我如何在Android Studio中改进这段SharedPrefence代码？

Question

如何改进这些代码？我试着在API29的应用程序上使用它，但每次我在构建后打开应用程序时，我的应用程序就崩溃了。我在Stackoverflow中找到了这些代码，但由于SharedPefrences等一些功能被弃用而不再工作，我尝试使用新的SharedPeference管理器，但应用程序仍然崩溃。

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

public class NavigatorActivity extends AppCompatActivity {

    public static final String KEY_CHOICE = "choice";

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

        // fetch the choice of the user, or return -1 if there is no choice yet
        SharedPreferences prefs = PreferenceManager
                .getDefaultSharedPreferences(this);
        int choice = prefs.getInt(KEY_CHOICE, -1);
        Intent intent = createIntentBasedOnChoice(this, choice);

        startActivity(intent);
        finish();
    }

    // this method returns an Intent based on the passed choice parameter
    public static Intent createIntentBasedOnChoice(Context context, int choice) {
        Intent intent;

        switch (choice) {
            case 1: {
                intent = new Intent(context, AspirantActivity.class);
                break;
            }
            case 2: {
                intent = new Intent(context, StudentActivity.class);
                break;
            }
            case 3: {
                intent = new Intent(context, AspirantActivity.class);
                break;
            }
            case 4: {
                intent = new Intent(context, StudentActivity.class);
                break;
            }
            default: {
                // if there is no choice yet, start the ChoiceActivity
                intent = new Intent(context, ChoiceActivity.class);
                break;
            }
        }
        return intent;
    }
}

然后我有choiceactivity，它应该指导用户选择一个布局为XML的选项。

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.Button;
import android.widget.RadioGroup;

public class ChoiceActivity extends AppCompatActivity {

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_choice);

        final RadioGroup choiceGroup = (RadioGroup) findViewById(
                R.id.group_choices);
        Button submitButton = (Button) findViewById(R.id.button_submit);

        submitButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int choice;

                switch (choiceGroup.getCheckedRadioButtonId()) {
                    case R.id.button_choice1: {
                        choice = 1;
                        break;
                    }
                    case R.id.button_choice2: {
                        choice = 2;
                        break;
                    }
                    case R.id.button_choice3: {
                        choice = 3;
                        break;
                    }
                    case R.id.button_choice4: {
                        choice = 4;
                        break;
                    }
                    default: {
                        choice = 1;
                        break;
                    }
                }

                // saving the choice of the user
                getSharedPreferences(
                        "com.sckoolboy.app_preferences", Context.MODE_PRIVATE)
                        .edit()
                        .putInt(NavigatorActivity.KEY_CHOICE, choice)
                        .apply();

                Intent intent = NavigatorActivity
                        .createIntentBasedOnChoice(ChoiceActivity.this, choice);

                startActivity(intent);
                finish();
            }
        });
    }
}

这是使用无线电组的ChoiceActivity的XML布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RadioGroup
        android:id="@+id/group_choices"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <RadioButton
            android:id="@+id/button_choice1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="Choice 1" />

        <RadioButton
            android:id="@+id/button_choice2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Choice 2" />

        <RadioButton
            android:id="@+id/button_choice3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Choice 3" />

        <RadioButton
            android:id="@+id/button_choice4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Choice 4" />

    </RadioGroup>

    <Button
        android:id="@+id/button_submit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is my choice!" />
</LinearLayout>

请问我什么是不对的，如何才能在我的应用程序中不崩溃的代码工作？

我们将非常感谢所有的帮助和帮助。

编辑：这里是堆栈跟踪

Fatal Exception: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.sckoolboy.app/com.sckoolboy.app.b0}; have you declared this activity in your AndroidManifest.xml?
       at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:2016)
       at android.app.Instrumentation.execStartActivity(Instrumentation.java:1673)
       at android.app.Activity.startActivityForResult(Activity.java:4689)
       at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:10)
       at android.app.Activity.startActivityForResult(Activity.java:4647)
       at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:10)
       at android.app.Activity.startActivity(Activity.java:5008)
       at android.app.Activity.startActivity(Activity.java:4976)
       at com.sckoolboy.app.Splash$1.run(Splash.java:11)
       at android.os.Handler.handleCallback(Handler.java:873)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:214)
       at android.app.ActivityThread.main(ActivityThread.java:7045)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)

Answer 1

我建议您使用Jetpack Datastore而不是SharedPreferences。这将解决所有API级别的特定问题。
链接：-https://developer.android.com/topic/libraries/architecture/datastore