下面列出了android.view.KeyEvent#KEYCODE_A 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(handleKeyboardFocusEvent(keyCode)) return true;
if (Environment.needDebug) {
Environment.debug(TAG, "keydown-event:" + keyCode);
}
//同步软键盘状态处理代码：不处理以下按键事件则有可能物理键盘字符输入与软键盘的大小写状态不同步
if(keyCode == KeyEvent.KEYCODE_CAPS_LOCK) capsOn = !capsOn;
if ((keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9)) {
if(commitText(String.valueOf(keyCode - KeyEvent.KEYCODE_0))) return true;
} else if (keyCode >= KeyEvent.KEYCODE_A && keyCode <= KeyEvent.KEYCODE_Z) {
if (commitText(String.valueOf((char) ((capsOn ? 65 : 97) + keyCode - KeyEvent.KEYCODE_A))))
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onKeyShortcut(int keyCode, KeyEvent event) {
final int filteredMetaState = event.getMetaState() & ~KeyEvent.META_CTRL_MASK;
if (KeyEvent.metaStateHasNoModifiers(filteredMetaState)) {
switch (keyCode) {
case KeyEvent.KEYCODE_A:
selectAll();
return true;
case KeyEvent.KEYCODE_X:
cut();
return true;
case KeyEvent.KEYCODE_C:
copy();
return true;
case KeyEvent.KEYCODE_V:
paste();
return true;
}
}
return super.onKeyShortcut(keyCode, event);
}
/**
* Tests that the callback will retrieve the expected values.
* @throws IOException
*/
@Test
public void testCallbackKeyDown() throws IOException {
final int[] index = {0};
final int[] testKeys = new int[] {KeyEvent.KEYCODE_A, KeyEvent.KEYCODE_NUMPAD_1,
KeyEvent.KEYCODE_PERIOD};
mMatrixKeypad = new MatrixKeypad(mRowPins, mColPins, mKeyCodes,
PowerMockito.mock(Handler.class));
mMatrixKeypad.setKeyCallback(new OnKeyEventListener() {
@Override
public void onKeyEvent(MatrixKey matrixKey) {
assertEquals(testKeys[index[0]++], matrixKey.getKeyCode());
assertTrue(matrixKey.isPressed());
}
});
for (int key : testKeys) {
mMatrixKeypad.keyDown(key);
}
}
/**
* Method to start tracking processing latency for a key event.
*
* @param event A key event just received by TalkBack
* @return An event id that can be used to track performance through later stages.
*/
public EventId onEventReceived(@NonNull KeyEvent event) {
int keycode = event.getKeyCode();
EventId eventId = new EventId(event.getEventTime(), EVENT_TYPE_KEY, keycode);
if (!mEnabled) {
return eventId;
}
// Segment key events based on key groups.
String label = "KeyEvent-other";
if (KeyEvent.KEYCODE_0 <= keycode && keycode <= KeyEvent.KEYCODE_9) {
label = "KeyEvent-numeric";
} else if (KeyEvent.KEYCODE_A <= keycode && keycode <= KeyEvent.KEYCODE_Z) {
label = "KeyEvent-alpha";
} else if (KeyEvent.KEYCODE_DPAD_UP <= keycode && keycode <= KeyEvent.KEYCODE_DPAD_CENTER) {
label = "KeyEvent-dpad";
} else if (KeyEvent.KEYCODE_VOLUME_UP <= keycode && keycode <= KeyEvent.KEYCODE_VOLUME_DOWN) {
label = "KeyEvent-volume";
}
String[] labels = {label};
onEventReceived(eventId, labels);
return eventId;
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (DLog.DEBUG) {
Log.w(TAG, "onKeyUp " + event);
}
if (handleControlKey(keyCode, event, false)) {
return true;
}
if (event.isCtrlPressed() || mKeyListener.mControlKey.isActive()) {
switch (keyCode) {
case KeyEvent.KEYCODE_A:
case KeyEvent.KEYCODE_X:
case KeyEvent.KEYCODE_C:
case KeyEvent.KEYCODE_V:
case KeyEvent.KEYCODE_Z:
case KeyEvent.KEYCODE_Y:
case KeyEvent.KEYCODE_S:
case KeyEvent.KEYCODE_R:
case KeyEvent.KEYCODE_F:
case KeyEvent.KEYCODE_L:
return true;
}
} else {
switch (keyCode) {
case KeyEvent.KEYCODE_TAB:
return true;
}
}
return super.onKeyUp(keyCode, event);
}
@Override
public boolean onKeyShortcut(int keyCode, KeyEvent event) {
if (event.hasModifiers(KeyEvent.META_CTRL_ON)) {
switch (keyCode) {
case KeyEvent.KEYCODE_A:
if (mState == State.WORKSPACE) {
showAppsView(true, false);
return true;
}
break;
case KeyEvent.KEYCODE_S: {
View focusedView = getCurrentFocus();
if (focusedView instanceof BubbleTextView
&& focusedView.getTag() instanceof ItemInfo
&& mAccessibilityDelegate.performAction(focusedView,
(ItemInfo) focusedView.getTag(),
LauncherAccessibilityDelegate.DEEP_SHORTCUTS)) {
PopupContainerWithArrow.getOpen(this).requestFocus();
return true;
}
break;
}
case KeyEvent.KEYCODE_O:
if (new CustomActionsPopup(this, getCurrentFocus()).show()) {
return true;
}
break;
}
}
return super.onKeyShortcut(keyCode, event);
}
/**
* Handles common input shortcut from an EditText.
*
* @param activity The activity to reference for copying and pasting.
* @param editText The EditText where the text is being copied/pasted.
* @param keyCode Keycode to handle.
*
* @return True if key is handled.
*/
public static boolean handleInputShortcut(AppCompatActivity activity, EditText editText, int keyCode) {
// Get selected text for cut and copy.
int start = editText.getSelectionStart();
int end = editText.getSelectionEnd();
final String text = editText.getText().toString().substring(start, end);
switch (keyCode) {
case KeyEvent.KEYCODE_A:
editText.selectAll();
return true;
case KeyEvent.KEYCODE_X:
editText.setText(editText.getText().toString().replace(text, ""));
return true;
case KeyEvent.KEYCODE_C:
ActivityServiceUtils.copyToClipboard(activity, text);
return true;
case KeyEvent.KEYCODE_V:
editText.setText(
editText.getText().replace(Math.min(start, end), Math.max(start, end),
ActivityServiceUtils.pasteFromClipboard(activity), 0,
ActivityServiceUtils.pasteFromClipboard(activity).length()));
return true;
default:
// Do nothing.
return false;
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_A) { //29
if (!mKeyPressed) {
mKeyPressed = true;
mResetHandler.postDelayed(mDisconnectRunnable, DISCONNECT_DELAY);
mResetHandler.postDelayed(mResetRunnable, RESET_DELAY);
}
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_A) {
submitForm();
}
return super.onKeyDown(keyCode, event);
}
/**
* Handles common input shortcut from an EditText.
*
* @param activity The activity to reference for copying and pasting.
* @param editText The EditText where the text is being copied/pasted.
* @param keyCode Keycode to handle.
*
* @return True if key is handled.
*/
public static boolean handleInputShortcut(AppCompatActivity activity, EditText editText, int keyCode) {
// Get selected text for cut and copy.
int start = editText.getSelectionStart();
int end = editText.getSelectionEnd();
final String text = editText.getText().toString().substring(start, end);
switch (keyCode) {
case KeyEvent.KEYCODE_A:
editText.selectAll();
return true;
case KeyEvent.KEYCODE_X:
editText.setText(editText.getText().toString().replace(text, ""));
return true;
case KeyEvent.KEYCODE_C:
ActivityServiceUtils.copyToClipboard(activity, text);
return true;
case KeyEvent.KEYCODE_V:
editText.setText(
editText.getText().replace(Math.min(start, end), Math.max(start, end),
ActivityServiceUtils.pasteFromClipboard(activity), 0,
ActivityServiceUtils.pasteFromClipboard(activity).length()));
return true;
default:
// Do nothing.
return false;
}
}
static public int keyCode2Direction(int keyCode) {
/* interprets a keyCode as a direction
* input: keyCode - a key code passed to handler
* output: [0 1 2 3] -> [left down up right]; -1 -> unknown
*/
switch (keyCode) {
// WASD, ZX-NM spread, AS-KL spread
// 12-90 spread, D-Pad
// Headphone music controller
case KeyEvent.KEYCODE_A: case KeyEvent.KEYCODE_Z:
case KeyEvent.KEYCODE_1: case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_MEDIA_PREVIOUS: case KeyEvent.KEYCODE_MEDIA_REWIND:
case KeyEvent.KEYCODE_BUTTON_X:
return 0;
case KeyEvent.KEYCODE_S: case KeyEvent.KEYCODE_X:
case KeyEvent.KEYCODE_2: case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_MEDIA_STOP:
case KeyEvent.KEYCODE_BUTTON_A:
return 1;
case KeyEvent.KEYCODE_W: case KeyEvent.KEYCODE_N: case KeyEvent.KEYCODE_K:
case KeyEvent.KEYCODE_9: case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
case KeyEvent.KEYCODE_BUTTON_Y:
return 2;
case KeyEvent.KEYCODE_D: case KeyEvent.KEYCODE_M: case KeyEvent.KEYCODE_L:
case KeyEvent.KEYCODE_0: case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_MEDIA_NEXT: case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
case KeyEvent.KEYCODE_BUTTON_B:
return 3;
default:
return -1;
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_A) {
mDisplayMode = DisplayMode.PRESSURE;
updateDisplay(mLastPressure);
try {
mLed.setValue(true);
} catch (IOException e) {
Log.e(TAG, "error updating LED", e);
}
return true;
}
return super.onKeyUp(keyCode, event);
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_A) {
mDisplayMode = DisplayMode.TEMPERATURE;
updateDisplay(mLastTemperature);
try {
mLed.setValue(false);
} catch (IOException e) {
Log.e(TAG, "error updating LED", e);
}
return true;
}
return super.onKeyUp(keyCode, event);
}
private char getInputCode(KeyEvent event) {
int keyCode = event.getKeyCode();
char aChar;
if (keyCode >= KeyEvent.KEYCODE_A && keyCode <= KeyEvent.KEYCODE_Z) {
//字母
aChar = (char) ((mCaps ? 'A' : 'a') + keyCode - KeyEvent.KEYCODE_A);
} else if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9) {
//数字
aChar = (char) ('0' + keyCode - KeyEvent.KEYCODE_0);
} else {
//其他符号
switch (keyCode) {
case KeyEvent.KEYCODE_PERIOD:
aChar = '.';
break;
case KeyEvent.KEYCODE_MINUS:
aChar = mCaps ? '_' : '-';
break;
case KeyEvent.KEYCODE_SLASH:
aChar = '/';
break;
case KeyEvent.KEYCODE_BACKSLASH:
aChar = mCaps ? '|' : '\\';
break;
default:
aChar = 0;
break;
}
}
return aChar;
}
/**
* 快捷方式
*
* @param ctrl
* @param alt
* @param shift
* @param keyCode
*/
protected boolean onShortKey(boolean ctrl, boolean alt, boolean shift, int keyCode) {
if (ctrl) {
if (keyCode == KeyEvent.KEYCODE_A) {
selectModel.select(0, length());
postInvalidate();
return true;
}
if (keyCode == KeyEvent.KEYCODE_C) {
if (selectModel.hasSelect()) {
try {
copy();
} catch (Exception e) {
}
return true;
}
}
if (keyCode == KeyEvent.KEYCODE_X) {
if (selectModel.hasSelect()) {
cut();
return true;
}
}
if (keyCode == KeyEvent.KEYCODE_Z) {
undo();
return true;
}
if (keyCode == KeyEvent.KEYCODE_Y) {
redo();
return true;
}
}
if (shift) {
try {
if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
if (!selectModel.hasSelect()) {
selectModel.start(cursorPos);
}
selectModel.toLeft(1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
if (!selectModel.hasSelect()) {
selectModel.start(cursorPos);
}
selectModel.toRight(1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
if (!selectModel.hasSelect()) {
selectModel.start(cursorPos);
}
selectModel.toUp(1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
if (!selectModel.hasSelect()) {
selectModel.start(cursorPos);
}
selectModel.toDown(1);
return true;
} else if (keyCode == KeyEvent.KEYCODE_MOVE_HOME) {
if (!selectModel.hasSelect()) {
selectModel.start(cursorPos);
}
selectModel.toHome();
return true;
} else if (keyCode == KeyEvent.KEYCODE_MOVE_END) {
if (!selectModel.hasSelect()) {
selectModel.start(cursorPos);
}
selectModel.toEnd();
return true;
}
} finally {
postInvalidate();
}
}
return false;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.isCtrlPressed()) {
switch (keyCode) {
case KeyEvent.KEYCODE_X: // CTRL+X - Cut
cut();
return true;
case KeyEvent.KEYCODE_C: // CTRL+C - Copy
copy();
return true;
case KeyEvent.KEYCODE_V: // CTRL+V - Paste
paste();
return true;
case KeyEvent.KEYCODE_Z: // CTRL+Z - Undo
undo();
return true;
case KeyEvent.KEYCODE_Y: // CTRL+Y - Redo
redo();
return true;
case KeyEvent.KEYCODE_A: // CTRL+A - Select All
selectAll();
return true;
case KeyEvent.KEYCODE_DEL: // CTRL+Delete - Delete Line
deleteLine();
return true;
case KeyEvent.KEYCODE_D: // CTRL+D - Duplicate Line
duplicateLine();
return true;
// case KeyEvent.KEYCODE_S: // CTRL+S - Save File
// codeEditor.saveFile();
// return true;
default:
return super.onKeyDown(keyCode, event);
}
} else {
switch (keyCode) {
case KeyEvent.KEYCODE_TAB: // TAB
int start, end;
start = Math.max(getSelectionStart(), 0);
end = Math.max(getSelectionEnd(), 0);
getText().replace(Math.min(start, end),
Math.max(start, end), TAB_STR, 0, TAB_STR.length());
return true;
default:
try {
return super.onKeyDown(keyCode, event);
} catch (Exception e) {
Logger.error(TAG, e);
}
return false;
}
}
}
@Override
public boolean onKeyDown(int keyCode, @NonNull KeyEvent event) {
if (event.isCtrlPressed()) {
switch (keyCode) {
case KeyEvent.KEYCODE_A:
return onTextContextMenuItem(ID_SELECT_ALL);
case KeyEvent.KEYCODE_X:
return onTextContextMenuItem(ID_CUT);
case KeyEvent.KEYCODE_C:
return onTextContextMenuItem(ID_COPY);
case KeyEvent.KEYCODE_V:
return onTextContextMenuItem(ID_PASTE);
case KeyEvent.KEYCODE_Z:
if (getCanUndo()) {
return onTextContextMenuItem(ID_UNDO);
}
case KeyEvent.KEYCODE_Y:
if (getCanRedo()) {
return onTextContextMenuItem(ID_REDO);
}
case KeyEvent.KEYCODE_S:
getMainActivity().saveTheFile(false);
return true;
default:
return super.onKeyDown(keyCode, event);
}
} else {
switch (keyCode) {
case KeyEvent.KEYCODE_TAB:
String textToInsert = " ";
int start, end;
start = Math.max(getSelectionStart(), 0);
end = Math.max(getSelectionEnd(), 0);
getText().replace(Math.min(start, end), Math.max(start, end),
textToInsert, 0, textToInsert.length());
return true;
default:
return super.onKeyDown(keyCode, event);
}
}
}
/**
* CTRL + C copy
* CTRL + V paste
* CTRL + B: compile
* CTRL + R generate
* CTRL + X cut
* CTRL + Z undo
* CTRL + Y redo
* CTRL + Q quit
* CTRL + S save
* CTRL + O open
* CTRL + F find
* CTRL + H find and replace
* CTRL + L format code
* CTRL + G: goto line
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (DLog.DEBUG) Log.w(TAG, "onKeyDown: " + keyCode + " " + event);
if (handleControlKey(keyCode, event, false)) {
return true;
}
if (event.isCtrlPressed() || mKeyListener.mControlKey.isActive()) {
// Log.i(TAG, "onKeyDown: process");
switch (keyCode) {
case KeyEvent.KEYCODE_A:
selectAll();
return true;
case KeyEvent.KEYCODE_X:
cut();
return true;
case KeyEvent.KEYCODE_C:
copy();
return true;
case KeyEvent.KEYCODE_V:
paste();
return true;
case KeyEvent.KEYCODE_G: //go to line
if (editorControl != null)
editorControl.goToLine();
return true;
case KeyEvent.KEYCODE_L: //format
if (editorControl != null)
editorControl.formatCode();
return true;
case KeyEvent.KEYCODE_Z:
if (canUndo()) {
undo();
}
return true;
case KeyEvent.KEYCODE_Y:
if (canRedo()) {
redo();
}
return true;
case KeyEvent.KEYCODE_S:
if (editorControl != null)
editorControl.saveCurrentFile();
return true;
case KeyEvent.KEYCODE_N:
if (editorControl != null)
editorControl.saveAs();
return true;
default:
return super.onKeyDown(keyCode, event);
}
} else {
switch (keyCode) {
case KeyEvent.KEYCODE_TAB:
String textToInsert = mSettings.getTabStr();
int start, end;
start = Math.max(getSelectionStart(), 0);
end = Math.max(getSelectionEnd(), 0);
getText().replace(Math.min(start, end), Math.max(start, end),
textToInsert, 0, textToInsert.length());
return true;
default:
try {
return super.onKeyDown(keyCode, event);
} catch (Exception e) {
}
return false;
}
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_BUTTON_B)
return super.onKeyDown(keyCode, event);
if (mIsLoading) {
switch (keyCode) {
case KeyEvent.KEYCODE_S:
case KeyEvent.KEYCODE_MEDIA_STOP:
exitOK();
return true;
}
return false;
}
showOverlayTimeout(OVERLAY_TIMEOUT);
switch (keyCode) {
case KeyEvent.KEYCODE_F:
case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
case KeyEvent.KEYCODE_MEDIA_NEXT:
seekDelta(10000);
return true;
case KeyEvent.KEYCODE_R:
case KeyEvent.KEYCODE_MEDIA_REWIND:
case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
seekDelta(-10000);
return true;
case KeyEvent.KEYCODE_BUTTON_R1:
seekDelta(60000);
return true;
case KeyEvent.KEYCODE_BUTTON_L1:
seekDelta(-60000);
return true;
case KeyEvent.KEYCODE_BUTTON_A:
if (mOverlayProgress.getVisibility() == View.VISIBLE)
return false;
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
case KeyEvent.KEYCODE_MEDIA_PLAY:
case KeyEvent.KEYCODE_MEDIA_PAUSE:
case KeyEvent.KEYCODE_SPACE:
if (mIsNavMenu)
return navigateDvdMenu(keyCode);
else if (keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE) //prevent conflict with remote control
return super.onKeyDown(keyCode, event);
else
doPlayPause();
return true;
case KeyEvent.KEYCODE_O:
case KeyEvent.KEYCODE_BUTTON_Y:
case KeyEvent.KEYCODE_MENU:
showAdvancedOptions(mAdvOptions);
return true;
case KeyEvent.KEYCODE_V:
case KeyEvent.KEYCODE_MEDIA_AUDIO_TRACK:
case KeyEvent.KEYCODE_BUTTON_X:
onAudioSubClick(mTracks);
return true;
case KeyEvent.KEYCODE_N:
showNavMenu();
return true;
case KeyEvent.KEYCODE_A:
resizeVideo();
return true;
case KeyEvent.KEYCODE_M:
case KeyEvent.KEYCODE_VOLUME_MUTE:
updateMute();
return true;
case KeyEvent.KEYCODE_S:
case KeyEvent.KEYCODE_MEDIA_STOP:
exitOK();
return true;
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_ENTER:
if (mIsNavMenu)
return navigateDvdMenu(keyCode);
else
return super.onKeyDown(keyCode, event);
case KeyEvent.KEYCODE_J:
delayAudio(-50000l);
return true;
case KeyEvent.KEYCODE_K:
delayAudio(50000l);
return true;
case KeyEvent.KEYCODE_G:
delaySubs(-50000l);
return true;
case KeyEvent.KEYCODE_H:
delaySubs(50000l);
return true;
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_VOLUME_UP:
if (mMute) {
updateMute();
return true;
} else
return false;
}
return super.onKeyDown(keyCode, event);
}
/**
* 判断是否为字母
*/
private boolean isLetter(SoftKey sKey) {
return ((sKey.getKeyCode() >= KeyEvent.KEYCODE_A) && (sKey.getKeyCode() <= KeyEvent.KEYCODE_Z));
}