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After working on various examples on ListView element from Android API,
I have tried to demonstrate a simple (at least I think so) file/folder
explorer user interface for showing list of files/folders those are
present under a folder as specified by the text box entry.



As depicted in the screen shown above, there is a EditText view, a button
and a ListView. These Android components are laid out using combination
of frame layout and linear layout. I have used a layout as shown below:



I have used FrameLayout->LinearLayout->EditText
                                     ->Button
                       ->LinearLayout->ListView

More details of the layout is as shown below:
main.xml					   

 
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#449955">
    <LinearLayout android:layout_gravity="top" 
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content">
      <EditText android:id="@+id/edTxt" 
                android:layout_width="200dip"
                android:layout_height="wrap_content"/>
      <Button android:id="@+id/btn" 
              android:layout_width="wrap_content"
              android:layout_height="wrap_content" 
              android:text="List"/>
    </LinearLayout>
    <LinearLayout android:layout_gravity="bottom" 
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content">
      <ListView android:id="@+id/listView" 
                android:layout_width="fill_parent"
                android:background="#334433" 
                android:layout_height="wrap_content"/>
    </LinearLayout>
    
</FrameLayout>


















This is the main Activity for the main screen with the Edit box and 
ListView component placed on the main FrameLayout instance.

OnClick listener is registered with the button instance, and is
over-ridden to provide onclick handler method. This method calls
helper class to bet list of folders and files present under the 
edit box supplied text. 

DirLister.java

 
package demo.dir.list;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class DirLister extends Activity {
    private DirAdapter dirAdapter = null;
    private ListView lstView = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        lstView = (ListView) findViewById(R.id.listView);
        Button btn = (Button) findViewById(R.id.btn);

        final EditText edTxt = (EditText) findViewById(R.id.edTxt);

        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                try {
                    String[] listFill = DirListHelper.getLabelsList(edTxt
                            .getText().toString());
                    if (dirAdapter == null) {
                        dirAdapter = new DirAdapter();
                    }
                    lstView.setAdapter(dirAdapter);
                    dirAdapter.setFiles(listFill);
                    dirAdapter.notifyDataSetChanged();

                } catch (Exception e) {
                    Toast.makeText(getApplicationContext(), e.getMessage(),
                            Toast.LENGTH_SHORT);

                }

            }

        });

    }

    private class DirAdapter extends BaseAdapter {

        private String[] files;

        public void setFiles(String[] argFiles) {
            this.files = argFiles;
        }

        @Override
        public int getCount() {
            if (files != null)
                return files.length;
            else
                return 0;
        }

        @Override
        public Object getItem(int position) {

            return null;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

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

            TextView txtView = new TextView(getApplicationContext());
            txtView.setText(files[position]);

            return txtView;
        }

    }
}



Following code is that of a helper class that just helps in finding list
of files and folders for a given folder path as argument to it.

DirListHelper.java

 
package demo.dir.list;

import java.io.File;
import android.content.Context;

public class DirListHelper {
    public DirListHelper(Context context) {
	}
	public static String[] getLabelsList(String path) throws Exception {
		String[] filesList = null;
		try {
			File file = new File(path);
			filesList = file.list();
		} catch(Exception ex) {
			throw ex;
		}
		return filesList;
	}
}





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References : 
Tags: TabHost and TabActivity Example on Android Platform
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Tags: Android Layout Example
Tags: Android Text To Speech Example

Tags: DOJO Example Dialog
Tags: DOJO Example Tree Widget
Tags: different logger file log4j
Tags: JDBC Transaction isolation
Tags: event handling java code
Tags: example quartz scheduler
Tags: example tag library web application
Tags: Flex
Tags: index
Tags: inmemory image creation java awt
Tags: JSF Example Main
Tags: JSF Example Tags CheckBoxes
Tags: JSF Example Tags dataTable
Tags: JSF Example Tags SelectBoxes
Tags: JSF Example Tags Walkthrough
Tags: JSF Example Validation
Tags: JSF Resource Bundle
Tags: log4j example 1
Tags: log4j example
Tags: Miscellaneous
Tags: Mule ESB File Transport
Tags: Mule ESB JMS Transport
Tags: stream download batch
Tags: sychronized block wait notify
Tags: thread wait notify example
Tags: using apache commons log
Tags: web load test
Tags: Wizard Framework Idea Java




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