Android multiple screen example

Let we want constract an application which have two different screen and we want to move one screen to another scrren.



At first we need to constract this two screen individually, both screen should extends Activity.

After build two screen you add your new screen to AndroidManifest.xml file (first screen which extends Activity, it's automatically added to AndroidManifest.xml, but all new screen should be added individually).



//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="You are in the first Screen"
/>
<Button android:id ="@+id/btnClick"
   android:layout_width="150px"
   android:layout_height="50px"
   android:text="Open New Screen"
/>

</LinearLayout>

//AndroidMultipleScreenEasy.java

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

public class AndroidMultipleScreenEasy extends Activity
{
 MyNewScreen obB=new MyNewScreen();
   public void onCreate(Bundle icicle)
   {
      super.onCreate(icicle);
      setContentView(R.layout.main);
      
      Button b = (Button) findViewById(R.id.btnClick);
      b.setOnClickListener(new View.OnClickListener() {
      
         public void onClick(View arg0) {
         // here i call new screen;
         Intent i = new Intent(AndroidMultipleScreenEasy.this, MyNewScreen.class);
         startActivity(i);
         } 
      });
   }
}

//my_new_screen.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="You are in the New Screen, press close for back to previous screen" />
 <Button android:id="@+id/btnClick2" android:layout_width="100px"
  android:layout_height="50px" android:text="Close" />

</LinearLayout>

//MyNewScreen.java

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

public class MyNewScreen extends Activity
{
 AndroidMultipleScreenEasy ob;
   public void onCreate(Bundle icicle)
   {
      super.onCreate(icicle);
      setContentView(R.layout.my_new_screen);
      Button b = (Button) findViewById(R.id.btnClick2);
      b.setOnClickListener(new View.OnClickListener() {
         public void onClick(View arg0) {
   setResult(RESULT_OK);
         finish();
         } 
      });
   }
   
   public void setOb( AndroidMultipleScreenEasy obA){
    this.ob=obA;
   }
}

Add this line to your AndroidManifest.xml file.



//AndroidManifest.xml

<activity android:name=".MyNewScreen" android:label="MyNewScreenLabel"> </activity>

output:



Screen 1


Now you can goto new screen by clicking Open New Screen button.





Screen 2


Now you can goto previous screen by clicking Close button.

Android spinner example

Android Spinner help user to select an item from desired items. Here i implements OnItemSelectedListener geting the Spinner selected item. I also set Spinner selected item to a text view (code: selection.setText(items[position]);
). I used LinearLayout here, if you need better positioning you can use AbsoluteLayout.


//android_spinner.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:id="@+id/selection" android:layout_width="fill_parent"
  android:layout_height="wrap_content" />
 <Spinner android:id="@+id/spinner" android:layout_width="fill_parent"
  android:layout_height="wrap_content" android:drawSelectorOnTop="true" />
</LinearLayout>

//AndroidSpinner.java

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;

public class AndroidSpinner extends Activity implements OnItemSelectedListener {

 TextView selection;
 Spinner spin;
 String[] items = { "bangladesh", "bangla", "bd", "australia", "japan",
   "china", "indiaA", "indiaC" };

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.android_spinner);

  selection = (TextView) findViewById(R.id.selection);

  Spinner spin = (Spinner) findViewById(R.id.spinner);
  spin.setOnItemSelectedListener(this);

  ArrayAdapter<String> aa = new ArrayAdapter<String>(this,
    android.R.layout.simple_spinner_item, items);

  spin.setAdapter(aa);
 }

 @Override
 public void onItemSelected(AdapterView<?> parent, View v, int position,
   long id) {
  // TODO Auto-generated method stub
  selection.setText(items[position]);

 }

 @Override
 public void onNothingSelected(AdapterView<?> arg0) {
  // TODO Auto-generated method stub
  selection.setText("");

 }
}

output:

Android autocomplete

Android autocompete is very easy. You need to create a AutoCompleteTextView. In AutoCompleteTextView you can set completionThreshold from which character you want to get autocompletion help (here i set 1, means after pressig ist character you will get help for autocomplete).


//main.xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <TextView android:id="@+id/selection" android:layout_width="fill_parent"
  android:layout_height="wrap_content" />
 <AutoCompleteTextView android:id="@+id/edit"
  android:layout_width="150px" android:layout_height="wrap_content"
  android:completionThreshold="1" />
 <TextView android:id="@+id/myTextViev" android:layout_width="wrap_content"
  android:layout_height="wrap_content" android:layout_x="5px"
  android:layout_y="110px" />
 <Button android:id="@+id/myButton" android:layout_width="100px"
  android:layout_height="50px" android:text="Submit" android:layout_x="5px"
  android:layout_y="60px" />
</AbsoluteLayout>

//AutoComplete.java

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.TextView;

public class AutoComplete extends Activity implements TextWatcher,
  OnClickListener {
 TextView selection;
 AutoCompleteTextView edit;
 String[] items = { "bangladesh", "india", "pakistan", "australia", "japan",
   "china", "indiaA", "indiaC" };
 Button btn;
 TextView tv;

 @Override
 public void onCreate(Bundle icicle) {
  super.onCreate(icicle);
  setContentView(R.layout.main);
  selection = (TextView) findViewById(R.id.selection);
  edit = (AutoCompleteTextView) findViewById(R.id.edit);
  edit.addTextChangedListener(this);

  btn = (Button) findViewById(R.id.myButton);
  btn.setOnClickListener(this);
  tv = (TextView) findViewById(R.id.myTextViev);

  edit.setAdapter(new ArrayAdapter(this,
    android.R.layout.select_dialog_singlechoice, items));
 }

 public void onTextChanged(CharSequence s, int start, int before, int count) {
  // selection.setText(edit.getText());
 }

 public void beforeTextChanged(CharSequence s, int start, int count,
   int after) {
  // needed for interface, but not used
 }

 public void afterTextChanged(Editable s) {
  // needed for interface, but not used

 }

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  if (v.getId() == R.id.myButton) {
   tv.setText("get: "+edit.getText());
  }

 }
}

output:



Let you want to type bangladesh or bangla or bd, after pressed b you will get all autocomplete help