重影效果：两个视图相互叠加。为什么？
我希望能够点击按钮来向前和向后浏览多个视图，以及在视图之间向左或向右滑动。
所以我决定实现ViewPager在多个视图之间滑动。
这是我的代码：
layout xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/white"
>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewPager"/>
<ImageView
android:id="@+id/apple"
android:layout_width="200sp"
android:layout_height="150sp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/apple"
android:contentDescription="apple"/>
<TextView
android:id="@+id/number"
android:layout_width="100sp"
android:layout_height="55sp"
android:layout_marginTop="47dp"
android:layout_below="@+id/apple" android:layout_alignStart="@+id/apple"/>
<Button
android:id="@+id/save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/save"
android:layout_alignTop="@+id/ignore" android:layout_toStartOf="@+id/apple"/>
<Button
android:id="@+id/ignore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Ignore"
android:layout_alignParentBottom="true" android:layout_toEndOf="@+id/apple"/>
<ImageView
android:id="@+id/back_nav_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_action_back"
android:contentDescription="back">
</ImageView>
<ImageView
android:id="@+id/forward_nav_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_action_forward"
android:layout_alignParentTop="true" android:layout_alignParentEnd="true"
android:contentDescription="forward">
</ImageView>
</RelativeLayout>
这是我的活动：
public class CollectionPager extends Activity {
private PagerAdapter pagerAdapter;
ActionBar actionbar;
MyAdapter myAdapter;
private Context context;
private TextView textView;
private int currentPage;
ViewPager viewPager;
int progressChanged = 0;
public static final String TAG = "CollectionPager";
public CollectionPager() {
context = this;
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.collection);
viewPager = (ViewPager) findViewById(R.id.viewPager);
myAdapter = new MyAdapter();
viewPager.setAdapter(myAdapter);
ActionBar actionBar = getActionBar();
if (actionBar != null) {
actionBar.hide();
}
//Initialize the back button and add an onClick event listener to the button
final ImageView back_button = (ImageView) findViewById(R.id.back_nav_arrow);
back_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//it doesn't matter if you're already in the first item
viewPager.setCurrentItem(viewPager.getCurrentItem() - 1);
}
});
//Initialize the forward button and add an onClick event listener to the button
final ImageView forward_button = (ImageView) findViewById(R.id.forward_nav_arrow);
forward_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//it doesn't matter if you're already in the last item
viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);
}
});
final Button save_button = (Button) findViewById(R.id.save);
save_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//save
}
});
final Button ignore_button = (Button) findViewById(R.id.ignore);
ignore_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//ignore
}
});
//Attach the page change listener inside the activity
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
// This method will be invoked when the current page is scrolled
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
//This method will be invoked when a new page becomes selected
@Override
public void onPageSelected(int position) {
//get position
currentPage = position;
}
// Called when the scroll state changes:
// SCROLL_STATE_IDLE, SCROLL_STATE_DRAGGING, SCROLL_STATE_SETTLING
@Override
public void onPageScrollStateChanged(int i) {
//get state
}
});
}
private class MyAdapter extends PagerAdapter {
int NumberOfPages = 10;
LayoutInflater inflater = (LayoutInflater) CollectionPager.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
@Override
public int getCount() {
return NumberOfPages;
}
@Override
public Object instantiateItem(ViewGroup parent, int position) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.collection, parent, false);
ImageView imageView = (ImageView) view
.findViewById(R.id.apple);
imageView.setImageResource(R.drawable.apple);
parent.addView(view,0);
return view;
}
@Override
public void destroyItem(ViewGroup parent, int position, Object object) {
((ViewPager) parent).removeView((View) object);
}
@Override
public boolean isViewFromObject(View parent, Object object) {
return parent== ((View) object);
}
@Override
public Parcelable saveState() {
return null;
}
}
}
检测到onClickEvent但是这里是关于视图发生了什么的屏幕截图。两个视图在彼此的顶部。一个视图固定在屏幕上，另一个视图正确滚动。
我不确定为什么会这样。在我的代码中导致这种情况的原因是什么？
编辑：以下是突出显示问题的视频：https://www.dropbox.com/s/6x5qa16xyttzrwa/VIDEO0041.mp4?dl=0
1 个答案:
答案 0 :(得分：1)
更改
@Override
public boolean isViewFromObject(View parent, Object object) {
return parent== ((View) object);
}
到
@Override
public boolean isViewFromObject(View v, Object o) {
return parent == object;
}
更新
看完你的电影之后你的问题是你在viewpager的顶部放了一些静态wedget，所以删除它，这意味着你的布局会变成这样：
这是您的main_activity.xml，您必须按功能activity
setContentView
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/white"
>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewPager"/>
</RelativeLayout>
然后在instantiateItem使用以下布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/white"
>
<ImageView
android:id="@+id/apple"
android:layout_width="200sp"
android:layout_height="150sp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/apple"
android:contentDescription="apple"/>
<TextView
android:id="@+id/number"
android:layout_width="100sp"
android:layout_height="55sp"
android:layout_marginTop="47dp"
android:layout_below="@+id/apple" android:layout_alignStart="@+id/apple"/>
<Button
android:id="@+id/save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/save"
android:layout_alignTop="@+id/ignore" android:layout_toStartOf="@+id/apple"/>
<Button
android:id="@+id/ignore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Ignore"
android:layout_alignParentBottom="true" android:layout_toEndOf="@+id/apple"/>
<ImageView
android:id="@+id/back_nav_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_action_back"
android:contentDescription="back">
</ImageView>
<ImageView
android:id="@+id/forward_nav_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_action_forward"
android:layout_alignParentTop="true" android:layout_alignParentEnd="true"
android:contentDescription="forward">
</ImageView>
您的主要活动：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.collection);
viewPager = (ViewPager) findViewById(R.id.viewPager);
myAdapter = new MyAdapter();
viewPager.setAdapter(myAdapter);
ActionBar actionBar = getActionBar();
if (actionBar != null) {
actionBar.hide();
}
//Attach the page change listener inside the activity
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
// This method will be invoked when the current page is scrolled
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
//This method will be invoked when a new page becomes selected
@Override
public void onPageSelected(int position) {
//get position
currentPage = position;
}
// Called when the scroll state changes:
// SCROLL_STATE_IDLE, SCROLL_STATE_DRAGGING, SCROLL_STATE_SETTLING
@Override
public void onPageScrollStateChanged(int i) {
//get state
}
});
}
然后在此功能
指定主要活动的点击监听器 @Override
public Object instantiateItem(ViewGroup parent, int position) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.collection, parent, false);
ImageView imageView = (ImageView) view
.findViewById(R.id.apple);
imageView.setImageResource(R.drawable.apple);
final ImageView back_button = (ImageView) view.findViewById(R.id.back_nav_arrow);
back_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//it doesn't matter if you're already in the first item
viewPager.setCurrentItem(viewPager.getCurrentItem() - 1);
}
});
parent.addView(view,0);
return view;
}
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