Android在国内这般火,这就试试水。。。不多说,直接上实践结果,根据前辈经验,首先看:AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.joyce" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="16" /> <application android:allowBackup="true" android:icon="@drawable/ic_program" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" > <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="fill_parent" android:layout_height="fill_parent"/> <LinearLayout android:id="@+id/ll" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="20dip" android:orientation="horizontal"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:clickable="true" android:padding="15dip" android:src="@drawable/point" android:contentDescription="@string/pic_title"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:clickable="true" android:padding="15dip" android:src="@drawable/point" android:contentDescription="@string/pic_title"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:clickable="true" android:padding="15dip" android:src="@drawable/point" android:contentDescription="@string/pic_title"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:clickable="true" android:padding="15dip" android:src="@drawable/point" android:contentDescription="@string/pic_title"/> </LinearLayout> </RelativeLayout>
package com.joyce; import java.util.List; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.View; public class ViewPagerAdapter extends PagerAdapter { //界面列表 private List<View> views; public ViewPagerAdapter(List<View> views) { this.views = views; } /* * 获取界面数 * (non-Javadoc) * @see android.support.v4.view.PagerAdapter#getCount() */ @Override public int getCount() { return views == null ? 0 : views.size(); } /* * 判断是否由对象生成界面 * (non-Javadoc) * @see android.support.v4.view.PagerAdapter#isViewFromObject(android.view.View, java.lang.Object) */ @Override public boolean isViewFromObject(View v, Object o) { return v == o; } /* * 初始化position位置的界面 * (non-Javadoc) * @see android.support.v4.view.PagerAdapter#instantiateItem(android.view.View, int) */ @Override public Object instantiateItem(View view, int position) { ViewPager viewpage = (ViewPager) view; viewpage.addView(views.get(position), 0); return views.get(position); } /* * 销毁position位置的界面 * (non-Javadoc) * @see android.support.v4.view.PagerAdapter#destroyItem(android.view.View, int, java.lang.Object) */ @Override public void destroyItem(View view, int position, Object object) { ((ViewPager)view).removeView(views.get(position)); } }
package com.joyce; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.app.AlertDialog.Builder; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.ImageView; import android.widget.ImageView.ScaleType; import android.widget.LinearLayout; import android.widget.LinearLayout.LayoutParams; public class MainActivity extends Activity { //定义ViewPager对象 private ViewPager viewPager; //定义ViewPager适配器 private ViewPagerAdapter vpAdapter; //定义一个ArrayList来存放View private List<View> views; //引导图片资源 private static final int[] pics = {R.drawable.pic1,R.drawable.pic2,R.drawable.pic3,R.drawable.pic4}; //底部小点的图片 private ImageView[] points; //记录当前选中位置 private int currentIndex; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initData(); } /** * 初始化组件 */ private void initView(){ // 实例化对象 views = new ArrayList<View>(); viewPager = (ViewPager) this.findViewById(R.id.viewpager); vpAdapter = new ViewPagerAdapter(views); } /** * 初始化数据 */ private void initData(){ LayoutParams mParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); for (int i = 0; i < pics.length; i++) { ImageView iv = new ImageView(this); iv.setScaleType(ScaleType.FIT_XY); iv.setLayoutParams(mParams); iv.setImageResource(pics[i]); views.add(iv); } // 设置数据 viewPager.setAdapter(vpAdapter); viewPager.setOnPageChangeListener(new OnPageChangeListener() { /** * 当新的页面被选中时调用 * (non-Javadoc) * @see android.support.v4.view.ViewPager.OnPageChangeListener#onPageSelected(int) */ @Override public void onPageSelected(int position) { //设置底部小点选中状态 setCurDot(position); } /** * 当当前页面被滑动时调用 */ @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } /** * 当滑动状态改变时调用 */ @Override public void onPageScrollStateChanged(int arg0) { } }); initPoint(); } /** * 初始化底部小点 */ private void initPoint(){ LinearLayout linearLayout = (LinearLayout) this.findViewById(R.id.ll); points = new ImageView[pics.length]; //循环取得小点图片 for (int i = 0; i < pics.length; i++) { //得到一个LinearLayout下面的每一个子元素 points[i] = (ImageView) linearLayout.getChildAt(i); //默认都设为灰色 points[i].setEnabled(true); //给每个小点设置监听 points[i].setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { int position = (Integer)v.getTag(); setCurView(position); setCurDot(position); } }); //设置位置tag,方便取出与当前位置对应 points[i].setTag(i); } //设置当面默认的位置 currentIndex = 0; //设置为白色,即选中状态 points[currentIndex].setEnabled(false); } /** * 设置当前页面的位置 */ private void setCurView(int position){ if (position < 0 || position >= pics.length) { return; } viewPager.setCurrentItem(position); } /** * 设置当前的小点的位置 */ private void setCurDot(int positon){ if (positon < 0 || positon > pics.length - 1 || currentIndex == positon) { return; } points[positon].setEnabled(false); points[currentIndex].setEnabled(true); currentIndex = positon; } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } /** * 当菜单被选择点击时触发事件 */ @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); switch (id) { case R.id.about_we: new Builder(this) .setTitle(R.string.about_we) .setMessage("我的第一个Android程序,By Joyce!") .setPositiveButton("确定", null) .show(); break; default: // 没有自定义处理的事件,交给父类处理 return super.onOptionsItemSelected(item); } //返回true表示处理完菜单项的事件,不需要将该事件继续传播下去了 return true; } }
原文:http://blog.csdn.net/luo201227/article/details/44650643