能否让 ListView
水平显示?我已经使用了一个画廊视图来实现此功能,但是选定的项会自动移动到屏幕中央。我不想让选定的项停留在我点击的同一位置。有什么解决办法吗?我的想法是将 ListView
设置为水平滚动。请分享您的想法?
能否让 ListView
水平显示?我已经使用了一个画廊视图来实现此功能,但是选定的项会自动移动到屏幕中央。我不想让选定的项停留在我点击的同一位置。有什么解决办法吗?我的想法是将 ListView
设置为水平滚动。请分享您的想法?
RecyclerView
是在列表视图中组织项目并水平显示的新方法。
优点:
RecyclerView
的更多信息:
示例:
只需添加以下代码块,即可使 ListView
从垂直变为水平
代码片段
LinearLayoutManager layoutManager= new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false);
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(layoutManager);
Paul不费心修复他的库中的错误,也不接受用户提供的修复。因此,我建议使用另一个功能类似的库:
https://github.com/sephiroth74/HorizontalVariableListView
更新:在2013年7月24日,作者(sephiroth74)基于android 4.2.2 ListView的代码发布了完全重写的版本。我必须说,它没有之前版本中存在的所有错误,并且运行良好!
@Paul的答案提供了一个很好的解决方案,但是此代码不允许在项目子元素上使用onClickListeners(回调函数从未被调用)。我已经苦苦挣扎了一段时间,终于找到了解决方案,并决定在这里发布修改后的代码(以防有人需要)。
不要覆盖dispatchTouchEvent
方法,而是覆盖onTouchEvent
方法。 使用与dispatchTouchEvent
相同的代码并删除该方法(您可以在此http://developer.android.com/guide/topics/ui/ui-events.html#EventHandlers了解两者之间的区别)
@Override
public boolean onTouchEvent(MotionEvent event) {
boolean handled = mGesture.onTouchEvent(event);
return handled;
}
接下来,添加以下代码,该代码将决定从项子元素那里夺取该事件并将其交给我们的onTouchEvent
处理,或者让它由它们处理。
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch( ev.getActionMasked() ){
case MotionEvent.ACTION_DOWN:
mInitialX = ev.getX();
mInitialY = ev.getY();
return false;
case MotionEvent.ACTION_MOVE:
float deltaX = Math.abs(ev.getX() - mInitialX);
float deltaY = Math.abs(ev.getY() - mInitialY);
return ( deltaX > 5 || deltaY > 5 );
default:
return super.onInterceptTouchEvent(ev);
}
}
最后,不要忘记在你的类中声明变量:
private float mInitialX;
private float mInitialY;
com.android.support:recyclerview-v7:23.0.1
这是一个示例:
public class MyActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_activity);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
recyclerView.setLayoutManager(layoutManager);
MyAdapter adapter = new MyAdapter(myDataset);
recyclerView.setAdapter(adapter);
}
}
有关RecyclerView的更多信息:
这篇文章有点晚(很晚),但我会发布它以便以后有人可以看到。
截至Android L预览版,支持库中有一个RecyclerView
恰好符合你的需求。
现在,你只能通过L preview SDK获取它,并且需要将minSdk
设置为L
。但是,你可以将所有必要的文件复制到你的项目中,并以这种方式使用它们,直到L正式发布。
你可以在这里下载预览文档。
注意:RecyclerView 的 API 可能会发生更改,也可能存在漏洞。
更新
水平列表视图的源代码如下:
LinearLayoutManager layoutManager
= new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
RecyclerView myList = findViewById(R.id.my_recycler_view);
myList.setLayoutManager(layoutManager);
LinearLayoutManager
- 参见此处:https://dev59.com/Jl4b5IYBdhLWcg3w-1-c - Stéphane从这里下载jar文件。
现在将其放入您的libs文件夹中,右键单击它并选择“作为库添加”。
现在在main.xml中放置此代码。
<com.devsmart.android.ui.HorizontalListView
android:id="@+id/hlistview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
现在如果您想在Activity类中使用带图像的水平列表视图,则可以使用以下代码:
HorizontalListView hListView = (HorizontalListView) findViewById(R.id.hlistview);
hListView.setAdapter(new HAdapter(this));
private class HAdapter extends BaseAdapter {
LayoutInflater inflater;
public HAdapter(Context context) {
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return Const.template.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
HViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listinflate, null);
holder = new HViewHolder();
convertView.setTag(holder);
} else {
holder = (HViewHolder) convertView.getTag();
}
holder.img = (ImageView) convertView.findViewById(R.id.image);
holder.img.setImageResource(Const.template[position]);
return convertView;
}
}
class HViewHolder {
ImageView img;
}
其实非常简单:只需将列表视图旋转到侧面
mlistView.setRotation(-90);
然后,在填充子项时(应该在getView方法中),将子项旋转回原位:
mylistViewchild.setRotation(90);
编辑:如果旋转后您的ListView不合适,请将ListView放置在此RotateLayout中,像这样:
<com.github.rongi.rotate_layout.layout.RotateLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:angle="90"> <!-- Specify rotate angle here -->
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</com.github.rongi.rotate_layout.layout.RotateLayout>
我开发了一种逻辑来实现它,而不使用任何外部水平滚动库,这是我实现的水平视图,并在此处发布了我的答案:https://stackoverflow.com/a/33301582/5479863
我的JSON响应是:
{"searchInfo":{"status":"1","message":"Success","clist":[{"id":"1de57434-795e-49ac-0ca3-5614dacecbd4","name":"Theater","image_url":"http://52.25.198.71/miisecretory/category_images/movie.png"},{"id":"62fe1c92-2192-2ebb-7e92-5614dacad69b","name":"CNG","image_url":"http://52.25.198.71/miisecretory/category_images/cng.png"},{"id":"8060094c-df4f-5290-7983-5614dad31677","name":"Wine-shop","image_url":"http://52.25.198.71/miisecretory/category_images/beer.png"},{"id":"888a90c4-a6b0-c2e2-6b3c-561788e973f6","name":"Chemist","image_url":"http://52.25.198.71/miisecretory/category_images/chemist.png"},{"id":"a39b4ec1-943f-b800-a671-561789a57871","name":"Food","image_url":"http://52.25.198.71/miisecretory/category_images/food.png"},{"id":"c644cc53-2fce-8cbe-0715-5614da9c765f","name":"College","image_url":"http://52.25.198.71/miisecretory/category_images/college.png"},{"id":"c71e8757-072b-1bf4-5b25-5614d980ef15","name":"Hospital","image_url":"http://52.25.198.71/miisecretory/category_images/hospital.png"},{"id":"db835491-d1d2-5467-a1a1-5614d9963c94","name":"Petrol-Pumps","image_url":"http://52.25.198.71/miisecretory/category_images/petrol.png"},{"id":"f13100ca-4052-c0f4-863a-5614d9631afb","name":"ATM","image_url":"http://52.25.198.71/miisecretory/category_images/atm.png"}]}}
布局文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="5">
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4" />
<HorizontalScrollView
android:id="@+id/horizontalScroll"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<LinearLayout
android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="horizontal">
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
类文件:
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.ll);
for (int v = 0; v < collectionInfo.size(); v++) {
/*---------------Creating frame layout----------------------*/
FrameLayout frameLayout = new FrameLayout(ActivityMap.this);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT, getPixelsToDP(90));
layoutParams.rightMargin = getPixelsToDP(10);
frameLayout.setLayoutParams(layoutParams);
/*--------------end of frame layout----------------------------*/
/*---------------Creating image view----------------------*/
final ImageView imgView = new ImageView(ActivityMap.this); //create imageview dynamically
LinearLayout.LayoutParams lpImage = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
imgView.setImageBitmap(collectionInfo.get(v).getCatImage());
imgView.setLayoutParams(lpImage);
// setting ID to retrieve at later time (same as its position)
imgView.setId(v);
imgView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// getting id which is same as its position
Log.i(TAG, "Clicked on " + collectionInfo.get(v.getId()).getCatName());
// getting selected category's data list
new GetSelectedCategoryData().execute(collectionInfo.get(v.getId()).getCatID());
}
});
/*--------------end of image view----------------------------*/
/*---------------Creating Text view----------------------*/
TextView textView = new TextView(ActivityMap.this);//create textview dynamically
textView.setText(collectionInfo.get(v).getCatName());
FrameLayout.LayoutParams lpText = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT, Gravity.BOTTOM | Gravity.CENTER);
// Note: LinearLayout.LayoutParams 's gravity was not working so I putted Framelayout as 3 paramater is gravity itself
textView.setTextColor(Color.parseColor("#43A047"));
textView.setLayoutParams(lpText);
/*--------------end of Text view----------------------------*/
//Adding views at appropriate places
frameLayout.addView(imgView);
frameLayout.addView(textView);
linearLayout.addView(frameLayout);
}
private int getPixelsToDP(int dp) {
float scale = getResources().getDisplayMetrics().density;
int pixels = (int) (dp * scale + 0.5f);
return pixels;
}
getPixelsToDP()
方法吗? - Skizo-ozᴉʞS ツViewPager
小部件。它不像 Gallery
一样被锁定在中心位置,并且内置了回收视图的特性(就像 ListView
)。你可能会在 Google Play 应用中看到类似的方法,每当你处理水平滚动列表时。PagerAdapter
并在那里执行一些调整。public class MyPagerAdapter extends PagerAdapter {
private Context mContext;
public MyPagerAdapter(Context context) {
this.mContext = context;
}
// As per docs, you may use views as key objects directly
// if they aren't too complex
@Override
public Object instantiateItem(ViewGroup container, int position) {
LayoutInflater inflater = LayoutInflater.from(mContext);
View view = inflater.inflate(R.layout.item, null);
container.addView(view);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public int getCount() {
return 10;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
// Important: page takes all available width by default,
// so let's override this method to fit 5 pages within single screen
@Override
public float getPageWidth(int position) {
return 0.2f;
}
}
这并不是一个很好的答案,但是你可以尝试使用水平滚动视图。