一、實現的思路
當歡迎頁面加載完成的時候(一般爲動畫),即歡迎頁面動畫加載完成的時候,從本地存儲中取出記錄是否是第一次進入,然後進入引導頁或者主頁,如果是第一次就進入引導頁,否則進入主頁。
引導頁佈局使用:viewPager實現,可根據需要添加“開始體驗”,“跳過”按鈕等,佈局中下位置可使用imgae設置其drawable的shape爲oval,作爲引導頁面的指示器點,根據頁面的多少實現動態添加,當然也可根據需求實現引導頁面的自由滾動。
二、以下是頁面佈局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_guide"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.atguigu.beijingnews.activity.GuideActivity">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<Button
android:id="@+id/btn_start_main"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="80dp"
android:background="@drawable/btn_start_main_bg_selector"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:text="開始體驗"
android:textColor="@drawable/btn_start_main_textcolor_selector"
android:textSize="20sp"
android:visibility="gone" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="40dp">
<LinearLayout
android:id="@+id/ll_point_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" />
<ImageView
android:id="@+id/iv_red_point"
android:layout_width="10dp"
android:layout_height="10dp"
android:src="@drawable/red_point" />
</RelativeLayout>
</RelativeLayout>
三、引導頁面指示點的shape:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<corners android:radius="5dp" />
<solid android:color="@android:color/holo_red_light" />
</shape>
四、歡迎頁面代碼:
//當動畫播放結束的時候回調
@Override
public void onAnimationEnd(Animation animation) {
//當動畫播放完成進入--主頁面或者引導頁面
boolean startMain = CacheUtils.getBoolean(WelcomeActivity.this, GuideActivity.START_MAIN);
if (startMain) {
startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
} else {
startActivity(new Intent(WelcomeActivity.this, GuideActivity.class));
}
finish();
}
五、引導頁代碼:
package com.atguigu.beijingnews.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import com.atguigu.beijingnews.MainActivity;
import com.atguigu.beijingnews.R;
import com.atguigu.beijingnews.utils.CacheUtils;
import com.atguigu.beijingnews.utils.DensityUtil;
import com.atguigu.beijingnews.utils.LogUtil;
import java.util.ArrayList;
public class GuideActivity extends Activity {
public static final String START_MAIN = "start_main";
private ViewPager viewpager;
private LinearLayout ll_point_group;
private ImageView iv_red_point;
private Button btn_start_main;
private ArrayList<ImageView> imageViews;
/**
* 兩點間的間距
*/
private int leftMarg;
private int widthDpi;
/**
* 設置適配器--> 準備數據
*/
private int ids[] = new int[]{
R.drawable.guide_1, R.drawable.guide_2, R.drawable.guide_3
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_guide);
viewpager = (ViewPager) findViewById(R.id.viewpager);
ll_point_group = (LinearLayout) findViewById(R.id.ll_point_group);
iv_red_point = (ImageView) findViewById(R.id.iv_red_point);
btn_start_main = (Button) findViewById(R.id.btn_start_main);
initData();
}
/**
* 初始化引導頁的數據
*/
private void initData() {
widthDpi = DensityUtil.dip2px(this, 10);
LogUtil.e(widthDpi + "-----------------");
imageViews = new ArrayList<>();
for (int i = 0; i < ids.length; i++) {
ImageView imageView = new ImageView(this);
imageView.setBackgroundResource(ids[i]);
//把圖片添加到集合中
imageViews.add(imageView);
//添加灰色的點
ImageView point = new ImageView(this);
point.setImageResource(R.drawable.point_gray);
//設置點的大小
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(widthDpi, widthDpi);
if (i != 0) {
//設置間距
params.leftMargin = widthDpi;
}
point.setLayoutParams(params);
ll_point_group.addView(point);
}
//設置適配器
viewpager.setAdapter(new MyPagerAdapter());
/**
* 求間距
* 構造方法--> 測量(measure--onMeasure)--> layout-->onLayout-->draw-->onDraw
*/
iv_red_point.getViewTreeObserver().addOnGlobalLayoutListener(new MyOnGlobalLayoutListener());
//監聽viewPager頁面滑動的百分比
viewpager.addOnPageChangeListener(new MyOnPageChangeListener());
//設置點擊事件
btn_start_main.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//記錄進入引導頁面
CacheUtils.putBoolean(GuideActivity.this, START_MAIN, true);
//跳轉到主頁面
startActivity(new Intent(GuideActivity.this, MainActivity.class));
finish();//關閉引導頁面
}
});
}
class MyOnPageChangeListener implements ViewPager.OnPageChangeListener {
/**
* @param position 當前滑動頁面的下標位置
* @param positionOffset 滑動了頁面的百分比
* @param positionOffsetPixels 滑動了頁面多少像數
*/
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
//紅點移動的距離 = ViewPager頁面的百分比* 間距
// float leftMargin = positionOffset * leftMarg;
//座標 = 起始位置 + 紅點移動的距離;
float leftMargin = (position + positionOffset) * leftMarg;
RelativeLayout.LayoutParams paramgs = (RelativeLayout.LayoutParams) iv_red_point.getLayoutParams();
//距離左邊的距離
paramgs.leftMargin = (int) leftMargin;
iv_red_point.setLayoutParams(paramgs);
LogUtil.e("position==" + position + ",positionOffset==" + positionOffset + ",positionOffsetPixels==" + positionOffsetPixels);
}
@Override
public void onPageSelected(int position) {
if (position == imageViews.size() - 1) {//滑動到最後一個頁面顯示按鈕
//讓按鈕顯示
btn_start_main.setVisibility(View.VISIBLE);
} else {
//按鈕隱藏
btn_start_main.setVisibility(View.GONE);
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
}
class MyOnGlobalLayoutListener implements ViewTreeObserver.OnGlobalLayoutListener {
@Override
public void onGlobalLayout() {
iv_red_point.getViewTreeObserver().removeGlobalOnLayoutListener(this);
//間距 = 第一個點距離左邊距離 - 第0個點距離左邊距離
leftMarg = ll_point_group.getChildAt(1).getLeft() - ll_point_group.getChildAt(0).getLeft();
}
}
class MyPagerAdapter extends PagerAdapter {
@Override
public int getCount() {
return imageViews.size();
}
/**
* @param container viewPager容器
* @param position 創建視圖對應的位置
* @return
*/
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView = imageViews.get(position);
container.addView(imageView);
return imageView;
}
/**
* @param view
* @param object
* @return
*/
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
}
好了,今天的分享就到這裏,大家有什麼問題,歡迎與我交流。