Develop Reference

I can not use MotionEvent with Rajawali

Rajawali Version or Branch
rajawali:1.0.186
Device and Android Version
ADV Nexus 5X API 19 Android 4.4
Summary
I'm trying to make the camera moves when a MotionEvent (touch) occurs. I tried the code from https://github.com/Rajawali/Rajawali/issues/428 but it did not work for me.
My code
public class Renderer extends RajawaliRenderer {
public Context context;
private DirectionalLight directionalLight;
public Renderer(Context context) {
super(context);
this.context = context;
setFrameRate(60);
}
private Object3D object, star;
public void initScene(){
getCurrentScene().setBackgroundColor(Color.rgb(5,104,255));
directionalLight = new DirectionalLight(1f, .2f, -1.0f);
directionalLight.setColor(1.0f, 1.0f, 1.0f);
directionalLight.setPower(2);
getCurrentScene().addLight(directionalLight);
//LoaderOBJ objParser = new LoaderOBJ(this,"Load/1c_obj");
LoaderOBJ objParser = new LoaderOBJ(mContext.getResources(),mTextureManager, R.raw.primo_obj);
LoaderOBJ starParser = new LoaderOBJ(mContext.getResources(),mTextureManager,R.raw.star_obj);
try {
objParser.parse();
starParser.parse();
object = objParser.getParsedObject();
star = starParser.getParsedObject();
getCurrentScene().addChild(star);
getCurrentScene().addChild(object);
} catch (ParsingException e) {
e.printStackTrace();
}
getCurrentCamera().setLookAt(object.getWorldPosition());
Log.d("->",getCurrentCamera().getX()+","+getCurrentCamera().getY()+","+getCurrentCamera().getZ());
getCurrentCamera().setZ(40);
}
#Override
public void onRender(final long elapsedTime, final double deltaTime) {
super.onRender(elapsedTime, deltaTime);
Camera cam = getCurrentCamera();
Vector3 s = cam.getPosition();
if (touchTurn != 0) {
if (flagMulti) {
Double r = Math.sqrt(s.x * s.x + s.z * s.z);
angle += touchTurn;
angle %= 360;
cam.setPosition((float) (r * Math.cos(angle)), s.y, (float) (r * Math.sin(angle)));
cam.setLookAt(object.getLookAt());
}
else{
s.x+=touchTurn*5;
cam.setPosition(s);
}
touchTurn = 0;
}
if (touchTurnUp != 0) {
if (!flagMulti) {
s.z += touchTurnUp * 5;
cam.setPosition(s);
}
touchTurnUp = 0;
}
}
#Override
public void onTouchEvent(MotionEvent me){
Log.d("touch ","Log touch");
int pointerCount = me.getPointerCount();
if(pointerCount == 2)
flagMulti = true;
if (me.getAction() == MotionEvent.ACTION_DOWN) {
xpos = me.getX();
ypos = me.getY();
}
if (me.getAction() == MotionEvent.ACTION_UP) {
xpos = -1;
ypos = -1;
touchTurn = 0;
touchTurnUp = 0;
}
if (me.getAction() == MotionEvent.ACTION_MOVE) {
float xd = me.getX() - xpos;
float yd = me.getY() - ypos;
xpos = me.getX();
ypos = me.getY();
touchTurn = xd / -100f;
touchTurnUp = yd / -100f;
Log.d("touchTurn ", touchTurn+" - "+touchTurnUp);
}
try {
Thread.sleep(15);
} catch (Exception e) {
}
}
public void onOffsetsChanged(float x, float y, float z, float w, int i, int j){
}}

Would you consider arcballCamera and target to your 3D object. You can then rotate the 3D object and zoom in/out with arcballCamera.

How to make a simple touch screen test application?

I want to make a simple touch screen test application like Samsung Device Diagnostic Tool.
A screenshot from Samsung Device Diagnostic Tool: http://i.stack.imgur.com/7KgKW.jpg
I'm not very familiar with Android App Development. Which way would you suggest me to make a simple application like the tool I mentioned above?

The development of this application easy matter. You need to understand:
How to get the coordinates of click.
#Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int)(event.getX()/tileSize);
int y = (int)(event.getY()/tileSize);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
map[x][y] = true;
break;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
}
return false;
}
Override method onDraw, to draw rectangles.
private void init(){
tileSize = 10;
paint1 = new Paint();
paint1.setColor(Color.BLUE);
paint1.setStrokeWidth(10);
paint1.setStyle(Paint.Style.STROKE);
paint2 = new Paint();
paint2.setColor(Color.RED);
paint2.setStrokeWidth(10);
paint2.setStyle(Paint.Style.STROKE);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for (int i = 0; i < x; i++){
for (int j = 0; j < y; j++){
Paint p = null;
if(map[i][j]){
p=paint1;
}else{
p=paint2;
}
canvas.drawRect(i*tileSize, j*tileSize, tileSize, tileSize, paint);
}
}
}
}

Recently I also had to make this screen test in my app. So I had figured a solution. I am taking an array of RectF i.e. ArrayList<RectF> arr = new ArrayList<>() and drawing this Rects in following order :
Left vertical line
private void drawLeftLine(int width, int height) {
int leftPoint = 0;
int topPoint = 0;
int rightPoint = 100;
int bottomPoint = 100;
int maxNoOfRect = height / 100;
int lastRectHeight = height % 100;
for (int i = 0; i < maxNoOfRect; i++) {
arr.add(new RectF(leftPoint, topPoint, rightPoint, bottomPoint));
topPoint = bottomPoint;
bottomPoint = bottomPoint + 100;
}
}
Top Horizontal line
private void drawTopLine(int w, int h) {
int leftPoint = 0;
int topPoint = 0;
int rightPoint = 100;
int bottomPoint = 100;
int maxNoOfRect = w / 100;
int lastRectWidth = w % 100;
for (int i = 0; i < maxNoOfRect; i++) {
arr.add(new RectF(leftPoint, topPoint, rightPoint, bottomPoint));
leftPoint = rightPoint;
rightPoint = rightPoint + 100;
}
arr.add(new RectF(leftPoint, topPoint, rightPoint + lastRectWidth, bottomPoint));
}
and similarly; 3. Right vertical line 4. Bottom horizontal line, with the help of collections of RectF of size 100.
So, when user touch a point, check whether that co-ordinate lies in any of the RectF bounds? If yes, remove that RectF from the array.
like :
#Override
public boolean onTouchEvent(MotionEvent event) {
float touchX = event.getX();
float touchY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (mOnViewTouchedListener != null)
mOnViewTouchedListener.onViewTouched();
Point point = new Point();
point.x = (int) event.getX();
point.y = (int) event.getY();
Log.d("TAG", "point: " + point);
for (int i = 0; i < arr.size(); i++) {
if (arr.get(i).contains(point.x, point.y)) {
Log.d("TAG", "Touch IN");
arr.remove(i);
invalidate();
break;
}
}
break;
case MotionEvent.ACTION_MOVE:
if (mOnViewTouchedListener != null)
mOnViewTouchedListener.onViewTouched();
Log.d("TAG", "ACTION_MOVE");
Point point1 = new Point();
point1.x = (int) event.getX();
point1.y = (int) event.getY();
Log.d("TAG", "point: " + point1);
for (int i = 0; i < arr.size(); i++) {
if (arr.get(i).contains(point1.x, point1.y)) {
Log.d("TAG", "Touch IN");
arr.remove(i);
invalidate();
break;
}
}
break;
default:
return false;
}
return true;
}
So, this is the solution for this. Same way the diagonal lines are also drawn.
Diagonal line from top left to bottom right :
private void drawTBDiagonalLine(int w, int h) {
float height = h;
float width = w;
float slope = (height / width);
float left = 0;
float top = 0;
float bottom = 100;
float right = bottom / slope;
int maxNoOfRect = h / 100;
for (int i = 0; i < maxNoOfRect; i++) {
arr.add(new RectF(left, top, right, bottom));
left = right;
top = bottom;
bottom = bottom + 100;
right = bottom / slope;
}
}

Get Android Keyboard Height

I am trying to get android keyboard Height with following code
parentLayout.getViewTreeObserver().addOnGlobalLayoutListener(
new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
Rect r = new Rect();
parentLayout.getWindowVisibleDisplayFrame(r);
int screenHeight = parentLayout.getRootView().getHeight();
int heightDifference = screenHeight - (r.bottom);
previousHeightDiffrence = heightDifference;
if (heightDifference > 100) {
isKeyBoardVisible = true;
changeKeyboardHeight(heightDifference);
} else {
if(emojiKeyboard.getVisibility()==View.INVISIBLE){
emojiKeyboard.setVisibility(View.GONE);
}
isKeyBoardVisible = false;
}
}
});
and that works well with android:windowSoftInputMode="adjustPan" but that results my activity screen to move upward when default keyboard shows up.
All I need is to get keyboard height and show my custom keyboard under default keyboard, according to me that's only possible withandroid:windowSoftInputMode="adjustPan" or android:windowSoftInputMode="AdjustNothing".
And if set android:windowSoftInputMode="adjustNothing" then I can't get keyboard height.
I need alternative solution for my problem.
Advance Thanks!

I use this method for calc keyboard height:
public static int getKeyboardHeight() {
// viewMain <-- findViewById( android.R.id.content).getRootView();
if( viewMain != null) iSoftkeyboardHeight = viewMain.getHeight();
int y = iSoftkeyboardHeight - 2;
int x = 10;
int counter = 0;
int height = y;
int iSoftkeyboardHeightNow = 0;
Instrumentation instrumentation = new Instrumentation();
while( true) {
final MotionEvent m = MotionEvent.obtain( SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, x, y, 0);
final MotionEvent m1 = MotionEvent.obtain( SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, x, y, 0);
boolean ePointerOnSoftkeyboard = false;
try {
instrumentation.sendPointerSync(m);
instrumentation.sendPointerSync(m1);
}
catch (SecurityException e) {
ePointerOnSoftkeyboard = true;
}
if( !ePointerOnSoftkeyboard) {
if( y == height) {
if( counter++ < 100) {
Thread.yield();
continue;
}
}
else
if( y > 0)
iSoftkeyboardHeightNow = iSoftkeyboardHeight - y;
break;
}
y--;
m.recycle();
m1.recycle();
}
if( iSoftkeyboardHeightNow > 0) iSoftkeyboardHeight = iSoftkeyboardHeightNow;
else iSoftkeyboardHeight = 0;
return iSoftkeyboardHeight;
}

rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
Rect r = new Rect();
parent.getWindowVisibleDisplayFrame(r);
int screenHeight = parent.getRootView().getHeight();
int heightDifference = screenHeight - (r.bottom - r.top);
Log.d("Keyboard Size", "Size: " + heightDifference);
}
});

Try this code -
public static void hideSoftKeyboard(EditText editText) {
if (null != editText) {
InputMethodManager imm = (InputMethodManager) editText.getContext()
.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(editText.getWindowToken(), 0);
}
}

Simulating multi-touch events (one finger linear swipe)

I am doing an edit to a driver file that uses Multi-Touch protocol.
My goal is to bind a swipe gesture from (x1,y1) to (x2,y2) that follows a line.
To do this i execute this function inside the key pressure detection function:
static void do_swipe(struct kp *kp, long xstart, long ystart, long xend, long yend,
int id) {
printk("SWIPE! X1 %d Y1 %d X2 %d Y2 %d ID %d \n",xstart,ystart,xend,yend,id);
int sx, sy;
int dx = abs(xend - xstart);
int dy = abs(yend - ystart);
if (xstart < xend)
sx = 1;
else
sx = -1;
if (ystart < yend)
sy = 1;
else
sy = -1;
int err = dx - dy;
long tempx = xstart;
long tempy = ystart;
while (1) {
key_report(kp, tempx, tempy, id);
//Touch is now detected with input_sync
input_sync(kp->input);
if(tempx == xend && tempy == yend) break;
int e2 = 2 * err;
if (e2 > (-1)*dy) {
err = err - dy;
tempx = tempx + sx;
} else if (e2 < dx) {
err = err + dx;
tempy = tempy + sy;
}
}
printk("END! X %d Y %d \n",tempx, tempy);
}
This function is an edited Bresenham's line algorhitm that instead of drawing a line calls key_report to simulate a touch at the given coordinates.
static void key_report(struct kp *kp, long x, long y, int id) {
if (x == 0 && y == 0) {
//printk("---------- zero point --------------\n");
;
} else {
input_report_key(kp->input, BTN_TOUCH, 1);
input_report_abs(kp->input, ABS_MT_TRACKING_ID, id);
input_report_abs(kp->input, ABS_MT_TOUCH_MAJOR, 20);
input_report_abs(kp->input, ABS_MT_WIDTH_MAJOR, 20);
input_report_abs(kp->input, ABS_MT_POSITION_X, x);
input_report_abs(kp->input, ABS_MT_POSITION_Y, y);
input_mt_sync(kp->input);
}
release = 1;
}
Where kp-> input is so defined
struct input_dev *input;
Edit: I updated the code and I'm also attaching the generic code of a key pressure, because I'd like the driver to perform a swipe only once for each key pressure, to avoid swipe looping.
static void kp_work(struct kp *kp) {
int i, code, value;
kp_search_key(kp);
if (key_param[0] == 3) {
if (kp->key_valid[4] == 1) {
value = kp->key_value[4];
kp->flagchan4 = 0;
if (value >= 0 && value <= (9 + 40)) {
if (key_param[99] == 1 ) {
do_swipe(kp, key_param[25], key_param[26], key_param[97],
key_param[98], 12);
} else
key_report(kp, key_param[25], key_param[26], 12);
} else if (value >= 392 - 40 && value <= (392 + 40)) {
if (key_param[102] == 1) {
do_swipe(kp, key_param[23], key_param[24], key_param[100],
key_param[101], 12);
} else
key_report(kp, key_param[23], key_param[24], 12);
}
kp->flagchan4 = 0;
} else {
kp->flagchan4 = 1;
}
}
input_sync(kp->input);
}
Maybe i could set a check on kp->flagchan4...
Edit: Setting a check on flagchan4 did the trick.

Android: How to prevent moving object crossing the line

#Override protected void onDraw(Canvas canvas) {
//canvas.drawPicture();
canvas.drawColor(Color.CYAN);
Paint p= new Paint();
p.setColor(Color.RED);
p.setStrokeWidth(20);
canvas.drawLine(100, 200, 400, 500, p);
if(movingObjects.size() > 0){
for (MovingObject ball : movingObjects) {
canvas.drawBitmap(ball.getBitmap(), ball.getX(), ball.getY(), null);
}
}
}
public boolean onTouchEvent(MotionEvent event) {
int eventaction = event.getAction();
int X = (int)event.getX();
int Y = (int)event.getY();
boolean redraw = false;
switch (eventaction ) {
case MotionEvent.ACTION_DOWN:
currentMovingObjectId = 0;
for (MovingObject movingObject : movingObjects) {
int topLeftX = movingObject.getX() ;
int topLeftY = movingObject.getY() ;
double imageSize = movingObject.getSize();
double radCircle = Math.sqrt( (double) (((topLeftX-X)*(topLeftX-X)) + (topLeftY-Y)*(topLeftY-Y)));
if ( (radCircle < imageSize) &&
(X- topLeftX) < movingObject.getWidth() && (Y - topLeftY) < movingObject.getHeight() &&
(X- topLeftX) > 0 && (Y- topLeftY) > 0){
currentMovingObjectId = movingObjects.indexOf(movingObject) + 1;
offsetX = X- topLeftX;
offsetY = Y - topLeftY;
redraw = true;
break;
}
}
break;
case MotionEvent.ACTION_MOVE:
if ( currentMovingObjectId > 0) {
drawAtX = X - offsetX;
drawAtY = Y - offsetY;
if(drawAtX < 0 || (drawAtX + movingObjects.get(currentMovingObjectId-1).getWidth()) > MovingObject.screenWidth)
drawAtX = movingObjects.get(currentMovingObjectId-1).getX();
if(drawAtY < 0 || (drawAtY + movingObjects.get(currentMovingObjectId-1).getHeight()) > MovingObject.screenHeight)
drawAtY = movingObjects.get(currentMovingObjectId-1).getY();
if(drawAtX != movingObjects.get(currentMovingObjectId-1).getX() || drawAtY != movingObjects.get(currentMovingObjectId-1).getY()){
movingObjects.get(currentMovingObjectId-1).setX(drawAtX);
movingObjects.get(currentMovingObjectId-1).setY(drawAtY);
redraw = true;
}
}
break;
case MotionEvent.ACTION_UP:
break;
}
if(redraw)
invalidate();
return true;
}
The above code describes the onTouch and onDraw method in my custom view class and i have to prevent image cross the line.As we can implement using matrix where we can move the object horizontal and vertical avoiding the object by setting the wall on 4 sides of cell but i have to move object freely inside a puzzle.Any logic would be helpful i am stuck.Thanks in advance