Touch Events

package com.sai.touch;


import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.widget.Toast;


public class TouchActivity extends Activity implements OnGestureListener {


private GestureDetector gestureDetector;


@Override


public void onCreate(Bundle savedInstanceState) {


super.onCreate(savedInstanceState);


setContentView(R.layout.main);


gestureDetector = new GestureDetector(this);


}


@Override


public boolean onTouchEvent(MotionEvent event) {


return gestureDetector.onTouchEvent(event);


}


@Override


public boolean onDown(MotionEvent e) {


Toast.makeText(this,"oNDown called",Toast.LENGTH_SHORT).show();


return false;


}


@Override


public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,


float velocityY) {


Toast.makeText(this,"oNFling called",Toast.LENGTH_SHORT).show();
return false;


}


@Override


public void onLongPress(MotionEvent e) {


Toast.makeText(this,"OnLongPress called",Toast.LENGTH_SHORT).show();


}


@Override


public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,


float distanceY) {


Toast.makeText(this,"onScroll called",Toast.LENGTH_SHORT).show();


return false;


}


@Override
public void onShowPress(MotionEvent e) {


Toast.makeText(this,"onShowPress called",Toast.LENGTH_SHORT).show();


}


@Override


public boolean onSingleTapUp(MotionEvent e) {


Toast.makeText(this,"oNsingleTap called",Toast.LENGTH_SHORT).show();




return false;
}


}

How to Create a Dialog Window and Start a new Activity on the Selection

Java Code:



package com.sai.sample;


import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;


public class DialogWindow extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialogscreen);


final String items[] = {"Iphone","Android","TMobile"};


AlertDialog.Builder ab=new AlertDialog.Builder(DialogWindow.this);
ab.setTitle("Title");
ab.setSingleChoiceItems(items, 0,new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// onClick Action
}
})
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {

if(items[0].contains("Iphone")){
startActivity(new Intent(DialogWindow.this,Iphone.class)); 
}

}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// on cancel button action
}
});
ab.show();
}
}

XMl Layout :

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

<LinearLayout

  xmlns:android="http://schemas.android.com/apk/res/android"

  android:orientation="vertical"

  android:layout_width="match_parent"

  android:layout_height="match_parent">

    <TextView 

    android:textAppearance="?android:attr/textAppearanceLarge"

android:text="Dialog Screen" 

android:id="@+id/textView1"

 android:layout_width="wrap_content" 

 android:layout_height="wrap_content"></TextView>

    

</LinearLayout>

Click on the Dialog Button.

Select the Iphone Radio button and click on the Ok Button to start the new Activity.

Login Page for Android

Java Code:




package com.sencide;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;


import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class AndroidLogin extends Activity implements OnClickListener {

Button ok,back,exit;
TextView result;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        // Login button clicked
        ok = (Button)findViewById(R.id.btn_login);
        ok.setOnClickListener(this);
       
        result = (TextView)findViewById(R.id.lbl_result);
       
    }
   
    public void postLoginData() {
        // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
       
        /* login.php returns true if username and password is equal to saranga */
        HttpPost httppost = new HttpPost("http://reddies.in/login.php");


        try {
            // Add user name and password
        EditText uname = (EditText)findViewById(R.id.txt_username);
        String username = uname.getText().toString();


        EditText pword = (EditText)findViewById(R.id.txt_password);
        String password = pword.getText().toString();
       
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("username", username));
            nameValuePairs.add(new BasicNameValuePair("password", password));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));


            // Execute HTTP Post Request
            Log.w("SENCIDE", "Execute HTTP Post Request");
            HttpResponse response = httpclient.execute(httppost);
           
            String str = inputStreamToString(response.getEntity().getContent()).toString();
            Log.w("SENCIDE", str);
           
            if(str.toString().equalsIgnoreCase("true"))
            {
            Log.w("SENCIDE", "TRUE");
            result.setText("Login successful");
            Intent intent = new Intent (AndroidLogin.this, Ok.class);
            startActivity(intent);
            finish();
           
            }else
            {
            Log.w("SENCIDE", "FALSE");
            result.setText(str);            
            }


        } catch (ClientProtocolException e) {
        e.printStackTrace();
        } catch (IOException e) {
        e.printStackTrace();
        }
    }

    private StringBuilder inputStreamToString(InputStream is) {
    String line = "";
    StringBuilder total = new StringBuilder();
    // Wrap a BufferedReader around the InputStream
    BufferedReader rd = new BufferedReader(new InputStreamReader(is));
    // Read response until the end
    try {
while ((line = rd.readLine()) != null) {
total.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
    // Return full string
    return total;
    }


@Override
public void onClick(View view) {
if(view == ok){
postLoginData();
}
}


}


XMl Layout:




<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<EditText android:layout_width="150px" android:layout_height="wrap_content" android:textSize="18sp" android:id="@+id/txt_username" android:layout_y="132dip" android:layout_x="128dip"></EditText>
<EditText android:layout_width="150px" android:layout_height="wrap_content" android:textSize="18sp" android:password="true" android:id="@+id/txt_password" android:layout_x="128dip" android:layout_y="192dip"></EditText>
<Button android:layout_width="100px" android:layout_height="wrap_content" android:id="@+id/btn_login" android:layout_x="178dip" android:layout_y="252dip" android:text="Login"></Button>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lbl_username" android:text="User Name" android:layout_x="37dip" android:layout_y="150dip"></TextView>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lbl_password" android:text="Password" android:layout_y="207dip" android:layout_x="50dip"></TextView>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lbl_top" android:textSize="16sp" android:typeface="sans" android:text="Please Loggin First" android:layout_x="29dip" android:layout_y="94dip"></TextView>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_y="312dip" android:layout_x="50dip" android:id="@+id/lbl_result"></TextView>
</AbsoluteLayout>

Username and Password are hardcoded in the php file as Username:sai krishna Password :hello123

How to Set a AlertDialog before closing the App

@Override
public void onBackPressed() {
   AlertDialog.Builder builder = new AlertDialog.Builder(this);
   builder.setMessage("Are you sure you want to exit?")
          .setCancelable(false)
          .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog, int id) {
                   FirstScreenActivity.this.finish();
              }
          })
          .setNegativeButton("No", new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog, int id) {
                   dialog.cancel();
              }
          });
   AlertDialog alert = builder.create();
   alert.show();


}

Android Grid View Gallery

XMl Layout:



<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" android:layout_height="wrap_content">


<ImageView android:id="@+id/ImageView01"
android:layout_width="fill_parent" 
android:layout_height="fill_parent"
android:layout_centerHorizontal="true" 
android:scaleType="fitXY"/>


<ScrollView android:id="@+id/ScrollView01"
android:layout_width="wrap_content" 
android:layout_below="@+id/ImageView01"
android:layout_height="fill_parent">


</ScrollView>


<Button android:id="@+id/Button01" 
android:layout_above="@id/ScrollView01"
android:layout_width="wrap_content" 
android:layout_height="wrap_content"
android:layout_centerHorizontal="true" 


android:text="Close" />





Java Source Code:



package com.sai.grid;


import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;


public class gridview extends Activity {
//---the thumbnail images to display---
Integer[] imageIDs = {
R.drawable.a_1, R.drawable.a_2, R.drawable.a_3, R.drawable.a_4,
R.drawable.sample_2, R.drawable.sample_3,
         R.drawable.sample_4, R.drawable.sample_5,
         R.drawable.sample_6, R.drawable.sample_7,
         R.drawable.sample_0, R.drawable.sample_1,
         R.drawable.sample_2, R.drawable.sample_3,
         R.drawable.sample_4, R.drawable.sample_5,
         R.drawable.sample_6, R.drawable.sample_7,
         R.drawable.sample_0, R.drawable.sample_1,
         R.drawable.sample_2, R.drawable.sample_3,
         R.drawable.sample_4, R.drawable.sample_5,
         R.drawable.sample_6, R.drawable.sample_7
};
//---the actual images to display---
Integer[] imageLargeIDs = {
R.drawable.a_1, R.drawable.a_2, R.drawable.a_3, R.drawable.a_4,
R.drawable.sample_2, R.drawable.sample_3,
         R.drawable.sample_4, R.drawable.sample_5,
         R.drawable.sample_6, R.drawable.sample_7,
         R.drawable.sample_0, R.drawable.sample_1,
         R.drawable.sample_2, R.drawable.sample_3,
         R.drawable.sample_4, R.drawable.sample_5,
         R.drawable.sample_6, R.drawable.sample_7,
         R.drawable.sample_0, R.drawable.sample_1,
         R.drawable.sample_2, R.drawable.sample_3,
         R.drawable.sample_4, R.drawable.sample_5,
         R.drawable.sample_6, R.drawable.sample_7
};


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//set up main content view
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)
{
                final Dialog dialog = new Dialog(gridview.this);
dialog.setContentView(R.layout.layoutdialog);
dialog.setTitle("Gallery Review");
dialog.setCancelable(true);


//set up image view
ImageView img = (ImageView) dialog.findViewById(R.id.ImageView01);
img.setPadding(5, 5, 5, 5);




img.setImageResource(imageLargeIDs[position]);


//set up button
Button button = (Button) dialog.findViewById(R.id.Button01);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
        dialog.dismiss();
}
});
//now that the dialog is set up, it's time to show it
dialog.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;
}


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(80,80));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setPadding(5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(imageIDs[position]);
return imageView;
}
}
}

Click on any one of the Image.

Android ListView with Searchbox Sort items

XML layout

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

<LinearLayout android:id="@+id/LinearLayout01"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical">

<EditText android:id="@+id/EditText01" 

android:layout_height="wrap_content" 

android:layout_width="fill_parent"

 android:hint="Search"></EditText>

<ListView android:id="@+id/ListView01"

android:layout_width="wrap_content"

android:layout_height="wrap_content" ></ListView>

</LinearLayout>

Java Source Code

package com.sai.sample;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.text.Editable;

import android.text.TextWatcher;

import android.widget.ArrayAdapter;

import android.widget.EditText;

import android.widget.ListView;

public class Sort extends Activity {

private  ListView listview;

private  EditText edittext;

private String list[]={"Iphone",

"Cupcake","Andoird","Blackberry","Samsung","Nokia"

   

    };

private ArrayList<String > arraylist= new ArrayList<String>();

private int textlenght=0;

@Override

   public void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.listview);

       

       listview=(ListView)findViewById(R.id.ListView01);

       edittext=(EditText)findViewById(R.id.EditText01);

       listview.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 , list));

       edittext.addTextChangedListener(new TextWatcher() {

@Override

public void onTextChanged(CharSequence s, int start, int before, int count) {

textlenght=edittext.getText().length();

arraylist.clear();

for(int i=0;i<list.length;i++){

if(textlenght<=list[i].length())

       {

       if(edittext.getText().toString().equalsIgnoreCase((String) list[i].subSequence(0, textlenght)))

       {

       arraylist.add(list[i]);

       }

       }

}

listview.setAdapter(new ArrayAdapter<String>(Sort.this,android.R.layout.simple_list_item_1 , arraylist));

}

@Override

public void beforeTextChanged(CharSequence s, int start, int count,

int after) {

// TODO Auto-generated method stub

}

@Override

public void afterTextChanged(Editable s) {

}

});

       

       }

}

Run as Android Application

How to Create a Radio Button

XML layout :



<?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"
    android:weightSum="1">
<TextView  
    android:layout_width="fill_parent" 
    android:text="This is a testing Example" 
    android:layout_height="wrap_content" android:layout_weight="0.04"/>
    
    
<Button android:layout_weight="0.04"
 android:text="Click" 
 android:id="@+id/button1" 
 android:layout_width="fill_parent" 
 android:layout_height="wrap_content">
 </Button>
<RadioGroup android:layout_weight="0.04" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
>


    <RadioButton android:id="@+id/radio0" 
    android:checked="false"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="YellAdworks,Bangalore" 
   >
    </RadioButton>
    
    <RadioButton android:id="@+id/radio1" 
    android:checked="false"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="YellAdworks,UK">
    </RadioButton>
    
</RadioGroup>


<TextView android:layout_weight="0.04" 
android:text="Selected is:" 
android:id="@+id/textView1"
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content">
 </TextView>

<Button android:layout_weight="0.04" 
android:text="Click for Confirmation" 
android:id="@+id/button2" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content">
</Button>




</LinearLayout>

Java Source Code

package com.sai.sample;

import android.app.Activity;

import android.app.ProgressDialog;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.RadioButton;

import android.widget.TextView;

public class YellAdworksActivity extends Activity implements OnClickListener  {

    /** Called when the activity is first created. */

private Button button1,confirm;

private RadioButton radio1,radio2;

    private ProgressDialog dialog;

    private TextView textview;

    

    

    

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        

         button1=(Button)findViewById(R.id.button1);

         confirm=(Button)findViewById(R.id.button2);

         button1.setOnClickListener(this);

         confirm.setOnClickListener(this);

         radio1=(RadioButton)findViewById(R.id.radio0);

         radio2=(RadioButton)findViewById(R.id.radio1);

         textview=(TextView)findViewById(R.id.textView1);

    }

    

@Override

public void onClick(View v) {

if(button1==v){

dialog = ProgressDialog.show(YellAdworksActivity.this, "!Loading",

        "Please wait for few seconds...", true);

new Thread(){

public void run(){

try{

startActivity(new Intent(YellAdworksActivity.this,SecondScreen.class)); 

}catch(Exception e){

 

}

dialog.dismiss();

}  

}.start();

}

if(confirm==v){

if(radio1.isChecked())

textview.setText("Selected is :" + radio1.getText());

if(radio2.isChecked())

textview.setText("Selected is :" + radio2.getText());

}

//Toast.makeText(YellAdworksActivity.this, "You have clicked the First Button", Toast.LENGTH_SHORT).show();

}

}

Run as Android Application

ProgressDialog on Starting a New Activity

@Override
public void onClick(View v) {
if(button1==v){

dialog = ProgressDialog.show(YellAdworksActivity.this, "!Loading",
        "Please wait for few seconds...", true);
new Thread(){
public void run(){
try{
startActivity(new Intent(YellAdworksActivity.this,SecondScreen.class)); 
}catch(Exception e){
 
}
dialog.dismiss();
}  
}.start();
 


//Toast.makeText(YellAdworksActivity.this, "You have clicked the First Button", Toast.LENGTH_SHORT).show();
}


ProgressDialog will be displayed when navigating from one activity to other..


Run as Android Application

How to Create a new Activity.

When the first button is clicked it should take us to the second screen. Lets see how this can be done.

We need to Create the Second screen now .
Create a new java file as well as the layout .

Lets Add  a image on the second screen.

Redirect to res/drawable-hdpi and paste the image and the Xml file of the second screen should look this way.

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

<LinearLayout

  xmlns:android="http://schemas.android.com/apk/res/android"

  android:orientation="vertical"

  android:layout_width="match_parent"

  android:background="@drawable/android"

  android:layout_height="match_parent">

    

</LinearLayout>

Now we need to start a new Activity on the Button Click.

 YellAdworksActivity.java file.

onClick() needs to be changed as :

@Override
public void onClick(View v) {
if(button1==v){
Intent intent= new Intent(YellAdworksActivity.this,SecondScreen.class);
startActivity(intent);
//Toast.makeText(YellAdworksActivity.this, "You have clicked the First Button", Toast.LENGTH_SHORT).show();
}

Run as Android Application:

Wow , A Critical Bug app force closed,But very simple to fix this Bug.

Just get into the AndroidManifest.xml file and Add the activity which your trying to start.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.sai.sample"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />


    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".YellAdworksActivity"
                  android:label="@string/app_name">
                  
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <activity android:name=".SecondScreen"
                  android:label="Image"/>
</application>

</manifest>

Click on the First Button redirects to the Second Screen.