作。谢谢