Android学习笔记7——常用控件

1.TextView

2.EditView

3.Button

4.RadioButton

5.Checkbox

6.Toast

7.ProgressBar

8.ListView

 

4.RadioButton

需结合布局文件里需结合RadioGroup使用

RGrp_Methods = (RadioGroup)findViewById(R.id.RGrp_Methods); RBtn_Multiply = (RadioButton)findViewById(R.id.RBtn_Multiply); RBtn_Divide = (RadioButton)findViewById(R.id.RBtn_Divide); RBtn_Add = (RadioButton)findViewById(R.id.RBtn_Add); RBtn_Minus = (RadioButton)findViewById(R.id.RBtn_Minus); RGrp_Methods.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { // TODO Auto-generated method stub } });

复写listener的函数跟Button的稍许不同，跟设置的连在一起，跟checkbox类似

 

5.Checkbox

ToastOrIntent = (CheckBox)findViewById(R.id.ToastOrIntent); ToastOrIntent.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub System.out.println("CheckBox -> ToastOrIntent"); Toast.makeText(hello.this, R.string.str_UseToast, Toast.LENGTH_SHORT).show(); } });

复写listener的函数跟Button的稍许不同，跟设置的连在一起，跟RadioButton类似

同时注意的是，checkbox集成了CompoundButton的listener，它自己没有listener

 

6.Toast

弹出的msgbox，一回会消失

Toast.makeText(hello.this, R.string.str_UseToast, Toast.LENGTH_SHORT).show();

7.ProgressBar

有两种，一种横的，一种圆的

横的可以显示进度，圆的一直在转

8.ListView

1）新建一个Arraylist，然后插到Adapter里面

     关键是ArrayList的理解，

     结构

     ArrayList

           HashMap

                   String，String（键值对）

2）需要两个xml，一个是listActivity，一个是list里面的textView布局

setContentView(R.layout.listact); ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>(); HashMap<String,String> map1 =new HashMap<String,String>(); HashMap<String,String> map2 =new HashMap<String,String>(); HashMap<String,String> map3 =new HashMap<String,String>(); map1.put("user_name", "胡锦涛"); map1.put("user_num", "13456789012"); map2.put("user_name", "奥巴马"); map2.put("user_num", "14567890123"); map3.put("user_name", "我"); map3.put("user_num", "15678901234"); list.add(map1); list.add(map2); list.add(map3); SimpleAdapter listAdapter = new SimpleAdapter(this, list, R.layout.listuser, new String[]{"user_name", "user_num"}, new int[]{R.id.user_name, R.id.user_num}); setListAdapter(listAdapter);

listAct.java

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:id="@+id/ListLinearLayout" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ListView android:id="@id/android:list" android:orientation="vertical" android:layout_height="wrap_content" android:layout_width="fill_parent" android:scrollbars="vertical" android:drawSelectorOnTop = "false" > </ListView> </LinearLayout> </LinearLayout>  

listact.xml(注意要用小写，听说，否则R.java不能生成)

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal"> <TextView android:id="@+id/user_name" android:layout_width="180dip" android:layout_height="30dip" android:textSize="10pt" android:singleLine="true" /> <TextView android:id="@+id/user_num" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="10pt" /> </LinearLayout> 

listuser.xml(是list里面的textview布局)

效果图(点击瞬间)