ClassCastException with no debuggable errors

ClassCastException with no debuggable errors - java

I am trying to create an object of fingerline(class) in drawline(activity).The fingerline takes the context of MainActivity(activity).I get ClassCastException showing that
Process: com.example.caddrawingtool, PID: 11405
java.lang.RuntimeException: Unable to instantiate application
com.example.caddrawingtool.MainActivity: java.lang.ClassCastException:
com.example.caddrawingtool.MainActivity cannot be cast to android.app.Application
at android.app.LoadedApk.makeApplication(LoadedApk.java:1226)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6504)
at android.app.ActivityThread.access$1400(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1892)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7436)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)
I have changed getApplicationContext() in drawline where the fingerline object was created to Activity context by using
this
I am not able to use
MainActivity.this
though.
Is there a way to simplify all this?
My MainActivity code:
public class MainActivity extends AppCompatActivity {
fingerline dv;
private Paint mpaint;
private Context context;
MainActivity MainActivity(){
return MainActivity.this;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dv = new fingerline(this);
setContentView(dv);
dv.setBackgroundColor(Color.BLACK);
mpaint = new Paint();
mpaint.setAntiAlias(true);
mpaint.setDither(true);
mpaint.setColor(Color.WHITE);
mpaint.setStyle(Paint.Style.STROKE);
mpaint.setStrokeJoin(Paint.Join.MITER);
mpaint.setStrokeCap(Paint.Cap.ROUND);
mpaint.setStrokeWidth(12);
getSupportActionBar().setTitle("3D TOOL");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.my_menu, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.line:
Intent intent = new Intent(this, drawline2.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
this.startActivity(intent);
break;
case R.id.circle:
Intent intent1=new Intent(this,drawcircle.class);
intent1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
this.startActivity(intent1);
break;
case R.id.rectangle:
Intent intent2=new Intent(this,drawrectangle.class);
intent2.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
this.startActivity(intent2);
break;
case R.id.offset:
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
My fingerline code:
public class fingerline extends View {
public int width, height;
private Bitmap mbitmap;
private Canvas mcanvas;
private Paint mpaint, mbitmappaint, circlepaint;
private float startx;
private float starty;
private float endx;
private float endy;
private Path path, circlepath;
Context c;
public fingerline(Context context) {
super(context);
// c = context;
path = new Path();
mpaint = new Paint();
mbitmappaint = new Paint(Paint.DITHER_FLAG);
circlepaint = new Paint();
circlepath = new Path();
circlepaint.setAntiAlias(true);
circlepaint.setColor(Color.WHITE);
circlepaint.setStyle(Paint.Style.STROKE);
circlepaint.setStrokeJoin(Paint.Join.MITER);
circlepaint.setStrokeWidth(4f);
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mbitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mcanvas = new Canvas(mbitmap);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
mpaint.setStyle(Paint.Style.STROKE);
mpaint.setColor(Color.WHITE);
mpaint.setStrokeWidth(12);
mpaint.setAntiAlias(true);
mpaint.setDither(true);
mpaint.setStrokeJoin(Paint.Join.MITER);
mpaint.setStrokeCap(Paint.Cap.ROUND);
canvas.drawBitmap(mbitmap, 0, 0, mbitmappaint);
canvas.drawPath(path, mpaint);
canvas.drawPath(circlepath, circlepaint);
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
path.reset();
path.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
float dX = Math.abs(x - mX);
float dY = Math.abs(y - mY);
if (dX >= TOUCH_TOLERANCE) {
path.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
mX = x;
mY = y;
}
}
private void touch_up() {
path.lineTo(mX, mY);
circlepath.reset();
mcanvas.drawPath(path, mpaint);
path.reset();
}
#SuppressLint("ClickableViewAccessibility")
#Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startx = event.getX();
starty = event.getY();
touch_start(startx, starty);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
startx = event.getX();
starty = event.getY();
touch_move(startx, starty);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
}
return true;
}
}
My drawline code:
public class drawline2 extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawline2);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
EditText editText, editText1;
editText = (EditText) findViewById(R.id.length);
editText1 = (EditText) findViewById(R.id.angle);
Canvas canvas;
Paint paint = new Paint();
Paint circlepaint = new Paint();
Path path = new Path();
Path cpath = new Path();
circlepaint.setAntiAlias(true);
circlepaint.setStrokeWidth(4f);
circlepaint.setColor(Color.WHITE);
circlepaint.setStyle(Paint.Style.STROKE);
circlepaint.setStrokeJoin(Paint.Join.MITER);
fingerline dv;
dv = new fingerline(this);
dv.setBackgroundColor(Color.BLACK);
setContentView(dv);
circlepaint.setAntiAlias(true);
circlepaint.setDither(true);
String value = editText.getText().toString();
int length =0;
double angle=0;
if(value!=null && value.length()>0){
try{
length = Integer.parseInt(value);
}
catch (NullPointerException e){
length=0;
}
}
String value1 = editText1.getText().toString();
if(value1!=null && value1.length()>0){
try{
angle = Double.parseDouble(value1);
}
catch (NullPointerException e){
angle=0;
}
}
int startX, startY, endX, endY, x, y;
x= 0;
y=0;
path.reset();
path.moveTo(x, y);
startX = (int) x;
startY = (int) y;
endY = (int) (x + length * Math.cos(angle));
endX = (int) (x + length * Math.sin(angle));
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
}
Thanks in advance.

In short:
MainActivity cannot be cast to android.app.Application
You could make this an awful lot more readable by calling it DrawlineActivity and FingerlineActivity. Then just use this or DrawlineActivity.this as the Context.

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I guess its because you are consuming the touch here. Try returning false.

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I would either scale down the image or consider using the Picasso image loading library: http://square.github.io/picasso/
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JSONObject photos = response.getJSONObject();
JSONArray linkY = photos.optJSONArray("images");
final JSONObject linkO = linkY.optJSONObject(0);
final String link2 = linkO.optString("source");
URL LINKF = new URL(link2);
connection = (HttpURLConnection) LINKF.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(input);
float HH = (float) bitmap.getHeight();
float WW = (float) bitmap.getWidth();
float ViewWidthX = (float) ViewWidth;
float height = (HH / WW) * ViewWidthX;
Bitmap bitmapF = Bitmap.createScaledBitmap(bitmap, ViewWidth, Math.round(height), false);
final ImageView image1 = (ImageView) findViewById(R.id.image1);
image1.setImageBitmap(bitmapF);
undos.add(bitmapF);
image1.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
Display d = getWindowManager().getDefaultDisplay();
float dw = d.getWidth();
float dh = d.getHeight();
float x = event.getX();
float y = event.getY();
float r = 2;
Bitmap BTX = ((BitmapDrawable)image1.getDrawable()).getBitmap();
Canvas canvas = new Canvas(BTX);
canvas.drawBitmap(BTX,0,0,null);
Paint paint1 = new Paint();
int bg1 = buttonchoose.getDrawingCacheBackgroundColor();
ColorDrawable buttonColor = (ColorDrawable) buttonchoose.getBackground();
int bg2 =buttonColor.getColor();
paint1.setColor(bg2);
paint1.setShadowLayer(5, 2, 2, bg2);
paint1.setStrokeWidth(20);
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
DownY = event.getY();
DownX = event.getX();
break;
case MotionEvent.ACTION_MOVE:
MoveY = event.getY();
MoveX = event.getX();
canvas.drawLine(DownX, DownY, MoveX, MoveY, paint1);
image1.invalidate();
DownX = MoveX;
DownY=MoveY;
break;
case MotionEvent.ACTION_UP:
UpY = event.getY();
UpX = event.getX();
canvas.drawLine(DownX, DownY, UpX, UpY, paint1);
image1.invalidate();
Bitmap BTXYZ = ((BitmapDrawable)image1.getDrawable()).getBitmap();
break;
}
return true;
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", "images");
request.setParameters(parameters);
request.executeAsync();
}
});
}
#Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.buttonchoose:
final ColorPicker cp = new ColorPicker(edit.this, 0, 0, 0);
/* Show color picker dialog */
cp.show();
/* On Click listener for the dialog, when the user select the color */
Button okColor = (Button) cp.findViewById(R.id.okColorButton);
okColor.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/* You can get single channel (value 0-255) */
int selectedColorR = cp.getRed();
int selectedColorG = cp.getGreen();
int selectedColorB = cp.getBlue();
/* Or the android RGB Color (see the android Color class reference) */
int selectedColorRGB = cp.getColor();
Button buttonchoose = (Button) findViewById(R.id.buttonchoose);
buttonchoose.setText("");
buttonchoose.setBackgroundColor(selectedColorRGB);
cp.dismiss();
}
});
break;
case R.id.imageButton2:
int newImage = undos.size();
Log.e("Lenght of Array",""+newImage);
if(newImage >=1) {
Bitmap newImage2 = undos.get(newImage-2);
ImageView IMGXV = (ImageView) findViewById(R.id.image1);
IMGXV.setImageBitmap(newImage2);
undos.remove(newImage-1);
}
break;
}
}
}

Try this exact code -
case R.id.imageButton2:
if(undos.size() > 0) {
Bitmap newImage2 = undos.remove(undos.size() - 1);
ImageView IMGXV = (ImageView) findViewById(R.id.image1);
IMGXV.setImageBitmap(newImage2);
}
break;
EDIT Added an extra line in onGlobalLayout(), try this -
Bitmap bitmapF = Bitmap.createScaledBitmap(bitmap, ViewWidth, Math.round(height), false);
final ImageView image1 = (ImageView) findViewById(R.id.image1);
image1.setImageBitmap(bitmapF);
//The extra line before adding bitmap to arraylist.
Bitmap bitmapFcopy = bitmapFcopy.copy(bitmapFcopy.getConfig(), true);
undos.add(bitmapFcopy);
EDIT 2
public class edit extends AppCompatActivity implements View.OnClickListener {
//Declare the imageview here and access this everywhere.
ImageView image1;
float MoveX,MoveY,DownY,DownX,UpY=0,UpX ;
List<Bitmap> undos = new ArrayList<Bitmap>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
//Get the reference here
image1 = (ImageView) findViewById(R.id.image1);
final ImageButton btn2 = (ImageButton) findViewById(R.id.imageButton2);
btn2.setOnClickListener(this);
final Button buttonchoose = (Button) findViewById(R.id.buttonchoose);
buttonchoose.setOnClickListener(this);
final RelativeLayout ViewX = (RelativeLayout) findViewById(R.id.RLXV);
ViewTreeObserver vto = ViewX.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
ViewX.getViewTreeObserver().removeOnGlobalLayoutListener(this);
Intent intent7 = getIntent();
String bitmapXY = (String) intent7.getExtras().get("BitmapImage");
GraphRequest request = GraphRequest.newGraphPathRequest(
AccessToken.getCurrentAccessToken(),
"/" + bitmapXY,
new GraphRequest.Callback() {
#Override
public void onCompleted(GraphResponse response) {
HttpURLConnection connection = null;
try {
int ViewWidth = ViewX.getMeasuredWidth();
JSONObject photos = response.getJSONObject();
JSONArray linkY = photos.optJSONArray("images");
final JSONObject linkO = linkY.optJSONObject(0);
final String link2 = linkO.optString("source");
URL LINKF = new URL(link2);
connection = (HttpURLConnection) LINKF.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(input);
float HH = (float) bitmap.getHeight();
float WW = (float) bitmap.getWidth();
float ViewWidthX = (float) ViewWidth;
float height = (HH / WW) * ViewWidthX;
Bitmap bitmapF = Bitmap.createScaledBitmap(bitmap, ViewWidth, Math.round(height), false);
//Remove from here and declare this in onCreate() and don't make it final
//final ImageView image1 = (ImageView) findViewById(R.id.image1);
image1.setImageBitmap(bitmapF);
undos.add(bitmapF);
image1.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
Display d = getWindowManager().getDefaultDisplay();
float dw = d.getWidth();
float dh = d.getHeight();
float x = event.getX();
float y = event.getY();
float r = 2;
Bitmap BTX = ((BitmapDrawable)image1.getDrawable()).getBitmap();
Canvas canvas = new Canvas(BTX);
canvas.drawBitmap(BTX,0,0,null);
Paint paint1 = new Paint();
int bg1 = buttonchoose.getDrawingCacheBackgroundColor();
ColorDrawable buttonColor = (ColorDrawable) buttonchoose.getBackground();
int bg2 =buttonColor.getColor();
paint1.setColor(bg2);
paint1.setShadowLayer(5, 2, 2, bg2);
paint1.setStrokeWidth(20);
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
DownY = event.getY();
DownX = event.getX();
break;
case MotionEvent.ACTION_MOVE:
MoveY = event.getY();
MoveX = event.getX();
canvas.drawLine(DownX, DownY, MoveX, MoveY, paint1);
image1.invalidate();
DownX = MoveX;
DownY=MoveY;
break;
case MotionEvent.ACTION_UP:
UpY = event.getY();
UpX = event.getX();
canvas.drawLine(DownX, DownY, UpX, UpY, paint1);
image1.invalidate();
Bitmap BTXYZ = ((BitmapDrawable)image1.getDrawable()).getBitmap();
break;
}
return true;
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", "images");
request.setParameters(parameters);
request.executeAsync();
}
});
}
#Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.buttonchoose:
final ColorPicker cp = new ColorPicker(edit.this, 0, 0, 0);
/* Show color picker dialog */
cp.show();
/* On Click listener for the dialog, when the user select the color */
Button okColor = (Button) cp.findViewById(R.id.okColorButton);
okColor.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/* You can get single channel (value 0-255) */
int selectedColorR = cp.getRed();
int selectedColorG = cp.getGreen();
int selectedColorB = cp.getBlue();
/* Or the android RGB Color (see the android Color class reference) */
int selectedColorRGB = cp.getColor();
Button buttonchoose = (Button) findViewById(R.id.buttonchoose);
buttonchoose.setText("");
buttonchoose.setBackgroundColor(selectedColorRGB);
cp.dismiss();
}
});
break;
case R.id.imageButton2:
int newImage = undos.size();
Log.e("Lenght of Array",""+newImage);
if(newImage >=1) {
Bitmap newImage2 = undos.get(newImage-2);
//Don't take reference again here
//ImageView IMGXV = (ImageView) findViewById(R.id.image1);
image1.setImageBitmap(newImage2);
undos.remove(newImage-1);
}
break;
}
}
}

how to use Double Tap event in android canvas to save current Image

I have Class which Extends View I'm able To Move one Image Over another For This I use Two Bitmap Image one Over Another now i want to save image's using Double Tap event but i dnt know how to do this....can anyone have some idea or code for this ......
`public class ShowCanvas extends View {
Bitmap CanvasBitmap;
Bitmap ScaledBitmap;
Bitmap smallbitmap;
private static final int INVALID_POINTER_ID = -1;
private Drawable mImage;
private float mPosX;
private float mPosY;
private float mLastTouchX;
private float mLastTouchY;
private int mActivePointerId = INVALID_POINTER_ID;
private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
public ShowCanvas(Context context) {
this(context, null, 0);
// TODO Auto-generated constructor stub
ScaledBitmap = DrawView.scaled;
mImage = new BitmapDrawable(getResources(), Dress.bitmap);
System.out.println("MImage" +mImage);
mImage.setBounds(0, 0, mImage.getIntrinsicWidth(),
mImage.getIntrinsicHeight());
}
public ShowCanvas(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ShowCanvas(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
}
public void setBitmap(Bitmap bitmap) {
// TODO Auto-generated method stub
CanvasBitmap = bitmap;
System.out.println("CanvasBitmap" + CanvasBitmap);
int X = CanvasBitmap.getHeight();
int Y = CanvasBitmap.getWidth();
System.out.println("CanvasBitmap " + X + "\t" + Y);
}
#Override
public boolean isLongClickable() {
// TODO Auto-generated method stub
System.out.println("ISLongClickable");
return super.isLongClickable();
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
// Let the ScaleGestureDetector inspect all events.
mScaleDetector.onTouchEvent(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
mLastTouchX = x;
mLastTouchY = y;
mActivePointerId = ev.getPointerId(0);
break;
}
case MotionEvent.ACTION_MOVE: {
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
// Only move if the ScaleGestureDetector isn't processing a
// gesture.
if (!mScaleDetector.isInProgress()) {
final float dx = x - mLastTouchX;
final float dy = y - mLastTouchY;
mPosX += dx;
mPosY += dy;
invalidate();
}
mLastTouchX = x;
mLastTouchY = y;
break;
}
case MotionEvent.ACTION_UP: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_CANCEL: {
mActivePointerId = INVALID_POINTER_ID;
break;
}
case MotionEvent.ACTION_POINTER_UP: {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastTouchX = ev.getX(newPointerIndex);
mLastTouchY = ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
}
break;
}
}
return true;
}
#Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
Paint mpaint = new Paint();
canvas.save();
canvas.drawBitmap(ScaledBitmap, 0, 0, mpaint);
Log.d("DEBUG", "X: " + mPosX + " Y: " + mPosY);
canvas.translate(mPosX, mPosY);
canvas.scale(mScaleFactor, mScaleFactor);
mImage.draw(canvas);
canvas.restore();
}
private class ScaleListener extends
ScaleGestureDetector.SimpleOnScaleGestureListener {
#Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
// Don't let the object get too small or too large.
mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 10.0f));
invalidate();
return true;
}
}
}`

If you mean double tap you have to use GestureDetector.OnDoubleTapListener. check this link
try this
public class MyView extends View {
GestureDetector gestureDetector;
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
// creating new gesture detector
gestureDetector = new GestureDetector(context, new GestureListener());
}
// skipping measure calculation and drawing
// delegate the event to the gesture detector
#Override
public boolean onTouchEvent(MotionEvent e) {
return gestureDetector.onTouchEvent(e);
}
private class GestureListener extends GestureDetector.SimpleOnGestureListener {
#Override
public boolean onDown(MotionEvent e) {
return true;
}
// event when double tap occurs
#Override
public boolean onDoubleTap(MotionEvent e) {
float x = e.getX();
float y = e.getY();
Log.d("Double Tap", "Tapped at: (" + x + "," + y + ")");
return true;
}
}
}

We Keep Coding

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

ClassCastException with no debuggable errors - java

In short: MainActivity cannot be cast to android.app.Application You could make this an awful lot more readable by calling it DrawlineActivity and FingerlineActivity. Then just use this or DrawlineActivity.this as the Context.

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