为String [] android添加值

Question

我想动态地举例如下String[] images，但我无法实现它

String[] images = new String[] { "http://image/image1", "http://image/image1", "http://image/image1"};

我有一个json，其中包含图片网址，下面代码是我如何将json图片网址放到string[] images

 String[] images = new String[]{};

 for (int i = 0; i < contacts.length(); i++) {
     JSONObject c = contacts.getJSONObject(i);

     String imagepath = c.getString("imagepath");

     images[i] = imagepath; // trying to put the values to String[] images
     }

Answer 1

int lenth=contacts.length();

String[] images = new String[lenth];

 for (int i = 0; i < lenth; i++) {
     JSONObject c = contacts.getJSONObject(i);

     String imagepath = c.getString("imagepath");

     images[i] = imagepath ; // trying to put the values to String[] images
     }

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Answer 2

尝试使用Arraylist而不是数组

 ArrayList<String> arraylist=new ArrayList<>();
        for (int i = 0; i < contacts.length(); i++) {
            JSONObject c = contacts.getJSONObject(i);

            String imagepath = c.getString("imagepath");

            arraylist.add(imagepath);
        }

审核项目使用arraylist.get（i）;

Answer 3

在使用之前，您必须为String[]定义尺寸。

String[] images = new String[contacts.length()];

for (int i = 0; i < contacts.length(); i++) {
    JSONObject c = contacts.getJSONObject(i);
    String imagepath = c.getString("imagepath");
    images[i] = newURL; // trying to put the values to String[] images
}