Question

请帮忙解决此问题我不会加载SharedPreferences 如果可以，请在回复中附上代码它只是一个点击应用程序，我希望它保存点击的分数每次从0加载时请帮我修复代码

import android.R.string;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

    int counter;
    Button add;
    TextView display;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LoadPrefs();
        counter = 0;
        add = (Button) findViewById(R.id.button1);
        display = (TextView) findViewById(R.id.textView1);
        add.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                counter++;
                display.setText("You Have " + counter);
                SavePrefs("click", display.getText().toString());
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;

    }


    private void LoadPrefs(){
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
        String name = sp.getString("click", "You Have zero");

}

    private void SavePrefs(String key, boolean value){
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
        Editor edit = sp.edit();
        edit.putBoolean(key, value);
        edit.commit();

}

    private void SavePrefs(String key, String value){
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
        Editor edit = sp.edit();
        edit.putString("click", "You Have zero");
        edit.commit();

}

}

Answer 1

您在致电counter后将LoadPrefs设为0。此外，您在加载首选项时未设置counter。

为了保存实际的int值（而不是显示字符串）并保持显示和保存的值同步，我会这样做：

public class MainActivity extends Activity {

    int counter;
    Button add;
    TextView display;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        add = (Button) findViewById(R.id.button1);
        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setCounter(counter + 1);
            }
        });
        display = (TextView) findViewById(R.id.textView1);
        loadCounter(); // must come after display is assigned
    }

    private void loadCounter(){
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
        setCounter(sp.getInt("click", 0));
    }

    private void setCounter(int value) {
        counter = value;
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);
        Editor edit = sp.edit();
        edit.put("click", counter);
        edit.apply(); // apply() is better than commit()
        display.setText("You Have " +
            (counter > 0 ? String.valueOf(counter) : "zero");
    }
}

有人可以帮我修复这段代码

1 个答案: