android之PopUpWindow显示Listview（文件列表）

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/mainLayout"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <Button         android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="确定"        /></LinearLayout>

popupwindow.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" ><TextView     android:id="@+id/text"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="测试"    />    <ListView         android:id="@+id/list"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        ></ListView></LinearLayout>

mainActivity

package com.android.demo;import java.io.File;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.os.Environment;import android.view.LayoutInflater;import android.view.View;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.TextView;public class mainActivity extends Activity {private Button myButton;private String[] name;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                myButton = (Button)findViewById(R.id.button);        myButton.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubinitPopWindow();}});    }    private void initPopWindow(){        View contentView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.popupwindow, null);    contentView.setBackgroundColor(Color.BLUE);        PopupWindow popupWindow = new PopupWindow(findViewById(R.id.mainLayout), 200, 700);    popupWindow.setContentView(contentView);        TextView textView = (TextView) contentView.findViewById(R.id.text);    textView.setText("测试");    openDir();    ListView listView = (ListView) contentView.findViewById(R.id.list);    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, name);    listView.setAdapter(adapter);        popupWindow.setFocusable(true);    popupWindow.showAsDropDown(myButton);    }        private void openDir() { String rootPath = Environment.getExternalStorageDirectory().getAbsolutePath(); File file  = new File(rootPath); File[] files = file.listFiles(); name = new String[files.length]; for(int i=0;i<files.length;i++){ name[i]=files[i].getName(); System.out.println(name[i]); } }}

结果如图

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