Question

我在视图中的每张卡片上都有一个带有复选框的回收站视图。当我点击视图中的特定复选框时，我想取消选中所有其他复选框（条件可能像卡包含奇数等）。我怎样才能做到这一点？我的适配器代码如下。

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);
}
}

在我的Courseslug类中，有一个名为isTrue（）的参数; if，courseSlug.isTrue（）== true;然后哪个卡的复选框满足我的条件，它会被检查，其他未选中/选中的复选框将被取消选中。这就是我想要的。

public class CourseSlug {
String name;
String slug;
boolean preselect;
boolean istrue;

public boolean isTrue() {
    return istrue;
}

public void setisTrue(boolean isTrue) {
    this.isTrue = istrue;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getSlug() {
    return slug;
}

public void setSlug(String slug) {
    this.slug = slug;
}

public boolean isPreselect() {
    return preselect;
}

public void setPreselect(boolean preselect) {
    this.preselect = preselect;
}}

Answer 1

<强>更新

由于您已经提到它足以提供支持CourseSlug课程的解决方案，我现在已经删除了Batch课程并提出了解决方案满足您的需求。检查以下内容：

<强> Example.java

package com.rencsaridogan.stackoverflow;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final ArrayList<CourseSlug> courseSlugs = new ArrayList<>();
    for (int i = 0; i < 10; i++){
      courseSlugs.add(new CourseSlug());
    }

    final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

    final PlatformAdapter platformAdapter = new PlatformAdapter();
    platformAdapter.setCourses(courseSlugs);
    PlatformAdapter.Listener listener = new PlatformAdapter.Listener() {
      @Override public void onCheckedChanged(int position) {
        for (int i = 0; i < courseSlugs.size(); i++){
          if (i != position){
            Log.i("Checked",i + " false" + " (Other)");
            courseSlugs.get(i).setPreselect(false);
          }
        }
        runOnUiThread(new Runnable() {
          @Override public void run() {
            if (!recyclerView.isComputingLayout()) {
              platformAdapter.notifyDataSetChanged();
            }
          }
        });
      }
    };
    platformAdapter.setListener(listener);

    recyclerView.setAdapter(platformAdapter);
  }
}

<强> PlatformAdapter.java

package com.rencsaridogan.stackoverflow;

import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.TextView;
import java.util.ArrayList;

/**
 * Created by rencsaridogan on 16/02/2017.
 */

public class PlatformAdapter extends RecyclerView.Adapter<PlatformAdapter.ViewHolder> {

  ArrayList<CourseSlug> courses;
  Listener listener;

  public void setListener(Listener listener) {
    this.listener = listener;
  }

  public void setCourses(ArrayList<CourseSlug> courses) {
    this.courses = courses;
    notifyDataSetChanged();
  }

  public ArrayList<CourseSlug> getCourses() {
    return courses;
  }

  public PlatformAdapter() {
    courses = 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) {
    final CourseSlug course = courses.get(position);
    holder.enrolment.setText(course.getName());
    holder.selectEnrollment.setChecked(course.isPreselect());
    holder.selectEnrollment.setOnClickListener(new View.OnClickListener() {
      @Override public void onClick(View view) {
        Log.i("Checked", holder.getAdapterPosition() + " " + holder.selectEnrollment.isChecked());
        course.setPreselect(holder.selectEnrollment.isChecked());
        if (holder.selectEnrollment.isChecked() && listener != null) {
          listener.onCheckedChanged(holder.getAdapterPosition());
        }
      }
    });
  }

  @Override public int getItemCount() {
    return 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);
    }
  }

  @Override public long getItemId(int position) {
    return super.getItemId(position);
  }

  public interface Listener {
    void onCheckedChanged(int position);
  }
}

<强> CourseSlug.java

package com.rencsaridogan.stackoverflow;

/**
 * Created by rencsaridogan on 16/02/2017.
 */

public class CourseSlug {
  String name;
  String slug;
  boolean preselect;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getSlug() {
    return slug;
  }

  public void setSlug(String slug) {
    this.slug = slug;
  }

  public boolean isPreselect() {
    return preselect;
  }

  public void setPreselect(boolean preselect) {
    this.preselect = preselect;
  }
}

由于您拥有CourseSlug变量，因此您不需要preselect中的其他布尔值。我已经在设备（LG Nexus 5）的真实环境中对此进行了检查，我可以肯定地说它有效。

Answer 2

将以下方法添加到适配器，并在按下selectAll复选框时调用它。

public void unselectAll(int checkedIndex){
        for(int i=0; i<courses.size(); i++){
            if(i == checkedIndex){
                courses.get(i).setPreselect(true);
                continue;
            }
            courses.get(i).setPreselect(false);
        }
        notifyDataSetChanged();
    }

使用：

yourCheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                unselectAll(position);
            }
        });

Answer 3

这是一个很好的解决方案。在interface

中创建adapter

public interface OnCheckChangedListener {
    void onItemCheckedChange(yourList list , Index indexOfCheckedItem);
}

同样在适配器中创建它的实例

 OnCheckChangedListiner listener;

现在将interface传递到constructor的{{1}}。或者您可以在recyleview中创建其设置器。

adapter

现在public void setListiner (OnCheckChangedListiner listener ){ this.listener = listener; } implement listener或activity中的fragment，并且在创建instance的{{1}}之后，您可以设置此adapter listener 1}}喜欢这个

 platformAdapter.setListener(YourFragmentName.this);

现在使用adapter onCheckChanged方法执行此操作

if (listener !=null ) {
listener.onItemCheckedChange(yourList list , Index indexOfCheckedItem);
}

由于implemented或listener中有fragment个activity，因此您获得了已检查项目的索引和整个列表（列表已通过，因为您可能实现滚动以加载或删除可能更改片段中原始列表的功能。 Loop遍历整个列表并更改currentChecked项的数据并调用notifyDataSetChanged();。通过这种方式，您还可以防止糟糕的用户体验。如果需要，您还可以重新创建adapter的新实例。

回收站视图中的复选框问题

3 个答案: