Android 输入法如何获取EditText的inputType

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

Android 输入法如何获取EditText的inputType

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