Android 输入法如何获取EditText的inputTyp

inputType属性的作用在于给输入法足够的上下文
Properly set the {@link android.R.attr#inputType} in your editable
text views, so that the input method will have enough context to help the
user in entering text into them.

android.widget.TextView.java
public TextView(
Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
if (mEditor != null) {
//实际是mEditor
mEditor.adjustInputType(password, passwordInputType, webPasswordInputType,
numberPasswordInputType);
}
}

android.widget.Editor.java
Helper class used by TextView to handle editable text views.

InputContentType mInputContentType;

静态内部类
static class InputContentType {
int imeOptions = EditorInfo.IME_NULL;
String privateImeOptions;
CharSequence imeActionLabel;
int imeActionId;
Bundle extras;
OnEditorActionListener onEditorActionListener;
boolean enterDown;
LocaleList imeHintLocales;
}

android.view.inputmethod.EditorInfo.java
public class EditorInfo implements InputType, Parcelable {

/**
 * The content type of the text box, whose bits are defined by
 * {@link InputType}.
 *
 * @see InputType
 * @see #TYPE_MASK_CLASS
 * @see #TYPE_MASK_VARIATION
 * @see #TYPE_MASK_FLAGS
 */
public int inputType = TYPE_NULL;

}

android.text.InputType.java

/**

• Masks for {@link inputType}
• <pre>
• |-------|-------|-------|-------|

•                          1111 TYPE_MASK_CLASS
  

•                  11111111     TYPE_MASK_VARIATION
  

•      111111111111             TYPE_MASK_FLAGS
  

• |-------|-------|-------|-------|

•                               TYPE_NULL
  

• |-------|-------|-------|-------|

•                             1 TYPE_CLASS_TEXT
  

•                         1     TYPE_TEXT_VARIATION_URI
  

•                        1      TYPE_TEXT_VARIATION_EMAIL_ADDRESS
  

•                        11     TYPE_TEXT_VARIATION_EMAIL_SUBJECT
  

•                       1       TYPE_TEXT_VARIATION_SHORT_MESSAGE
  

•                       1 1     TYPE_TEXT_VARIATION_LONG_MESSAGE
  

•                       11      TYPE_TEXT_VARIATION_PERSON_NAME
  

•                       111     TYPE_TEXT_VARIATION_POSTAL_ADDRESS
  

•                      1        TYPE_TEXT_VARIATION_PASSWORD
  

•                      1  1     TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
  

•                      1 1      TYPE_TEXT_VARIATION_WEB_EDIT_TEXT
  

•                      1 11     TYPE_TEXT_VARIATION_FILTER
  

•                      11       TYPE_TEXT_VARIATION_PHONETIC
  

•                      11 1     TYPE_TEXT_VARIATION_WEB_EMAIL_ADDRESS
  

•                      111      TYPE_TEXT_VARIATION_WEB_PASSWORD
  

•                 1             TYPE_TEXT_FLAG_CAP_CHARACTERS
  

•                1              TYPE_TEXT_FLAG_CAP_WORDS
  

•               1               TYPE_TEXT_FLAG_CAP_SENTENCES
  

•              1                TYPE_TEXT_FLAG_AUTO_CORRECT
  

•             1                 TYPE_TEXT_FLAG_AUTO_COMPLETE
  

•            1                  TYPE_TEXT_FLAG_MULTI_LINE
  

•           1                   TYPE_TEXT_FLAG_IME_MULTI_LINE
  

•          1                    TYPE_TEXT_FLAG_NO_SUGGESTIONS
  

• |-------|-------|-------|-------|

•                            1  TYPE_CLASS_NUMBER
  

•                         1     TYPE_NUMBER_VARIATION_PASSWORD
  

•                 1             TYPE_NUMBER_FLAG_SIGNED
  

•                1              TYPE_NUMBER_FLAG_DECIMAL
  

• |-------|-------|-------|-------|

•                            11 TYPE_CLASS_PHONE
  

• |-------|-------|-------|-------|

•                           1   TYPE_CLASS_DATETIME
  

•                         1     TYPE_DATETIME_VARIATION_DATE
  

•                        1      TYPE_DATETIME_VARIATION_TIME
  

• |-------|-------|-------|-------|</pre>
  */

/**

• Mask of bits that determine the overall class
• of text being given. Currently supported classes are:
• {@link #TYPE_CLASS_TEXT}, {@link #TYPE_CLASS_NUMBER},
• {@link #TYPE_CLASS_PHONE}, {@link #TYPE_CLASS_DATETIME}.
• <p>IME authors: If the class is not one you
• understand, assume {@link #TYPE_CLASS_TEXT} with NO variation
• or flags.<p>
  */
  public static final int TYPE_MASK_CLASS = 0x0000000f;

/**

• Mask of bits that determine the variation of
• the base content class.
  */
  public static final int TYPE_MASK_VARIATION = 0x00000ff0;

/**

• Mask of bits that provide addition bit flags
• of options.
  */
  public static final int TYPE_MASK_FLAGS = 0x00fff000;

android.inputmethodservice.InputMethodService.java

/**

• {@inheritDoc}
  */
  @MainThread
  @Override
  public void startInput(InputConnection ic, EditorInfo attribute) {
  if (DEBUG) Log.v(TAG, "startInput(): editor=" + attribute);
  doStartInput(ic, attribute, false);
  }

/**

• {@inheritDoc}
  */
  @MainThread
  @Override
  public void restartInput(InputConnection ic, EditorInfo attribute) {
  if (DEBUG) Log.v(TAG, "restartInput(): editor=" + attribute);
  doStartInput(ic, attribute, true);
  }

void doStartInput(InputConnection ic, EditorInfo attribute, boolean restarting) {
if (!restarting) {
doFinishInput();
}
mInputStarted = true;
mStartedInputConnection = ic;
mInputEditorInfo = attribute;
initialize();
if (DEBUG) Log.v(TAG, "CALL: onStartInput");
onStartInput(attribute, restarting);
if (mWindowVisible) {
if (mShowInputRequested) {
if (DEBUG) Log.v(TAG, "CALL: onStartInputView");
mInputViewStarted = true;
onStartInputView(mInputEditorInfo, restarting);
startExtractingText(true);
} else if (mCandidatesVisibility == View.VISIBLE) {
if (DEBUG) Log.v(TAG, "CALL: onStartCandidatesView");
mCandidatesViewStarted = true;
onStartCandidatesView(mInputEditorInfo, restarting);
}
}
}

/**

• Called to inform the input method that text input has started in an
• editor. You should use this callback to initialize the state of your
• input to match the state of the editor given to it.
• @param attribute The attributes of the editor that input is starting
• in.
• @param restarting Set to true if input is restarting in the same
• editor such as because the application has changed the text in
• the editor. Otherwise will be false, indicating this is a new
• session with the editor.
  */
  public void onStartInput(EditorInfo attribute, boolean restarting) {
  // Intentionally empty
  }
  到onStartInput这里，输入法就可以从EditorInfo拿到inputType的值了