问题描述

如果可能，请在答案中分享代码 这是我的代码，基本上我认为我的应用程序在一段时间后没有响应，可能是因为冻结的 gui 和高内存使用率，它在后台使用甚至 16.8 MB 的内存。请分享一些技巧，通过这些技巧我可以使我的应用程序简单快速而不会丢失功能。

秒表.java

package com.study.meter;

import android.app.Service;
import android.os.IBinder;
import android.content.Intent;
import android.widget.Toast;
import android.os.Handler;
import java.util.Locale;
import android.app.PendingIntent;
import androidx.core.app.NotificationCompat;
import android.app.NotificationManager;
import android.app.Notification;
import android.content.Context;

public class StopWatch extends Service{
    public static StopWatch getStopWatch;
    public static int StopWatchSecs;
    public static boolean isStopWatchRunning = false;
    public static boolean isRunning;
    public String StopWatchTime;

    private NotificationCompat.Builder builder;
    private Intent notificationIntent;
    private PendingIntent contentIntent;
    private Notification notificaton;
    private NotificationManager manager;
    private String StopWatchNotificationText,StopWatchNotificationTitle;

    @Override
    public int onStartCommand (Intent intent, int flags, int startId)
    {
        return START_CONTINUATION_MASK;

    }
    
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        getStopWatch = this;
    }

    @Override
    public void onDestroy() {
        isRunning = false;
        Toast.makeText(getBaseContext(),"Destroyed",Toast.LENGTH_SHORT).show();
        super.onDestroy();
    }

    @Override
    public void onStart(Intent intent, int startid) {
        super.onStart(intent,startid);
        isRunning = true;

    }

    public Handler StopWatchHandler = new Handler();
    public Runnable StopWatchRunnable = new Runnable()
    {
        @Override
        public void run()
        {
            StopWatchSecs++;
            
            int seconds = StopWatchSecs;
            int hours = seconds / 3600;
            int minutes = (seconds % 3600) / 60;
            int secs = seconds % 60;

            // Format the seconds into hours, minutes,
            // and seconds.
            StopWatchTime
                = String
                      .format(Locale.getDefault(),
                              "%d:%02d:%02d", hours,
                              minutes, secs);

            // if app is running then change counting
            if(MainActivity.Stop_Watch!=null && MainActivity.isAppRunning)
            {
                // Set the text view text.
                MainActivity.Stop_Watch.setText(StopWatchTime);
            }
            addStopWatchNotification("StopWatch",StopWatchTime);
            StopWatchHandler.postDelayed(StopWatchRunnable,1000);
        }
    };

    public void Start_Watch()
    {
        StopWatchHandler.post(StopWatchRunnable);
    }
    public void Stop_Watch()
    {
        StopWatchHandler.removeCallbacks(StopWatchRunnable);
    }
    public String Start_Or_Stop_Watch()
    {
        String result = "Start";
        if(isStopWatchRunning)
        {
            result = "Resume";
            isStopWatchRunning = false;
            Stop_Watch();
        }
        else if(!isStopWatchRunning)
        {
            result = "Pause";
            isStopWatchRunning = true;
            Start_Watch();
        }
        return result;
    }

    // adding new Handler for notifications to not overload memory
    public Handler StopWatchNotificationHandler = new Handler();
    public Runnable StopWatchNotificationRunnable;


   public void addStopWatchNotification(String title,String text)
   {
    if(builder==null)
    {
        builder = new NotificationCompat.Builder(this);
        builder
            .setSmallIcon(R.drawable.notify_icon)
            .setAutoCancel(false)
            .setOnlyAlertOnce(true);
    }
    if(notificationIntent==null)
    {
        notificationIntent = new Intent(this, MainActivity.class);
    }
    if(contentIntent==null)
    {
        contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(contentIntent);
    }
   

    if(manager==null)
    {
        manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);   
    }
    if(StopWatchNotificationRunnable==null)
    {
        StopWatchNotificationRunnable = new Runnable()
        {
            @Override
            public void run()
            {
                builder
                    .setContentTitle(title)
                    .setContentText(text);

                notificaton = builder.build();
                notificaton.flags |= Notification.FLAG_NO_CLEAR;
                manager.notify(0, notificaton);
            }
        };
    }
    StopWatchNotificationText = text;
    StopWatchNotificationTitle = title;
    StopWatchNotificationHandler.post(StopWatchNotificationRunnable);
    }
}

MainActivity.java

package com.study.meter;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.content.Context;



public class MainActivity extends AppCompatActivity
{
    public static boolean isAppRunning;
    public static TextView Stop_Watch;
    public static MainActivity activity;
    public Button Start_Watch;
    
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        
        // set content view
        setContentView(R.layout.activity_main);

        // hide statusbar
        getSupportActionBar().hide();

        activity = this;
        
        // set the value of StopWatch
        Stop_Watch = findViewById(R.id.StopWatch);
        Start_Watch = findViewById(R.id.StartWatch);

        //if StopWatch service is not running 
        if(!StopWatch.isRunning)
        {
            // start the service
            startService(new Intent(this, StopWatch.class));
        }
    }
    @Override
    public void onResume()
    {
        super.onResume();
        isAppRunning = true;

        if(StopWatch.StopWatchSecs!=0)
        {
            // if stopwatchsecs is not equal to null or 0
            if(StopWatch.isStopWatchRunning)
            {
                // if stopwatch is running in background
                Start_Watch.setText("Pause");
            }else
            {
                // if stopwatch is not running in background
                Start_Watch.setText("Resume");
            }
        }
    }
    @Override
    public void onPause()
    {
        isAppRunning = false;
        super.onPause();
    }

    // "StartWatch" click
    public void StartorStop(View v)
    {
        Button sv = (Button)v;
        String StartWatchText = StopWatch.getStopWatch.Start_Or_Stop_Watch();
        sv.setText(StartWatchText);
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.study.meter"
    android:installLocation="auto">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.StudyMeter">
        <service
            android:name=".StopWatch"
            android:stopWithTask="false"/>
        <activity android:name=".MainActivity"
            android:configChanges="orientation|screenSize|screenLayout">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
    tools:context=".MainActivity">

    <TextView
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:id="@+id/StopWatch"
        android:textSize="65dp"
        android:text="0:00:00"
        app:layout_constraintBottom_toTopOf="@id/StartWatch"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    <Button
        android:layout_height="50dp"
        android:layout_width="wrap_content"
        android:id="@+id/StartWatch"
        android:text="Start"
        android:onClick="StartorStop"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/StopWatch"/>

</androidx.constraintlayout.widget.ConstraintLayout>

标签： javaandroidxml

java - 我的 android 应用程序占用大量内存并停止响应

问题描述

秒表.java

MainActivity.java

AndroidManifest.xml

activity_main.xml

解决方案

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