Question

我正在关注NewBoston教程（https://www.youtube.com/watch?v=nOdSARCVYic&list=PL6gx4Cwl9DGBsvRxJJOzG4r4k_zLKrnxl&index=48）

他展示了如何将图像放入列表中，但他从未展示过如何为每段文本分配不同的图像。

这是我的MainActivity。

public class MainActivity extends Activity {

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


    String[] Jobsites = {"River Park Place", "Mayfair", "Jameson House"};
    ListAdapter jobsiteAdapter = new CustomAdapter(this, Jobsites);
    ListView jobsiteListView = (ListView) findViewById(R.id.jobsiteListView);
    jobsiteListView.setAdapter(jobsiteAdapter);

    jobsiteListView.setOnItemClickListener(
            new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    String jobsite = String.valueOf(parent.getItemAtPosition(position));
                    //Toast.makeText(MainActivity.this, jobsite, Toast.LENGTH_LONG).show();
                    if (jobsite == "River Park Place"){
                        //Perform segue to the proper view where employess can sign in
                        //******************************************
                        System.out.println("*****************");
                        System.out.println("Attempting to segue");
                        System.out.println("*****************");



                        //******************************************
                    }else{
                        System.out.println("*****************");
                        System.out.println("These jobsites aren't avaliable yet!");
                        System.out.println("*****************");
                        Toast.makeText(MainActivity.this, "**These Sites aren't avaliable yet!**", Toast.LENGTH_LONG).show();
                    }
                }
            }
        );

    }
}

在视频中我们制作了一个处理图像的自定义视图。这是代码。

class CustomAdapter extends ArrayAdapter<String> {


public CustomAdapter(Context context, String[] jobsites) {
    super(context,R.layout.custom_row ,jobsites);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater jobsiteInflater = LayoutInflater.from(getContext());
    View customView = jobsiteInflater.inflate(R.layout.custom_row, parent, false);

    String singleJobsiteItem = getItem(position);

    ImageView josbiteImage = (ImageView) customView.findViewById(R.id.josbiteImage);

    josbiteImage.setImageResource(R.drawable.riverparkplace);


    return customView;

    }
}

我还要为列表中最下面的两个文本添加另外两个图像。现在它只是为列表中的所有三行反复加载SAME图片。

Answer 1

由于图像

，

You need to实现了baseadapter

Answer 2

让我一步一步指导您。在我们继续之前，您需要了解>map (("hello" !) . listIx) [0..5] [Just 'h',Just 'e',Just 'l',Just 'l',Just 'o',Nothing]的{{1}}使用您指定的数据填充每一行。换句话说，您希望将图像传递给适配器，就像使用case 'F': case 'f': if(start < end || (start < 0 && end < 0 && end > start)) // start < end or start = -3 and end = -7 { for (int i=start; i<=end; i+=inc) { System.out.print(i + " "); } } else if(start > end || (start < 0 && end < 0 && start > end)) // if start = - 7 and end = -3 { for (int i=end; i>=start; i-=inc) // should be greater than { System.out.print(i + " "); } } else if(start == end) { System.out.println(end); } String数组一样。

定义一个ArrayAdapter，其中包含您想要分配给它的字符串（ListView）和图片。
```
Jobsites
```

初始化适配器使用的simple wrapper object数组。在主要活动的Jobsites中，执行以下操作：

public class SimpleObject {

    private String jobSite;
    private int imageID; // your R.drawable.image

    public SimpleObject(String jobSite, int imageID) {
        this.jobSite = jobSite;
        this.imageID = imageID;
    }

    public String getJobSite() {
        return jobSite;
    }

    public int getImageID() {
        return imageID;
    }
}

现在，将SimpleObject改为onCreate()而不是ArrayList<SimpleObject> objectList = new ArrayList<>(); objectList.add(new SimpleObject("River Park Place", R.drawable.image1); objectList.add(new SimpleObject("Mayfair", R.drawable.image2); // the list goes on....：
```
CustomAdapter
```
现在确保使用新的SimpleObject列表初始化主活动中的适配器：
```
String
```

在ListView中加载多个图像

2 个答案: