Question

class SearchViewHolder extends RecyclerView.ViewHolder{

    TextView studentName, studentMatrik, studentPhone, studentAddress, studentStatus, studentMail, studentCon, studentId;
    CheckBox checkBox;
    Button buttonMap;
    DatabaseReference databaseReference;
    SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    boolean isChecked = sharedPreferences.getBoolean("checked", false);
    public SearchViewHolder(View itemView) {
        super(itemView);
        studentName = (TextView) itemView.findViewById(R.id.studentName);
        studentMatrik = (TextView) itemView.findViewById(R.id.studentMatrik);
        studentPhone = (TextView) itemView.findViewById(R.id.studentPhone);
        studentAddress = (TextView) itemView.findViewById(R.id.studentAddress);
        studentStatus = (TextView) itemView.findViewById(R.id.studentStatus);
        studentMail = (TextView) itemView.findViewById(R.id.studentMail);
        studentCon = (TextView) itemView.findViewById(R.id.studentCon);
        studentId = (TextView) itemView.findViewById(R.id.studentId);
        checkBox = (CheckBox) itemView.findViewById(R.id.checkBox);
        buttonMap = (Button) itemView.findViewById(R.id.buttonMap);
        buttonMap.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(context, MapsViewActivity.class);
                intent.putExtra("Latitude",studentMail.getText().toString());
                intent.putExtra("Longitude",studentCon.getText().toString());
                intent.putExtra("Address",studentAddress.getText().toString());
                context.startActivity(intent);
            }
        });
        checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
                if (isChecked) {
                    editor.putBoolean("checked", isChecked);
                    editor.commit();
                    String id = studentId.getText().toString();
                    databaseReference = FirebaseDatabase.getInstance().getReference("student");
                    String name = "Check";
                    databaseReference.child(id).child("stat").setValue(name);
                    notifyDataSetChanged();
                } else {
                    String id = studentId.getText().toString();
                    databaseReference = FirebaseDatabase.getInstance().getReference("student");
                    String name = "Not Check";
                    databaseReference.child(id).child("stat").setValue(name);
                    notifyDataSetChanged();
                }
            }
        });
    }

如何使用共享首选项将适配器中的复选框值保存？虽然我已经尝试了但仍然是错误的...如果我选中了复选框，我希望在我退出并打开应用程序时仍然会选中该复选框，并且当取消选中该复选框时它也将执行相同操作。

Answer 1

设置

checkBox.setChecked(isChecked);

不能让它按你想要的那样工作吗？

Answer 2

On Check事件将布尔数据保存到SharedPreferences，并将列表项的 id作为键。然后将一些代码添加到ViewHolder以检查SharedPreference是否应在显示项目之前检查该项目。这样，ViewHolder可以检查CheckBox每次显示SharedPreference时是否检查了值

如何在适配器中使用共享首选项？

2 个答案: