我制作了Custom RecyclerView，其自定义适配器是：
package com.vrishankgupta.todolistfile.Model;
public class CourseAdapter extends
RecyclerView.Adapter<CourseAdapter.CourseViewHolder> {
Context context;
ArrayList<listClass> tasks;
public CourseAdapter(Context context, ArrayList<listClass> tasks) {
this.context = context;
this.tasks = tasks;
}
@Override
public CourseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = li.inflate(viewType,parent,false);
return new CourseViewHolder(itemView);
}
@Override
public int getItemViewType(int position) {
return R.layout.detail;
}
@Override
public void onBindViewHolder(final CourseViewHolder holder, int position) {
final listClass task = tasks.get(position);
holder.tv.setText(task.getTask());
holder.cb.setChecked(task.isActive());
holder.cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
task.setActive(holder.cb.isChecked());
notifyDataSetChanged();
new CourseAdapter(context,tasks);
// Toast.makeText(,task.getTask() + " is " +task.isActive(),Toast.LENGTH_SHORT).show();
}
});
holder.delCb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tasks.remove(task);
notifyDataSetChanged();
new CourseAdapter(context,tasks);
}
});
}
@Override
public int getItemCount() {
return tasks.size();
}
static class CourseViewHolder extends RecyclerView.ViewHolder
{
TextView tv;
CheckBox cb;
ImageButton delCb;
public CourseViewHolder(View converView) {
super(converView);
tv = converView.findViewById(R.id.listtv);
cb = converView.findViewById(R.id.activeCb);
delCb = converView.findViewById(R.id.delCb);
}
}
}
每当我按下CheckBox或删除按钮时，App都会崩溃并显示以下日志：
FATAL EXCEPTION: main Process: com.vrishankgupta.todolistfile, PID: 4993 java.lang.IllegalStateException: Cannot call this method while RecyclerView is computing a layout or scrolling android.support.v7.widget.RecyclerView{99a7f9f VFED..... ......ID 0,270-1080,1536 #7f070058 app:id/recycle}, adapter:com.vrishankgupta.todolistfile.Model.CourseAdapter@da4f8ec, layout:android.support.v7.widget.LinearLayoutManager@59e14b5, context:com.vrishankgupta.todolistfile.RecyclerActivity@d0a1312 at android.support.v7.widget.RecyclerView.assertNotInLayoutOrScroll(RecyclerView.java:2663)
at android.support.v7.widget.RecyclerView$RecyclerViewDataObserver.onChanged(RecyclerView.java:5055)
at android.support.v7.widget.RecyclerView$AdapterDataObservable.notifyChanged(RecyclerView.java:11540)
at android.support.v7.widget.RecyclerView$Adapter.notifyDataSetChanged(RecyclerView.java:6762)
at com.vrishankgupta.todolistfile.Model.CourseAdapter$1.onCheckedChanged(CourseAdapter.java:51)
at android.widget.CompoundButton.setChecked(CompoundButton.java:156)
at com.vrishankgupta.todolistfile.Model.CourseAdapter.onBindViewHolder(CourseAdapter.java:46)
at com.vrishankgupta.todolistfile.Model.CourseAdapter.onBindViewHolder(CourseAdapter.java:19)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6482)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6515)
at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5458)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5724)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5563)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5559)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2229)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1556)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1516)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:608)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3693)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3410)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3962)
at android.view.View.layout(View.java:17653)
at android.view.ViewGroup.layout(ViewGroup.java:5579)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
at android.view.View.layout(View.java:17653)
at android.view.ViewGroup.layout(ViewGroup.java:5579)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17653)
at android.view.ViewGroup.layout(ViewGroup.java:5579)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443)
at android.view.View.layout(View.java:17653)
at android.view.ViewGroup.layout(ViewGroup.java:5579)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17653)
at android.view.ViewGroup.layout(ViewGroup.java:5579)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17653)
at android.view.ViewGroup.layout(ViewGroup.java:5579)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:726)
at android.view.View.layout(View.java:17653)
at android.view.ViewGroup.layout(ViewGroup.java:5579) 12-29 14:51:36.386 4993-4993/com.vrishankgupta.todolistfile E/AndroidRuntime: at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2364)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2086)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1272)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6408)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
at android.view.Choreographer.doCallbacks(Choreographer.java:686)
at android.view.Choreographer.doFrame(Choreographer.java:621)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6165)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)
我的主要活动（如果需要）
public class RecyclerActivity extends AppCompatActivity {
public static final String TAG = "ERROR";
ArrayList<listClass> arr;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recycler);
final Button addButn = findViewById(R.id.addButn);
final EditText etnew = findViewById(R.id.etnew);
final RecyclerView rv = findViewById(R.id.recycle);
int perm = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
if(perm == PackageManager.PERMISSION_GRANTED)
{
arr = (ArrayList<listClass>) readFile();
}
else
{
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},45);
}
final CourseAdapter adapter = new CourseAdapter(this,arr);
rv.setLayoutManager(new LinearLayoutManager(this));
rv.setAdapter(adapter);
addButn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(etnew.getText() == null || etnew.getText().toString().equals(""))
{
Toast.makeText(getApplicationContext(),"Enter Some Data",Toast.LENGTH_SHORT).show();
}
else {
listClass task = new listClass(etnew.getText().toString(), false);
arr.add(task);
etnew.setText("");
rv.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
});
}
void writeFile(ArrayList<listClass> arr)
{
File sdCard = Environment.getExternalStorageDirectory();
File taskFile = new File(sdCard,"taskFile.txt");
try {
FileOutputStream fout = new FileOutputStream(taskFile,false);
ObjectOutputStream objOut = new ObjectOutputStream(fout);
objOut.writeObject(arr);
} catch (IOException e) {
e.printStackTrace();
}
}
Object readFile()
{
boolean cont = true;
try {
File sdCard = Environment.getExternalStorageDirectory();
File task = new File(sdCard,"taskFile.txt");
FileInputStream fin = new FileInputStream(task);
ObjectInputStream objIn = new ObjectInputStream(fin);
while (cont)
{
Object t = objIn.readObject();
if(t!=null)
return t;
else cont = false;
}
}catch (Exception e)
{
Log.e(TAG, "readFile: " );
}
return (Object)new ArrayList<listClass>();
}
@Override
protected void onStop() {
super.onStop();
int perm = ContextCompat.checkSelfPermission(
this,
Manifest.permission.WRITE_EXTERNAL_STORAGE
);
if(perm == PackageManager.PERMISSION_GRANTED)
{
writeFile(arr);
} else{
ActivityCompat.requestPermissions(
this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
44
);
}
}
}
我认为我的CheckBox和删除按钮的OnClickListener存在问题，但无法解决！