androidviewpager与底部点

小开

viewPager.addOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {


switch (position) {
case 0:
img_page1.setImageResource(R.drawable.dot_selected);
img_page2.setImageResource(R.drawable.dot);
img_page3.setImageResource(R.drawable.dot);
img_page4.setImageResource(R.drawable.dot);
break;


case 1:
img_page1.setImageResource(R.drawable.dot);
img_page2.setImageResource(R.drawable.dot_selected);
img_page3.setImageResource(R.drawable.dot);
img_page4.setImageResource(R.drawable.dot);
break;


case 2:
img_page1.setImageResource(R.drawable.dot);
img_page2.setImageResource(R.drawable.dot);
img_page3.setImageResource(R.drawable.dot_selected);
img_page4.setImageResource(R.drawable.dot);
break;


case 3:
img_page1.setImageResource(R.drawable.dot);
img_page2.setImageResource(R.drawable.dot);
img_page3.setImageResource(R.drawable.dot);
img_page4.setImageResource(R.drawable.dot_selected);
break;


default:
break;
}




}


@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {


}


@Override
public void onPageScrollStateChanged(int arg0) {


}
});

小开

我的手工解决方案:

在布局中:

<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/dots"
/>

和在活动

private final static int NUM_PAGES = 5;
private ViewPager mViewPager;
private List<ImageView> dots;


@Override
protected void onCreate(Bundle savedInstanceState) {
// ...
addDots();
}


public void addDots() {
dots = new ArrayList<>();
LinearLayout dotsLayout = (LinearLayout)findViewById(R.id.dots);


for(int i = 0; i < NUM_PAGES; i++) {
ImageView dot = new ImageView(this);
dot.setImageDrawable(getResources().getDrawable(R.drawable.pager_dot_not_selected));


LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);
dotsLayout.addView(dot, params);


dots.add(dot);
}


mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}


@Override
public void onPageSelected(int position) {
selectDot(position);
}


@Override
public void onPageScrollStateChanged(int state) {
}
});
}


public void selectDot(int idx) {
Resources res = getResources();
for(int i = 0; i < NUM_PAGES; i++) {
int drawableId = (i==idx)?(R.drawable.pager_dot_selected):(R.drawable.pager_dot_not_selected);
Drawable drawable = res.getDrawable(drawableId);
dots.get(i).setImageDrawable(drawable);
}
}

小开

我创建了一个库来解决ViewPager中页面指示器的需求。我的库中包含一个名为DotIndicator的视图。要使用我的库，将compile 'com.matthew-tamlin:sliding-intro-screen:3.2.0'添加到您的gradle构建文件中。

视图可以通过添加以下内容添加到布局中:

    <com.matthewtamlin.sliding_intro_screen_library.indicators.DotIndicator
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:numberOfDots=YOUR_INT_HERE
app:selectedDotIndex=YOUR_INT_HERE/>

上面的代码完美地复制了谷歌启动器主屏幕上的点的功能，但是如果你想进一步自定义它，那么可以添加以下属性:

app:unselectedDotDiameter和app:selectedDotDiameter设置圆点的直径
app:unselectedDotColor和app:selectedDotColor设置圆点的颜色
app:spacingBetweenDots来改变点之间的距离
app:dotTransitionDuration设置动画从小到大(然后返回)的变化的时间

此外，视图可以通过以下方式创建:

DotIndicator indicator = new DotIndicator(context);

方法用于修改属性，类似于属性。要更新指示器以显示所选的不同页面，只需从ViewPager.OnPageChangeListener.onPageSelected(int)内部调用方法indicator.setSelectedItem(int, true)。

下面是一个使用它的例子:

如果你感兴趣的话，这个库实际上是为了制作上面gif中显示的介绍屏幕而设计的。

Github源代码可在这里:https://github.com/MatthewTamlin/SlidingIntroScreen

小开

我想针对上述问题发布一个更简单的解决方案，指标数字可以动态更改，只需更改一个变量值dotCounts=x，我所做的是这样的。

在可绘制文件夹中为页面选定指标创建一个名为“item_selectedquot;”的xml文件。

    <?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" android:useLevel="true"
android:dither="true">
<size android:height="8dp" android:width="8dp"/>
<solid android:color="@color/image_item_selected_for_dots"/>
</shape>

为未选中的指示器再创建一个名为“item_unselected”的xml文件。

    <?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" android:useLevel="true"
android:dither="true">
<size android:height="8dp" android:width="8dp"/>
<solid android:color="@color/image_item_unselected_for_dots"/>
</shape>

现在将这部分代码添加到你想要显示指示器的位置，例如在布局XML文件中的viewPager下面。

    <RelativeLayout
android:id="@+id/viewPagerIndicator"
android:layout_width="match_parent"
android:layout_below="@+id/banner_pager"
android:layout_height="wrap_content"
android:gravity="center">
    

<LinearLayout
android:id="@+id/viewPagerCountDots"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:gravity="center"
android:orientation="horizontal" />


</RelativeLayout>

将此函数添加到布局膨胀的活动文件或与上述xml文件相关的活动文件之上

    private int dotsCount = 5;    //No of tabs or images
private ImageView[] dots;
LinearLayout linearLayout;
    

private void drawPageSelectionIndicators(int mPosition){
if(linearLayout!=null) {
linearLayout.removeAllViews();
}
linearLayout=(LinearLayout)findViewById(R.id.viewPagerCountDots);
dots = new ImageView[dotsCount];
for (int i = 0; i < dotsCount; i++) {
dots[i] = new ImageView(context);
if(i==mPosition)
dots[i].setImageDrawable(getResources().getDrawable(R.drawable.item_selected));
else
dots[i].setImageDrawable(getResources().getDrawable(R.drawable.item_unselected));
    

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);
    

params.setMargins(4, 0, 4, 0);
linearLayout.addView(dots[i], params);
}
}

最后，在你的onCreate方法中添加以下代码来引用你的布局和处理页面选择的位置

    drawPageSelectionIndicators(0);
mPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
    

@Override
public void onPageSelected(int position) {
drawPageSelectionIndicators(position);
}
    

@Override
public void onPageScrollStateChanged(int state) {
}
});

小开

以下是我提出的解决方案。

实现了视图页面指示器(底部的点没有任何额外的库或插件)
在视图页面指示器(圆点)的触摸上，页面导航也在发生。
请不要忘记在资源中添加您自己的图片。
请随意评论和改进它。

A)下面是我的activity_main.xml

<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="schneider.carouseladventure.MainActivity">


<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/viewpager"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />


<RelativeLayout
android:id="@+id/viewPagerIndicator"
android:layout_width="match_parent"
android:layout_height="55dp"
android:layout_alignParentBottom="true"
android:layout_marginTop="5dp"
android:gravity="center">


<LinearLayout
android:id="@+id/viewPagerCountDots"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:gravity="center"
android:orientation="horizontal" />


</RelativeLayout>




</RelativeLayout>

B) pager_item.xml

<?xml version="1.0" encoding="utf-8"?>


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">


<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/imageView" />
</LinearLayout>

C) MainActivity.java

import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;


public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener, View.OnClickListener {


int[] mResources = {R.drawable.nature1, R.drawable.nature2, R.drawable.nature3, R.drawable.nature4,
R.drawable.nature5, R.drawable.nature6
};


ViewPager mViewPager;
private CustomPagerAdapter mAdapter;
private LinearLayout pager_indicator;
private int dotsCount;
private ImageView[] dots;




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


mViewPager = (ViewPager) findViewById(R.id.viewpager);
pager_indicator = (LinearLayout) findViewById(R.id.viewPagerCountDots);
mAdapter = new CustomPagerAdapter(this, mResources);
mViewPager.setAdapter(mAdapter);
mViewPager.setCurrentItem(0);
mViewPager.setOnPageChangeListener(this);


setPageViewIndicator();


}


private void setPageViewIndicator() {


Log.d("###setPageViewIndicator", " : called");
dotsCount = mAdapter.getCount();
dots = new ImageView[dotsCount];


for (int i = 0; i < dotsCount; i++) {
dots[i] = new ImageView(this);
dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));


LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);


params.setMargins(4, 0, 4, 0);


final int presentPosition = i;
dots[presentPosition].setOnTouchListener(new View.OnTouchListener() {


@Override
public boolean onTouch(View v, MotionEvent event) {
mViewPager.setCurrentItem(presentPosition);
return true;
}


});




pager_indicator.addView(dots[i], params);
}


dots[0].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
}


@Override
public void onClick(View v) {


}


@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {


}


@Override
public void onPageSelected(int position) {


Log.d("###onPageSelected, pos ", String.valueOf(position));
for (int i = 0; i < dotsCount; i++) {
dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));
}


dots[position].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));


if (position + 1 == dotsCount) {


} else {


}
}


@Override
public void onPageScrollStateChanged(int state) {


}
}

D) CustomPagerAdapter.java

 import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;


public class CustomPagerAdapter extends PagerAdapter {
private Context mContext;
LayoutInflater mLayoutInflater;
private int[] mResources;


public CustomPagerAdapter(Context context, int[] resources) {
mContext = context;
mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mResources = resources;
}


@Override
public Object instantiateItem(ViewGroup container, int position) {


View itemView = mLayoutInflater.inflate(R.layout.pager_item,container,false);
ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);
imageView.setImageResource(mResources[position]);
/* LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(950, 950);
imageView.setLayoutParams(layoutParams);*/
container.addView(itemView);
return itemView;
}


@Override
public void destroyItem(ViewGroup collection, int position, Object view) {
collection.removeView((View) view);
}


@Override
public int getCount() {
return mResources.length;
}


@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}

E) selecteditem_dot.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" android:useLevel="true"
android:dither="true">


<size android:height="12dip" android:width="12dip"/>


<solid android:color="#7e7e7e"/>
</shape>

F) nonselecteditem_dot.xml

 <?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval" android:useLevel="true"
android:dither="true">
<size android:height="12dip" android:width="12dip"/>
<solid android:color="#d3d3d3"/>
</shape>

小开

ViewPagerIndicator自2012年以来没有更新，并得到了几个从未修复的错误。

我终于找到了这个光库的替代品，为viewpager显示漂亮的点，这里是链接:

https://github.com/ongakuer/CircleIndicator

易于实施!

小开

最佳答案

不需要那么多代码。

你可以通过使用viewpager和tablayout来完成所有这些事情，而不需要编写这么多代码。

你的主要布局:

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">


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


</android.support.v4.view.ViewPager>
<android.support.design.widget.TabLayout
android:id="@+id/tabDots"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="@drawable/tab_selector"
app:tabGravity="center"
app:tabIndicatorHeight="0dp"/>
</RelativeLayout>

将你的UI元素按如下方式连接起来:

Java代码: < br >

mImageViewPager = (ViewPager) findViewById(R.id.pager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabDots);
tabLayout.setupWithViewPager(mImageViewPager, true);

就这样，你可以开始了。

您需要在可拉的文件夹中创建以下xml资源文件。

tab_indicator_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
android:innerRadius="0dp"
android:shape="ring"
android:thickness="4dp"
android:useLevel="false"
xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@color/colorAccent"/>
</shape>

tab_indicator_default.xml < br >

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="0dp"
android:shape="oval"
android:thickness="2dp"
android:useLevel="false">
<solid android:color="@android:color/darker_gray"/>
</shape>

tab_selector.xml

 <?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">


<item android:drawable="@drawable/tab_indicator_selected"
android:state_selected="true"/>


<item android:drawable="@drawable/tab_indicator_default"/>
</selector>

感觉和我一样懒惰?好了，上面所有的代码都转换成一个库! 使用在gradle中添加以下内容: implementation 'com.chabbal:slidingdotsplash:1.0.2' 将以下内容添加到您的活动或片段布局中

<com.chabbal.slidingdotsplash.SlidingSplashView
android:id="@+id/splash"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:imageResources="@array/img_id_arr"/>

在strings.xml中创建一个整数数组，例如:

<integer-array name="img_id_arr">
<item>@drawable/img1</item>
<item>@drawable/img2</item>
<item>@drawable/img3</item>
<item>@drawable/img4</item>
</integer-array>

< em >完成了! 额外的为了监听页面更改使用addOnPageChangeListener(listener); Github 链接 . < / p >

小开

下面是我如何做到这一点，有点类似于上面的解决方案。只要确保你调用loadDots ()方法下载完所有图像后。

    private int dotsCount;
private TextView dotsTextView[];


private void setupAdapter() {
adapter = new SomeAdapter(getContext(), images);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(0);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
}


private final ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}


@Override
public void onPageSelected(int position) {
for (int i = 0; i < dotsCount; i++)
dotsTextView[i].setTextColor(Color.GRAY);


dotsTextView[position].setTextColor(Color.WHITE);
}


@Override
public void onPageScrollStateChanged(int state) {}
};


protected void loadDots() {
dotsCount = adapter.getCount();
dotsTextView = new TextView[dotsCount];
for (int i = 0; i < dotsCount; i++) {
dotsTextView[i] = new TextView(getContext());
dotsTextView[i].setText(R.string.dot);
dotsTextView[i].setTextSize(45);
dotsTextView[i].setTypeface(null, Typeface.BOLD);
dotsTextView[i].setTextColor(android.graphics.Color.GRAY);
mDotsLayout.addView(dotsTextView[i]);
}
dotsTextView[0].setTextColor(Color.WHITE);
}


XML


<?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="wrap_content">


<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="180dp"
android:background="#00000000"/>




<ImageView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/introImageView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>


<LinearLayout
android:id="@+id/image_count"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00000000"
android:gravity="center|bottom"
android:orientation="horizontal"/>
</FrameLayout>

小开

如果有人想构建一个带有缩略图作为指示器的viewPager，可以选择使用这个库: ThumbIndicator用于viewPager，它也可以将图像链接作为资源

小开

@Junaid提供的解决方案可以简化。而不是创建一个选择器(tab_selector.xml)，你可以直接在TabLayout上设置可绘制对象
<com.google.android.material.tabs.TabLayout android:id="@+id/tabLayout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" app:tabBackground="@drawable/tab_indicator_default" app:tabIndicator="@drawable/tab_indicator_selected" app:tabIndicatorColor="<youColor>" app:tabIndicatorGravity="center" app:tabIndicatorHeight="8dp" />

app:tabIndicatorHeight被设置为与tab_indicator_selected.xml相同的值。遵循此方法，您将保留TabLayout的默认动画。通过编程，您必须将选项卡设置为所选:

object : ViewPager2.OnPageChangeCallback() { override fun onPageSelected(position: Int) { val tab = binding.tabLayout.getTabAt(position) binding.tabLayout.selectTab(tab, true) } }

请注意，我使用了ViewPager2。应该有使用ViewPager的等效方法。