Question

我正在尝试从ListView中单击按钮执行某些操作。点击按钮即可调用OnClickListener。

这是我的 MainActivity.java

公共类MainActivity扩展了Activity {

@Override
protected void onCreate(Bundle savedInstanceState)
{

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final ListView myListView = (ListView) findViewById(R.id.listView);
        final Button myButton = (Button) findViewById(R.id.button);
        //create the adapter
        final rowNumAdapter rownumadapter = new rowNumAdapter(this);
        myListView.setAdapter(rownumadapter);
        myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id)
            {


                if(position==0)
                {
                     Toast.makeText(MainActivity.this,"You just clicked"+ rownumadapter.getItem(position) , Toast.LENGTH_LONG).show();

                }

            }
        });
        myButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {

                rownumadapter.addrows();

            }
        });
}

}

这是我的 rowNumAdapter.java

公共类rowNumAdapter扩展了BaseAdapter {

private Context mContext;
private  int numrows;


public rowNumAdapter(Context context) {

    this.mContext=context;
    this.numrows= 5;

}
public void addrows()
{
    this.numrows+=1;
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return this.numrows;
}

@Override
public Object getItem(int position) {

    return null;
}

@Override
public long getItemId(int position) {

    return 0;
}

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

     Button view = null;
    if(convertView == null)
    {   
        view = new Button(this.mContext);
    }
    else
    {
        view = (Button)convertView;
    }

    view.setText(" row " + position);


    return view;
}

}

这是我的 activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="10dp"
android:paddingRight="15dp">

<Button
android:layout_marginTop="15dp"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Add View"
android:id="@+id/button"></Button>

<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="false"
android:clickable="false"
 >

</ListView>


</LinearLayout>

Answer 1

您必须使用适配器类中的getView方法。 Ref

它应该是这样的。

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) thisContext
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View vi = convertView;

    // your layout will be here
    vi = inflater.inflate(R.layout.activity_main, null);

    // Set your button id here 
    Button btnCheckin = (Button) vi.findViewById(R.id.btnCheckIn);

        btnCheckin.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                    Log.d("you clicked", "the item at [" + position
                            + "] position");
                   // your button action here.

            }
        });
    } 

    return vi;
}

Here是关于ListView和adapters的好教程。

ListView用于使用BaseAdapters的按钮

1 个答案: