首先,我们总结一下我们学过的UI组件:
基本UI组件
Button:按钮
ImageButon :图片按钮
Imageview:图片视图
RadioButton:单选按钮
CheckBox:复选框
ToggleButton:多选按钮
TextView:文本框
EditText:文本编辑框
高级UI组件:
AutoComleteTextView:自动完成文本框
Spinner:下拉列表
DataPicker与TimePicker:时间日期选择框
PogressBar,RatingBar,SeekBar:进度条,星级条,拖动条
TabHost:选项卡
ListView:列表
ExpandableListView:可打开的列表
GridView:网格
ImageSwitch:图像切换器
Gallery:画廊
对话框:Dialog
菜单:Menu
Toast与Notification:
这些都是非常常见且经常被我们用到的UI组件,现在我们介绍另一个非常有用的UI组件,由于手机屏幕的限制,我们设计界面的时候不得不考虑屏幕的大小,因此,我们 可以使用ViewFlipper来显示视图,这样设计既使用又美观:
由于这种设计在购物App中很常见,我们设计了一个购物街程序来讲解这个这个UI组件。
这个组件其实很简单:我们在xml文件中来定义ViewFlipper:
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:id="@+id/title_ry"
>
<include layout="@layout/home_title_layout"/>
</RelativeLayout>
<LinearLayout
android:id="@+id/footbar_layout_ly"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
>
<include layout="@layout/home_footbar_layout"></include>"
</LinearLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/viewflipper_scrollview"
android:scrollbars="none"
android:focusable="false"
android:layout_above="@id/footbar_layout_ly"
android:layout_below="@id/title_ry">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ViewFlipper
android:id="@+id/mViewFliper_vf"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="match_parent"
android:layout_height="160dip"
android:background="@drawable/default_pic_1"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="160dip"
android:background="@drawable/default_pic_2"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="160dip"
android:background="@drawable/default_pic_3"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="160dip"
android:background="@drawable/default_pic_4"/>
</LinearLayout>
</ViewFlipper>
<LinearLayout
android:id="@+id/home_date_ratio_ly"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/mViewFliper_vf">
<include layout="@layout/home_data_bar"/>
</LinearLayout>
<LinearLayout
android:id="@+id/home_user_layout_ly"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/home_date_ratio_ly">
<include layout="@layout/home_user_layout"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/home_user_layout_ly">
<include layout="@layout/home_select_list_layout"/>
</LinearLayout>
</RelativeLayout>
</ScrollView>
</RelativeLayout>
主界面中在Scrollview里面定义了ViewFlipper,这样我们可以同时设置OnTouchListener();
我们看到在LinearLayout里面我们还include了一些界面设计文件,由于不是本文介绍终点,故不作赘述。
我们在主Activity中来设置了一些OnClickListener(),OnTouckListener()来控制用户的交互动作:
import java.util.Calendar;
import java.util.Date;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.GestureDetector.OnGestureListener;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ViewFlipper;
public class TestUIActivity extends Activity implements OnGestureListener, OnTouchListener {
private TextView date_TextView;
private ImageButton set_ImageButton, regist_ImageButton, login_ImageButton;
private ViewFlipper viewFlipper;
private boolean showNext = true;
private boolean isRun = true;
private int currentPage = 0;
private final int SHOW_NEXT = 0011;
private static final int FLING_MIN_DISTANCE = 50;
private static final int FLING_MIN_VELOCITY = 0;
private GestureDetector mGestureDetector;
private LinearLayout home_img_bn_Layout, style_img_bn_layout, cam_img_bn_layout, shopping_img_bn_layout, show_img_bn_layout;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
date_TextView = (TextView) findViewById(R.id.home_date_tv);
date_TextView.setText(getDate());
set_ImageButton = (ImageButton) findViewById(R.id.title_set_bn);
set_ImageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
toastInfo("设置属性");
}
});
regist_ImageButton = (ImageButton) findViewById(R.id.home_bn_regist);
regist_ImageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
toastInfo("注册按钮");
}
});
login_ImageButton = (ImageButton) findViewById(R.id.home_bn_login);
login_ImageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
toastInfo("登录按钮");
}
});
//为底部选择框设置监听器
home_img_bn_Layout = (LinearLayout) findViewById(R.id.bottom_home_layout_ly);
home_img_bn_Layout.setOnClickListener(clickListener_home);
style_img_bn_layout = (LinearLayout) findViewById(R.id.bottom_style_layout_ly);
style_img_bn_layout.setOnClickListener(clickListener_style);
cam_img_bn_layout = (LinearLayout) findViewById(R.id.bottom_cam_layout_ly);
cam_img_bn_layout.setOnClickListener(clickListener_cam);
shopping_img_bn_layout = (LinearLayout) findViewById(R.id.bottom_shopping_layout_ly);
shopping_img_bn_layout.setOnClickListener(clickListener_shopping);
show_img_bn_layout = (LinearLayout) findViewById(R.id.bottom_show_layout_ly);
show_img_bn_layout.setOnClickListener(clickListener_show);
//视图切换
viewFlipper = (ViewFlipper) findViewById(R.id.mViewFliper_vf);
mGestureDetector = new GestureDetector(this);
viewFlipper.setOnTouchListener(this); //设置触摸监听器
viewFlipper.setLongClickable(true); //设置长按监听器
viewFlipper.setOnClickListener(clickListener); //设置按下监听器
displayRatio_selelct(currentPage);
MyScrollView myScrollView = (MyScrollView) findViewById(R.id.viewflipper_scrollview);
myScrollView.setOnTouchListener(onTouchListener);
//设置手势侦探
myScrollView.setGestureDetector(mGestureDetector);
thread.start();
}
private OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
toastInfo("点击事件");
}
};
private OnTouchListener onTouchListener = new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return mGestureDetector.onTouchEvent(event);
}
};
Handler mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch (msg.what) {
case SHOW_NEXT:
if (showNext) {
showNextView();
} else {
showPreviousView();
}
break;
default:
break;
}
}
};
private String getDate(){
Date date = new Date();
Calendar c = Calendar.getInstance();
c.setTime(date);
String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
int w = c.get(Calendar.DAY_OF_WEEK) - 1 ;
if (w < 0) {
w = 0;
}
String mDate = c.get(Calendar.YEAR)+"年" + c.get(Calendar.MONTH) + "月" + c.get(Calendar.DATE) + "日 " + weekDays[w];
return mDate;
}
private OnClickListener clickListener_home = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
home_img_bn_Layout.setSelected(true);
style_img_bn_layout.setSelected(false);
cam_img_bn_layout.setSelected(false);
shopping_img_bn_layout.setSelected(false);
show_img_bn_layout.setSelected(false);
Intent intent = new Intent();
intent.setClass(TestUIActivity.this, MyActivity.class);
intent.putExtra("clickble", true);
startActivity(intent);
home_img_bn_Layout.setSelected(false);
}
};
private OnClickListener clickListener_style = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
home_img_bn_Layout.setSelected(false);
style_img_bn_layout.setSelected(true);
cam_img_bn_layout.setSelected(false);
shopping_img_bn_layout.setSelected(false);
show_img_bn_layout.setSelected(false);
toastInfo("点击我的家有跳转");
}
};
private OnClickListener clickListener_cam = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
home_img_bn_Layout.setSelected(false);
style_img_bn_layout.setSelected(false);
cam_img_bn_layout.setSelected(true);
shopping_img_bn_layout.setSelected(false);
show_img_bn_layout.setSelected(false);
toastInfo("点击我的家有跳转");
}
};
private OnClickListener clickListener_shopping = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
home_img_bn_Layout.setSelected(false);
style_img_bn_layout.setSelected(false);
cam_img_bn_layout.setSelected(false);
shopping_img_bn_layout.setSelected(true);
show_img_bn_layout.setSelected(false);
toastInfo("点击我的家有跳转");
}
};
private OnClickListener clickListener_show = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
home_img_bn_Layout.setSelected(false);
style_img_bn_layout.setSelected(false);
cam_img_bn_layout.setSelected(false);
shopping_img_bn_layout.setSelected(false);
show_img_bn_layout.setSelected(true);
toastInfo("点击我的家有跳转");
}
};
//重写OnGestureListener的一些方法
//
@Override
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
@Override
//GestureListener的onFling()方法
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
Log.e("view", "onFling");
if (e1.getX() - e2.getX()> FLING_MIN_DISTANCE
&& Math.abs(velocityX) > FLING_MIN_VELOCITY ) {
Log.e("fling", "left");
showNextView();
showNext = true;
// return true;
} else if (e2.getX() - e1.getX() > FLING_MIN_DISTANCE
&& Math.abs(velocityX) > FLING_MIN_VELOCITY){
Log.e("fling", "right");
showPreviousView();
showNext = false;
// return true;
}
return false;
}
@Override
public void onLongPress(MotionEvent e) {
// TODO Auto-generated method stub
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onShowPress(MotionEvent e) {
// TODO Auto-generated method stub
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
// TODO Auto-generated method stub
return false;
}
//重写了onTouchLisetner的这些方法
//
//重写OnTouchListener的onTouch()方法
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return mGestureDetector.onTouchEvent(event);
}
Thread thread = new Thread(){
@Override
public void run() {
// TODO Auto-generated method stub
while(isRun){
try {
Thread.sleep(1000 * 8);
Message msg = new Message();
msg.what = SHOW_NEXT;
mHandler.sendMessage(msg);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
//
private void showNextView(){
viewFlipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));
viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));
viewFlipper.showNext();
currentPage ++;
if (currentPage == viewFlipper.getChildCount()) {
displayRatio_normal(currentPage - 1);
currentPage = 0;
displayRatio_selelct(currentPage);
} else {
displayRatio_selelct(currentPage);
displayRatio_normal(currentPage - 1);
}
Log.e("currentPage", currentPage + "");
}
private void showPreviousView(){
displayRatio_selelct(currentPage);
viewFlipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));
viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));
viewFlipper.showPrevious();
currentPage --;
if (currentPage == -1) {
displayRatio_normal(currentPage + 1);
currentPage = viewFlipper.getChildCount() - 1;
displayRatio_selelct(currentPage);
} else {
displayRatio_selelct(currentPage);
displayRatio_normal(currentPage + 1);
}
Log.e("currentPage", currentPage + "");
}
private void displayRatio_selelct(int id){
int[] ratioId = {R.id.home_ratio_img_04, R.id.home_ratio_img_03, R.id.home_ratio_img_02, R.id.home_ratio_img_01};
ImageView img = (ImageView)findViewById(ratioId[id]);
img.setSelected(true);
}
private void displayRatio_normal(int id){
int[] ratioId = {R.id.home_ratio_img_04, R.id.home_ratio_img_03, R.id.home_ratio_img_02, R.id.home_ratio_img_01};
ImageView img = (ImageView)findViewById(ratioId[id]);
img.setSelected(false);
}
//重写Activity的一些方法
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
isRun = false;
finish();
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
finish();
super.onDestroy();
}
//自定义发送Toast的方法
private void toastInfo(String string){
Toast.makeText(TestUIActivity.this, string, Toast.LENGTH_SHORT).show();
}
}
我们来运行程序,看到如下界面,而且控制了这个流动视图自动滚动:
由于我们这设置了OnTouchListener(),所以当我们用手指在屏幕上滑动,图片发生改变:
这样,ViewFlipper的特性与功能就实现了。
读者如果有兴趣,可以从一下链接下载源代码:
http://download.youkuaiyun.com/detail/u010798277/5673135