在 Bundle 中传递一堆数组

Posted 2023-05-07

【中文标题】在 Bundle 中传递一堆数组

【英文标题】：Passing a Stack of Arrays in a Bundle

【发布时间】：2015-08-03 23:53:26

【问题描述】：

有谁知道如何将一堆整数数组放入一个包中，以便我可以将它们拉出来并再次恢复堆栈。我已经尝试过这样但它不起作用。

在 Bundle 中保存数组堆栈：

public Bundle returnBreakStackContents() 
        Bundle bundle = new Bundle();
        int count = breaksStack.size();//Count gives the Bundle Entry A Unique Key
        bundle.putInt("breakStackSize",count);
        while (!breaksStack.empty()) 
            //Get Break Array From Stack
            Integer[] a = breaksStack.pop();
            //Convert To List
            List b = Arrays.asList(a);
            //Convert To ArrayList
            ArrayList c = new ArrayList();
            c.addAll(b);
            //Save Break to the Bundle with a Unique Key
            bundle.putIntegerArrayList("breakArray" + count, c);
            count--;
        
        return bundle;
    

从包中拉出数组并再次恢复堆栈：

Bundle newBundle = savedInstanceState.getBundle("breakStack");
            if (newBundle != null) 
                int count = newBundle.getInt("breakStackSize");
                Toast.makeText(this,"Number of Breaks: " + count, Toast.LENGTH_SHORT).show();
                while (count > 0) 
                    ArrayList a = newBundle.getIntegerArrayList("breakArray" + count);
                    Integer[] b = new Integer[a.size()];
                    a.toArray(b);
                    bAdapter.getBreaksStack().push(b);
                    count--;
                
            

任何帮助将不胜感激。我似乎得到了一个空堆栈异常。但是，似乎对象正在进入堆栈，因为我已记录 Stack.size() 大于 0。

【参考方案1】：

java.util.Stack 扩展了 java.util.Vector，java.util.Vector 实现了 Serializable。所以可以直接放入Bundle中。

package com.example.testapp;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

import java.util.Stack;

public class MainActivity extends Activity 
    private static final String TAG = "MainActivity";

    private Stack<Integer> mStack;

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

        if (savedInstanceState != null) 
            mStack = (Stack) savedInstanceState.getSerializable("stack");
            Log.d(TAG, "Loaded stack from the saved state");
        
        if (mStack == null) 
            mStack = new Stack<Integer>();
            mStack.add(1);
            mStack.add(2);
            mStack.add(3);
            mStack.add(4);
            Log.d(TAG, "Created new stack");
        
        Log.d(TAG, "mStack=" + mStack);
    

    @Override
    protected void onSaveInstanceState(Bundle outState) 
        super.onSaveInstanceState(outState);
        outState.putSerializable("stack", mStack);