希望大家在这段时间里都能过得好。我在编程方面是个小菜鸟。所以，我有2个EditText字段，我想从中提取文本。我知道我可以调用视图上的getText()，并将其设置为TextView，但我有一个按钮，可以在其下面添加更多的EditText字段，我希望当用户点击生成时，文本应该从所有字段中提取，并以特定格式显示在一个TextView中。
如果你能帮我用TextWatcher实现同样的功能，我将非常感激，这样用户就不需要点击生成。
附上代码供参考。
public class BookActivity extends AppCompatActivity {
static final String citationType = "Citation Type:";
TextView authorFirstTv;
int baseOfAuthor = 1;
LinearLayout authorContainerEt;
Button addButton;
Button removeButton;
EditText authorFirstEt;
EditText authorLastEt;
TextView citationHeaderTv;
Button generateButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_book);
Intent citationIntent = getIntent();
String citation = citationIntent.getStringExtra("citation");
final String citationView = citationType + "\u0020" + citation;
TextView citationTextView = findViewById(R.id.citation_header_book_tv);
citationTextView.setText(citationView);
authorFirstEt = findViewById(R.id.book_author_first_tv);
authorLastEt = findViewById(R.id.book_author_last_tv);
citationHeaderTv = findViewById(R.id.book_header_tv);
generateButton = findViewById(R.id.generate_button);
authorContainerEt = findViewById(R.id.book_author_container_ll);
generateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
generateCitation();
}
});
// Add button functionality
addButton = findViewById(R.id.book_add_button);
addButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addAuthor();
String text = Integer.toString(baseOfAuthor);
Toast.makeText(BookActivity.this, text, Toast.LENGTH_SHORT).show();
}
});
// Remove button functionality
removeButton = findViewById(R.id.book_remove_button);
removeButton.setEnabled(false);
removeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (baseOfAuthor >= 2) {
removeButton.setEnabled(true);
removeAuthor();
String text = Integer.toString(baseOfAuthor);
Toast.makeText(BookActivity.this, text, Toast.LENGTH_SHORT).show();
} else {
removeButton.setEnabled(false);
Toast.makeText(BookActivity.this, "Can't remove default author", Toast.LENGTH_SHORT).show();
}
}
});
// For APA
TextView publisherCityAPA = findViewById(R.id.book_city_apa_tv);
TextView publisherStateAPA = findViewById(R.id.book_state_apa_tv);
publisherCityAPA.setVisibility(View.GONE);
publisherStateAPA.setVisibility(View.GONE);
// For Harvard
TextView bookVolumeTv = findViewById(R.id.book_volume_tv);
TextView pagesTv = findViewById(R.id.book_pages_tv);
if (citation.equals("APA")) {
publisherCityAPA.setVisibility(View.VISIBLE);
publisherStateAPA.setVisibility(View.VISIBLE);
}
if (citation.equals("Harvard")) {
publisherStateAPA.setVisibility(View.GONE);
bookVolumeTv.setVisibility(View.GONE);
pagesTv.setVisibility(View.GONE);
}
}
/**
* Method to add a new author field to the list keeping the color coding and dimensions as
* close as possible.
*/
public void addAuthor() {
authorFirstEt = new EditText(getApplicationContext());
authorLastEt = new EditText(getApplicationContext());
baseOfAuthor += 1;
authorContainerEt.addView(authorFirstEt, baseOfAuthor);
baseOfAuthor += 1;
authorContainerEt.addView(authorLastEt, baseOfAuthor);
authorFirstEt.setHint("First Name");
authorLastEt.setHint("Last Name");
// To set the dimensions of the EditText and refresh the layout
authorFirstEt.setWidth(200);
authorLastEt.setWidth(200);
authorFirstEt.setInputType(InputType.TYPE_TEXT_VARIATION_PERSON_NAME);
authorLastEt.setInputType(InputType.TYPE_TEXT_VARIATION_PERSON_NAME);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams
(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(8, 8, 8, 8);
authorFirstEt.setLayoutParams(layoutParams);
authorLastEt.setLayoutParams(layoutParams);
authorFirstEt.getLayoutParams().width = 305;
authorLastEt.getLayoutParams().width = 305;
authorFirstEt.requestLayout();
authorLastEt.requestLayout();
// To set the color of the EditText field
authorFirstEt.setTextColor(ContextCompat.getColor(BookActivity.this, R.color.colorBackground));
authorFirstEt.setHintTextColor(ContextCompat.getColor(BookActivity.this, R.color.editTextColorHint));
ColorStateList colorStateList = ColorStateList.valueOf(getResources().getColor(R.color.colorBackground));
ViewCompat.setBackgroundTintList(authorFirstEt, colorStateList);
removeButton.setEnabled(true);
authorLastEt.setTextColor(ContextCompat.getColor(BookActivity.this, R.color.colorBackground));
authorLastEt.setHintTextColor(ContextCompat.getColor(BookActivity.this, R.color.editTextColorHint));
ColorStateList lastColorStateList = ColorStateList.valueOf(getResources().getColor(R.color.colorBackground));
ViewCompat.setBackgroundTintList(authorLastEt, lastColorStateList);
removeButton.setEnabled(true);
}
/**
* Method to remove the author from the list
*/
public void removeAuthor() {
authorContainerEt.removeViewAt(baseOfAuthor);
baseOfAuthor -= 1;
authorContainerEt.removeViewAt(baseOfAuthor);
baseOfAuthor -= 1;
}
public void generateCitation() {
EditText test1 = (EditText) authorContainerEt.getChildAt(0);
String authorFirst = test1.getText().toString();
String authorLast = authorLastEt.getText().toString();
String generatedAuthor = authorLast + ",\u0020" + authorFirst + ".\u0020";
if (baseOfAuthor > 1) {
for (int i = authorContainerEt.getChildCount(); i < 2; i = i - 2) {
EditText currentAuthorLast = (EditText) authorContainerEt.getChildAt(i - 1);
String extraAuthorLast = currentAuthorLast.getText().toString();
EditText currentAuthorFirst = (EditText) authorContainerEt.getChildAt(i - 2);
String extraAuthorFirst = currentAuthorFirst.getText().toString();
generatedAuthor = generatedAuthor + "and\u0020" + extraAuthorFirst + "\u0020" + extraAuthorLast;
}
}
String generatedCitation = generatedAuthor;
citationHeaderTv.setText(generatedCitation);
}
/**
*Inner class to implement TextWatcher on EditText View
*/
// private class GenericTextWatcher implements TextWatcher{
//
// private View view;
// private GenericTextWatcher(View view) {
// this.view = view;
// }
//
// public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}
// public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
// String text = charSequence.toString();
// String finalText = null;
// switch(view.getId()){
// case R.id.book_author_first_tv:
// finalText = text + ", ";
//// citationHeaderTv.setText(finalText);
// break;
// case R.id.book_author_last_tv:
// finalText = text + ". ";
//// citationHeaderTv.setText(finalText);
// break;
//
//// case R.id.phone:
//// model.setPhone(text);
//// break;
// }
// citationHeaderTv.setText(finalText);
// }
//
// public void afterTextChanged(Editable editable) {
// }
// }
}
制作一个 ArrayList 的 EditText 或者类似的东西，你可以只添加你的新的EditTexts，并通过列表循环来获取生成功能的值？