Question

我无法访问gridview中的按钮。我的gridview使用customAdpater放置在对话框中。请帮我！！！以下是我的代码

1）在onCreate（）方法中：

    dialog = new Dialog(this);
            dialog.setContentView(R.layout.question_pallet);
            dialog.setTitle("Question Pallet...");
            gridView = (GridView) dialog.findViewById(R.id.grid_view);

            gridView.setAdapter(new ImageAdapter(QuestionBankActivity.this,allQuestions));
Button b = (Button) gridView.findViewWithTag("Hi"); //returning null
Button b = (Button) gridView.getChildAt(0); //returning null

2）question_pallet.xml就像这样

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/grid_view"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:numColumns="auto_fit"
    android:columnWidth="70dp"
    android:gravity="center"
    android:stretchMode="columnWidth" >  

</GridView>

3）我的grdview的ImageAdapter.java是

public class ImageAdapter extends BaseAdapter {
private Activity mContext;

List<GATEQuesAnswer> allQuestions;
static Button b[] = new Button[65] ;
int next_counter = 1;

private int pos;
// Constructor
public ImageAdapter(Activity c, List<GATEQuesAnswer> allgeteQuestions){
    mContext = c;
    allQuestions = allgeteQuestions;
}

public ImageAdapter(QuestionBankActivity questionBankActivity) {
    mContext = questionBankActivity;
}

@Override
public int getCount() {
    return 65;
}



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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {           
    Button button;
    //if (convertView == null) {
        button = new Button(mContext);
        button.setText(Integer.toString(pos++));
        button.setId(position);
        button.setTag("Hi");

    //}
    //else
    //{
        //button = (Button) convertView;
        //Log.i("mytag", b.length+"");
    //}

    button.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {


            ((QuestionBankActivity)mContext).navigate_to_ques(position+1);

        }
    });
    button.setLayoutParams(new GridView.LayoutParams(70, 70));
    return button;
}

@Override
public Object getItem(int arg0) {
    // TODO Auto-generated method stub
    return null;
}

}

我已尝试过所有可能性，例如为每个按钮提供唯一ID并使用gridview.findViewById（）或getChildAt（index）获取它，但没有任何工作:( 任何帮助将不胜感激！！！提前谢谢！

Answer 1

你的getView方法都错了，试试类似......

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

            ViewHolder holder = null;
            Log.v("ConvertView", String.valueOf(position));

            if (convertView == null) {
                LayoutInflater vi = (LayoutInflater) getActivity()
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = vi.inflate(R.layout.row, null);

                holder = new ViewHolder();
                holder.button = (Button) convertView
                        .findViewById(R.id.ID_OF_YOUR_BUTTON);
                holder.button.setTag("HI");
                convertView.setTag(holder);

                holder.button.setOnClickListener(new View.OnClickListener() {
                    public void onClick(View v) {
                              //DO YOUR CODE
                    }
                });

            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            return convertView;
        }
    }


private class ViewHolder {
                    Button button;
        }

//编辑

此外，您可以使用getChildAt（）迭代 GridView （或任何其他ViewGroup）的所有子项：

for(int i=0; i<gridView.getChildCount(); i++) {
    Button child = (Button) gridView.getChildAt(i);
    // do stuff with child view
}

row.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="5dp" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </Button>

</LinearLayout>

在Dialog android按钮的gridview内获取null视图

1 个答案: