Android如何使用适配器for listView而不扩展listActivity

Question

我有一个带标签的应用程序.在一个选项卡中,我需要将数据(字符串)放在行中.为此,我选择tableLayout但是当我想contextmenu在其行上使用它时它不起作用.

我可以显示contextmenu onLongClick但问题是我无法获取有关所选行的信息以编辑或删除所选行.然后我在一个讨论中读到,使用listView比tablelayout我们有很多行更好.但我看到的例子有所延伸,listactivity但我不想这样做.

因此,当我尝试listView不延伸时,listactivity我不知道该怎么做我的意思是我以前从未使用listView过,所以我尝试在互联网上找到的不同的例子来理解它,但它不起作用.这是我到目前为止所做的listView:

String [] items=getRessources().getStringArray(R.arra.resolution);
 //Resolution is an array of strings
ListView lv=(ListeView) findViewById(R.id.listView);
v.setAdapter(new ArrayAdapter<string>(this, android.R.layout.simple_list_item_1, items);

当我编译它时,我得到一个包含我的数组元素的列表,但首先,我想改变我不能的文本颜色.其次,我想动态地将行添加到列表中,我不知道该怎么做.我想我必须用adapter它来做,但我不知道怎么做.有人可以指导我完成这个.我只是想知道如何将我的列表附加到一个adapter允许我动态添加行,添加contextMenu等的列表.

Answer 1

主要活动类:

import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;

public class SelectedActivity extends Activity {

private SelectedAdapter selectedAdapter;
private ArrayList<String> list;

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

    // populate the model - a simple a list
    list = new ArrayList<String>();
    list.add("Apple");
    list.add("Orange");
    list.add("Grape");
    list.add("Grape1");
    list.add("Grape2");
    list.add("Grape3");
    list.add("Grape4");
    list.add("Grape5");
    list.add("Grape6");

    // create our SelectedAdapter
    selectedAdapter = new SelectedAdapter(this,0,list);
    selectedAdapter.setNotifyOnChange(true);

    ListView listview = (ListView) findViewById(R.id.listExample);
    listview.setAdapter(selectedAdapter);

    listview.setOnItemClickListener(new OnItemClickListener() {
        //@Override
        public void onItemClick(AdapterView arg0, View view,
                                       int position, long id) {
            // user clicked a list item, make it "selected"
            selectedAdapter.setSelectedPosition(position);
        }
    });
}

适配器类:

   import java.util.List;
    import android.content.Context;
    import android.graphics.Color;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.TextView;

    public class SelectedAdapter extends ArrayAdapter{

        // used to keep selected position in ListView
        private int selectedPos = -1;   // init value for not-selected

        public SelectedAdapter(Context context, int textViewResourceId,
                       List objects) {
             super(context, textViewResourceId, objects);
        }
        public void setSelectedPosition(int pos){
        selectedPos = pos;
             // inform the view of this change
             notifyDataSetChanged();
        }
        public int getSelectedPosition(){
             return selectedPos;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
                 View v = convertView;
                 // only inflate the view if it's null
                 // if (v == null) {
                        LayoutInflater vi =   (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                        v = vi.inflate(R.layout.selected_row, null);
                 //  }

                 // get text view
                     TextView label = (TextView)v.findViewById(R.id.txtExample);
                     Button btn=(Button)v.findViewById(R.id.btn1);

                     // change the row color based on selected state
                     if(selectedPos == position){
                        label.setBackgroundColor(Color.CYAN);
                        btn.setBackgroundResource(R.drawable.next);
                     }
                     else{
                        label.setBackgroundColor(Color.WHITE);
                     }

                     label.setText(this.getItem(position).toString());       
                     return(v);
        }
}