Creating TextFile Dynamically and using in Android

Click Here to download source code

Package Name   :   selva.file

Project Name     :   File1

Version                   :   1.5 ( Supports 1.5 and above versions)


 main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Please enter some text"/>
    <EditText
    android:id="@+id/txtText1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
    <Button
    android:id="@+id/btnSave"
    android:text="Save"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
    <EditText
    android:id="@+id/txtText2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
    <Button
    android:id="@+id/btnLoad"
    android:text="Load"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
</LinearLayout>

 File1Activity.java

package selva.file;

import android.app.Activity;
import android.os.Bundle;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class File1Activity extends Activity
{
    private EditText textBox,textBox1;
    private static final int READ_BLOCK_SIZE = 100;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textBox = (EditText) findViewById(R.id.txtText1);
        textBox1 = (EditText) findViewById(R.id.txtText2);
        Button saveBtn = (Button) findViewById(R.id.btnSave);
        Button loadBtn = (Button) findViewById(R.id.btnLoad);
        saveBtn.setOnClickListener(new View.OnClickListener()
            {
            public void onClick(View v)
            {
                String str = textBox.getText().toString();
                try
                {
                    FileOutputStream fOut =openFileOutput("textfile.txt",MODE_WORLD_READABLE);
                    OutputStreamWriter osw = new OutputStreamWriter(fOut);
                    //---write the string to the file---
                    osw.write(str);
                    osw.flush();
                    osw.close();
                    //---display file saved message---
                    Toast.makeText(getBaseContext(),"File saved successfully!",Toast.LENGTH_SHORT).show();
                    //---clears the EditText---
                    textBox.setText("");
                }
                catch (IOException ioe)
                {
                    ioe.printStackTrace();
                }
            }
            });
        loadBtn.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View v)
            {
                try
                {
                    FileInputStream fIn =openFileInput("textfile.txt");
                    InputStreamReader isr = new InputStreamReader(fIn);
                    char[] inputBuffer = new char[READ_BLOCK_SIZE];
                    String s = "";
                    int charRead;
                    while ((charRead = isr.read(inputBuffer))>0)
                    {
                        //---convert the chars to a String---
                        String readString =String.copyValueOf(inputBuffer, 0,charRead);
                        s += readString;
                        inputBuffer = new char[READ_BLOCK_SIZE];
                    }
                    //---set the EditText to the text that has been
                    // read---
                    textBox1.setText(s);
                    Toast.makeText(getBaseContext(),"File loaded successfully!",Toast.LENGTH_SHORT).show();
                }
                catch (IOException ioe)
                {
                    ioe.printStackTrace();
                }
            }
        });
    }
}

 OUTPUT:

Enter some text and click save 

 

Click Load Button

 







































textfile.txt present in DDMS --> File Explorer --> selva.file (Your Package Name)

 --> File --> textfile.txt

open DDMS

Click File Explorer

Expand selva.file

Expand files

Click Here to download source code

Store Data in Mobile Memory using SharedPreference

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Package Name   :   selva.shared

Project Name     :   SharedPreferences

Version              :   1.5 ( Support 1.5 and above versions)

main.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:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

 
    <Button
        android:id="@+id/button1"
        android:layout_width="98dp"
        android:layout_height="wrap_content"
        android:text="Save" />

</LinearLayout>

m1.xml

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


    <Button
        android:id="@+id/button"
        android:layout_width="140dp"
        android:layout_height="wrap_content"
        android:text="View Saved Data" />
   
</LinearLayout>

SharedPreferencesActivity.java

package selva.shared;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class SharedPreferencesActivity extends Activity
{
     public SharedPreferences prefs;
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        Button btn=(Button) findViewById(R.id.button1);
       
      btn.setOnClickListener(new View.OnClickListener()
      {
       
        @Override
        public void onClick(View v)
        {
            // TODO Auto-generated method stub
       
               String str="www.androidprogramz.in";
                int no=234; 
                float fno=234.234f;
               
                prefs = getSharedPreferences("detail", MODE_PRIVATE);

                      // detail is sharedpreference name
                SharedPreferences.Editor editor = prefs.edit();
               
                editor.putString("Urlname",str);

                // To save str value in Urlname
                editor.putInt("Intvalue", no);

               // To save no value in Intvalue
                editor.putFloat("Floatvalue", fno);
                // To save fno value in Floatvalue
                editor.commit();
           
           
            Intent i=new Intent(SharedPreferencesActivity.this,Anotheractivity.class);
            startActivity(i);
           
        }
    });
       
       
    }
}

Anotheractivity.java

package selva.shared;

import android.app.Activity;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class Anotheractivity extends Activity
{
    public SharedPreferences prefs;
   
      public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.m1);
       
            Button btn=(Button) findViewById(R.id.button);
   
             prefs = getSharedPreferences("detail", MODE_PRIVATE);
            
                final String name=prefs.getString("Urlname", "novalue");

                     // To get name value from Urlname
               final int val=prefs.getInt("Intvalue", 0);

                       // To get val value from Intvlue
               final float fval=prefs.getFloat("Floatvalue", 0);
                      // To get fval value from Floatvalue
            btn.setOnClickListener(new View.OnClickListener()
            {
               
                @Override
                public void onClick(View v)
                {
                    // TODO Auto-generated method stub
                LinearLayout l=(LinearLayout) findViewById(R.id.linearlayout);
               
                TextView tv=new TextView(Anotheractivity.this);
                tv.setText(name);
                tv.setTextColor(Color.GREEN);
                l.addView(tv);
               
                TextView tv1=new TextView(Anotheractivity.this);
                tv1.setText(Integer.toString(val));
                tv1.setTextColor(Color.GREEN);
                l.addView(tv1);
               
                TextView tv2=new TextView(Anotheractivity.this);
                tv2.setText(Float.toString(fval));
                tv2.setTextColor(Color.GREEN);
                l.addView(tv2);
               
           
                }
            });
             
             
        }

}

   note : to clear sharedpreference 

               prefs = getSharedPreferences("detail", MODE_PRIVATE);

                    
                SharedPreferences.Editor editor = prefs.edit();
              

                editor.clear(); // to clear all values in detail                

                editor.commit();

   note 1: to remove one particular value

              prefs = getSharedPreferences("detail", MODE_PRIVATE);

                    
                SharedPreferences.Editor editor = prefs.edit();
              

                editor.remove("Urlname"); // to remove paricular value from detail                

                editor.commit();

  AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="selva.shared"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="3" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".SharedPreferencesActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
             android:label="@string/app_name"
             android:name=".Anotheractivity">
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

OUTPUT:

click save button and View Saved Data

Click Here to download source code

Create Html file and Displaying in Android

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Package Name   :  selva.web

Project Name     :  WebView2

Version               : 1.5 ( Supports 1.5 and above versions)

main.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:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <WebView android:id="@+id/webview1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

 Create ex.html under assets folder

<body>
<h1> Hi This is Simple Website </h1>
<a href="http://www.androidprogramz.in/"> Click Here </a>

</body>

 

 WebView2Activity.java

 package selva.web;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;

public class WebView2Activity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
      
        WebView wv = (WebView) findViewById(R.id.webview1);
        wv.loadUrl("file:///android_asset/ex.html");
 
    }
}

OUTPUT: 

 

click On Click Here

Click Here to Download Source Code

Display HTML content in Android using WebView

Click Here to download Source Code

Package Name  :  selva.web

Project Name   :  WebView

Version              :  1.5 ( Supports 1.5 and above versions)

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <WebView
     android:id="@+id/webview1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content" />
</LinearLayout>

WebViewActivity.java

package selva.web;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;


public class WebViewActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
                      
              
               WebView wv = (WebView) findViewById(R.id.webview1);
               final String mimeType = "text/html";
               final String encoding = "UTF-8";
         
               String html = "<H1>A simple HTML page</H1><body>" + "<p>Android tutorial  programs present in www.androidprogramz.in</p>";
               wv.loadDataWithBaseURL("", html, mimeType, encoding, "");
    }
  
}


OUTPUT :

Click Here to download Source Code

Display Images in GridView

Click Here to download Source Code


Package name  :  selva.image

Project name    :  ImageInGridView

Version             :  1.5 ( Supports 1.5 and above versions)
 

main.xml


 <?xml version="1.0" encoding="utf-8"?>
 <GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:columnWidth="90dp"
    android:stretchMode="columnWidth"
    android:gravity="center"/>

ImageInGridViewActivity.java

package selva.image;



import android.app.Activity;
import android.os.Bundle;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
public class ImageInGridViewActivity extends Activity
{

//---the images to display---
Integer[] imageIDs = {
        R.drawable.image1,
        R.drawable.image2,
        R.drawable.image3,
        R.drawable.image4,
        R.drawable.image5,
        R.drawable.image6,
};
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        GridView gridView = (GridView) findViewById(R.id.gridview);
        gridView.setAdapter(new ImageAdapter(this));
        gridView.setOnItemClickListener(new OnItemClickListener()
            {
                public void onItemClick(AdapterView<?> parent,View v, int position, long id)
                    {
                        Toast.makeText(getBaseContext(),"pic" + (position + 1) + "selected",Toast.LENGTH_SHORT).show();
                    }
            });
    }
    public class ImageAdapter extends BaseAdapter
    {
        private Context context;
        public ImageAdapter(Context c)
        {
            context = c;
        }
        //---returns the number of images---
        public int getCount()
        {
            return imageIDs.length;
        }
        //---returns the ID of an item---
        public Object getItem(int position)
        {
            return position;
        }
    //---returns the ID of an item---
        public long getItemId(int position)
        {
            return position;
        }
        //---returns an ImageView view---
        public View getView(int position, View convertView,ViewGroup parent)
        {
            ImageView imageView;
                if (convertView == null)
                {
                    imageView = new ImageView(context);
                    imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
                    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                    imageView.setPadding(5, 5, 5, 5);
                }
                else
                {

                imageView = (ImageView) convertView;
                }
                imageView.setImageResource(imageIDs[position]);
                return imageView;
        }
    }
}

OUTPUT :

click on image5

Click Here to download Source Code

Creating ImageSwitcher in Android

Click here To download Source Code

Package Name   :  selva.image

Project Name     :  ImageSwitcher

Version              :  1.5 ( Supports 1.5 and above versions) 


main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ff000000" >
    <Gallery
    android:id="@+id/gallery1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
    <ImageSwitcher
    android:id="@+id/switcher1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentBottom="true" />
</RelativeLayout>

 note : res --> values --> img.xml

img.xml 

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="Gallery1">
<attr name="android:galleryItemBackground" />
</declare-styleable>
</resources>

 ImageSwitcherActivity.java

package selva.image;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.AnimationUtils;
import android.widget.BaseAdapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Gallery;
import android.widget.ViewSwitcher.ViewFactory;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
public class ImageSwitcherActivity extends Activity implements ViewFactory {
//---the images to display---
Integer[] imageIDs = {
        R.drawable.image1,
        R.drawable.image2,
        R.drawable.image3,
        R.drawable.image4,
        R.drawable.image5,
        R.drawable.image6
};
private ImageSwitcher imageSwitcher;
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher1);
            imageSwitcher.setFactory(this);
            imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in));
            imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));
            Gallery gallery = (Gallery) findViewById(R.id.gallery1);
            gallery.setAdapter(new ImageAdapter(this));
            gallery.setOnItemClickListener(new OnItemClickListener()
            {
                public void onItemClick(AdapterView<?> parent,View v, int position, long id)
                    {
                        imageSwitcher.setImageResource(imageIDs[position]);

                    }
            });
        }
    public View makeView()
    {
        ImageView imageView = new ImageView(this);
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
        return imageView;
    }
    public class ImageAdapter extends BaseAdapter
    {
            private Context context;
            private int itemBackground;
            public ImageAdapter(Context c)
            {
                context = c;
                //---setting the style---
                TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
                itemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
                a.recycle();
            }
            //---returns the number of images---
            public int getCount()
            {
                return imageIDs.length;
            }
            //---returns the ID of an item---
            public Object getItem(int position)
            {
                return position;
            }
            public long getItemId(int position)
            {
                    return position;
            }
            //---returns an ImageView view---
            public View getView(int position, View convertView, ViewGroup parent)
            {
                ImageView imageView = new ImageView(context);
                imageView.setImageResource(imageIDs[position]);

                imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
                imageView.setBackgroundResource(itemBackground);
                return imageView;
            }
    }
}

OUTPUT: 

horizontal scroll and click on image

Click here To download Source Code

Creating Context Menu in Android

Click Here to download source code

Package Name   :   selva.contextmenu

Project Name     :    ContextMenu

Version              :    1.5 (Supports 1.5 and above versions)

main.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:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>

 ContextMenuActivity.java

package selva.contextmenu;

import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class ContextMenuActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button btn = (Button) findViewById(R.id.btn);
        btn.setOnCreateContextMenuListener(this);
    }
  
   
   
    @Override
    public void onCreateContextMenu(ContextMenu menu, View view,ContextMenuInfo menuInfo)
    {
    super.onCreateContextMenu(menu, view, menuInfo);
    CreateMenu(menu);
    }
    @Override
  
    public boolean onContextItemSelected(MenuItem item)
    {
    return MenuChoice(item);
    }
   
    private void CreateMenu(Menu menu)
    {
            MenuItem mnu1 = menu.add(0, 0, 0, "Item 1");
            {
                    mnu1.setAlphabeticShortcut('a');
                    mnu1.setIcon(R.drawable.image1);
            }
            MenuItem mnu2 = menu.add(0, 1, 1, "Item 2");
            {
                    mnu2.setAlphabeticShortcut('b');
                    mnu2.setIcon(R.drawable.image2);
            }
            MenuItem mnu3 = menu.add(0, 2, 2, "Item 3");
            {
                    mnu3.setAlphabeticShortcut('c');
                    mnu3.setIcon(R.drawable.image3);
            }
            MenuItem mnu4 = menu.add(0, 3, 3, "Item 4");
            {
                    mnu4.setAlphabeticShortcut('d');
            }
            menu.add(0, 4,4, "Item 5");
            menu.add(0, 5,5, "Item 6");
            menu.add(0, 6,6, "Item 7");
    }
    private boolean MenuChoice(MenuItem item)
    {
            switch (item.getItemId())
            {
            case 0:
                Toast.makeText(this, "You clicked on Item 1",Toast.LENGTH_LONG).show();
                return true;
            case 1:
                Toast.makeText(this, "You clicked on Item 2",Toast.LENGTH_LONG).show();
                return true;
            case 2:
                Toast.makeText(this, "You clicked on Item 3",Toast.LENGTH_LONG).show();
                return true;
            case 3:
                Toast.makeText(this, "You clicked on Item 4",Toast.LENGTH_LONG).show();
                return true;
            case 4:
                Toast.makeText(this, "You clicked on Item 5",Toast.LENGTH_LONG).show();
                return true;
            case 5:
                Toast.makeText(this, "You clicked on Item 6",Toast.LENGTH_LONG).show();
                return true;

            case 6:
                Toast.makeText(this, "You clicked on Item 7",Toast.LENGTH_LONG).show();
                return true;
            }
            return false;
    }

}

OUTPUT:

 Long Click Button

 click on item1

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