摘要： 通过上下文菜单修改桌面背景色,java代码如下public class MainActivity1 extends Activity { private static final int GREEN = 1; private static final int BLUE = 2; private static final int RED = 3; private LinearLayout ll; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreat... 阅读全文

摘要： 布局文件很简单java代码如下:public class ChronometerTest extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// 获取计时器组件final Chronometer ch = (Chronometer) findViewById(R.id.test);// 获取“开始”按钮Button start = (Button) findView 阅读全文