android HelloWorld

public class MainActivity extends Activity { 

	/* 定义TAG标签，这样可以很好的区分打印出来的log */
	private static final String	TAG	= "HelloAndroid";
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		/* 打印出不同的log信息 */
		Log.v(TAG, "VERBOSE");
		Log.d(TAG, "DEBUG");
		Log.i(TAG, "INFO");
		Log.w(TAG, "WARN");
		Log.e(TAG, "ERROR");
		/* 设置Activity要显示的布局为(R.layout.activity_main) */
		setContentView(R.layout.activity_main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}