Android ViewPager引导页（三）

标签：viewpager   android   

一：ViewPager和导航点的实现：

主布局为guide.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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_height="match_parent"
        android:layout_width="match_parent"
        android:background="#00000000"
        android:persistentDrawingCache="animation">
    </android.support.v4.view.ViewPager>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/ll"
        android:orientation="horizontal"
        android:gravity="center_horizontal"
        android:layout_alignParentBottom = "true">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/iv1"
            android:src="@drawable/login_point"
            />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/iv2"
            android:src="@drawable/login_point_selected"
            />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/iv3"
            android:src="@drawable/login_point_selected"
            />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/iv4"
            android:src="@drawable/login_point_selected"
            />

        </LinearLayout>

</RelativeLayout>

guide.java:

package com.banana.k08.viewpagerdemo1;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by bananagg on 2015-07-28.
 */
public class Guide extends ActionBarActivity implements ViewPager.OnPageChangeListener{
    private ViewPager vp;
    private ViewPagerAdapter vpAdapter;
    private List<View> views;
    private ImageView[] dots;
    private int[] ids={R.id.iv1,R.id.iv2,R.id.iv3,R.id.iv4};
    private Button start_btn;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.guide);
        initView();
        initDots();
    }

    private void initView() {
        LayoutInflater inflater = LayoutInflater.from(this);
        views = new ArrayList<View>();

        views.add(inflater.inflate(R.layout.one,null));   //添加图片
        views.add(inflater.inflate(R.layout.two,null));
        views.add(inflater.inflate(R.layout.three,null));
        views.add(inflater.inflate(R.layout.four,null));

        vpAdapter = new ViewPagerAdapter(views,this);
        vp = (ViewPager) findViewById(R.id.viewpager);
        vp.setAdapter(vpAdapter);
        start_btn = (Button) views.get(3).findViewById(R.id.start_btn);
        start_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity(new Intent(Guide.this,MainActivity.class));
                finish();
            }
        });

        vp.setOnPageChangeListener(this);              //回调函数,用于页面改变的监听

    }

    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 onPageScrolled(int i, float v, int i2) {

    }

    @Override
    public void onPageSelected(int arg0) {   //更改当前导航的颜色
        for (int i=0;i<ids.length;i++){
            if(arg0 == i){
                dots[i].setImageResource(R.drawable.login_point);
            }
            else{
                dots[i].setImageResource(R.drawable.login_point_selected);
            }
        }
    }

    @Override
    public void onPageScrollStateChanged(int i) {

    }
}

对于很多APP，只有在安装软件是才会有导航页，在第二次打开着软件时是不会继续加载导航页的，所以我们需要一个变量来控制这个页面的跳转，这儿采用SharedPreferences方式存储数据，用这个存储的数据来控制页面跳转的变量值。

package com.banana.k08.viewpagerdemo1;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


public class WelcomeAct extends ActionBarActivity {

    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(Message msg){
            switch (msg.what){
                case GO_GUIDE:
                    goGuide();
                    break;
                case GO_HOME:
                    goHome();
                    break;
            }
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome);
        init();
    }

    private void init(){
        SharedPreferences perPreferences = getSharedPreferences("jike",MODE_PRIVATE);    //MODE_PRIVATE表示该文件只能被自身应用调用
        isFirstIn = perPreferences.getBoolean("isFirstIn",true);   //

        System.out.println(isFirstIn);

        if(!isFirstIn){
            mHandler.sendEmptyMessageDelayed(GO_HOME,TIME);
        }
        else{
            mHandler.sendEmptyMessageDelayed(GO_GUIDE,TIME);
            SharedPreferences.Editor editor =  perPreferences.edit();    //取得编辑
            editor.putBoolean("isFirstIn",false);                        //提交数据
            editor.commit();                                             //已经解锁注册，所以更改数据时不会触发监听器
        }
    }

    private void goHome(){
        Intent i = new Intent(WelcomeAct.this,MainActivity.class);
        startActivity(i);
        finish();
    }

    private void goGuide(){
        Intent i = new Intent(WelcomeAct.this,Guide.class);
        startActivity(i);
        finish();
    }



}

Android ViewPager引导页（三）

标签：viewpager   android   

原文地址：http://blog.csdn.net/u010304217/article/details/47110427