Question

开发计时器应用程序

有4个按钮

开始 - 将启动计时器

停止 - 将停止计时器

暂停 - 将暂停计时器

单圈时间 - 将计算单圈时间。

当按钮点击它时工作正常。

现在我修改应用程序，如计时器应该在手机连接到充电器时启动，并在手机与充电器断开时暂停。

连接充电器时，计时器正常启动

但在放电期间，停止计时器没有在准确的时间停止，它会被其他时间错位。即延迟分钟和秒。

如何在与充电器断开连接时使定时器暂停并显示正确的定时器...？

MainActivity.java

switch (y) {
    case 0:
         $('slpage').style.height = '0px';
        break;
    case 1:        
    case 2:
        $('slpage').style.height = '70px';
        break;
    case 3:
    case 4:
        $('slpage').style.height = '140px';
        break;
    case 5:
    default:
        $('slpage').style.height = '210px';
}

activity_main.xml中

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+" %");

            }

        }
    };

}

编辑代码的指导会很有帮助。

Answer 1

如果你想捕捉Charger Connected和Disconnected事件，那么你不应该在第一时间使用BATTERY_STATUS_CHARGING和BATTERY_STATUS_DISCHARGING。你应该听 -

<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>

因此，只有在充电器连接和断开状态下才能进行广播。

请看这里：https://developer.android.com/reference/android/content/Intent.html#ACTION_BATTERY_CHANGED

Android计时器，广播接收器，

1 个答案: