本博客整理自极客学院Android ViewPager引导页。
1、创建承载ViewPager的类Guide.java
public class Guide extends Activity implements OnPageChangeListener{
private ViewPager vp;
private ViewPagerAdapter vpAdapter;
private List<View> views;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.guide);
initViews();
}
private void initViews() {
LayoutInflater inflater = LayoutInflater.from(this);
views = new ArrayList<View>();
views.add(inflater.inflate(R.layout.one, null));
views.add(inflater.inflate(R.layout.two, null));
views.add(inflater.inflate(R.layout.three, null));
vpAdapter = new ViewPagerAdapter(views, this);
vp = (ViewPager) findViewById(R.id.viewpager);
vp.setAdapter(vpAdapter);
}
}所需Adapter类：public class ViewPagerAdapter extends PagerAdapter {
private List<View> views;
private Context context;
public ViewPagerAdapter(List<View> views, Context context) {
this.views = views;
this.context = context;
}
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView(views.get(position));
}
@Override
public Object instantiateItem(View container, int position) {
((ViewPager) container).addView(views.get(position));
return views.get(position);
}
@Override
public int getCount() {
return views.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
}布局文件：
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
>
</android.support.v4.view.ViewPager>布局文件所需图片文件（one.xml，其它两个类似）：<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/guide_1"
android:contentDescription="@string/v1"/>
</LinearLayout>
通过以上步骤程序已基本可以运行。2、添加导航点
修改布局文件，添加导航点
<LinearLayout
android:id="@+id/ll"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center_horizontal"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/iv1"
android:src="@drawable/login_point_selected"
android:contentDescription="@string/v1"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/iv2"
android:src="@drawable/login_point"
android:contentDescription="@string/v2"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/iv3"
android:src="@drawable/login_point"
android:contentDescription="@string/v3"/>
</LinearLayout>在Guide类中添加对导航点的操作，并通过ViewPager中View改变导航点 private ImageView[] dots;
private int[] ids = {R.id.iv1, R.id.iv2, R.id.iv3};
private void initDots() {
dots = new ImageView[views.size()];
for (int i = 0; i < views.size(); i++) {
dots[i] = (ImageView) findViewById(ids[i]);
}
}
@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) {
for (int i = 0; i < ids.length; i++) {
if(arg0 == i) {
dots[i].setImageResource(R.drawable.login_point_selected);
}else{
dots[i].setImageResource(R.drawable.login_point);
}
}
}
vp.setOnPageChangeListener(this);//添加回调3、添加进入主界面按钮
在最后一个图片视图中添加按钮
<pre name="code" class="html"> <LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="horizontal"
android:layout_alignParentBottom="true">
<Button
android:id="@+id/start_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="进入"
/>
</LinearLayout>
并添加监听事件private Button startBtn;
startBtn = (Button) views.get(2).findViewById(R.id.start_btn);
startBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(Guide.this, MainActivity.class);
startActivity(i);
finish();
}
});4、添加欢迎界面，第一次进入引导页，非第一次进入主界面public class WelcomActivity extends Activity {
private boolean isFirstIn = false;
private static final int TIME = 2000;
private static final int GO_HOME = 1000;
private static final int GO_GUIDE = 1001;
private Handler mHandler = new Handler(){
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case GO_HOME:
goHome();
break;
case GO_GUIDE:
goGuide();
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
init();
}
private void init() {
SharedPreferences preferences = getSharedPreferences("jike", MODE_PRIVATE);
isFirstIn = preferences.getBoolean("isFirstIn", true);
if(!isFirstIn) {
mHandler.sendEmptyMessageDelayed(GO_HOME, TIME);
}else{
mHandler.sendEmptyMessageDelayed(GO_GUIDE, TIME);
Editor editor = preferences.edit();
editor.putBoolean("isFirstIn", false);
editor.commit();
}
}
private void goHome() {
Intent i = new Intent(WelcomActivity.this, MainActivity.class);
startActivity(i);
finish();
};
private void goGuide() {
Intent i = new Intent(WelcomActivity.this, Guide.class);
startActivity(i);
finish();
}
}源码下载
