Question

我正在创建自定义网格。每行有1个按钮和2个textviews。我试图以编程方式为每个值分配值/文本。我可以为两个文本视图设置文本，但是findviewbyId按钮返回null。

网格就像：

    <GridView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:numColumns="auto_fit"
        android:verticalSpacing="10dip"
        android:horizontalSpacing="10dip"
        android:stretchMode="columnWidth"
        android:gravity="center"
        android:background="#FFFFFF"
        android:padding="5dip"
        android:id="@+id/gvMYActivitySearch" />

行布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal">

    <Button
        android:id="@+id/btnHistory"
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:background="@drawable/button_background"
        android:text="History"/>  

    <TextView
        android:id="@+id/tvName"
        android:layout_width="wrap_content"
        android:layout_height="35dp" />

    <TextView
        android:id="@+id/tvContact"
        android:layout_width="wrap_content"
        android:layout_height="35dp" />

</LinearLayout>

自定义网格java文件就像

public class CustomGrid extends BaseAdapter {

private Context mContext;
private final String[] names;
private final String[] Contact;
private final String[] ID;

public CustomGrid(Context c,String[] names,String[] Contact, String[] ID ) {
    mContext = c;
    this.Contact = Contact;
    this.names = names;
    this.ID = ID;
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return names.length;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View grid;

    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) mContext
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        //grid = new View(mContext);
        grid = inflater.inflate(R.layout.myactivity_singlerow, null);

    } else {
        grid = (View) convertView;
    }

    TextView tvName = (TextView) grid.findViewById(R.id.tvName);
    TextView tvContact = (TextView) grid.findViewById(R.id.tvContact);
    Button btnHistory = (Button) grid.findViewById(R.id.btnHistory);
    tvName.setText(names[position]);
    tvContact.setText(Contact[position]);
    if(btnHistory!=null) {
        btnHistory.setId(Integer.parseInt(ID[position]));


        btnHistory.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        new MainActivity().testButton(view.getId());

                    }
                }
        );
    }

    return grid;
}

当我尝试调试时，我可以第一次看到位置是＆＃39; 0＆＃39;，btnHistory不为空。但在此之后当position为1时，btnHistory为null。

可能出现什么问题？当两个textview都不为null时，为什么btnHistory为null？

Answer 1

评论以改进您的代码：在getView

之外的某个地方回电

我的意思是：

   public class CustomGrid extends BaseAdapter implements OnClickListener {
        if(btnHistory!=null) {
            btnHistory.setId(Integer.parseInt(ID[position]));
            btnHistory.setTag((Integer)view.getId());

            btnHistory.setOnClickListener(this);
        }

        public void onClick(View v) {
          new MainActivity().testButton(v.getTag());
        }
    }

Grid布局中的按钮为null

1 个答案: