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How can I start and stop my countdowntimer using a button?

This is what I have so far .. it only starts when you open the application:

package com.android.countdown; import android.app.Activity; import android.os.Bundle; import android.os.CountDownTimer; import android.widget.TextView; public class countdown extends Activity { TextView mTextField; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTextField = (TextView) findViewById(R.id.timer1); new CountDownTimer(100000, 1000) { public void onTick(long millisUntilFinished) { mTextField.setText("Seconds remaining: " + millisUntilFinished / 1000); } public void onFinish() { mTextField.setText("Finished"); } }.start(); } }

I know that I need to call start() inside a procedure with buttons. However, if I move .start() , where it new CountDownTimer(100000 , 1000) { from in new CountDownTimer(100000 , 1000) { gets an error.

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Well ... maybe you need to first understand how Java and programming work. Then you can try to do something like this:

 CountDownTimer aCounter = new CountDownTimer(100000 , 1000) { public void onTick(long millisUntilFinished) { mTextField.setText("Seconds remaining: " + millisUntilFinished / 1000); } public void onFinish() { mTextField.setText("Finished"); } }; aCounter.start();
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You can do this to do what you want. Here is the Java code:

 package com.example.smartbroashad.countdowntimer; import android.os.CountDownTimer; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { TextView timing; TextView status; int workingornot=1; //running public void startmeplease(View view) { if (workingornot==1) { workingornot=2; //runned countDownTimerofme.start(); Toast.makeText(this,"STARTED!",Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this,"already started!",Toast.LENGTH_SHORT).show(); } } public void stopmeplease(View view) { countDownTimerofme.cancel(); status.setText("stoped!!"); workingornot=1; } public void settimeplease(View view) { } CountDownTimer countDownTimerofme=new CountDownTimer(10000,1000) { @Override public void onTick(long l) { timing.setText("time left: "+toString().valueOf(l/1000)); status.setText("started!!!"); } @Override public void onFinish() { timing.setText("time left: 0"); status.setText("completed !!!!"); workingornot=1;//now able to run again } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); timing=(TextView)findViewById(R.id.timer); status=(TextView)findViewById(R.id.status); } }

Here is the XML:

 <?xml version="1.0" encoding="utf-8"?> <android.support.constraint.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=" #8e44ad" tools:context="com.example.smartbroashad.countdowntimer.MainActivity"> <TextView android:id="@+id/status" android:layout_width="wrap_content" android:layout_height="133dp" android:layout_marginBottom="69dp" android:layout_marginTop="16dp" android:padding="20sp" android:text="@string/countdown_timer_not_running" android:textAlignment="center" android:textAllCaps="true" android:textColor="#2c3e50" android:textSize="32sp" android:textStyle="bold" app:layout_constraintBottom_toTopOf="@+id/linearLayout" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <LinearLayout android:id="@+id/linearLayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="61dp" android:layout_marginTop="32dp" android:orientation="vertical" app:layout_constraintBottom_toTopOf="@+id/linearLayout2" app:layout_constraintHorizontal_bias="1.0" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toBottomOf="@+id/status"> <EditText android:id="@+id/editText7" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:inputType="time" /> <Button android:id="@+id/settime" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:background=" #00aced" android:text="set time" android:onClick="settimeplease" android:textAlignment="center" android:textAllCaps="true" android:textColor="#2c3e50" android:textSize="32sp" android:textStyle="bold" /> </LinearLayout> <LinearLayout android:id="@+id/linearLayout2" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="48dp" android:layout_marginTop="32dp" android:orientation="vertical" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/linearLayout"> <TextView android:id="@+id/timer" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/running" android:textAlignment="center" android:textAllCaps="true" android:textColor="#2c3e50" android:textSize="32sp" android:textStyle="bold" tools:text="@string/running" /> <Button android:id="@+id/start" android:layout_width="match_parent" android:layout_height="wrap_content" android:background=" #64D448" android:text="start" android:onClick="startmeplease" android:textAlignment="center" android:textAllCaps="true" android:textColor="#2c3e50" android:textSize="32sp" android:textStyle="bold" /> <Button android:id="@+id/stop" android:layout_width="match_parent" android:layout_height="wrap_content" android:background=" #bb0000" android:text="stop" android:onClick="stopmeplease" android:textAlignment="center" android:textAllCaps="true" android:textColor="#ffffff" android:textSize="32sp" android:textStyle="bold" /> </LinearLayout> </android.support.constraint.ConstraintLayout>
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Source: https://habr.com/ru/post/1336879/

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