Android定时器，广播接收器，答案

【问题标题】：Android timer,Broadcast Receiver,Android定时器，广播接收器，
【发布时间】：2018-08-29 08:13:42
【问题描述】：

开发一个定时器应用，

有 4 个按钮

start--将启动计时器

stop-- 将停止计时器

pause--将暂停计时器

单圈时间--将计算单圈时间。

当按钮点击它工作良好。

现在我正在修改应用程序，例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连接时暂停。

连接到充电器后计时器开始正常，

但在放电过程中，停止计时器不会在准确的时间停止，它会与其他时间错位。即延迟分钟和秒。

如何让定时器暂停并在与充电器断开连接时显示正确的定时器...？

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" />

编辑代码的指导会很有帮助。

【问题讨论】：

您还没有说明您遇到的问题是什么。恐怕“其他时间”太笼统了。如果您不调查并说出您的代码具体有什么问题，我们将无法提供帮助。此外，大部分都不需要。请编辑以便我们有一个minimal reproducible example。
不过，您的问题还不清楚。试试更简单的句子？
@AmitK.Saha，其编辑请参阅
@M.Prokhorov 其编辑请参阅
计时器可能不会在卸料时停止，因为您没有在卸料时停止。您将其停止在NOT_CHARGING 状态。你是这样写代码的。

标签： android timer android-broadcast android-broadcastreceiver android-handler

【解决方案1】：

如果你想捕捉 Charger Connected 和 Disconnected 事件，那么你不应该首先使用BATTERY_STATUS_CHARGING 和BATTERY_STATUS_DISCHARGING。你应该监听 -

<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>

因此您只会在充电器连接和断开状态下获得广播。

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

【讨论】：