android实现欢迎界面效果 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：

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 views; public PageviewAdapter(ArrayList 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 stubreturn 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 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. */@Overridepublic 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pageinitPage(); //初始化小点。。。initDots(); }private void initPage(){views = new ArrayList(); //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(newOnClickListener(){ @Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubGuideActivity.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 stubSystem.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。
【android实现欢迎界面效果】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脚本之家。