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我想将动态按钮添加到网格布局,如下所示。 每次添加一个按钮,并且布局必须自行更新以使按钮成行。 我的问题是,当添加一个新按钮时,它会出现在最后添加的按钮之上,并且不会以行格式放置。在下面的这张图片中,我展示了我想要的以及当前正在发生的事情,其中标有数字的方 block 是我的按钮。在我所拥有的图像中,我在布局中添加了 6 个按钮,但它们都在彼此之上。
我四处查看如何执行此操作,并向我推荐我使用 RecyclerView
和 GridLayoutManager
。我已将此添加到我的代码中,但就像我说的那样问题是当我添加一个按钮,然后如果我添加另一个按钮,第二个按钮将添加到第一个按钮之上。我是什么如果我的按钮是预设的,则可以使用,但不适用于动态按钮。
这是我的代码:
Main Fragment 启动 RecyclerView
。我有另一个启动 createButton()
方法并传递 drawable 和 String 的 Activity 。这些可绘制对象和字符串根据用户的操作一次一个地传递给此方法,并一次一个地创建一个图像按钮。
public class MyFragment extends Fragment {
private GridLayoutManager lLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
// onCreateView
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.my_fragment, container, false);
// Get screen size to have different layouts for phone and tablet
int screenSize = getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK;
String toastMsg;
switch (screenSize) {
case Configuration.SCREENLAYOUT_SIZE_LARGE:
toastMsg = "Large screen";
Log.d("tag_name", "Large screen");
break;
case Configuration.SCREENLAYOUT_SIZE_NORMAL:
toastMsg = "Normal screen";
Log.d("tag_name", "Normal screen");
break;
case Configuration.SCREENLAYOUT_SIZE_SMALL:
toastMsg = "Small screen";
Log.d("tag_name", "Small screen");
break;
default:
toastMsg = "Screen size is neither large, normal or small";
Log.d("tag_name", "Screen size is not large, normal, or small");
}
Toast.makeText(getActivity(), toastMsg, Toast.LENGTH_LONG).show();
// Create an empty list to initialize the adapter (or else get nullPointerException error)
List<ItemObject> myList = new ArrayList<ItemObject>();
// 3 rows for tablet
// 2 rows for phone
if (screenSize == Configuration.SCREENLAYOUT_SIZE_LARGE
|| screenSize == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
lLayout = new GridLayoutManager(getActivity(), 3, GridLayoutManager.HORIZONTAL, false);
} else
lLayout = new GridLayoutManager(getActivity(), 2, GridLayoutManager.HORIZONTAL, false);
RecyclerView rView = (RecyclerView) view.findViewById(R.id.recycler_view);
rView.setHasFixedSize(true);
rView.setLayoutManager(lLayout);
RecyclerViewAdapter rcAdapter = new RecyclerViewAdapter(getActivity(), myList);
rView.setAdapter(rcAdapter);
return view;
}
private List<ItemObject> getAllItemList(String applicationName, Drawable app_drawable) {
List<ItemObject> allItems = new ArrayList<ItemObject>();
allItems.add(new ItemObject(applicationName, app_drawable));
return allItems;
}
public void createButton(Drawable d, String appName) {
List<ItemObject> rowListItem = getAllItemList(appName, d);
lLayout = new GridLayoutManager(getActivity(), 2, GridLayoutManager.HORIZONTAL, false);
RecyclerView rView = (RecyclerView) getView().findViewById(R.id.recycler_view);
rView.setHasFixedSize(true);
rView.setLayoutManager(lLayout);
RecyclerViewAdapter rcAdapter = new RecyclerViewAdapter(getActivity(), rowListItem);
rView.setAdapter(rcAdapter);
}
}
我的布局(my_fragment):
<LinearLayout android:id="@+id/my_fragment"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="15dp"
android:gravity="center_horizontal">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scrollbars="horizontal"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
android:id="@+id/new_app_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/new_app_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/new_app_button"
android:gravity="center"/>
</RelativeLayout>
</LinearLayout>
编辑
这是我为 MyFragment 更新的代码现在我在添加第二个 ImageButton 时收到 nullPointerException
public class MyFragment extends Fragment {
private GridLayoutManager lLayout;
private ButtonCreator bc;
RecyclerViewAdapter rcAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
List<ItemObject> myList = new ArrayList<ItemObject>();
rcAdapter = new RecyclerViewAdapter(getActivity(),myList);
}
// onCreateView
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.home_fragment, container, false);
// Get screen size so we can have different layouts for phone and tablet
int screenSize = getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK;
String toastMsg;
switch(screenSize) {
case Configuration.SCREENLAYOUT_SIZE_LARGE:
toastMsg = "Large screen";
Log.d("tag_name", "Large screen");
break;
case Configuration.SCREENLAYOUT_SIZE_NORMAL:
toastMsg = "Normal screen";
Log.d("tag_name", "Normal screen");
break;
case Configuration.SCREENLAYOUT_SIZE_SMALL:
toastMsg = "Small screen";
Log.d("tag_name", "Small screen");
break;
default:
toastMsg = "Screen size is neither large, normal or small";
Log.d("tag_name", "Screen size is not large, normal, or small");
}
Toast.makeText(getActivity(), toastMsg, Toast.LENGTH_LONG).show();
// Create an empty list to initialize the adapter (or else get nullPointerException error)
if (screenSize == Configuration.SCREENLAYOUT_SIZE_LARGE
|| screenSize == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
lLayout = new GridLayoutManager(getActivity(), 3, GridLayoutManager.HORIZONTAL, false);
}
else lLayout = new GridLayoutManager(getActivity(), 2, GridLayoutManager.HORIZONTAL, false);
RecyclerView rView = (RecyclerView)view.findViewById(R.id.recycler_view);
rView.setHasFixedSize(true);
rView.setLayoutManager(lLayout);
rView.setAdapter(rcAdapter);
return view;
}
private List<ItemObject> getAllItemList(String applicationName, Drawable app_drawable){
List<ItemObject> allItems = new ArrayList<ItemObject>();
allItems.add(new ItemObject(applicationName, app_drawable));
return allItems;
}
public void createButton (Drawable d, String appName){
rcAdapter.addItem(new ItemObject(appName , d));
}
// In order to get the view of HomeFragment correctly
public interface ButtonCreator{
void buttonCreator(Drawable d, String string);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
bc = (ButtonCreator) activity;
}
}
我如何在 MyFragment 中调用 createButton 方法(在 runOnUiThread 方法中调用)
public class MainActivity extends FragmentActivity implements MyFragment.ButtonCreator {
private Thread repeatTaskThread;
private byte[] byteArray;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.container, new MyFragment()).commit();
}
public void buttonCreator(Drawable d,String a) {
MyFragment homeFragment = (MyFragment)getSupportFragmentManager().getFragments().get(1);
homeFragment.createButton(d, a);
}
public void RepeatTask(){
repeatTaskThread = new Thread() {
public void run() {
while (true) {
try {
System.out.println("TRY_1");
Socket socket = new Socket("192.168.0.26", 5050);
// Get data sent through socket
DataInputStream DIS = new DataInputStream(socket.getInputStream());
System.out.println("DataInputStream Started");
// read data that got sent
final String applicationName = DIS.readUTF();
// read array data for bitmap
int len = DIS.readInt();
byte[] data = new byte[len];
DIS.readFully(data, 0, data.length);
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
final Drawable d = new BitmapDrawable(getResources(), bitmap);
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
Log.d("tag_name", "Try_2");
buttonCreator(d,applicationName);
}
});
socket.close();
} catch (Exception e) {
System.out.println("Exception is " + e.toString());
}
try {
// Sleep for 5 seconds
Thread.sleep(5000);
} catch (Exception e) {
e.printStackTrace();
}
}
}
;
};
repeatTaskThread.start();
}
}
当我的应用程序在创建第二个按钮时崩溃时我的错误:
05-11 17:05:25.275 14257-14257/it.anddev.bradipao.janus E/RecyclerView: No adapter attached; skipping layout
05-11 17:05:25.275 14257-14257/it.anddev.bradipao.janus D/AndroidRuntime: Shutting down VM
05-11 17:05:25.275 14257-14257/it.anddev.bradipao.janus W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x437c0160)
05-11 17:05:25.305 14257-14257/it.anddev.bradipao.janus E/AndroidRuntime: FATAL EXCEPTION: main
Process: it.anddev.bradipao.janus, PID: 14257
java.lang.NullPointerException
at android.support.v7.widget.RecyclerView.computeHorizontalScrollRange(RecyclerView.java:1518)
at android.view.View.onDrawScrollBars(View.java:12248)
at android.view.View.draw(View.java:14794)
at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:3171)
at android.view.View.getDisplayList(View.java:13655)
at android.view.View.getDisplayList(View.java:13697)
at android.view.View.draw(View.java:14505)
at android.view.ViewGroup.drawChild(ViewGroup.java:3134)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2971)
at android.view.View.getDisplayList(View.java:13650)
at android.view.View.getDisplayList(View.java:13697)
at android.view.View.draw(View.java:14505)
at android.view.ViewGroup.drawChild(ViewGroup.java:3134)
at android.support.v7.widget.RecyclerView.drawChild(RecyclerView.java:3693)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2971)
at android.view.View.draw(View.java:14791)
at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:3171)
at android.view.View.getDisplayList(View.java:13655)
at android.view.View.getDisplayList(View.java:13697)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3108)
at android.view.View.getDisplayList(View.java:13593)
at android.view.View.getDisplayList(View.java:13697)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3108)
at android.view.View.getDisplayList(View.java:13593)
at android.view.View.getDisplayList(View.java:13697)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3108)
at android.view.View.getDisplayList(View.java:13593)
at android.view.View.getDisplayList(View.java:13697)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3108)
at android.view.View.getDisplayList(View.java:13593)
at android.view.View.getDisplayList(View.java:13697)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3108)
at android.view.View.getDisplayList(View.java:13593)
at android.view.View.getDisplayList(View.java:13697)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3108)
at android.view.View.getDisplayList(View.java:13593)
at android.view.View.getDisplayList(View.java:13697)
at android.view.HardwareRenderer$GlRenderer.buildDisplayList(HardwareRenderer.java:1570)
at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1449)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2476)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2300)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1929)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1043)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:771)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:757)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:788)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:604)
at dalvik.system.NativeStart.main(Native Method)
最佳答案
做这样的事情
public class MyFragment extends Fragment {
private GridLayoutManager lLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
// onCreateView
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.my_fragment, container, false);
// Get screen size to have different layouts for phone and tablet
int screenSize = getResources().getConfiguration().screenLayout &
Configuration.SCREENLAYOUT_SIZE_MASK;
String toastMsg;
switch (screenSize) {
case Configuration.SCREENLAYOUT_SIZE_LARGE:
toastMsg = "Large screen";
Log.d("tag_name", "Large screen");
break;
case Configuration.SCREENLAYOUT_SIZE_NORMAL:
toastMsg = "Normal screen";
Log.d("tag_name", "Normal screen");
break;
case Configuration.SCREENLAYOUT_SIZE_SMALL:
toastMsg = "Small screen";
Log.d("tag_name", "Small screen");
break;
default:
toastMsg = "Screen size is neither large, normal or small";
Log.d("tag_name", "Screen size is not large, normal, or small");
}
Toast.makeText(getActivity(), toastMsg, Toast.LENGTH_LONG).show();
// Create an empty list to initialize the adapter (or else get nullPointerException error)
// 3 rows for tablet
// 2 rows for phone
if (screenSize == Configuration.SCREENLAYOUT_SIZE_LARGE
|| screenSize == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
lLayout = new GridLayoutManager(getActivity(), 3, GridLayoutManager.HORIZONTAL, false);
} else
lLayout = new GridLayoutManager(getActivity(), 2, GridLayoutManager.HORIZONTAL, false);
RecyclerView rView = (RecyclerView) view.findViewById(R.id.recycler_view);
rView.setHasFixedSize(true);
rView.setLayoutManager(lLayout);
rView.setAdapter(rcAdapter);
return view;
}
RecyclerViewAdapter rcAdapter;
private List<ItemObject> getAllItemList(String applicationName, Drawable app_drawable) {
List<ItemObject> allItems = new ArrayList<ItemObject>();
allItems.add(new ItemObject(applicationName, app_drawable));
return allItems;
}
public void createButton(Drawable d, String appName) {
rcAdapter.addItem(new ItemObject(appName , d))
}
}
然后在适配器中添加这个方法
public void addItem(int position) {
list.add(position);
notifyItemInserted(position);
notifyItemRangeChanged(position, list.size());
}
编辑
为了防止出现警告,请尝试将您的适配器初始化移动到 onCreate
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
List<ItemObject> myList = new ArrayList<ItemObject>();
rcAdapter = new RecyclerViewAdapter(getActivity(), myList);
}
关于java - 使用 RecyclerView 添加到 GridLayout 的动态按钮相互叠加,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37170063/
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