Android timer,Broadcast Receiver,

Question

Developing a timer application,

Have 4 buttons

start--Will start the timer

stop-- will stop timer

pause--will pause timer

lap time--will calculate lap time.

when button click it s working Good.

Now i am Modify the application like timer should start when phone is connected to charger and pause when phone is disconnected from charger.

The timer is starting fine when connected to the charger,

but during discharging the stop timer is not stopping at the accurate time it will be misplaced with some other time.i.e delay in minutes and seconds.

How to make the timer pause and show correct timer when disconnected from the charger...?

MainActivity.java

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MainActivity extends Activity {

    private static final String TAG ="Main Activity";
    TextView textView;
    Button start, pause, reset, lap;
    long MillisecondTime, StartTime, TimeBuff, UpdateTime = 0L;
    Handler handlerr;
    int Seconds, Minutes, MilliSeconds;
    ListView listView;
    String[] ListElements = new String[]{};
    List<String> ListElementsArrayList;
    ArrayAdapter<String> adapter;
    TextView textview;
    Button button;
    IntentFilter intentfilter;
    int deviceStatus;
    String currentBatteryStatus = "Battery Info";
    int batteryLevel;
    Handler handler;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textview = (TextView) findViewById(R.id.textViewBatteryStatus);



        intentfilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        MainActivity.this.registerReceiver(broadcastreceiver, intentfilter);



        textView = (TextView)findViewById(R.id.textView);
        start = (Button)findViewById(R.id.button);
        pause = (Button)findViewById(R.id.button2);
        reset = (Button)findViewById(R.id.button3);
        lap = (Button)findViewById(R.id.button4) ;
        listView = (ListView)findViewById(R.id.listview1);
        handler = new Handler() ;
        ListElementsArrayList = new ArrayList<String>(Arrays.asList(ListElements));
        adapter = new ArrayAdapter<String>(MainActivity.this,
                android.R.layout.simple_list_item_1,
                ListElementsArrayList
        );
        listView.setAdapter(adapter);
        start.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {

                StartTime = SystemClock.uptimeMillis();
                handler.postDelayed(runnable, 0);
                reset.setEnabled(false);


            }
        });

        pause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                TimeBuff += MillisecondTime;
                handler.removeCallbacks(runnable);
                reset.setEnabled(true);

            }
        });

        reset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                MillisecondTime = 0L ;
                StartTime = 0L ;
                TimeBuff = 0L ;
                UpdateTime = 0L ;
                Seconds = 0 ;
                Minutes = 0 ;
                MilliSeconds = 0 ;
                textView.setText("00:00:00");

                ListElementsArrayList.clear();

                adapter.notifyDataSetChanged();


            }
        });

        lap.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                ListElementsArrayList.add(textView.getText().toString());
                adapter.notifyDataSetChanged();

            }
        });

    }
    public Runnable runnable = new Runnable() {

        public void run() {

            MillisecondTime = SystemClock.uptimeMillis() - StartTime;
            UpdateTime = TimeBuff + MillisecondTime;
            Seconds = (int) (UpdateTime / 1000);
            Minutes = Seconds / 60;
            Seconds = Seconds % 60;
            MilliSeconds = (int) (UpdateTime % 1000);
            textView.setText("" + Minutes + ":"
                    + String.format("%02d", Seconds) + ":"
                    + String.format("%03d", MilliSeconds));
            handler.postDelayed(this, 0);
        }

    };

// Broadcasts receiver//

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

            deviceStatus = intent.getIntExtra(BatteryManager.EXTRA_STATUS,-1);
            int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
            int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
            int batteryLevel=(int)(((float)level / (float)scale) * 100.0f);

            if(deviceStatus == BatteryManager.BATTERY_STATUS_CHARGING){
                StartTime = SystemClock.uptimeMillis();
                handler.postDelayed(runnable, 0);
                reset.setEnabled(false);
                textview.setText(currentBatteryStatus+" = Charging at "+batteryLevel+" %");

            }

            if(deviceStatus == BatteryManager.BATTERY_STATUS_DISCHARGING){

                textview.setText(currentBatteryStatus+" = Discharging at "+batteryLevel+" %");

            }

            if (deviceStatus == BatteryManager.BATTERY_STATUS_FULL){

                textview.setText(currentBatteryStatus+"= Battery Full at "+batteryLevel+" %");

            }

            if(deviceStatus == BatteryManager.BATTERY_STATUS_UNKNOWN){

                textview.setText(currentBatteryStatus+" = Unknown at "+batteryLevel+" %");
            }


            if (deviceStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING){
                TimeBuff += MillisecondTime;
                handler.removeCallbacks(runnable);
                reset.setEnabled(true);
                textview.setText(currentBatteryStatus+" = Not Charging at "+batteryLevel+" %");

            }

        }
    };

}

activity_main.xml

<TextView
    android:text="00:00:00"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/textView"
    android:textSize="50dp"
    android:textStyle="bold"
    android:textColor="#009688"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

<Button
    android:text="Start"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="41dp"
    android:id="@+id/button" />

<Button
    android:text="Pause"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/button2"
    android:layout_alignBaseline="@+id/button"
    android:layout_alignBottom="@+id/button"
    android:layout_centerHorizontal="true" />

<Button
    android:text="Reset"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignTop="@+id/button2"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:id="@+id/button3" />

<Button
    android:text="Save Lap"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="24dp"
    android:id="@+id/button4"
    android:layout_below="@+id/button"
    android:layout_centerHorizontal="true" />

<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/button4"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="12dp"
    android:id="@+id/listview1"/>

<TextView
    android:id="@+id/textViewBatteryStatus"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignEnd="@+id/button2"
    android:layout_below="@+id/textView"
    android:text="Current Battery Status"
    android:textAppearance="?android:attr/textAppearanceLarge" />

Guidance in editing code will be helpful.

You haven't stated what is the problem you're having. "Some other time" is too general, I'm afraid. We will not be able to help if you don't investigate and say what specifically is wrong with your code. Also, most of it is not needed. Please edit so we have a [mcve]. — M. Prokhorov, Mar 20 '18 at 14:11
The timer likely doesn't stop at discarging because you *aren't stopping it at discharging*. You stop it at `NOT_CHARGING` status. You wrote your code this way. — M. Prokhorov, Mar 21 '18 at 12:04
@M.Prokhorov I also tried for discharging and NOT_CHARGING,but it didnt work. if(deviceStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING){ TimeBuff += MillisecondTime; handler.removeCallbacks(runnable); textview.setText(currentBatteryStatus+":not Charging at "+batteryLevel+" %"); } — Rahul Samanta, Mar 22 '18 at 06:54
"Did not work" doesn't say anything useful about your problem. — M. Prokhorov, Mar 22 '18 at 09:19

score 0 · Answer 1 · answered Mar 22 '18 at 18:46

If you want to catch the Charger Connected and Disconnected events, then you should not use the BATTERY_STATUS_CHARGING and BATTERY_STATUS_DISCHARGING at the first place.You should listen for -

<receiver android:name=".YourPowerConnectionReceiver">
  <intent-filter>
    <action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
    <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>
  </intent-filter>
</receiver>

Thus you will get the broadcast only during charger connected and disconnected state.

Look here : https://developer.android.com/reference/android/content/Intent.html#ACTION_BATTERY_CHANGED

Android timer,Broadcast Receiver,

1 Answers1