Question

我希望用户选中与他相同的单选按钮在关闭应用程序之前进行过检查。

这是我的源代码

package com.example.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.example.myapplication.R;

public class MainActivity extends AppCompatActivity {

    RadioGroup radioGroup;
    RadioButton radioButton;
    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        radioGroup = findViewById(R.id.radioGroup);
        textView = findViewById(R.id.text_view_selected);

        Button buttonApply = findViewById(R.id.button_apply);
        buttonApply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int radioId = radioGroup.getCheckedRadioButtonId();

                radioButton = findViewById(radioId);

                textView.setText("Your choice: " + radioButton.getText());
            }
        });
    }

    public void checkButton(View v) {
        int radioId = radioGroup.getCheckedRadioButtonId();

        radioButton = findViewById(radioId);

        Toast.makeText(this, "Selected Radio Button: " + radioButton.getText(),
                Toast.LENGTH_SHORT).show();

    }
}

我希望单选按钮状态在下次应用程序时被保存使用。

Answer 1

您应该看看classpath 'com.android.tools.build:gradle:3.3.2'：https://developer.android.com/training/data-storage/shared-preferences

保存数据：

sharedPreferences

检索数据：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString("myRadio", radioButton.getText());
editor.commit();

目前，您可以执行以下操作：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
String defaultValue = "";
String radioButtonText = sharedPref.getString("myRadio", defaultValue);

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