思路:
1.利用viewpager控件自帶的水平滾動特性,將想要展現的內容用xml佈局文件一張張寫出來
2.用一個linearlayout包裹張數個imageview,src是一個小圓點,另外準備一個大圓點,給imageview定義一個索引值
3.首先進入動畫時第一個原點是大的,進入第二張是將第一張的還原,第二章變大,這裏我是用style樣式setenabled方法來實現的
這個頁面在應用還在加載時調用,負責判斷是去引導頁面還是直接去主頁,如果首次進入或重新安裝了此應用都將去往引導頁面
<?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:background="#000000"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="等待加載中!!!!"
android:textColor="#f0f0f0"/>
</LinearLayout>
linearlayout裏面包裹着四個imageview,src裏面的dot是一個xml文件,下面會有給出
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_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_marginBottom="50dp"
android:layout_gravity="bottom|center_horizontal" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:src="@drawable/dot" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:src="@drawable/dot" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:src="@drawable/dot" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:src="@drawable/dot" />
</LinearLayout>
</FrameLayout>
將想要呈現的幻燈片以這樣的方式存儲,這是其中的一張,其他的這要把background改一下就行了
<?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:background="@drawable/img1">
</LinearLayout>
判斷是否是第一次加載進來的具體實現
public class SplashActivity extends Activity {
boolean isFirstIn = false;
private SharedPreferences preferences;
private static final int GO_HOME = 1000;
private static final int GO_GUIDE = 1001;
// 延遲3秒
private static final long SPLASH_DELAY_MILLIS = 3000;
private static final String SHAREDPREFERENCES_NAME = "first_pref";
/**
* Handler:跳轉到不同界面
*/
private boolean isInstalled(Context context, String packageName) {
boolean hasInstalled = false;
PackageManager pm = context.getPackageManager();
List<PackageInfo> list = pm
.getInstalledPackages(PackageManager.PERMISSION_GRANTED);
for (PackageInfo p : list) {
if (packageName != null && packageName.equals(p.packageName)) {
hasInstalled = true;
break;
}
}
return hasInstalled;
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case GO_HOME:
goHome();
break;
case GO_GUIDE:
goGuide();
break;
}
super.handleMessage(msg);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
init();
if (isInstalled(getApplicationContext(),
"com.example.viewpagerfragment")) {
isFirstIn = true;
}
// 判斷程序與第幾次運行,如果是第一次運行則跳轉到引導界面,否則跳轉到主界面
if (!isFirstIn) {
// 使用Handler的postDelayed方法,3秒後執行跳轉到MainActivity
mHandler.sendEmptyMessageDelayed(GO_HOME, SPLASH_DELAY_MILLIS);
} else {
mHandler.sendEmptyMessageDelayed(GO_GUIDE, SPLASH_DELAY_MILLIS);
}
}
private void init() {
// 讀取SharedPreferences中需要的數據
// 使用SharedPreferences來記錄程序的使用次數
preferences = getSharedPreferences(SHAREDPREFERENCES_NAME, MODE_PRIVATE);
// 取得相應的值,如果沒有該值,說明還未寫入,用true作爲默認值
isFirstIn = preferences.getBoolean("isFirstIn", true);
}
private void goHome() {
Intent intent = new Intent(SplashActivity.this, MainActivity.class);
SplashActivity.this.startActivity(intent);
SplashActivity.this.finish();
}
private void goGuide() {
Intent intent = new Intent(SplashActivity.this, GuideActivity.class);
SplashActivity.this.startActivity(intent);
SplashActivity.this.finish();
}
}
正式開始引導
public class GuideActivity extends Activity implements OnPageChangeListener{
private ViewPager vp;
private ViewPagerAdapter vpAdapter;
private List<View> views;
// 底部小點圖片
private ImageView[] dots;
// 記錄當前選中位置
private int currentIndex;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.guide);
// 初始化頁面
initViews();
// 初始化底部小點
initDots();
}
private void initViews() {
LayoutInflater inflater = LayoutInflater.from(this);
views = new ArrayList<View>();
// 初始化引導圖片列表
views.add(inflater.inflate(R.layout.first_guide, null));
views.add(inflater.inflate(R.layout.second_guide, null));
views.add(inflater.inflate(R.layout.third_guide, null));
views.add(inflater.inflate(R.layout.fouth_guide, null));
// 初始化Adapter
vpAdapter = new ViewPagerAdapter(views, this);
vp = (ViewPager) findViewById(R.id.viewpager);
vp.setAdapter(vpAdapter);
// 綁定回調
vp.setOnPageChangeListener(this);
}
private void initDots() {
LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
dots = new ImageView[views.size()];
// 循環取得小點圖片
for (int i = 0; i < views.size(); i++) {
dots[i] = (ImageView) ll.getChildAt(i);
dots[i].setEnabled(true);// 都設爲灰色
}
currentIndex = 0;
dots[currentIndex].setEnabled(false);// 設置爲白色,即選中狀態
}
private void setCurrentDot(int position) {
if (position < 0 || position > views.size() - 1
|| currentIndex == position) {
return;
}
dots[position].setEnabled(false);
dots[currentIndex].setEnabled(true);
currentIndex = position;
}
// 當滑動狀態改變時調用
@Override
public void onPageScrollStateChanged(int arg0) {
}
// 噹噹前頁面被滑動時調用
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
// 當新的頁面被選中時調用
@Override
public void onPageSelected(int arg0) {
// 設置底部小點選中狀態
setCurrentDot(arg0);
}
}
viewpager自定義適配器
public class ViewPagerAdapter extends PagerAdapter {
// 界面列表
private List<View> views;
private Activity activity;
private static final String SHAREDPREFERENCES_NAME = "first_pref";
public ViewPagerAdapter(List<View> views, Activity activity) {
this.views = views;
this.activity = activity;
}
// 銷燬arg1位置的界面
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView(views.get(arg1));
}
@Override
public void finishUpdate(View arg0) {
}
// 獲得當前界面數
@Override
public int getCount() {
if (views != null) {
return views.size();
}
return 0;
}
// 初始化arg1位置的界面
@Override
public Object instantiateItem(View arg0, int arg1) {
((ViewPager) arg0).addView(views.get(arg1), 0);
if (arg1 == views.size() - 1) {
Button mStartWeiboImageButton = (Button) arg0
.findViewById(R.id.btn_begin);
mStartWeiboImageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 設置已經引導
setGuided();
goHome();
}
});
}
return views.get(arg1);
}
private void goHome() {
// 跳轉
Intent intent = new Intent(activity, MainActivity.class);
activity.startActivity(intent);
activity.finish();
}
/**
*
* method desc:設置已經引導過了,下次啓動不用再次引導
*/
private void setGuided() {
SharedPreferences preferences = activity.getSharedPreferences(
SHAREDPREFERENCES_NAME, Context.MODE_PRIVATE);
Editor editor = preferences.edit();
// 存入數據
editor.putBoolean("isFirstIn", false);
// 提交修改
editor.commit();
}
// 判斷是否由對象生成界面
@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) {
}
}