ListView制作简易文件管理器

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打开eclipse新建项目。在项目文件夹下res目录下layout找到main.xml，里面拖入三个控件，分别是：Button命名为btnUp，TextView命名为t1，ListView命名为listVeiw1。拖入控件后main.xml的代码如下：

<?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" >    <Button        android:id="@+id/btnUp"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="向上" />    <TextView        android:id="@+id/t1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView" />    <ListView        android:id="@+id/listView1"        android:layout_width="match_parent"        android:layout_height="wrap_content" >    </ListView></LinearLayout>

在main.xml同级目录新建item.xml，同时把item.xml布局格式改为RelativeLayout，选中主界面里面拖入三个控件，ImagView命名id为imgicon，TextView命名id为txtName，TextView命名id为txtSize，拖入控件后item.xml代码如下：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ImageView        android:id="@+id/imgicon"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:src="@drawable/ic_launcher" />    <TextView        android:id="@+id/txtName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true"        android:text="TextView" />    <TextView        android:id="@+id/txtSize"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/imgicon"        android:layout_alignParentRight="true"        android:text="TextView" /></RelativeLayout>

然后编辑java代码

FileListView3Activity.java代码如下

package lianghailiang.f;import java.io.File;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Button;import android.widget.ListView;import android.widget.TextView;public class FileListView3Activity extends Activity implements OnItemClickListener, OnClickListener {ListView lv;TextView t1;Button btnUp;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);           getObjFromID();        FileListAdapter da=new FileListAdapter(this);        lv.setAdapter(da);        lv.setOnItemClickListener(this);        da.scanFiles("/");        btnUp.setOnClickListener(this);        }                void getObjFromID()    {    t1=(TextView) findViewById(R.id.t1);    lv=(ListView) findViewById(R.id.listView1);    btnUp=(Button) findViewById(R.id.btnUp);    }public void onItemClick(AdapterView<?> parent, View arg1,int position, long id) {// TODO Auto-generated method stubFileListAdapter da=(FileListAdapter) lv.getAdapter();File f=da.list.get(position);if(f.isDirectory()){t1.setText(f.getPath());da.scanFiles(f.getPath());}}public void onClick(View arg0) {// TODO Auto-generated method stubFileListAdapter da=(FileListAdapter) lv.getAdapter();if(da.currPath.equals("/")) return;File f=new File(da.currPath);t1.setText(f.getParent());da.scanFiles(f.getParent());}}

FileListAdapter.java代码：

package lianghailiang.f;import java.io.File;import java.util.LinkedList;import java.util.List;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;public class FileListAdapter extends BaseAdapter{public Activity activity;public List<File> list=new LinkedList<File>();public String currPath;public FileListAdapter(Activity activity){this.activity=activity;}public void scanFiles(String path){list.clear();File dir=new File(path);File[] subFiles=dir.listFiles();if(subFiles!=null)for(File f:subFiles)list.add(f);this.notifyDataSetChanged();currPath = path;}public int getCount() {// TODO Auto-generated method stubreturn list.size();}public Object getItem(int arg0) {// TODO Auto-generated method stubreturn null;}public long getItemId(int position) {// TODO Auto-generated method stubreturn position;}public View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubView v=View.inflate(activity, R.layout.item, null);TextView txtName=(TextView) v.findViewById(R.id.txtName);ImageView imgIcon=(ImageView) v.findViewById(R.id.imgicon);File f=list.get(position);txtName.setText(f.getName());Bitmap bmp_folder=BitmapFactory.decodeResource(activity.getResources(), R.drawable.ic_launcher);Bitmap bmp_file=BitmapFactory.decodeResource(activity.getResources(), R.drawable.ic_launcher);if(f.isDirectory())imgIcon.setImageBitmap(bmp_folder);elseimgIcon.setImageBitmap(bmp_file);return v;}}

FileBean.java代码：

package lianghailiang.f;import java.io.File;import android.graphics.Bitmap;public class FileBean {private File file;private Bitmap icon;private String name;private String path;private String size;private String type;public File getFile() {return file;}public void setFile(File file) {this.file = file;}public Bitmap getIcon() {return icon;}public void setIcon(Bitmap icon) {this.icon = icon;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPath() {return path;}public void setPath(String path) {this.path = path;}public String getSize() {return size;}public void setSize(String size) {this.size = size;}public String getType() {return type;}public void setType(String type) {this.type = type;}}

到此基本完成，打开虚拟机运行，结果如下：