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@oneyoung
Last active Dec 2, 2020
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Android Input control
/* stolen from input command
* but have some limitation:
* since it can use "android.permission.INJECT_EVENTS", (only system apps can do that)
* Inject event to other apps will raise a exception of no permission
*/
import android.hardware.input.InputManager;
import android.os.SystemClock;
import android.util.Log;
import android.view.InputDevice;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.InputEvent;
import android.content.Context;
import java.lang.reflect.Method;
/**
* Command that sends key events to the device, either by their keycode, or by
* desired character output.
*/
public class Input {
private static final String TAG = "Input";
private static final int INJECT_INPUT_EVENT_MODE_ASYNC = 0; // see InputDispatcher.h
private static final int INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT = 1; // see InputDispatcher.h
private static final int INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH = 2; // see InputDispatcher.h
private Context mContext;
public Input(Context context) {
mContext = context;
}
/* public method */
public void text(String text) {
sendText(InputDevice.SOURCE_KEYBOARD, text);
}
public void keyEvent(int keyCode, boolean longpress) {
sendKeyEvent(InputDevice.SOURCE_KEYBOARD, keyCode, longpress);
}
public void keyEvent(int keyCode) {
keyEvent(keyCode, false);
}
public void tap(float x, float y) {
sendTap(InputDevice.SOURCE_TOUCHPAD, x, y);
}
public void press() {
sendTap(InputDevice.SOURCE_TRACKBALL, 0.0f, 0.0f);
}
public void swipe(float x1, float y1, float x2, float y2, int duration) {
sendSwipe(InputDevice.SOURCE_TOUCHPAD, x1, y1, x2, y2, duration);
}
public void swipe(float x1, float y1, float x2, float y2) {
swipe(x1, y1, x2, y2, -1);
}
public void roll(float dx, float dy) {
sendMove(InputDevice.SOURCE_TRACKBALL, dx, dy);
}
/**
* Convert the characters of string text into key event's and send to
* device.
*
* @param text is a string of characters you want to input to the device.
*/
private void sendText(int source, String text) {
StringBuffer buff = new StringBuffer(text);
boolean escapeFlag = false;
for (int i=0; i<buff.length(); i++) {
if (escapeFlag) {
escapeFlag = false;
if (buff.charAt(i) == 's') {
buff.setCharAt(i, ' ');
buff.deleteCharAt(--i);
}
}
if (buff.charAt(i) == '%') {
escapeFlag = true;
}
}
char[] chars = buff.toString().toCharArray();
KeyCharacterMap kcm = KeyCharacterMap.load(KeyCharacterMap.VIRTUAL_KEYBOARD);
KeyEvent[] events = kcm.getEvents(chars);
for(int i = 0; i < events.length; i++) {
KeyEvent e = events[i];
e.setSource(source);
injectKeyEvent(e);
}
}
private void sendKeyEvent(int inputSource, int keyCode, boolean longpress) {
long now = SystemClock.uptimeMillis();
injectKeyEvent(new KeyEvent(now, now, KeyEvent.ACTION_DOWN, keyCode, 0, 0,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, inputSource));
if (longpress) {
injectKeyEvent(new KeyEvent(now, now, KeyEvent.ACTION_DOWN, keyCode, 1, 0,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_LONG_PRESS,
inputSource));
}
injectKeyEvent(new KeyEvent(now, now, KeyEvent.ACTION_UP, keyCode, 0, 0,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, inputSource));
}
private void sendTap(int inputSource, float x, float y) {
long now = SystemClock.uptimeMillis();
injectMotionEvent(inputSource, MotionEvent.ACTION_DOWN, now, x, y, 1.0f);
injectMotionEvent(inputSource, MotionEvent.ACTION_UP, now, x, y, 0.0f);
}
private void sendSwipe(int inputSource, float x1, float y1, float x2, float y2, int duration) {
if (duration < 0) {
duration = 300;
}
long now = SystemClock.uptimeMillis();
injectMotionEvent(inputSource, MotionEvent.ACTION_DOWN, now, x1, y1, 1.0f);
long startTime = now;
long endTime = startTime + duration;
while (now < endTime) {
long elapsedTime = now - startTime;
float alpha = (float) elapsedTime / duration;
injectMotionEvent(inputSource, MotionEvent.ACTION_MOVE, now, lerp(x1, x2, alpha),
lerp(y1, y2, alpha), 1.0f);
now = SystemClock.uptimeMillis();
}
injectMotionEvent(inputSource, MotionEvent.ACTION_UP, now, x2, y2, 0.0f);
}
/**
* Sends a simple zero-pressure move event.
*
* @param inputSource the InputDevice.SOURCE_* sending the input event
* @param dx change in x coordinate due to move
* @param dy change in y coordinate due to move
*/
private void sendMove(int inputSource, float dx, float dy) {
long now = SystemClock.uptimeMillis();
injectMotionEvent(inputSource, MotionEvent.ACTION_MOVE, now, dx, dy, 0.0f);
}
private void injectKeyEvent(KeyEvent event) {
Log.i(TAG, "injectKeyEvent: " + event);
injectInputEvent(event);
}
/**
* Builds a MotionEvent and injects it into the event stream.
*
* @param inputSource the InputDevice.SOURCE_* sending the input event
* @param action the MotionEvent.ACTION_* for the event
* @param when the value of SystemClock.uptimeMillis() at which the event happened
* @param x x coordinate of event
* @param y y coordinate of event
* @param pressure pressure of event
*/
private void injectMotionEvent(int inputSource, int action, long when, float x, float y, float pressure) {
final float DEFAULT_SIZE = 1.0f;
final int DEFAULT_META_STATE = 0;
final float DEFAULT_PRECISION_X = 1.0f;
final float DEFAULT_PRECISION_Y = 1.0f;
final int DEFAULT_DEVICE_ID = 0;
final int DEFAULT_EDGE_FLAGS = 0;
MotionEvent event = MotionEvent.obtain(when, when, action, x, y, pressure, DEFAULT_SIZE,
DEFAULT_META_STATE, DEFAULT_PRECISION_X, DEFAULT_PRECISION_Y, DEFAULT_DEVICE_ID,
DEFAULT_EDGE_FLAGS);
event.setSource(inputSource);
Log.i(TAG, "injectMotionEvent: " + event);
injectInputEvent(event);
}
private void injectInputEvent(InputEvent event) {
// inject using reflect
InputManager im = (InputManager) mContext.getSystemService(Context.INPUT_SERVICE);
Class[] paramTypes = new Class[2];
paramTypes[0] = InputEvent.class;
paramTypes[1] = Integer.TYPE;
Object[] params = new Object[2];
params[0] = event;
params[1] = INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH;
try {
Method hiddenMethod = im.getClass().getMethod("injectInputEvent", paramTypes);
hiddenMethod.invoke(im, params);
} catch (Exception e) {
e.printStackTrace();
}
}
private static final float lerp(float a, float b, float alpha) {
return (b - a) * alpha + a;
}
}
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