TextWatcher正常工作，直到我的活动被销毁，并且从旧保存的包中恢复之前。但是当我从保存的包onTextChanged()恢复时，我的两个EditTexts都会被调用。即使我没有恢复它们的值（不要调用setText（）），也会发生这种情况。请注意，用户没有以任何方式进行交互。
代码：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.create_trip);
Log.d(TAG, "onCreate");
fromLocation = (EditText) findViewById(R.id.from_location);
toLocation = (EditText) findViewById(R.id.to_location);
// Set EditTexts listeners
setFromLocationEditTextListeres();
setToLocationEditTextListeres();
// Check whether we're recreating a previously destroyed instance
if (savedInstanceState != null) {
Log.d(TAG, "Restoring state from saved bundle");
...
} else {
Log.e(TAG, "Setting default values");
...
}
}
// Set listener for fromLocation EditText
private void setFromLocationEditTextListeres() {
fromLocation.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
Log.d(TAG, "fromLocation gained focus.");
}
}
});
fromLocation.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
Log.e(TAG, "Fromlocation after.");
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
if (fromLocation == null) {
Log.d(TAG, "fromLocation is null................");
}
if (count != before) {
editTextValueChanged(fromLocation);
}
}
});
fromLocation.setOnKeyListener(new View.OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
// If user pressed enter
if (keyCode == KeyEvent.KEYCODE_ENTER) {
}
// If pressed other than enter key then let others handle the
// event
return false;
}
});
}
// Set listener for toLocation EditText
private void setToLocationEditTextListeres() {
toLocation.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
Log.d(TAG, "toLocation gained focus.");
}
}
});
toLocation.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
Log.e(TAG, "Tolocation after.");
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
if (count != before) {
editTextValueChanged(toLocation);
}
}
});
toLocation.setOnKeyListener(new View.OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
// If user pressed enter
if (keyCode == KeyEvent.KEYCODE_ENTER) {
}
// If pressed other than enter key then let others handle the
// event
return false;
}
});
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
Log.e(TAG, "onSaveInstanceState called.");
// Save activity state
savedInstanceState.putCharSequence(FROM_LOCATION_TEXT,
fromLocation.getText());
savedInstanceState.putCharSequence(TO_LOCATION_TEXT,
toLocation.getText());
super.onSaveInstanceState(savedInstanceState);
}
答案 0 :(得分：2)
在几个小时的头痛之后，问题的原因出现在我的以下代码中：
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
Log.e(TAG, "onSaveInstanceState called.");
// Save activity state
savedInstanceState.putCharSequence(FROM_LOCATION_TEXT,
fromLocation.getText());
savedInstanceState.putCharSequence(TO_LOCATION_TEXT,
toLocation.getText());
super.onSaveInstanceState(savedInstanceState);
}
Android本身存储我的EditText状态（如果布局文件中指定了id属性），并且使用保存的包恢复活动时，它会恢复EditText＆＃39; s通过调用myEditText.setText()来获取价值。这是触发对文本更改的侦听器的调用。
解决方案是从上面的代码中删除行，以保存EditText的文本。请勿明确保存EditText或类似View的状态。让android为你做。
答案 1 :(得分：0)
答案是，您首先@Override onTextChanged() fromLocation.addTextChangedListener @Override，然后再toLocation.addTextChangedListener onCreate内if (savedInstanceState != null) {。然后在 fromLocation.setText(savedInstanceState
.getCharSequence(FROM_LOCATION_TEXT));
toLocation.setText(savedInstanceState
.getCharSequence(TO_LOCATION_TEXT));
内addTextChangedListener你有：
onCreate这两个触发都提到了if s。
编辑（更新问题后）：
在// Set EditTexts listeners
setFromLocationEditTextListeres();
setToLocationEditTextListeres();
中，您在任何Log.e(TAG, "onSaveInstanceState called.");
// Save activity state
savedInstanceState.putCharSequence(FROM_LOCATION_TEXT,
fromLocation.getText());
savedInstanceState.putCharSequence(TO_LOCATION_TEXT,
toLocation.getText());
super.onSaveInstanceState(savedInstanceState);
语句之前调用此内容：
onCreate然后你有：
@覆盖 public void onSaveInstanceState（Bundle savedInstanceState）{
EditTexts}
因此，您要从上面的EditTexts中恢复文本，然后在onTextChanged中设置监听器 - 从而设置EditTexts上的文本会触发onCreate在if (savedInstanceState != null) {
Log.d(TAG, "Restoring state from saved bundle");
// Restore value of members from saved state
.../*Intentionnaly missed part*/
fromLocation.setText(savedInstanceState
.getCharSequence(FROM_LOCATION_TEXT)); <- Here you set the text again and trigger the `onTextChanged`
.../*Intentionnaly missed part*/
toLocation.setText(savedInstanceState
.getCharSequence(TO_LOCATION_TEXT)); <- Here you set the text again and trigger the `onTextChanged
} else {
Log.e(TAG, "Setting default values");
.../*Intentionnaly missed part*/
fromLocation.setText("Hello");<- Here you set the text again and trigger the `onTextChanged
}
之后。然后使用fromLocation方法：
EditText我认为所描述的行为（例如“TextWatcher在我的活动被销毁之前以及从旧保存的包中恢复之前正常工作。但是当我从保存的包中恢复onTextChanged（）时，我的两个EditTexts都会被调用。即使我没有恢复它们的值（不要调用setText（））。注意用户没有以任何方式进行交互。“）仅在fromLocation（toLocation）的情况下发生，而不是两种情况（例如editTextGainedFocus(EditText)和{{1}}）。
要完成这个 - 你还有很多很多标志，我甚至不知道它们用于什么。还要强调此处未描述的函数{{1}}。
干杯。