Android ViewPager + Fragment实现滑动页面效果 Android ViewPager + Fragment实现滑动页面效果
浮云Cloud 人气:0效果：
PagerData类：
package com.cloud.viewpagerdemo;
import java.io.Serializable;
class PagerData implements Serializable {
private int mImageResId;
private String mContent;
PagerData(int imageResId, String content) {
mImageResId = imageResId;
mContent = content;
}
public int getImageResId() {
return mImageResId;
}
public void setImageResId(int imageResId) {
mImageResId = imageResId;
}
public String getContent() {
return mContent;
}
public void setContent(String content) {
mContent = content;
}
}
PagerFragment类：
package com.cloud.viewpagerdemo;
import android.graphics.Outline;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewOutlineProvider;
import android.widget.ImageView;
import android.widget.TextView;
public class PagerFragment extends Fragment {
private static final String ARG_DATA = "data";
private PagerData mData;
private ImageView mImageView;
private TextView mContent;
/**
* 通过静态方法获取Fragment实例，向Fragment传参数
* @param data 数据
* @return Fragment
*/
public static PagerFragment newInstance(PagerData data) {
PagerFragment fragment = new PagerFragment();
//使用FragmentArguments传递参数
Bundle args = new Bundle();
args.putSerializable(ARG_DATA, data);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mData = (PagerData) getArguments().getSerializable(ARG_DATA);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_pager, container, false);
//绑定控件
mImageView = view.findViewById(R.id.image_view);
mContent = view.findViewById(R.id.text_content);
//ImageView设置圆角
ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
outline.setRoundRect(0, 0, mImageView.getWidth(), mImageView.getHeight(), 16);
}
};
mImageView.setOutlineProvider(viewOutlineProvider);
mImageView.setClipToOutline(true);
mImageView.setImageResource(mData.getImageResId());
mContent.setText(mData.getContent());
return view;
}
}
PagerActivity:
package com.cloud.viewpagerdemo;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class PagerActivity extends AppCompatActivity {
private List<PagerData> mPagerData = new ArrayList<>();
private ViewPager mViewPager;
private TextView mTextPage;
private String page = "1 / 3";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pager);
initData();
FragmentManager fragmentManager = getSupportFragmentManager();
mViewPager = findViewById(R.id.view_pager);
mTextPage = findViewById(R.id.text_page);
//设置ViewPager适配器
mViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager) {
@Override
public Fragment getItem(int position) {
return PagerFragment.newInstance(mPagerData.get(position));
}
@Override
public int getCount() {
return mPagerData.size();
}
});
//监听页面改变
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
//页面选中
page = String.valueOf(position + 1) + " / " + String.valueOf(mPagerData.size());
mTextPage.setText(page);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
//设置缓存页数
mViewPager.setOffscreenPageLimit(3);
//设置默认页
mViewPager.setCurrentItem(0);
mTextPage.setText(page);
}
private void initData() {
//添加三项数据
mPagerData.add(new PagerData(R.drawable.img_0, "Photo by Adam Krowitz"));
mPagerData.add(new PagerData(R.drawable.img_1, "Photo by Samuel Ferrara"));
mPagerData.add(new PagerData(R.drawable.img_2, "Photo by Earth"));
}
}
fragment_pager：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="32dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:background="@drawable/pager_background"
android:elevation="4dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="@+id/image_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_margin="8dp"
android:layout_weight="1"
android:contentDescription="@null"
android:scaleType="centerCrop" />
<TextView
android:id="@+id/text_content"
android:layout_width="match_parent"
android:layout_height="125dp"
android:gravity="center"
android:padding="8dp"
android:textSize="18sp"
android:textColor="#000000"
tools:text="Content" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
activity_pager：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".PagerActivity">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@color/colorPrimary"
android:elevation="4dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="18sp"
android:textColor="#FFFFFF"
android:text="@string/app_name" />
</android.support.v7.widget.Toolbar>
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/toolbar">
</android.support.v4.view.ViewPager>
<TextView
android:id="@+id/text_page"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/toolbar"
tools:text="page" />
</android.support.constraint.ConstraintLayout>
总结
以上所述是小编给大家介绍的Android ViewPager + Fragment实现滑动页面效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
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