5_高级UI控件_2_上机课.ppt

2、ticfinalintDELETE_ID=Menu.FIRST+1;publicstaticfinalintEXIT_ID=Menu.FIRST+2;publicvoidonCreate(Bundleicicle){super.onCreate(icicle);setContentView(R.layout.main);}菜单实验步骤publicbooleanonCreateOptionsMenu(Menumenu){super.onCreateOptionsMenu(menu);menu.ad

3、d(0,ADD_ID,0,R.string.menu_add);menu.add(0,DELETE_ID,1,R.string.menu_delete);menu.add(0,EXIT_ID,2,R.string.menu_exit);returntrue;}publicbooleanonOptionsItemSelected(MenuItemitem){switch(item.getItemId()){caseADD_ID:setTitle("Insert...");break;caseDEL

4、ETE_ID:setTitle("Delete...");break;caseEXIT_ID:finish();break;}returnsuper.onOptionsItemSelected(item);}}菜单实验步骤Step-3:修改/res/values/strings.xml的內容：ex01

5、d">AddItemDelItemExitStep-4:运行。扩展任务研究理论课案例，把各种控件汇总到该案例中。未完成可以留到课后完成！编程实现颜色变幻①新建工程②修改mainActivity.java文件，添加12个TextView对象变量，一个LinearLayout对象变量、一个WC整数变量、一个LinearLay

6、out.LayoutParams变量。编程实现颜色变幻importandroid.app.Activity;importandroid.graphics.Color;importandroid.os.Bundle;importandroid.widget.LinearLayout;importandroid.widget.TextView;publicclassManyColorMEextendsActivity{/*定义使用的对象*/privateLinearLayoutmyLayout;pr

7、ivateLinearLayout.LayoutParamslayoutP;privateintWC=LinearLayout.LayoutParams.WRAP_CONTENT;privateTextViewblack_TV,blue_TV,cyan_TV,dkgray_TV,gray_TV,green_TV,ltgray_TV,magenta_TV,red_TV,transparent_TV,white_TV,yellow_TV;publicvoidonCreate(BundlesavedI

8、nstanceState){编程实现颜色变幻super.onCreate(savedInstanceState);myLayout=newLinearLayout(this);/*设置LinearLayout的布局为垂直布局*/myLayout.setOrientation(LinearLayout.VERTICAL);/*设置LinearLayout布局背景图片*/myLayout.setBackgroundResource(R.drawable.back);/*加载主屏布局*/setCont