creating a button

How to create a button in android

• Add a button to the main layout
• Add the button to the activity
• Label the button green
• Add a click listener to the activity

Step 1

1. open flash light activity
2. click on R. @ the set  content view and press f3 (setContentView(R.layout.main);

go to the main view and right under label red put your code : (<Button

    android:id="@+id/green_button"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

 android:text="@string/green"  )

(The “+” means that it’s the first time , I’m defining this id , so give me a new unique number identifier in the R-file.  Subsequently the + won’t be added if I need to put another id.)

(string name of green need to be created in string.xml to avoid error after typing the above code. (  <string name="green">Green</string>  )

3. Add a quick listener by going to myRedFlashLightActivity and type this code (Button greenButton = (Button)findViewById(R.id.green_button);

        greenButton.setOnClickListener(new View.OnClickListener() { ).

4. Run on emulator.

The outcome :