View source for Java Android Hello World Instructions

* Create a new Android Virtual Device (AVD)

*  Create a new Android application project

*  Run and see the behavior

*  Check out src/com.example..., res/layout and res/values

* Make the layout linear and remove the text-box

* Add a button and an edit text with the following spec


      <EditText
          android:id="@+id/edit_message"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:hint="@string/enter_text" />

    <Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@string/button_text" />
 
        

* Add a method name (e.g., sendMessage) to handle the OnClick event of the button 

  android:onClick="sendMessage"
 
 
*  Add sendMessage to src/MainActivity

  public void sendMessage(View view) {
  }
	
* Include android.view.View (Ctrl+Shift+o)

* Add to the body of sendMessage: 

        	Intent intent = new Intent(this, ShowMessage.class);
		EditText editText = (EditText) findViewById(R.id.edit_message);
		String message = editText.getText().toString();
		intent.putExtra(EXTRA_MESSAGE, message);		
		startActivity(intent);

and to the class MainActivity:


    public final static String EXTRA_MESSAGE = "com.example.helloworld.MESSAGE";


* Add a new activity (New | Other| Activity)

* Add the following declarations to the new activity's onCreate():

    Intent intent = getIntent();
    String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
    
    TextView textView = new TextView(this);
    textView.setTextSize(40);
    textView.setText(message);

== [[PA 8001 Ed 2013|Back to Embedded Systems Programming]] ==