根据android中回收器视图中的复选框选择更改按钮状态
我有一个带有适配器类的回收器视图。在单项视图中,还有一个复选框。在我的布局视图中,它包含一个按钮和上面提到的回收器视图。当我选中视图中的任何复选框时,按钮应被激活(将颜色更改为活动)。当未选择任何内容时,视图按钮应以停用的形式显示。我怎么可能?有什么例子吗?代码如下根据android中回收器视图中的复选框选择更改按钮状态,android,checkbox,android-recyclerview,Android,Checkbox,Android Recyclerview,我有一个带有适配器类的回收器视图。在单项视图中,还有一个复选框。在我的布局视图中,它包含一个按钮和上面提到的回收器视图。当我选中视图中的任何复选框时,按钮应被激活(将颜色更改为活动)。当未选择任何内容时,视图按钮应以停用的形式显示。我怎么可能?有什么例子吗?代码如下 public class PlatformAdapter extends RecyclerView.Adapter<PlatformAdapter.ViewHolder> { ArrayList<Batch>
public class PlatformAdapter extends RecyclerView.Adapter<PlatformAdapter.ViewHolder> {
ArrayList<Batch> batches;
ArrayList<CourseSlug> courses;
boolean isInstituteStudent;
public void setBatches(ArrayList<Batch> batches) {
this.batches = batches;
notifyDataSetChanged();
}
public void setCourses(ArrayList<CourseSlug> courses) {
this.courses = courses;
notifyDataSetChanged();
}
public ArrayList<CourseSlug> getCourses() {
return courses;
}
public ArrayList<Batch> getBatches() {
return batches;
}
public void setInstituteStudent(boolean instituteStudent) {
isInstituteStudent = instituteStudent;
}
public boolean isInstituteStudent() {
return isInstituteStudent;
}
public PlatformAdapter() {
courses = new ArrayList<>();
batches = new ArrayList<>();
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_cell_platform_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
if (isInstituteStudent) {
Batch batch = batches.get(position);
holder.enrolment.setText(batch.getName());
holder.selectEnrollment.setChecked(batch.isPreselect());
} else {
final CourseSlug course = courses.get(position);
holder.enrolment.setText(course.getName());
holder.selectEnrollment.setChecked(course.isPreselect());
}
}
@Override
public int getItemCount() {
return isInstituteStudent ? batches.size() : courses.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView enrolment;
CheckBox selectEnrollment;
public ViewHolder(final View itemView) {
super(itemView);
enrolment = (TextView) itemView.findViewById(R.id.tv_entrollment);
selectEnrollment = (CheckBox) itemView.findViewById(R.id.cb_select_entrollment);
selectEnrollment.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
int index = getLayoutPosition();
if(isInstituteStudent) {
Batch batch = batches.get(index);
batch.setPreselect(b);
} else {
CourseSlug course = courses.get(index);
course.setPreselect(b);
}
}
});
}
}
@Override
public long getItemId(int position) {
return super.getItemId(position);
}
}
公共类PlatformAdapter扩展了RecyclerView.Adapter{
ArrayList批次;
ArrayList课程;
布尔是学生;
公共作废收件批次(ArrayList批次){
this.batches=批次;
notifyDataSetChanged();
}
公共课程(ArrayList课程){
本课程=课程;
notifyDataSetChanged();
}
公共阵列列表getCourses(){
返回课程;
}
公共ArrayList getBatches(){
退货批次;
}
public void setInstituteStudent(布尔instituteStudent){
isInstituteStudent=学院学生;
}
公共布尔值isInstituteStudent(){
返回是机构学生;
}
公共平台适配器(){
courses=newarraylist();
批次=新的ArrayList();
}
@凌驾
public ViewHolder onCreateViewHolder(视图组父级,int-viewType){
View View=LayoutInflater.from(parent.getContext()).flate(R.layout.list\u cell\u platform\u item,parent,false);
返回新的ViewHolder(视图);
}
@凌驾
公共无效onBindViewHolder(最终视图持有人,最终整型位置){
如果(isInstituteStudent){
批次=批次。获取(位置);
holder.registration.setText(batch.getName());
holder.selectEnrollment.setChecked(batch.isPreselect());
}否则{
最终课程推送课程=课程。获取(位置);
holder.registration.setText(course.getName());
holder.selectEnrollment.setChecked(course.isPreselect());
}
}
@凌驾
public int getItemCount(){
返回isInstituteStudent?batches.size():courses.size();
}
类ViewHolder扩展了RecyclerView.ViewHolder{
TextView注册;
复选框选择注册;
公共视图持有者(最终视图项视图){
超级(项目视图);
注册=(TextView)itemView.findViewById(R.id.tv\u entrollment);
selectEnrollment=(复选框)itemView.findViewById(R.id.cb\u select\u entrollment);
选择Enrollment.setOnCheckedChangeListener(新建CompoundButton.OnCheckedChangeListener(){
@凌驾
检查更改后的公共无效(复合按钮复合按钮,布尔b){
int index=getLayoutPosition();
如果(isInstituteStudent){
Batch=batches.get(索引);
批次设置预选(b);
}否则{
CourseSlug course=courses.get(索引);
课程设置预选(b);
}
}
});
}
}
@凌驾
公共长getItemId(int位置){
返回super.getItemId(位置);
}
}
下面给出了我的Recyclerview和button实现类
public class SelectPlatform extends BaseActivity {
PlatformAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_platform);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
initializeViews(
findViewById(R.id.ll_content_area),
findViewById(R.id.tv_error),
findViewById(R.id.pb_loading)
);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rv_platform);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new PlatformAdapter();
recyclerView.setAdapter(adapter);
private void renderCourses(ArrayList<CourseSlug> courses) {
getSupportActionBar().setTitle("Select Courses");
TextView title = (TextView) findViewById(R.id.tv_select_enrollment);
title.setText("Select your courses");
adapter.setInstituteStudent(false);
adapter.setCourses(courses);
}
private void renderInstitute(Institute institute) {
getSupportActionBar().setTitle("Select Batches");
TextView title = (TextView) findViewById(R.id.tv_select_enrollment);
title.setText("Select your batches at " + institute.getName());
adapter.setInstituteStudent(true);
adapter.setBatches(institute.getBatches());
// Save institute name
SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(this).edit();
editor.putString("institute_name", institute.getName());
editor.commit();
}
public void onButtonClick(View view) {
findViewById(R.id.pb_loading).setVisibility(View.VISIBLE);
findViewById(R.id.tv_error).setVisibility(View.GONE);
findViewById(R.id.ll_content_area).setVisibility(View.GONE);
if(adapter.isInstituteStudent()) {
ArrayList<Batch> batches = adapter.getBatches();
ArrayList<Integer> batchIds = new ArrayList<>();
for(Batch batch: batches) {
if(batch.isPreselect())
batchIds.add(batch.getId());
}
GeneralApiService.addBatches(this, batchIds);
} else {
ArrayList<CourseSlug> courses = adapter.getCourses();
ArrayList<String> courseSlgus = new ArrayList<>();
for(CourseSlug course: courses) {
if(course.isPreselect())
courseSlgus.add(course.getSlug());
}
GeneralApiService.addCourses(this, courseSlgus);
}
new SavePlatformNamesTask().execute();
}
公共类SelectPlatform扩展了BaseActivity{
平台适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u select\u platform);
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
初始化视图(
findViewById(R.id.ll_内容区),
findViewById(R.id.tv_错误),
findViewById(R.id.pb\U加载)
);
RecyclerView RecyclerView=(RecyclerView)findViewById(R.id.rv_平台);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(新的LinearLayoutManager(本));
适配器=新平台适配器();
recyclerView.setAdapter(适配器);
私人课程(ArrayList课程){
getSupportActionBar().setTitle(“选择课程”);
TextView title=(TextView)findViewById(R.id.tv\u select\u注册);
title.setText(“选择您的课程”);
adapter.setInstituteStudent(false);
设置课程(courses);
}
私人机构(研究所){
getSupportActionBar().setTitle(“选择批次”);
TextView title=(TextView)findViewById(R.id.tv\u select\u注册);
title.setText(“在“+institute.getName()”中选择批次);
adapter.setInstituteStudent(true);
adapter.setBatches(institute.getBatches());
//保存机构名称
SharedReferences.Editor=PreferenceManager.GetDefaultSharedReferences(this.edit();
putString(“institute_name”,institute.getName());
commit();
}
公用作废按钮单击(查看){
findViewById(R.id.pb_加载).setVisibility(View.VISIBLE);
findViewById(R.id.tv_错误)。设置可见性(View.GONE);
findviewbyd(R.id.ll\u content\u area).setVisibility(View.go);
if(适配器.isInstituteStudent()){
ArrayList batches=adapter.getBatches();
ArrayList BatchId=新的ArrayList();
用于(批次:批次){
if(batch.isPreselect())
add(batch.getId());
}
addBatchs(这是batchId);
}否则{
ArrayList courses=adapter.getCourses();
ArrayList Courselgus=新的ArrayList();
适用于(课程附加课程:课程){
if(course.isPreselect())
courseSlgus.add(course.getSlug());
}
GeneralApiService.addCourses(这是courseSlgus);
}
新建SavePlatformNamesTask().execute();
}
像这样在适配器类中发送按钮引用。
public void setbatch(数组列表批次,按钮按钮)并根据需要执行任何操作。在
选择平台中设置一个字段变量,并将其设置为0
private int checkedBoxs = 0;
和还可以在Sel中公开方法
public void updateButtonState(int num){
checkedBoxs+=num;
if(checkedBoxs > 0){
//Activate the BTN
}else{
//Deactivate the BTN
}
}
adapter = new PlatformAdapter(SelectPlatform.this);
private SelectPlatform mThis;
public PlatformAdapter(SelectPlatform activity) {
courses = new ArrayList<>();
batches = new ArrayList<>();
mThis = activity;
}
selectEnrollment.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if(selectEnrollment.isChecked()) {
mThis.updateState(1);
} else {
mThis.updateState(-1);
}
});
private MyInterface mListener;
public MyAdpater(Context context, MyInterface listener) {
this.mListener = listener;
}
selectEnrollment.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
// make a callback
mListener.onCheckBoxClick(true);
int index = getLayoutPosition();
if(isInstituteStudent) {
Batch batch = batches.get(index);
batch.setPreselect(b);
} else {
CourseSlug course = courses.get(index);
course.setPreselect(b);
}
}
});
public interface MyInterface {
void onCheckBoxClick(boolean isAnyChecked);
}
public class MyActivity extends Activity implements MyAdapter.MyInterface {
// other stuff....
// Pass listener instance when initializing adapter
MyAdapter adapter = new MyAdapter(MyActivity.this, this);
@Override
public void onCheckBoxClick(boolean isAnyChecked) {
if(isAnyChecked) {
// Activate button
} else {
// Deactivate button
}
}
}