Head Fisrt Android Development读书笔记（1）Adding Behavior

Make a button action

1. use the Button onClick attribute to declare the name of the action method

2.Open the Activity that displays the layout with the Button

3.Add a method with a name matching the onClick attribute value

4.Make sure that method takes in a single View as a parameter

@string/haiku:

find it at strings.xml

<string name="haiku">I dreamed of a phone</string>

android development refernece:

developer.android.com

android:visibility="invisible"

<Button ...

 android:onClick="onLoveButtonClicked">

The action method will be called on the activity that launched the screen.

public void onLoveButtonClicked(View view) {...}

From XML to Java (use the method: findViewById)

R file:

Button button = (Button) findViewById(R.id.Button01)