Create OptionsMenu using menu.add()

package com.OptionsMenu;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class OptionsMenu extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
  }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // TODO Auto-generated method stub
  menu.add(0, 0, 0, "Option 0");
  menu.add(0, 1, 1, "Option 1");
  menu.add(0, 2, 2, "Option 2");
  menu.add(0, 3, 3, "Option 3");
  menu.add(0, 4, 4, "Option 4");
  return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // TODO Auto-generated method stub
  switch(item.getItemId()){
  case (0):
   break;
  case (1):
   break;
  case (2):
   break;
  case (3):
   break;
  case (4):
   break;
  }
  return true;
 }
}

Create OptionsMenu in /res/menu/menu.xml

/workspace/OptionsMenu/res/menu/menu.xml

<?xml version="1.0" encoding="UTF-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:id="@+id/opt1"
       android:title="Option 1" />
 <item android:id="@+id/opt2"
       android:title="Option 2" />
 <item android:id="@+id/opt3"
       android:title="Option 3" />
 <item android:id="@+id/opt4"
       android:title="Option 4" />
 <item android:id="@+id/opt5"
       android:title="Option 5" />
</menu>

/workspace/OptionsMenu/src/com/OptionsMenu/OptionsMenu.java

package com.OptionsMenu;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class OptionsMenu extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
 }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
 // TODO Auto-generated method stub
 MenuInflater menuInflater = getMenuInflater();
 menuInflater.inflate(R.menu.menu, menu);
 return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
 // TODO Auto-generated method stub
 switch(item.getItemId()){
 case (R.id.opt1):
  break;
 case (R.id.opt2):
  break;
 case (R.id.opt3):
  break;
 case (R.id.opt4):
  break;
 case (R.id.opt5):
  break;
 }
 return true;
}
}

Related Post:
- Overwrite MENU key to create custom menu

AlertDialog.Builder - a simple way to create AlertDialog

eg.

package com.android.coding.HelloWorld;

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

public class HelloWorld extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
  
     Button button = (Button)findViewById(R.id.button);
     button.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
   new AlertDialog.Builder(HelloWorld.this)
         .setTitle("AlertDialog").setMessage("Hello!")
         .setPositiveButton("OK",
          new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog, int which) {
           }
           }).show();
  }});
 }
}

Make Android App in Landscape/Portrait

To force Android App working in Landscape/Portrait, you can modify the AndroidManifest.xml file, to add "android:screenOrientation" in <activity>.

It can be "unspecified", "user", "behind", "landscape", "portrait", "sensor" or "nosensor".

eg.

                    android:label="@string/app_name"
            android:screenOrientation="landscape"
            >
            
                
                
            
        

    

Change backbround color of activity

Changing of backbround color of activity can be achieved by assigning color value to "android:background" of the layout.

eg.

    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#e0e0ff"
    >

android:background may be a color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".