我有一个使用列表的RecyclerViewer。在列表中有复选框。如果用户按下复选框，则更新后的列表将保存在sharedPreferences中。当我返回该活动时，仍会选中这些框，但是当我选择新的复选框时，只会传递新选中的框。如果我也希望保存旧复选框，则必须取消选中并重新选中它们。知道为什么吗？
下面是代码。
public class InterestActivity extends AppCompatActivity {
private static final String TAG = "InterestActivity";
SharedPreferences prefs;
SharedPreferences.Editor mEditor;
String key = "Key";
//const
private static final int VERIFY_PERMISSIONS_REQUEST = 1;
//location
private FusedLocationProviderClient fusedLocationClient;
//Firebase
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private FirebaseDatabase mFirebaseDatabase;
private DatabaseReference mRef;
private FirebaseMethods mFirebaseMethods;
private String userID;
private Context mContext;
List<Interest> lstInterest;
StringBuffer interestList = null;
//RecyclerViewAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.interest);
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
mContext = InterestActivity.this;
if (checkPermissionArray(Permissions.PERMISSIONS)) {
} else {
verifyPermissions(Permissions.PERMISSIONS);
}
//Firebase
setupFirebaseAuth();
//adapter = new RecyclerViewAdapter(this, lstInterest);
lstInterest = new ArrayList<>();
lstInterest.add(new Interest("BMX", R.drawable.bmx_tn, false));
lstInterest.add(new Interest("Bowling", R.drawable.bowling_tn, false));
lstInterest.add(new Interest("Camping", R.drawable.camping_tn, false));
lstInterest.add(new Interest("Dance", R.drawable.dance_tn, false));
lstInterest.add(new Interest("Fishing", R.drawable.fishing_tn, false));
lstInterest.add(new Interest("Frisbee Golf", R.drawable.frisbeegolf_tn, false));
lstInterest.add(new Interest("Golfing", R.drawable.golfing_tn, false));
lstInterest.add(new Interest("Hunting", R.drawable.hunting_tn, false));
lstInterest.add(new Interest("Kayaking", R.drawable.kayaking_tn, false));
lstInterest.add(new Interest("Mountain Biking", R.drawable.mountainbiking_tn, false));
lstInterest.add(new Interest("Programming", R.drawable.programming_tn, false));
lstInterest.add(new Interest("Rock Climbing", R.drawable.rockclimbing_tn, false));
lstInterest.add(new Interest("Skateboarding", R.drawable.skateboarding_tn, false));
lstInterest.add(new Interest("Slack Line", R.drawable.slackline_tn, false));
lstInterest.add(new Interest("Video Games", R.drawable.videogames_tn, false));
lstInterest.add(new Interest("Yoga", R.drawable.yoga_tn, false));
loadData();
RecyclerView interestRv = (RecyclerView) findViewById(R.id.interest_recyclerview_id);
final RecyclerViewAdapter interestAdapter = new RecyclerViewAdapter(this, lstInterest);
interestRv.setLayoutManager(new GridLayoutManager(this, 2));
interestRv.setAdapter(interestAdapter);
Button btnButton = (Button) findViewById(R.id.btnInterestSave);
btnButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
interestList = new StringBuffer();
for (Interest i : interestAdapter.checkedInterest) {
interestList.append(i.getTitle());
interestList.append(",");
saveData();
Log.d(TAG, "onClick: interest adapter " + interestAdapter.checkedInterest);
}
if (interestAdapter.checkedInterest.size() > 0) {
Toast.makeText(InterestActivity.this, interestList.toString(), Toast.LENGTH_SHORT).show();
addUserInterest(interestList.toString());
}
Intent intent = new Intent(InterestActivity.this, MainActivity.class);
startActivity(intent);
//getUserLocation();
}
});
}
private void saveData() {
SharedPreferences sharedPreferences = getSharedPreferences("shared preference", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
Gson gson = new Gson();
String json = gson.toJson(lstInterest);
editor.putString("task list", json);
editor.apply();
}
private void loadData() {
SharedPreferences sharedPreferences = getSharedPreferences("shared preference", MODE_PRIVATE);
Gson gson = new Gson();
String json = sharedPreferences.getString("task list", null);
Type type = new TypeToken<List<Interest>>() {
}.getType();
lstInterest = gson.fromJson(json, type);
}
/*
`````````````````````````````````````firebase```````````````````````````````````````````````
*/
//Send data to firebase interest DB.
private void addUserInterest(String interest) {
Log.d(TAG, "addUserInterest: use to save interest to database user_interest_post");
mRef.child(mContext.getString(R.string.dbname_user_interest_post))
.child(userID)
.child(mContext.getString(R.string.string_interest))
.setValue(interest);
mRef.child("user_profile_post")
.child(userID)
.child("interest")
.setValue(interest);
}
下面是我从recyclerViewer获取检查状态的地方。我相信问题就在这里。
holder.setItemClickListener(new ItemClickListener(){
@Override
public void onItemClick(View v, int pos){
CheckBox chk = (CheckBox) v;
if (chk.isChecked()) {
checkedInterest.add(mData.get(pos));
Log.d(TAG, "onItemClick: checked state 1 " + checkedInterest);
}else if(!chk.isChecked()){
checkedInterest.remove(mData.get(pos));
Log.d(TAG, "onItemClick: checked state 2 " + checkedInterest);
}
//Integer pos = (int) holder.chk.getTag();
//Toast.makeText(mContext, mData.get(position).getTitle() + " Clicked!", Toast.LENGTH_SHORT).show();
if (mData.get(pos).isSelected()) {
mData.get(pos).setSelected(false);
} else {
mData.get(pos).setSelected(true);
}
}
} );
答案 0 :(得分：0)
创建布尔值：
已检查私有布尔值= false;
然后将侦听器添加到您的复选框：
chk.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (buttonView.isChecked()){
Log.d(TAG, "button is checked!");
checked = true; //Change boolean value 'True" because it's checked!
}else {
Log.d(TAG, "button is not checked!");
checked = false; //Change boolean value 'False' because it's unchecked!
}
}
});
现在，您可以通过以下方式检查您的复选框是否已选中：
if(checked){
//condition true
}else{
//condition false
}
如果您也想将复选框状态保存在SharedPreferences中，只需在您的SharedPref中输入 Boolean 值“ checked ”。