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)