Scroll View

Main Activity
package com.scrollview;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;

import com.squareup.picasso.Picasso;

import android.R.string;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;

public class MainActivity extends Activity {
Timer time=new Timer();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

final List<String> url = new ArrayList<String>();

url.add("http://androidexample.com/media/webservice/LazyListView_images/image0.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image1.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image2.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image3.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image7.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image4.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image0.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image1.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image2.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image3.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image7.png");
url.add("http://androidexample.com/media/webservice/LazyListView_images/image4.png");

LinearLayout main = (LinearLayout) findViewById(R.id.container1);

ImageView img11 = (ImageView) findViewById(R.id.imageView1);
Picasso.with(getApplicationContext()).load(url.get(0)).into(img11);


for (int i = 0; i < url.size(); i++) {

ImageView img = new ImageView(getApplicationContext());
img.setId(i);
RelativeLayout.LayoutParams mParms = new RelativeLayout.LayoutParams(
200, 200);
img.setLayoutParams(mParms);
img.setScaleType(ScaleType.FIT_XY);
Picasso.with(getApplicationContext()).load(url.get(i)).into(img);
img.setTag(url.get(i));
main.addView(img);

img.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

ImageView img = (ImageView) findViewById(R.id.imageView1);
Picasso.with(getApplicationContext())
.load(v.getTag().toString()).into(img);



time.cancel();


}
});

}


time.scheduleAtFixedRate(new TimerTask() {

@Override
public void run() {

runOnUiThread(new Runnable() {

@Override
public void run() {

Random r = new Random();
int i1 = r.nextInt((url.size()-1) - 0) + 0;
System.out.println(""+i1);
ImageView img11 = (ImageView) findViewById(R.id.imageView1);
Picasso.with(getApplicationContext()).load(url.get(i1)).into(img11);


}
});

}
}, 3000 ,3000);

}
}

Screen Shots

To show full size image of gallery images

Main Activity

package com.example.imagegallry;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import android.widget.GridView;

import android.widget.ListView;

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

        List<String> urls=new ArrayList<String>();

        urls.add("https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTaBYSb4nVQrEn2c2xAbrQlLmbBeWuHdwScXTP4ooVzUhC9ZfKzXA");        

        urls.add("https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRveXT-rTUftVUUbgbSTpYh1sVfFEOlah1yr1DPQ2ScY7dMR7gc");

        urls.add("https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRoijmXrh12Ux48kbZMPfLMlog6LatW2IplODMEX0IBqiI9JZaC");

        urls.add("https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSkep0_haj0l6RsmK922iADQjWj1r2MibNsbqsr6QFeLXk2TIPSSw");

        urls.add("https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcT0k39CFKC6dKMSaMXxIKA9UoNtLL-wzBwOAhf6o3gkmEvyzqnK6w");

        urls.add("https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcR0XcapD77nGfmhYvucYQyzq4W2VnrLij8BCANBuZGY-1tOqGht&reload=on");

      galleryadapter adp=new galleryadapter(urls, getApplicationContext());

      

          

           GridView g1=(GridView)findViewById(R.id.gridView1);

           g1.setAdapter(adp);  

           }

}

Gallery Adapter

package com.example.imagegallry;

import java.util.List;

import android.content.Context;

import android.content.Intent;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import com.squareup.picasso.Picasso;

public class galleryadapter extends BaseAdapter {

List<String> myimages;

Context ctx;

public galleryadapter(List<String> images, Context applicationContext) {

myimages = images;

this.ctx = applicationContext;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return myimages.size();

}

@Override

public Object getItem(int position) {

return null;

}

@Override

public long getItemId(int position) {

return 0;

}

@Override      

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

// TODO Auto-generated method stub

LayoutInflater li = (LayoutInflater) ctx

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

convertView = li.inflate(R.layout.gridlayout, null);

ImageView img = (ImageView) convertView.findViewById(R.id.imageView1);

Picasso.with(ctx).load(myimages.get(position)).into(img);

img.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Intent in=new Intent(ctx, MainActivityfull.class);

in.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

in.putExtra("img", myimages.get(position));

ctx.startActivity(in);

}

});

return convertView;

}

}

Main Activity full Image

package com.example.imagegallry;

import com.squareup.picasso.Picasso;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.ImageView;

import android.widget.Toast;

public class MainActivityfull extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main_activityfull);

String img = getIntent().getStringExtra("img");

Toast.makeText(getApplicationContext(), img, 2000).show();

ImageView imageView = (ImageView) findViewById(R.id.imageView1);

Picasso.with(getApplicationContext()).load(img).into(imageView);

}

}

Screen Shot of images in gallery

Screen Shot of full image

How to retrieve Data From Shared Preferences ?

Data can be retrieved from saved preferences by calling getString() (For string) method. This method should be called on Shared Preferences not on Editor.
// returns stored preference value
// If value is not present return second param value - In this case null

pref.getString("key_name", null); // getting String

pref.getInt("key_name", null); // getting Integer

pref.getFloat("key_name", null); // getting Float

pref.getLong("key_name", null); // getting Long

pref.getBoolean("key_name", null); // getting boolean

REGISTRATION SCREEN USING SHARED PREFERENCE

Main Activity

package com.example.share1;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
   
    private EditText uname;
    private EditText upass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
       
        SharedPreferences prf1 = getApplicationContext().getSharedPreferences("abc", 0);
        boolean isLogin=prf1.getBoolean("islogin", false);
        getui();
        if(isLogin==true)
        {
           
            Intent intent=new Intent(MainActivity.this,MainActivity1.class);
            startActivity(intent);
           
        }}
       
        public void getui()
        {
         uname=(EditText) findViewById(R.id.editText1);
         upass=(EditText) findViewById(R.id.editText2);
       
   
        }
       
        public void Registeration(View v)
        {
            Intent obj = new Intent(MainActivity.this, MainActivity1.class);
            startActivity(obj);
            }
        public void Login(View v)
        {
           
            SharedPreferences prf = getApplicationContext().getSharedPreferences("xyz", 0);
       
           
           
            String un=prf.getString("un", "");
            String up=prf.getString("up", "");
           
                if(un.equalsIgnoreCase(uname.getText().toString())&& up.equalsIgnoreCase(upass.getText().toString()))
                {
                    Toast.makeText(getApplicationContext(), "Login", Toast.LENGTH_LONG).show();
                   
                SharedPreferences prf1 = getApplicationContext().getSharedPreferences("abc", 0);
                    Editor edit = prf1.edit();
                    edit.putBoolean("islogin", true);
                    edit.commit();
                   
                   
                   
                }
                else
                {
                    Toast.makeText(getApplicationContext(), "Login failed", Toast.LENGTH_LONG).show();
                   
                }
           
        }       
           
    }

Main Activity 1

package com.example.share1;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity1 extends Activity {

   
     EditText uname;
     EditText upass;
     CheckBox ch;
     Button ok;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity1);

       
    }
    public void getui() {

         uname = (EditText) findViewById(R.id.editText1);
             upass = (EditText) findViewById(R.id.editText2);
            ok =(Button)findViewById(R.id.button1);
        }
   
    public void Registered(View v) {
        String name1 = uname.getText().toString();
        String pass1 = upass.getText().toString();
       
        if(name1.replace(" ","").length()==0 || pass1.replace(" ","").length()==0)
        {
            Toast.makeText(getApplicationContext(), "enter values", Toast.LENGTH_LONG).show();
        }
        else
        {
            SharedPreferences prf = getApplicationContext().getSharedPreferences("xyz", 0);
            Editor edit = prf.edit();
            edit.putString("un",name1);
            edit.putString("up", pass1);
            edit.commit();
           
            startActivity(new Intent(MainActivity1.this,MainActivity.class));
        }
     }
}

Main Activity 2

package com.example.share1;

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

public class MainActivity2 extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity2);

       
    }
    public void logout(View v)
    {
        SharedPreferences prf1 = getApplicationContext().getSharedPreferences(
                "abc", 0);
        prf1.edit().clear().commit();
       
        Intent intent=new Intent(MainActivity2.this,MainActivity.class);
        startActivity(intent);
    }
    }

   

How to store data in Shared Preference?

 Data can be saved  into shared preferences using editor. All the primitive data types like booleans, floats, ints, longs, and strings are supported. Call editor.commit() in order to save changes to shared preferences.

editor.putBoolean("key_name", true); // Storing boolean - true/false

editor.putString("key_name", "string value"); // Storing string

editor.putInt("key_name", "int value"); // Storing integer

editor.putFloat("key_name", "float value"); // Storing float

editor.putLong("key_name", "long value"); // Storing long

editor.commit(); // commit changes

Shared Preferences

SharedPreference is the simplest mechanism to store the data in android. You do not worry about creating the file or using files API.It stores the data in XML files. SharedPreference stores the data in key value pair.The SharedPreferences class allows you to save and retrieve key-value pairs of primitive data types. You can use SharedPreferences to save any primitive data: boolean, floats, int, longs, and strings.The data is stored in XML file in the directory data/data//shared-prefs folder.

Application of SharedPreference

• Storing the information about number of visitors (counter).
• Storing the date and time (when your Application is updated).
• Storing the username and password.
• Storing the user settings.

Example:

For storing the data we will write the following code in main activity on save button:

SharedPreferences sf=getSharedPreferences("MyData", MODE_PRIVATE);

SharedPreferences.Editored= sf.edit(); 

ed.putString("name", txtusername.getText().toString()); 

ed.putString("pass", txtpassword.getText().toString()); 

ed.commit();

In this example I have taken two activities. The first is MainActivity and the second one is SecondActivity.When user click on save button the user name and password that you have entered in textboxes, will be stored in MyData.xml file.

Here MyData is the name of XML file .It will be created automatically for you. 

MODE_PRIVATE means this file is used by your application only.

txtusernameand txtpassword are two EditText control in MainActivity.

For retrieving the data we will write the following code in SecondActiviy when user click on Load button:

Public static final String DEFAULT=”N? A”;

DEFAULT is a String type user defined global variable.If the data is not saved in XML file and user click on load button then your application will not give the error. It will show message “No Data is found”. Here name and pass are same variable that I have used in MainActivity.

SharedPreferences sf=getSharedPreferences("MyData", Context.MODE_PRIVATE);

String Uname=sf.getString("name", DEFAULT);

String UPass=sf.getString("pass", DEFAULT);

if(name.equals(DEFAULT)||Pass.equals(DEFAULT)) 

{

Toast.makeText(this, "No data is found", Toast.LENGTH_LONG).show(); 

}

else

{

Txtusername.setText(Uname);

Txtpassword.setText(UPass) ;

}

LIST VIEW USING BASE ADAPTER

MainActivity

 package com.example.baseadapter;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.widget.ListView;

public class MainActivity extends Activity {

    
  
    List<String> names=new ArrayList<String>();
    List<String> phoneNumber=new ArrayList<String>();
  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        readAllContacts();
    }

    private void readAllContacts() {
      
        Context ctx=getApplicationContext();
      
        ContentResolver cr = getContentResolver();
        Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
                null, null, null);
        if (cur.getCount() > 0) {
            while (cur.moveToNext()) {
                String id = cur.getString(cur
                        .getColumnIndex(ContactsContract.Contacts._ID));
                String name = cur
                        .getString(cur
                                .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                names.add(name);
              
                System.out.println("Name" + name);
                int hasPhoneNumber = Integer
                        .parseInt(cur.getString(cur
                                .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)));

                if (hasPhoneNumber > 0) {

                    // Query and loop for every phone number of the contact

                    Cursor phoneCursor = cr.query(
                            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                            null,
                            ContactsContract.CommonDataKinds.Phone.CONTACT_ID
                                    + " = ?", new String[] { id }, null);

                    phoneCursor.moveToNext();
                    String phomber = phoneCursor
                            .getString(phoneCursor
                                    .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                    phoneNumber.add(phomber);
                    System.out.println(" Phone number:" + phoneNumber);

                    //phoneCursor.close();
                }

                else {
                    phoneNumber.add("No Number");
                    System.out.println("No Number");
                }
            }
        }

      
      
      
        BaseAdp adp=new BaseAdp(names, phoneNumber, getApplicationContext());
        ListView lst=(ListView)findViewById(R.id.listView1);
        lst.setAdapter(adp);
      
      
      
      
    }
}

 Baseadapter Class

package com.example.baseadapter;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class BaseAdp extends BaseAdapter {

   
    List<String> names;
    List<String> phones;
    Context ctx;
   
    public BaseAdp(List<String> name, List<String> phn, Context cnt) {

       
        names=name;
        phones=phn;
        ctx=cnt;
       
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return phones.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
   
       
        LayoutInflater inflate=(LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView=inflate.inflate(R.layout.listitem, null);
       
        TextView txtName=(TextView)convertView.findViewById(R.id.textView1);
        TextView txtPhone=(TextView)convertView.findViewById(R.id.textView2);
       
        txtName.setText(names.get(position));
        txtPhone.setText(phones.get(position));
       
        Button btn=(Button)convertView.findViewById(R.id.button2);
        btn.setOnClickListener(new OnClickListener() {
           
            @Override
            public void onClick(View v) {
                Toast.makeText(ctx, position+"", Toast.LENGTH_SHORT).show();
               
                    names.remove(position);
                    phones.remove(position);
                    notifyDataSetChanged();
               
            }
        });
       
        return convertView;
       
    }

}