Android之应用首度使用的欢迎界面实例
Android之应用首次使用的欢迎界面实例
关键代码如下:
package com.chinaideal.bkclient.tabmain; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.View; import android.view.ViewGroup; import android.view.ViewTreeObserver.OnPreDrawListener; import android.view.animation.TranslateAnimation; import android.widget.ImageView; import android.widget.ImageView.ScaleType; public class WelComeActivity extends Activity { // 首次使用程序的显示的欢迎图片 private int[] ids = { R.drawable.webcom_frist_image, R.drawable.webcom_two_image, R.drawable.webcom_three_image, R.drawable.niwodai_welcom }; SharedPreferences share; private List<View> guides = new ArrayList<View>(); private ViewPager pager; private ImageView curDot; // 位移量 private int offset; // 记录当前的位置 private int curPos = 0; Editor editor; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); share = getSharedPreferences("showWelcomm", Context.MODE_PRIVATE); editor = share.edit(); // 判断是否首次登录程序 if (share.contains("shownum")) { setContentView(R.layout.welcomniwo); int num = share.getInt("shownum", 0); editor.putInt("shownum", num++); editor.commit(); skipActivity(1); } else { editor.putInt("shownum", 1); editor.commit(); setContentView(R.layout.welcometabx); initView(); } } private void initView() { for (int i = 0; i < ids.length; i++) { ImageView iv = new ImageView(this); iv.setImageResource(ids[i]); ViewGroup.LayoutParams params = new ViewGroup.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); iv.setLayoutParams(params); iv.setScaleType(ScaleType.FIT_XY); guides.add(iv); } curDot = (ImageView) findViewById(R.id.cur_dot); curDot.getViewTreeObserver().addOnPreDrawListener( new OnPreDrawListener() { public boolean onPreDraw() { offset = curDot.getWidth(); return true; } }); WecommPagerAdapter adapter = new WecommPagerAdapter(guides); pager = (ViewPager) findViewById(R.id.showwelom_page); pager.setAdapter(adapter); pager.setOnPageChangeListener(new OnPageChangeListener() { public void onPageSelected(int arg0) { moveCursorTo(arg0); if (arg0 == ids.length - 1) {// 到最后一张了 skipActivity(2); } curPos = arg0; } public void onPageScrolled(int arg0, float arg1, int arg2) { } public void onPageScrollStateChanged(int arg0) { } }); } /** * 移动指针到相邻的位置 * * @param position * 指针的索引值 * */ private void moveCursorTo(int position) { TranslateAnimation anim = new TranslateAnimation(offset * curPos, offset * position, 0, 0); anim.setDuration(300); anim.setFillAfter(true); curDot.startAnimation(anim); } /** * 延迟多少秒进入主界面 * @param min 秒 */ private void skipActivity(int min) { new Handler().postDelayed(new Runnable() { @Override public void run() { Intent intent = new Intent(WelComeActivity.this, TabHostMain.class); startActivity(intent); WelComeActivity.this.finish(); } }, 1000*min); } }
public class WecommPagerAdapter extends PagerAdapter{ private List<View> views; public GuidePagerAdapter(List<View> views){ this.views=views; } @Override public void destroyItem(View arg0, int arg1, Object arg2) { ((ViewPager) arg0).removeView(views.get(arg1)); } @Override public void finishUpdate(View arg0) { } @Override public int getCount() { return views.size(); } @Override public Object instantiateItem(View arg0, int arg1) { ((ViewPager) arg0).addView(views.get(arg1), 0); return views.get(arg1); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == (arg1); } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View arg0) { } }
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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/showwelom_page" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center" android:flipInterval="30" android:persistentDrawingCache="animation" /> <FrameLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:gravity="center" android:paddingBottom="22.0dip"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1.0" android:src="@drawable/dot1_w" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1.0" android:src="@drawable/dot1_w" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1.0" android:src="@drawable/dot1_w" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1.0" android:src="@drawable/dot1_w" /> </LinearLayout> <ImageView android:id="@+id/cur_dot" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/dot2_w" /> </FrameLayout> </RelativeLayout>