Question

我试图加载SharedPreferences但共享首选项永远不会被找到，我试图从另一个类更新它，但这不起作用。我也使用lst适配器列表vieew。以下代码的任何想法？我得到了列表视图的备用hello字符串。

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;


public class WorldMenu extends  ListActivity{
SharedPreferences prefs = null;
String splitter;
String[] worldList;
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

}

@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    context = getBaseContext();
    prefs = context.getSharedPreferences("worldString", 1);
    splitter =  "Create World," + prefs.getString("worldString", "hello");
    worldList = splitter.split(",");
    setListAdapter(new ArrayAdapter<String>(WorldMenu.this,
 android.R.layout.simple_list_item_1, worldList));
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    // TODO Auto-generated method stub
    super.onListItemClick(l, v, position, id);
    if(position == 0){
        Intent openWorldNamer = new Intent("this works no need to check");
        startActivity(openWorldNamer);
    }

}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    finish();
}

}

编辑更新程序类：

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class WorldCreator extends Activity{
EditText worldNameEditor;
Button saver;
SharedPreferences prefs;
OnSharedPreferenceChangeListener listener;
String updater2;
Editor editor;
String updater;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_worldcreator);
    prefs = PreferenceManager.getDefaultSharedPreferences(this);
    worldNameEditor = (EditText) findViewById(R.id.hello);
    saver = (Button) findViewById(R.id.button1);
    updater2 = worldNameEditor.getText().toString() + ",";

saver.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        updater = updater2;
        editor = prefs.edit();
        editor.putString("worldString", updater);
        editor.commit();
        Intent openListWorld = new
Intent("the list activity");
        startActivity(openListWorld);

    }});

    }
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();





    }





@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();

}
 }

Answer 1

在您创建偏好设置之前，它们不存在，因此您始终会看到"hello"。

以下是我用来设置值的一些代码：

SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
Editor editor = sharedPreferences.edit();
editor.putBoolean("LicenseAccepted", true);
editor.commit();

请注意，这不是使用命名文件，但概念是相同的： - ）

未找到共享首选项

1 个答案: