android实现欢迎界面效果
现在许多流行的软件中都有欢迎界面,今天就介绍一下欢迎界面的制作,由于界面涉及到页面的滑动,因此要采用ViewPager,sdk在4.0一下的都要引入“android-support-v4.jar”这个包。
第一步:main.xml设计,其中ViewPager为多页显示控件,其中button是为了在最后一页显示开始按钮,其中android:visibility="invisible"是保证在其他页面不显示button,只有在最后一页才显示button,下面的linearlayout里的image是圆点展示当前页状态和总页数:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <android.support.v4.view.ViewPager android:id="@+id/guide_viewpager" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" > </android.support.v4.view.ViewPager> <Button android:text="开始体验" android:id="@+id/startButton" android:layout_marginBottom="50dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|center_horizontal" android:visibility="invisible"> </Button> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" android:layout_marginBottom="30dp" android:gravity="center_horizontal" > <ImageView android:id="@+id/page0" android:layout_width="wrap_content" android:layout_height="wrap_content" android:scaleType="matrix" android:src="@drawable/page_now" /> <ImageView android:id="@+id/page1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:scaleType="matrix" android:src="@drawable/page" /> <ImageView android:id="@+id/page2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:scaleType="matrix" android:src="@drawable/page" /> </LinearLayout> </FrameLayout>
第二步:创建MyPagerAdapter 继承PagerAdapter这个适配器比较简单,如下:
package com.crtk.adapter; import java.util.ArrayList; import android.R; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; import android.widget.Button; import android.widget.ImageView; public class PageviewAdapter extends PagerAdapter{ private ArrayList<View> views; public PageviewAdapter(ArrayList<View> views){ this.views = views; } //页面view public Object instantiateItem(View container, int position) { ((ViewPager)container).addView(views.get(position)); return views.get(position); } @Override public int getCount() { return this.views.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } public void destroyItem(View container, int position, Object object) { ((ViewPager)container).removeView(views.get(position)); } @Override public void finishUpdate(View arg0) { // TODO Auto-generated method stub } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { // TODO Auto-generated method stub } @Override public Parcelable saveState() { // TODO Auto-generated method stub return null; } @Override public void startUpdate(View arg0) { // TODO Auto-generated method stub } }
第三步:写Activity,如下:
package com.crtk.main; import java.util.ArrayList; import java.util.List; import com.crtk.adapter.PageviewAdapter; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class GuideActivity extends Activity implements OnPageChangeListener{ static final int PAGE_NUM = 3;//欢迎界面共3页 private ArrayList<View> views;//保存viewpager的各个view private ViewPager viewPager; private LayoutInflater inflater; private ImageView []dots; //小点数组 private Intent intent ; private Button startButton; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.guide); inflater = LayoutInflater.from(this); intent = new Intent(GuideActivity.this, MainActivity.class); //初始化page initPage(); //初始化小点。。。 initDots(); } private void initPage(){ views = new ArrayList<View>(); //guide_01,guide_02,guide_03 为3个欢迎页面,将其加入views数组中 views.add(inflater.inflate(R.layout.guide_01, null)); views.add(inflater.inflate(R.layout.guide_02, null)); views.add(inflater.inflate(R.layout.guide_03, null)); PageviewAdapter pageAdapter = new PageviewAdapter(views); viewPager = (ViewPager)findViewById(R.id.guide_viewpager); //绑定adapter viewPager.setAdapter(pageAdapter); //重要!!!绑定pageseleted等函数 viewPager.setOnPageChangeListener(this); //绑定开始键,开始使用,只有在最后一页button才能显示 startButton = (Button)findViewById(R.id.startButton); startButton.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { // TODO Auto-generated method stub GuideActivity.this.startActivity(intent); //跳转activity GuideActivity.this.finish(); } }); } private void initDots(){ dots = new ImageView[3];//底部小圆点数组 //View guidePage = (View)findViewById(); dots[0] = (ImageView) findViewById(R.id.page0); dots[1] = (ImageView) findViewById(R.id.page1); dots[2] = (ImageView) findViewById(R.id.page2); } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } @Override public void onPageSelected(int arg0) { // TODO Auto-generated method stub System.out.println("the page now is " + arg0); dots[arg0].setImageDrawable(getResources().getDrawable(R.drawable.page_now)); //选中的页面设置小圆点为亮点,其余的都为暗点 for (int i = 0; i < 3 ;i ++) { if (i == arg0) {continue;} else { dots[i].setImageDrawable(getResources().getDrawable(R.drawable.page)); } } //如果切换到最后一页,显示开始button,其余的都隐藏 if(arg0 == PAGE_NUM -1) { startButton.setVisibility(View.VISIBLE);//.setVisibility(); } } }
其他:上述只是简单实现了欢迎界面,有的blog里建议最后一页的开始button放在viewpager里,本人试了一下不是太好用,如果功能要求不是特别多,上述做法还是挺简单的。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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