所以我有两个课。我正在尝试使用get方法（getInputTime）将整数数据从一个类发送到另一个类。我在get方法中返回的变量具有一个值。但是，当我在另一个名为TimeActivity的类中使用get方法时，它只会返回0。
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private static final String TAG = "CustomAdapter";
private ArrayList<Integer> mWorkTW = new ArrayList<>();
private ArrayList<Integer> mWorkET = new ArrayList<>();
private ArrayList<Integer> mRestTW = new ArrayList<>();
private ArrayList<Integer> mRestET = new ArrayList<>();
private Context mContext;
private int numberOfIntervals;
public CustomAdapter() {
}
public CustomAdapter(Context context, ArrayList<Integer> mWorkTW, ArrayList<Integer> mWorkET, ArrayList<Integer> mRestTW, ArrayList<Integer> mRestET, int numberOfIntervals) {
this.mWorkTW = mWorkTW;
this.mWorkET = mWorkET;
this.mRestTW = mRestTW;
this.mRestET = mRestET;
this.mContext = context;
this.numberOfIntervals = numberOfIntervals;
//this.inputTimeIntegerWET = inputTimeIntegerWET;
Log.d(TAG, "CustomAdapter: " + numberOfIntervals);
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View customView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.time_row, viewGroup, false);
ViewHolder holder = new ViewHolder(customView, new InputTextListener());
return holder;
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder viewHolder, final int i) {
Log.d(TAG, "onBindViewHolder: called");
viewHolder.workTextView.setText(R.string.work_text_view);
viewHolder.restTextView.setText(R.string.rest_text_view);
viewHolder.workEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus)
viewHolder.workEditText.setHint("");
else
viewHolder.workEditText.setHint(mWorkET.get(viewHolder.getAdapterPosition()));
}
});
viewHolder.restEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus)
viewHolder.restEditText.setHint("");
else
viewHolder.restEditText.setHint(mRestET.get(viewHolder.getAdapterPosition()));
}
});
}
@Override
public int getItemCount() {
Log.d(TAG, "" + numberOfIntervals);
return numberOfIntervals;
}
public class ViewHolder extends RecyclerView.ViewHolder {
public InputTextListener inputTextListener;
TextView workTextView;
EditText workEditText;
TextView restTextView;
EditText restEditText;
ConstraintLayout parentLayout;
public ViewHolder(@NonNull View itemView, InputTextListener inputTextListener) {
super(itemView);
workTextView = itemView.findViewById(R.id.workTextView);
workEditText = itemView.findViewById(R.id.workEditText);
restTextView = itemView.findViewById(R.id.restTextView);
restEditText = itemView.findViewById(R.id.restEditText);
parentLayout = itemView.findViewById(R.id.parentLayout);
this.inputTextListener = inputTextListener;
workEditText.addTextChangedListener(inputTextListener);
}
}
class InputTextListener implements TextWatcher {
String inputTimeString;
int inputTime;
HashMap<String, Integer> hashMap = new HashMap<String, Integer>();
public HashMap<String, Integer> getHashMap() {
return hashMap;
}
public InputTextListener() {
}
public void setHashMap(HashMap<String, Integer> hashMap) {
this.hashMap = hashMap;
}
public int getInputTime() {
return inputTime;
}
public void setInputTime(int inputTime) {
this.inputTime= inputTime;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
try {
Log.d(TAG, "onTextChanged: I've made it to here!");
inputTimeString = s.toString().trim();
inputTime = Integer.parseInt(inputTimeString);
setInputTime(inputTime);
// hashMap.put("EDITTEXT VALUE", inputTime);
Log.d(TAG, "onTextChanged: " + inputTime);
int bla = inputTime + 2;
Log.d(TAG, "onTextChanged: " + bla);
Log.d(TAG, "onTextChanged: " + hashMap.containsKey("EDITTEXT VALUE"));
Log.d(TAG, "onTextChanged: " + hashMap.get("EDITTEXT VALUE"));
Log.d(TAG, "onTextChanged: "+ getInputTime());
//setHashMap(hashMap);
} catch (NumberFormatException NFE) {
mWorkET = null;
}
}
@Override
public void afterTextChanged(Editable s) {
}
}
}
public class TimeActivity extends AppCompatActivity {
public static final String TAG = TimeActivity.class.getSimpleName();
private int numberOfIntervals;
private ArrayList<Integer> WTV = new ArrayList<>();
private ArrayList<Integer> WET = new ArrayList<>();
private ArrayList<Integer> RTV = new ArrayList<>();
private ArrayList<Integer> RET = new ArrayList<>();
private int inputTime;
// private String yusuf = "5";
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.custom_menu, menu);
Drawable continueImageDrawable = menu.findItem(R.id.continueItem).getIcon();
continueImageDrawable.setColorFilter(Color.WHITE, PorterDuff.Mode.SRC_ATOP);
//Every non-transparent pixel will be turned into white.
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.continueItem:
CustomAdapter a = new CustomAdapter();
CustomAdapter.InputTextListener i = a.new InputTextListener();
//HashMap<String, Integer> hashMap = i.getHashMap();
//inputTime = hashMap.get("EDITTEXT VALUE");
inputTime = i.getInputTime();
// Log.d(TAG, "onOptionsItemSelected: " + hashMap.get("EDITTEXT VALUE"));
//Log.d(TAG, "onOptionsItemSelected: " + hashMap.containsKey("EDITTEXT VALUE"));
Log.d(TAG, "onOptionsItemSelected: " + inputTime);
retrieveInputTime(inputTime);
break;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_time);
Log.d(TAG, "onCreate: Started");
View timeRowLayout = findViewById(R.id.parentLayout);
Intent intent = getIntent();
numberOfIntervals = intent.getIntExtra("Interval Count", numberOfIntervals);
Log.d(TAG, "" + numberOfIntervals);
initializeViews();
}
private void retrieveInputTime(int inputTime) {
Log.d(TAG, "retrieveInputTime: " + inputTime);
Intent intent2 = new Intent(this, ClockActivity.class);
if (inputTime > 0) {
intent2.putExtra("Input Time", inputTime);
startActivity(intent2);
Log.d(TAG, "retrieveInputTime: The data has been retrieved" + inputTime);
} else {
Toast.makeText(this, "Must enter a whole number 2", Toast.LENGTH_SHORT).show();
}
}
private void initializeViews() {
Log.d(TAG, "initializeViews: Preparing views");
//Make sure they can change through the R.strings
WTV.add(R.string.work_text_view);
WET.add(R.string.default_time_value);
RTV.add(R.string.rest_text_view);
RET.add(R.string.default_time_value);
initializeRecyclerView();
}
private void initializeRecyclerView() {
Log.d(TAG, "initializeRecyclerView: Initialize RecyclerView");
RecyclerView intervalRecyclerView = findViewById(R.id.intervalRecyclerView);
CustomAdapter adapter = new CustomAdapter(this, WTV, WET, RTV, RET, numberOfIntervals);
intervalRecyclerView.setAdapter(adapter);
intervalRecyclerView.setLayoutManager(new LinearLayoutManager(this));
}
}
我希望getInputTime方法在TimeActivity类内返回正确的值
答案 0 :(得分：0)
我看到您在两个地方使用了getInputTime（）：
答案 1 :(得分：0)
您在onOptionsItemSelected中引用的CustomAdapater实例与您要在onCreate中为recyclerView初始化的实例不同。
外观：
CustomAdapter a = new CustomAdapter();
CustomAdapter.InputTextListener i = a.new InputTextListener();
inputTime = i.getInputTime();
您正在创建CustomAdapter的新实例，然后创建InputTextListener的新实例（到目前为止这些对象之间的零连接），对该对象调用getInputTime()显然将返回0，因为它是java中int的默认值。
无论如何，我看不出在您的代码中使用recyclerView的意义。
答案 2 :(得分：0)
首先，我要感谢所有人为帮助解决问题而付出的努力，但我终于解决了。解决方案是使InputTextListener类内的inputTime变量静态。但是由于它是一个内部类，所以我必须将InputTextListener类设为自己的类。如果您有任何想法或疑问，请在下面留言。