Android listview中有2种不同的布局

我所拥有的

我有一个导航抽屉，它的列表视图是定制的。第一行有imageview，其他行有textview。我的适配器代码如下：

public class drawer_list_adapter extends BaseAdapter {

Context context;
String[] nv_items;
int[] pro_pic;
LayoutInflater layoutInflater;

public drawer_list_adapter(Context context, String[] nv_items) {
    this.context = context;
    this.nv_items = nv_items;
    this.layoutInflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
    return 4;
}

@Override
public Object getItem(int position) {
    return position;
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public int getViewTypeCount() {
    return 4;
}

@Override
public int getItemViewType(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder dLI;

    if (convertView == null) {
        if (getItemViewType(position) == 0){
            convertView = layoutInflater.inflate(R.layout.drawer_pro_pic, parent, false);
            dLI = new ViewHolder();
            convertView.setTag(dLI);
        }
         else {
            convertView = layoutInflater.inflate(R.layout.drawer_list_item, parent, false);
            dLI = new ViewHolder();
            convertView.setTag(dLI);
            dLI.items = (TextView) convertView.findViewById(R.id.drawer_list_text);
            dLI.items.setText(nv_items[position]);
        }
    }
    else {
        dLI = (ViewHolder) convertView.getTag();
    }

    return convertView;
}

public class ViewHolder {
    TextView items;
    }
}

在这里一切都很好

现在我想更改此listview中的图像。用户可以从galler中选择图像。我的代码如下：

private class DrawerItemClickListener implements AdapterView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {

        if (position == 0){
            Intent pickFromGallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
            startActivityForResult(pickFromGallery, OpenGallery);
        }
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
      if (requestCode == OpenGallery && resultCode == RESULT_OK){
            Uri pickedImage = data.getData();
            String[] filePath = {MediaStore.Images.Media.DATA};
            Cursor cursor = getContentResolver().query(pickedImage, filePath, null, null, null);
            cursor.moveToFirst();
            String imagePath = cursor.getString(cursor.getColumnIndex(filePath[0]));
            pro_pic_selected.setImageBitmap(BitmapFactory.decodeFile(imagePath));
            cursor.close();
        }
    }

我的onCreate方法

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

    addTask = (Button) findViewById(R.id.addTask);
    addNote = (Button) findViewById(R.id.addNote);
    addNote.setOnClickListener(this);
    addTask.setOnClickListener(this);

    final ActionBar actionBar = getActionBar();
    actionBar.setHomeButtonEnabled(true);
    actionBar.setDisplayHomeAsUpEnabled(true);

    drawerLayout = (DrawerLayout) findViewById(R.id.NvDrawer);
    drawerList = (ListView) findViewById(R.id.drawer_list);
    drawer_list_adapter drawerListAdapter = new drawer_list_adapter(this, nv_items);
    drawerList.setAdapter(drawerListAdapter);
    drawerList.setOnItemClickListener(new DrawerItemClickListener());



    drawerToggle = new ActionBarDrawerToggle(this, drawerLayout,
            R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close);

    drawerLayout.setDrawerListener(drawerToggle);
}

---

任何帮助都将不胜感激。谢谢

您应该初始化onCreate方法中选择的ImageView pro_pic_。i、 e.您需要将该行置于pro_pic_selected=ImageView findviewbydr.id.ImageView；内部onCreate。如果您想在类中的任何位置使用该视图，可以在类do_it_主屏幕内的类作用域中声明它。另外，请确保在layout R.layout.activity\u do\u it\u main\u屏幕中有一个ID为ImageView的ImageView，否则findViewById将返回null。

通过这种方式，命名约定将有所帮助，不管怎样，这是do\u it\u main\u屏幕中的第54行。javapro\u pic\u selected=ImageView findViewByIdR.ID.ImageView；pro_pic_selected.setImageResourceR.drawable.cake；这个。忽略此bcoz我这样做只是为了看看当我从绘图设备中选择图像时它是否有效。如果没有该代码，错误会出现在这里pro_pic_selected.setImageBitMapFactory.decodeFileimagePath；第54号。。。。是第一线还是第二线？也是第二行。基本上，错误来自为我的imageView设置图像的代码

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

    addTask = (Button) findViewById(R.id.addTask);
    addNote = (Button) findViewById(R.id.addNote);
    addNote.setOnClickListener(this);
    addTask.setOnClickListener(this);

    final ActionBar actionBar = getActionBar();
    actionBar.setHomeButtonEnabled(true);
    actionBar.setDisplayHomeAsUpEnabled(true);

    drawerLayout = (DrawerLayout) findViewById(R.id.NvDrawer);
    drawerList = (ListView) findViewById(R.id.drawer_list);
    drawer_list_adapter drawerListAdapter = new drawer_list_adapter(this, nv_items);
    drawerList.setAdapter(drawerListAdapter);
    drawerList.setOnItemClickListener(new DrawerItemClickListener());



    drawerToggle = new ActionBarDrawerToggle(this, drawerLayout,
            R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close);

    drawerLayout.setDrawerListener(drawerToggle);
}