Android学习笔记——Day3
7)AutoCompleteTextView(自动完成)
<?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">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="请输入你的查询条件:" />
<AutoCompleteTextView android:id="@+id/AutoCompleteTextView01"
android:layout_width="fill_parent" android:layout_height="wrap_content"></AutoCompleteTextView>
</LinearLayout>
public class AutoTextFrame extends Activity {
private String[] datas = {"abc","ade","bcd","bkff","akhlv"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.autocompletetextui);
AutoCompleteTextView autoText = (AutoCompleteTextView)this.findViewById(R.id.act_text);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,datas);
autoText.setAdapter(adapter);
}
}
8)日期选择器：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView android:id="@+id/ScrollView01"
android:layout_width="fill_parent" android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="请选择你的出生年月日:" />
<DatePicker android:id="@+id/DatePicker01"
android:layout_width="wrap_content" android:layout_height="wrap_content"></DatePicker>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="请选择你的出生时间:" />
<TimePicker android:id="@+id/TimePicker01"
android:layout_width="wrap_content" android:layout_height="wrap_content">
</TimePicker>
<Button android:text="确定" android:id="@+id/Button01"
android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>
</ScrollView>
public class ShowView extends Activity {
private DatePicker picker;
private TimePicker tp;
private Button button;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
picker = (DatePicker)this.findViewById(R.id.DatePicker01);
tp = (TimePicker)this.findViewById(R.id.TimePicker01);
button = (Button)this.findViewById(R.id.Button01);
picker.init(1982,6,12,null);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
int year = picker.getYear();
int m = picker.getMonth();
int d = picker.getDayOfMonth();
int h = tp.getCurrentHour();
int s = tp.getCurrentMinute();
setTitle("你的出生年月日为: "+year+"-"+m+"-"+d+" "+h+":"+s);
}
});
}
}
9)图片、图片按钮：
<?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">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="学习ImageView以及ImageButton的使用" />
<ImageView android:id="@+id/ImageView01"
android:layout_width="wrap_content" android:src="@drawable/map"
android:layout_height="wrap_content"></ImageView>
<ImageButton android:id="@+id/ImageButton01" android:src="@drawable/lostfocusimage"
android:layout_width="wrap_content" android:layout_height="wrap_content"></ImageButton>
</LinearLayout>
public class ShowView extends Activity {
/** Called when the activity is first created. */
private ImageButton button;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (ImageButton)this.findViewById(R.id.ImageButton01);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
setTitle("按了按钮");
}
});
}
}
10)tab面板：
<?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">
<!-- 每一个TextView对应一个Tab的内容 -->
<TextView android:text="这是Tab1的内容" android:id="@+id/TextView01"
android:layout_width="fill_parent" android:layout_height="fill_parent"></TextView>
<TextView android:text="这是Tab2的内容" android:id="@+id/TextView02"
android:layout_width="fill_parent" android:layout_height="fill_parent"></TextView>
<TextView android:text="这是Tab3的内容" android:id="@+id/TextView03"
android:layout_width="fill_parent" android:layout_height="fill_parent"></TextView>
<ImageView android:id="@+id/ImageView01" android:src="@drawable/map"
android:layout_width="wrap_content" android:layout_height="wrap_content"></ImageView>
</LinearLayout>
public class ShowImageSwitch extends TabActivity{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
// 获取TabHost
TabHost tabHost = this.getTabHost();
LayoutInflater.from(this).inflate(R.layout.main, tabHost.getTabContentView(),true);
// 最重要的代码是下面
tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("tab1").setContent(R.id.TextView01));
tabHost.addTab(tabHost.newTabSpec("tab2").setIndicator("tab2").setContent(R.id.TextView02));
tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab3").setContent(R.id.TextView03));
}
}
Toast t = Toast.makeText(this,"你已经登录到该系统了...",Toast.LENGTH_LONG);
t.show();
不同的Activity传递数据：
A、First Activity
Intent i = new Intent(this,ShowFrame.class);
Bundle b = new Bundle();
b.putString("shengao",shengao);
b.putString("sex",sex);
i.putExtras(b);
startActivityForResult(i,1);
B、Second Activity
Bundle b = this.getIntent().getExtras();
String shengao = b.getString("shengao");
String sex = b.getString("sex");
返回上一个Activity：
A、在第一个Activity调用startActivityForResult(..,..)，如：
public void onClick(View v) {
...
Intent i = new Intent(this,ShowFrame.class);
Bundle b = new Bundle();
b.putString("shengao",shengao);
b.putString("sex",sex);
i.putExtras(b);
startActivityForResult(i,1);
}
//该方法是第二个活动Activity单返回时被调用,requestCode是之前设置的值
public void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 1){
switch(resultCode){
case RESULT_OK:{
Bundle b = data.getExtras();
String shengao = b.getString("shengao");
String sex = b.getString("sex");
if(sex.equals("男")){
rb_1.setChecked(true);
}else{
rb_2.setChecked(true);
}
String tizhong = b.getString("tizhong");
setTitle("你的标准体重是:"+tizhong);
et.setText(shengao);
break;
}
}
}
}
B、在第二个Activity处理完数据之后，要消毁该屏幕对象
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
this.setResult(RESULT_OK,this.getIntent());
this.finish();
}
常用组件之二：
11) Menu 以及MenuItem
A、利用代码来增加菜单项：
<?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">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/hello" />
</LinearLayout>
public class MenuView extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
// 当客户按下手机的menu功能的时候会回调oncreateOptionsMenu方法
@Override
public boolean onCreateOptionsMenu(Menu menu) {
/*
* MenuItem add(int groupId,int itemId,int order,int titleRes)：
* 参数说明：
* 1)groupId：指菜单项所属的组id
* 2)itemId：设定菜单项的id,唯一标识该菜单项
* 3)order：设定菜单项在菜单中的位置
* 4)titleRes：设定菜单项上的内容
*/
menu.add(0,1,1,"添加").setIcon(R.drawable.ic_menu_agenda);
menu.add(0,2,2,"离开").setIcon(R.drawable.ic_menu_close_clear_cancel);
return super.onCreateOptionsMenu(menu);
}
// 定义menu响应单击事件
/*
* boolean onMenuItemSelected(int featureId, MenuItem item)
* featureId - 菜单所在的面板的id
item - 被选中的菜单项.
*/
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()){
case 1:{
setTitle("选择了添加");
break;
}
case 2:{
setTitle("选择了离开");
break;
}
}
return super.onOptionsItemSelected(item);
}
}
增加子菜单：
public boolean onCreateOptionsMenu(Menu menu) {
boolean result = super.onCreateOptionsMenu(menu);
SubMenu fileMenu = menu.addSubMenu("File");
SubMenu editMenu = menu.addSubMenu("Edit");
fileMenu.add("new");
fileMenu.add("open");
fileMenu.add("save");
editMenu.add("undo");
editMenu.add("redo");
return result;
}
B、利用xml文件来增加菜单项
i、在res新建一个menu目录,再建menu/menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/item01" android:title="你选择了增加"></item>
<item android:id="@+id/item02" android:title="你选择了离开"></item>
</menu>
ii、public class MenuView extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
//从menu.xml中读取菜单项
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case 1:{
setTitle("选择了添加");
break;
}
case 2:{
setTitle("选择了离开");
break;
}
}
return true;
}
}
//PreferencesActivity是Android 中专门用来实现程序设置界面及参数存储的一个Activity
/*PreferencesActivity常见的几个组件：
* PreferenceScreen：设置页面，可嵌套形成二级设置页面，用Title参数设置标题。
* PreferenceCategory：某一类相关的设置，可用Title参数设置标题。
* CheckBoxPreference：是一个CheckBox设置，只有两种值，true或false，
* 可用Title参数设置标题，用summaryOn和summaryOff参数来设置控件选中和未选中时的提示。
*/
public class Settings extends PreferenceActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/*
* The addPreferencesFromResource( ) method reads the settings
* definition from XML and inflates it into views in the current
* activity. All the heavy lifting takes place in the PreferenceActivity
* class.
*/
addPreferencesFromResource(R.xml.settings);
}
}
res/xml/settings.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<CheckBoxPreference android:title="@string/music_title"
android:key="music" android:summary="@string/music_summary" android:defaultValue="true"></CheckBoxPreference>
<CheckBoxPreference android:title="@string/hints_title"
android:key="hints" android:summary="@string/hints_summary" android:defaultValue="true"></CheckBoxPreference>
</PreferenceScreen>
12)、进度条、拖动条、星级：
A、进度条分类
长形进度条 （progressBarStyleHorizontal）
大圆形进度条（progressBarStyleLarge）
小圆形进度条 （progressBarStyleSmall）
默认风格 （progressBarStyle）
<?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"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<ProgressBar android:id="@+id/ProgressBar01" android:layout_width="200dp"
style="?android:attr/progressBarStyleHorizontal"
android:layout_height="wrap_content"
android:indeterminate="false"
android:visibility="gone"
></ProgressBar>
<ProgressBar android:id="@+id/ProgressBar02" android:layout_width="wrap_content"
android:max="100"
style="?android:attr/progressBarStyleLarge"
android:progress="50" android:secondaryProgress="70"
android:indeterminate="false"
android:visibility="gone"
android:layout_height="wrap_content"></ProgressBar>
<Button android:text="开始" android:id="@+id/Button01"
android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>
清单中，ProgressBar01为长形进度条，ProgressBar02为大圆形进度条，使用方法为声明“style=”在样式上加上各自属性，加载即可。
进度条主要属性方法
indeterminate
进度条分 不确定 （indeterminate=true）和 确定 （indeterminate=false）2种，默认值是（indeterminate=true）不确定
setMax
设置进度条的最大值，同时，确定（indeterminate=false）进度条中的最大值的设定，将调用 setMax()方法。
setProgress
Android 进度条中当前进度值的设置。
setSecondaryProgress
第二进度条的设置。
setVisibility
设置可见性。
<?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">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="圆形进度条" />
<ProgressBar android:id="@+id/ProgressBar01"
android:layout_width="wrap_content" android:layout_height="wrap_content"></ProgressBar>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="水平进度条" />
<ProgressBar android:id="@+id/ProgressBar02"
android:layout_width="200dip" style="?android:attr/progressBarStyleHorizontal"
android:max="100" android:progress="20" android:secondaryProgress="75"
android:layout_height="wrap_content"></ProgressBar>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="你选择的进度是" />
<SeekBar android:id="@+id/SeekBar01" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:max="100"
android:progress="30"></SeekBar>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="星级" />
<RatingBar android:id="@+id/RatingBar01"
android:layout_width="wrap_content" android:layout_height="wrap_content"></RatingBar>
</LinearLayout>
拖动条：SeekBar
<SeekBar android:layout_height="wrap_content"
android:layout_width="150px" android:max="100" android:id="@+id/sbMusic"></SeekBar>
//为拖条增加事件
musicSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
//用户停止拖动拖动时被调用...
public void onStopTrackingTouch(SeekBar seekBar) {
Toast t = Toast.makeText(ProgreeBarUI.this,"用户停止拖动拖动条...",Toast.LENGTH_SHORT);
t.show();
}
//用户开始拖动拖动时被调用...
public void onStartTrackingTouch(SeekBar seekBar) {
Toast t = Toast.makeText(ProgreeBarUI.this,"用户准备拖动拖动条...",Toast.LENGTH_SHORT);
t.show();
}
//用户拖动拖动过程中，拖动条的时改变时被调用...
/*
* 方法三个参数含义：
* seekBar - 目标拖动条
progress - 拖动条的当前进度
fromUser - True if the progress change was initiated by the user.
*/
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
seekBarText.setText("拖动条当前进度:"+progress+"%");
}
});
星级进度条：
<RatingBar android:id="@+id/RatingBar01"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:rating="1" android:numStars="3"></RatingBar>
public class ShowView extends Activity {
/** Called when the activity is first created. */
// 得到评级条
private RatingBar tbar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tbar = (RatingBar)this.findViewById(R.id.RatingBar01);
tbar.setRating(3.5f);// 这是用来设置评分等级的
}
}
