android - Timer resetting again on pressing pause button and not running in background

Question

I have created an up count counter for that I am running a background service so that the counter will run in the background even after the app being killed. But when the app is killed, the counter begins counting from the starting and when I press the pause button and play it again, the counter again begins counting as before from the starting. Below is the code for my service and Activity. Please help me out.

package io.funswitch.gymmon.Services;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.SystemClock;
import android.support.annotation.Nullable;

import java.util.Locale;

import static io.funswitch.gymmon.Fragments.CheckOutFragment.running;

    public class TimerService  extends Service {
    private Intent intent;
    public static final String BROADCAST_ACTION = "com.javacodegeeks.android.androidtimerexample.MainActivity";

    private Handler handler = new Handler();
    private long initial_time;
    long timeInMilliseconds = 0L;

    @Override
    public void onCreate() {
        super.onCreate();
        initial_time = SystemClock.uptimeMillis();
        intent = new Intent(BROADCAST_ACTION);
        handler.removeCallbacks(sendUpdatesToUI);
        handler.postDelayed(sendUpdatesToUI, 1000); // 1 second

    }

    private Runnable sendUpdatesToUI = new Runnable() {
        public void run() {
            DisplayLoggingInfo();
            handler.postDelayed(this, 1000); // 1 seconds
        }
    };

    private void DisplayLoggingInfo() {

        timeInMilliseconds = SystemClock.uptimeMillis() - initial_time;

        int timer = (int) timeInMilliseconds / 1000;
        intent.putExtra("time", timer);
        sendBroadcast(intent);

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        handler.removeCallbacks(sendUpdatesToUI);

    }



    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }


}

CheckoutActivity.java

 package io.funswitch.gymmon.activities;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Locale;

import io.funswitch.gymmon.Fragments.CheckOutFragment;
import io.funswitch.gymmon.R;
import io.funswitch.gymmon.Services.TimerService;

public class CheckOutActivity extends AppCompatActivity implements View.OnClickListener {
    private Boolean exit = false;
    ImageView play_pause, play;
    private int milliseconds;
    public boolean running;
    TextView timer;
    int time;


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_check_out);
        play_pause = findViewById(R.id.pause_play);
        timer = findViewById(R.id.timer);
        play = findViewById(R.id.play);
        play_pause.setOnClickListener(this);
        play.setOnClickListener(this);
        time = getIntent().getIntExtra("time", 0);

//        if (savedInstanceState == null) {
//            FragmentManager fragmentManager = getSupportFragmentManager();
//            CheckOutFragment stepsDetailActivityFragment = new CheckOutFragment();
//            fragmentManager.beginTransaction()
//                    .add(R.id.check_out_frame, stepsDetailActivityFragment)
//                    .commit();
//
//        }
//        int time = getIntent().getIntExtra("time", 0);
//        Bundle bundle = new Bundle();
//        bundle.putInt("time", time);
//// set Fragmentclass Arguments
//        CheckOutFragment fragobj = new CheckOutFragment();
//        fragobj.setArguments(bundle);

    }

    @Override
    public void onClick(View v) {
        if (v == play_pause) {
            if (running) {
//                SharedPreferences sharedPreferences = getSharedPreferences("myPref", 0);
//                sharedPreferences.getInt("tim", 0);
                stopService(new Intent(CheckOutActivity.this, TimerService.class));
                running = false;
                play_pause.setImageResource(R.drawable.ic_play_button);
            } else {
                SharedPreferences sharedPreferences = getSharedPreferences("myPref", 0);
                sharedPreferences.getInt("timee", 0);
                running = true;
                play_pause.setImageResource(R.drawable.ic_pause);
                registerReceiver(broadcastReceiver, new IntentFilter(TimerService.BROADCAST_ACTION));
                startService(new Intent(CheckOutActivity.this, TimerService.class));

            }
        }
    }

    private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            runTimer(intent);
        }
    };

    @Override
    protected void onStop() {
        super.onStop();
        running = true;
        Intent intent = new Intent(CheckOutActivity.this, TimerService.class);
        startService(intent);
        registerReceiver(broadcastReceiver, new IntentFilter(TimerService.BROADCAST_ACTION));
//        running = false;
//        stopService(new Intent(CheckOutActivity.this, TimerService.class));
//        unregisterReceiver(broadcastReceiver);


    }


    public void runTimer(Intent intent) {
        time = intent.getIntExtra("time", 0);
        int hour = time / 3600;
        int mins = time / 60;
        int secs = time % 60;
        String timerTask = String.format(Locale.US, "%02d:%02d:%02d", hour, mins, secs);
        timer.setText(timerTask);
        SharedPreferences sharedPreferences = getSharedPreferences("myPref", 0);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putInt("tim", time);
        editor.apply();
    }


    @Override
    public void onBackPressed() {
        super.onBackPressed();
        if (exit) {
            finish(); // finish activity
        } else {
            Toast.makeText(this, "Press Back again to Exit.",
                    Toast.LENGTH_SHORT).show();
            exit = true;
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    exit = false;
                }
            }, 2 * 1000);

        }
    }


    @Override
    protected void onResume() {
        super.onResume();

//        Intent intent = new Intent(CheckOutActivity.this, TimerService.class);
//        startService(intent);
//        registerReceiver(broadcastReceiver, new IntentFilter(TimerService.BROADCAST_ACTION));
    }


}

I have also tried to save values in sharedPreferences and retrieving it when play button clicks but it's not working. Please help me out.

标签： androidandroid-service

Answer 1

您需要将计数器保存在 sharedprefrences 中并在服务重新启动时恢复计数器值

在你的CheckOutActivity

    @Override
            protected void onStop() {
        // save counter(time) value to sharedprefrences 
        running = false;
        stopService(intent)
        unregisterReceiver(broadcastReceiver);
        }

        int time;

 public void runTimer(Intent intent){
        time = intent.getIntExtra("time", 0);
        int hour = time/3600;
        int mins = time / 60;
        int secs = time % 60;
        timer.setText(String.format(Locale.US,"%02d:%02d:%02d", hour, mins, secs));
    }

在TimerService

int counter;
     @Override
        public void onCreate() {
            super.onCreate();
        //set counter to value from sharedprefrences 
    }

private void DisplayLoggingInfo() {

        timeInMilliseconds = SystemClock.uptimeMillis() - initial_time;

        int timer = (int) timeInMilliseconds / 1000;
        intent.putExtra("time", timer+counter);
        sendBroadcast(intent);

    }