Tag: app

i am new to android studio, and this is my first program. However, before sometime it was working fine, but now when i run the code, it crashes.
here’s my code:)

content_main.xml:

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/pitch"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:ignore="MissingClass">

    <ImageView
        android:id="@+id/box"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_marginStart="120dp"
        android:layout_marginLeft="120dp"
        android:layout_marginTop="480dp"
        android:src="@drawable/cricketer"
        app:layout_constraintBottom_toTopOf="@+id/text"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints"
        tools:srcCompat="@tools:sample/avatars" />

    <FrameLayout
        android:id="@+id/frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteX="-135dp"
        tools:layout_editor_absoluteY="-98dp">

        <TextView
            android:id="@+id/score"
            android:layout_width="485dp"
            android:layout_height="345dp"
            android:text="Score: 0"
            android:textSize="30dp"
            tools:ignore="MissingConstraints" />

        <ImageView
            android:id="@+id/pink"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:src="@drawable/red_ball"
            tools:ignore="MissingConstraints"
            tools:srcCompat="@tools:sample/avatars" />

    </FrameLayout>

    <ImageView
        android:id="@+id/black"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:src="@drawable/blue_ball"
        tools:ignore="MissingClass,MissingConstraints"
        tools:layout_editor_absoluteX="30dp"
        tools:layout_editor_absoluteY="30dp"
        tools:srcCompat="@tools:sample/avatars" />

    <ImageView
        android:id="@+id/orange"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:src="@drawable/violet_ball"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteX="30dp"
        tools:layout_editor_absoluteY="30dp"
        tools:srcCompat="@tools:sample/avatars" />

    <Button
        android:id="@+id/leftBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Left"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.061"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.966" />

    <Button
        android:id="@+id/rightBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Right"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.938"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.963" />

    <TextView
        android:id="@+id/text"
        android:layout_width="146dp"
        android:layout_height="124dp"
        android:text="Tap To Play"
        android:textSize="28dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.667"
        tools:ignore="MissingConstraints" />

</androidx.constraintlayout.widget.ConstraintLayout>

Main_Activity.java:

package com.example.subwaycricketer;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Bundle;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity implements View.OnTouchListener {
    private int screenHeight;
    private int screenWidth;

    private Button btn;

    private boolean gameover = false;

    private TextView text;

    private ImageView box, pink, black, orange;
    private FrameLayout frame;
    private Drawable imageBoxRight, imageBoxLeft;
    private float boxX, boxY, pinkY, pinkX, blackX, blackY, orangeX, orangeY;
    private boolean start = false;
    private boolean action_left, action_right;

    private Timer timer = new Timer();
    private Handler handler = new Handler();

    Canvas c;
    Paint paint;
    private View view;
    private MotionEvent motionEvent;
    private float frameHeight;
    private float pinkSize, orangeSize, blackSize, boxSize, boxWidth;
    private int score;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        box = findViewById(R.id.box);
        pink = findViewById(R.id.pink);
        orange = findViewById(R.id.orange);
        black = findViewById(R.id.black);
        text = findViewById(R.id.text);

        // pos
        orange.setX(200.0f);
        orange.setY(-80.0f);
        pink.setX(580.0f);
        pink.setY(-80.0f);
        black.setX(460.0f);
        black.setY(-80.0f);

        findViewById(R.id.leftBtn).setOnTouchListener(this);
        findViewById(R.id.rightBtn).setOnTouchListener(this);
    }

    public void changePos() {
        hitcheck();

        boxX = box.getX();
        boxY = box.getY();

        // Left
        if (action_left) {
            boxX -= 20;
        }

        // Right
        if (action_right) {
            boxX += 20;
        }

        if (boxX < -70) boxX = -70;

        if(boxX > 450) {
            boxX = 450;
        }

        box.setX(boxX);
        box.setY(boxY);

        if(start) {
            pinkY += 26;
            orangeY += 10;
            blackY += 6;
        }

        pink.setY(pinkY);
        orange.setY(orangeY);
        black.setY(blackY);

        if(blackY >= 1550) {
            blackY = -20;
        }
    }

    public void hitcheck() {

        // Black
        float blackCenterX = blackX + black.getWidth() / 2.0f;
        float blackCenterY = blackY + black.getHeight() / 2.0f;

        // Black
        float orangeCenterX = orangeX + orange.getWidth() / 2.0f;
        float orangeCenterY = orangeY + orange.getHeight() / 2.0f;

        // Black
        float pinkCenterX = pinkX + pink.getWidth() / 2.0f;
        float pinkCenterY = pinkY + pink.getHeight() / 2.0f;


        if ( blackCenterY >= boxY && blackCenterY >= boxY + boxSize / 2 && blackCenterX <= boxX && blackCenterX >= boxX - boxWidth) {
            start = false;
            action_right = false;
            action_left = false;
        }

    }

    @SuppressLint("ClickableViewAccessibility")
    public boolean onTouch(View view, MotionEvent motionEvent) {
        this.view = view;
        this.motionEvent = motionEvent;
        if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
            switch (view.getId()) {
                case R.id.leftBtn:
                    action_left = true;
                    break;
                case R.id.rightBtn:
                    action_right = true;
                    break;
            }
        } else {
            action_left = false;
            action_right = false;
        }
        return true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(!start) {
            start = true;
            text.setVisibility(View.INVISIBLE);

            pinkSize = pink.getHeight();
            orangeSize = orange.getHeight();
            blackSize = black.getHeight();
            boxWidth = box.getWidth();

            boxSize = box.getHeight();

            frame = findViewById(R.id.frame);

            timer.schedule(new TimerTask() {
                @Override
                public void run() {
                    handler.post(new Runnable() {
                        @Override
                        public void run() {
                            changePos();
                        }
                    });
                }
            }, 0, 20);
        }
        return super.onTouchEvent(event);
    }
}

any help would be very appreciated:)