android - 如何将arraylist <string>转换为string []

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Converting 'ArrayList<String> to 'String[]' in Java
                                
                                    （17个答案）
                                
                        
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public SampleGridViewAdapter(Context context,ArrayList<String> urls) {
    this.context = context;
    this .urls=urls;
    Log.i("DDDDDDDDDD",String.valueOf(urls));
    simpleArray = urls.toArray(new String[urls.size()]);
    Log.i("GGGGGGGGGGG",String.valueOf(simpleArray));
}

当我在日志中打印DDDDDDD时，输出是URL的数组列表，但是当我看到GGGGGGG时，它将更改为05-09 [Ljava.lang.String;@b125cf00

最佳答案

您可以执行此操作以将ArrayList转换为String []。

public SampleGridViewAdapter(Context context,ArrayList<String> urls) {
    this.context = context;
    this .urls=urls;
    Log.i("DDDDDDDDDD",String.valueOf(urls));
    String[] simpleArray = new String[urls.size()];
    simpleArray = urls.toArray(simpleArray);
    Log.i("GGGGGGGGGGG",String.valueOf(simpleArray));
}

或者您也可以这样-

public SampleGridViewAdapter(Context context,ArrayList<String> urls) {
    this.context = context;
    this .urls=urls;
     Log.i("DDDDDDDDDD",String.valueOf(urls));
     Object[] simpleArray = urls.toArray();

     for(int i = 0; i < simpleArray.length ; i++){
     Log.d("string is",(String)simpleArray[i]);
    }
  Log.i("GGGGGGGGGGG",String.valueOf(simpleArray));
}

关于android - 如何将arraylist <string>转换为string [] ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30136881/