Question

旋转屏幕时获取android Spinner NullPointerException

嗨！伙计们，我在旋转器在旋转屏幕时抛出nullPointerExpression时遇到问题

<com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/department_spinner"
            android:hint="@string/select_department"
            android:gravity="center"
            android:drawableEnd="@drawable/spinner_icon"
            android:textColorHighlight="@color/colorButton"
            android:textColor="@color/colorButton"
            android:theme="@style/AppTheme"
            app:met_floatingLabel="highlight"
            android:layout_marginStart="25dp"
            android:layout_marginEnd="25dp"
            android:layout_marginTop="5dp"/>

在我的onCreateView内

    //MaterialBetterSpinner code goes from here
            this.materialDesignSpinner = (MaterialBetterSpinner) findViewById(R.id.department_spinner);
            materialDesignSpinner.setHintTextColor(Color.parseColor("#00BE84"));
            materialDesignSpinner.setTextColor(Color.parseColor("#00BE84"));

            materialDesignSpinner.setTextSize(17);
            materialDesignSpinner.setHighlightColor(Color.parseColor("#00BE84"));
            materialDesignSpinner.setUnderlineColor(Color.parseColor("#00BE84"));

            callDepartment= service.getAllOpdIpdDepartments();

ArrayAdapter<String> departmentAdapter = new ArrayAdapter<>(OpdIpdAnalysis.this, android.R.layout.simple_dropdown_item_1line, new ArrayList<String>());
                materialDesignSpinner.setAdapter(departmentAdapter);

            callDepartment.enqueue(new Callback<List<OpdIpdDepartmentModel>>() {
                @Override
                public void onResponse(Call<List<OpdIpdDepartmentModel>> call, Response<List<OpdIpdDepartmentModel>> response) {
                    departmentLists = response.body();

                    if (departmentLists != null){
                        for (int i = 0; i<departmentLists.size(); i++){
                            spinnerLists.add(departmentLists.get(i).getName());
                        }
                    }


                ArrayAdapter<String> adapter = (ArrayAdapter<String>) materialDesignSpinner.getAdapter();

                adapter.clear();
                adapter.addAll(spinnerLists);
                adapter.notifyDataSetChanged();
                }

这是日志记录器：

E / Android运行时：致命异常：主要流程：com.example.ritecare，PID：15345 java.lang.NullPointerException：尝试调用虚拟方法'void android.widget.Filter.filter（java.lang.CharSequence， android.widget.Filter $ FilterListener）'引用空对象在android.widget.AutoCompleteTextView.performFiltering（AutoCompleteTextView.java:1026）在com.weiwangcn.betterspinner.library.material.MaterialBetterSpinner.onFocusChanged（MaterialBetterSpinner.java:49）在android.view.View.handleFocusGainInternal（View.java:7478）在android.view.View.requestFocusNoSearch（View.java:12441）在android.view.View.requestFocus（View.java:12415）在android.view.View.requestFocus（View.java:12382）在android.view.View.requestFocus（View.java:12324）在com.android.internal.policy.PhoneWindow.restoreHierarchyState（PhoneWindow.java:2166）在android.app.Activity.onRestoreInstanceState（Activity.java:1563）在android.app.Activity.performRestoreInstanceState（Activity.java:1518）在android.app.Instrumentation.callActivityOnRestoreInstanceState（Instrumentation.java:1346）在android.app.ActivityThread.handleStartActivity（ActivityThread.java:3310）在android.app.servertransaction.TransactionExecutor.performLifecycleSequence（TransactionExecutor.java:221）在android.app.servertransaction.TransactionExecutor.cycleToPath（TransactionExecutor.java:201）在android.app.servertransaction.TransactionExecutor.executeLifecycleState（TransactionExecutor.java:173）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:97）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:2016）在android.os.Handler.dispatchMessage（Handler.java:107）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7356）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:492）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:930）

Answer 1

尝试在 MaterialBetterSpinner 初始化期间添加此内容：

ArrayAdapter<String> departmentAdapter = new ArrayAdapter<>(OpdIpdAnalysis.this, android.R.layout.simple_dropdown_item_1line, new ArrayList<String>());
materialDesignSpinner.setAdapter(departmentAdapter);

在 onResponse 内：

ArrayAdapter<String> adapter = (ArrayAdapter<String>) materialDesignSpinner.getAdapter();

adapter.clear()
adapter.addAll(spinnerLists)
adapter.notifyDataSetChanged()

Answer 2

我找到了更好的材料微调器库

我们应该使用ganfra / MaterialSpinner库

简单易用

以下是链接：

https://github.com/ganfra/MaterialSpinner

Android材质微调器NullPointerException on AutoCompleteTextView

2 个答案: