应用引导界面实现

时间 2019-11-09

标签应用引导界面实现繁體版

原文原文链接

1，启动界面类SplashActivity.javajava

public class SplashActivity extends Activity {
boolean isFirstIn = false;android

    private static final int GO_HOME = 1000;
    private static final int GO_GUIDE = 1001;
    // 延迟3秒
    private static final long SPLASH_DELAY_MILLIS = 3000;ide

private static final String SHAREDPREFERENCES_NAME = "first_pref";布局

    /**
     * Handler:跳转到不一样界面
     */
    private Handler mHandler = new Handler() {post

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case GO_HOME:
                goHome();
                break;
            case GO_GUIDE:
                goGuide();
                break;
            }
            super.handleMessage(msg);
        }
    };ui

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.splash);this

init();
}rest

    private void init() {
        // 读取SharedPreferences中须要的数据
        // 使用SharedPreferences来记录程序的使用次数
        SharedPreferences preferences = getSharedPreferences(
                SHAREDPREFERENCES_NAME, MODE_PRIVATE);xml

// 取得相应的值，若是没有该值，说明还未写入，用true做为默认值
isFirstIn = preferences.getBoolean("isFirstIn", true);对象

        // 判断程序与第几回运行，若是是第一次运行则跳转到引导界面，不然跳转到主界面
        if (!isFirstIn) {
            // 使用Handler的postDelayed方法，3秒后执行跳转到MainActivity
            mHandler.sendEmptyMessageDelayed(GO_HOME, SPLASH_DELAY_MILLIS);
        } else {
            mHandler.sendEmptyMessageDelayed(GO_GUIDE, SPLASH_DELAY_MILLIS);
        }

}

    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();
    }
}

2，引导界面类GuideActivity.java

public class GuideActivity extends Activity implements OnPageChangeListener {

    private ViewPager vp;
    private ViewPagerAdapter vpAdapter;
    private List<View> views;

// 底部小点图片
private ImageView[] dots;

// 记录当前选中位置
private int currentIndex;

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

// 初始化页面
initViews();

        // 初始化底部小点
        initDots();
    }

private void initViews() {
LayoutInflater inflater = LayoutInflater.from(this);

        views = new ArrayList<View>();
        // 初始化引导图片列表
        views.add(inflater.inflate(R.layout.one_main, null));
        views.add(inflater.inflate(R.layout.two_main, null));
        views.add(inflater.inflate(R.layout.three_main, null));
        views.add(inflater.inflate(R.layout.four_main, null));

// 初始化Adapter
vpAdapter = new ViewPagerAdapter(views, this);

        vp = (ViewPager) findViewById(R.id.viewpager);
        vp.setAdapter(vpAdapter);
        // 绑定回调
        vp.setOnPageChangeListener(this);
    }

private void initDots() {
LinearLayout ll = (LinearLayout) findViewById(R.id.ll);

dots = new ImageView[views.size()];

        // 循环取得小点图片
        for (int i = 0; i < views.size(); i++) {
            dots[i] = (ImageView) ll.getChildAt(i);
            dots[i].setEnabled(true);// 下面小点，初始化全部项都使能状态        }

        currentIndex = 0;
        dots[currentIndex].setEnabled(false);//初始化第一项为非使能状态
    }

    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;
}

    // 当滑动状态改变时调用
    @Override
    public void onPageScrollStateChanged(int arg0) {
    }

    // 当当前页面被滑动时调用
    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
    }

    // 当新的页面被选中时调用
    @Override
    public void onPageSelected(int arg0) {
        // 设置底部小点选中状态
        setCurrentDot(arg0);
    }

}

3，适配器ViewPagerAdapter.java

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;
    }

    // 销毁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) {
    }

    // 得到当前界面数
    @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) {
            ImageView mStartWeiboImageButton = (ImageView) arg0
                    .findViewById(R.id.iv_start_weibo);
            mStartWeiboImageButton.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // 设置已经引导
                    setGuided();
                    goHome();

}

            });
        }
        return views.get(arg1);
    }

    private void goHome() {
        // 跳转
        Intent intent = new Intent(activity, MainActivity.class);
        activity.startActivity(intent);
        activity.finish();
    }

    /**
     *
     * method desc：设置已经引导过了，下次启动不用再次引导
     */
    private void setGuided() {
        SharedPreferences preferences = activity.getSharedPreferences(
                SHAREDPREFERENCES_NAME, Context.MODE_PRIVATE);
        Editor editor = preferences.edit();
        // 存入数据
        editor.putBoolean("isFirstIn", false);
        // 提交修改
        editor.commit();
    }

    // 判断是否由对象生成界面
    @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) {
    }

}

4. 本身要实现的启动应用类MainActivity.java

public class MainActivity extends Activity {

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

}

5.其中的布局文件

（1）splash.xml

</RelativeLayout>

（2）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:orientation="vertical" >

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

（3）one_main.xml，two_main.xml，three_main.xml（更换背景图片便可）

<?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" >

</RelativeLayout>

（4）four_main.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" >

</RelativeLayout>

（5）activity_main.xml

</RelativeLayout>

（6）drawable下的dot.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_enabled="true" android:drawable="@drawable/dot2" /> <item android:drawable="@drawable/dot1" /></selector>