listView 添加addHeaderView和addFooterView以及handler.postDelayed的使用

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;

public class HeaderFooterDemo extends ListActivity {
    private static String[] items={"lorem",
                                                                    "pellentesque", "augue",
                                                                    "purus"};
    private long startTime=SystemClock.uptimeMillis();
    private Handler handler=new Handler();
    private AtomicBoolean areWeDeadYet=new AtomicBoolean(false);

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        getListView().addHeaderView(buildHeader());
        getListView().addFooterView(buildFooter());
        setListAdapter(new ArrayAdapter<String>(this,
                                                android.R.layout.simple_list_item_1,
                                                items));
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        areWeDeadYet.set(true);
    }

    private View buildHeader() {
        Button btn=new Button(this);

        btn.setText("Randomize!");
        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                List<String> list=Arrays.asList(items);

                Collections.shuffle(list);

                setListAdapter(new ArrayAdapter<String>(HeaderFooterDemo.this,
                                                        android.R.layout.simple_list_item_1,
                                                        list));
            }
        });

        return(btn);
    }

    private View buildFooter() {
        TextView txt=new TextView(this);

        updateFooter(txt);

        return(txt);
    }

    private void updateFooter(final TextView txt) {
        long runtime=(SystemClock.uptimeMillis()-startTime)/1000;

        txt.setText(String.valueOf(runtime)+" seconds since activity launched");

        if (!areWeDeadYet.get()) {
            handler.postDelayed(new Runnable() {
                public void run() {

                    updateFooter(txt);
                }
            }, 1000);
        }
    }
}

 

<?xml version="1.0" encoding="utf-8"?>
<ListView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:drawSelectorOnTop="true"
/>

 android:drawSelectorOnTop="false"注意这句话的意思 如果你设为true，那么选中的颜色会在上面 挡住button

设为false 则选中颜色在下面可以看见button 自己测试一下就明白了