Question

有没有办法让活动记住计数，因为当你启动应用程序时，你点击随机生成可绘制图像的按钮，它不允许用户按下该按钮30秒..问题现在就是当你在等待计数器时转到0你可以轻松按下选项菜单，点击设置并点击“povratak”，它会重新开始活动并且计数器会丢失它的点，因为用户现在可以再次按下生成图像的按钮（我不想要那个）：/

MainActivity

    package com.example.ams;

import java.util.Random;



import android.os.Bundle;
import android.os.CountDownTimer;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;



public class MainActivity extends Activity {

    final Random rnd = new Random();
    ImageView img = null;
    Button btnRandom = null;






    @Override
    protected void onCreate(
        final Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        img = (ImageView) findViewById(R.id.imgRandom);
        btnRandom = (Button) findViewById(R.id.btnRandom);
    }



    protected final static int getResourceID
    (final String resName, final String resType, final Context ctx)
    {
        final int ResourceID =
            ctx.getResources().getIdentifier(resName, resType,
                ctx.getApplicationInfo().packageName);
        if (ResourceID == 0)
        {
            throw new IllegalArgumentException
            (
                "No resource string found with name " + resName
                );
        }
        else
        {
            return ResourceID;
        }
    }

    public void clickHandler(final View v)
    {
        switch(v.getId())
        {



        case R.id.btnRandom:
            {
                if (!btnRandom.isEnabled())
                {
                    return;
                }

                // I have 3 images named img_0 to img_2, so...
                final String str = "img_" + rnd.nextInt(45);
                img.setImageDrawable
                (
                    getResources().getDrawable(getResourceID(str, "drawable",
                        getApplicationContext()))
                );
                btnRandom.setEnabled(false);

                new CountDownTimer(30000, 1000) // Wait 30 secs, tick every 1 sec
                {
                    @Override
                    public final void onTick(final long millisUntilFinished)
                    {
                        btnRandom.setText("Pričekaj do sljedeće kartice: " + (millisUntilFinished / 1000));
                    }
                    @Override
                    public final void onFinish()
                    {
                        btnRandom.setText("PROMIJENI KARTICU !");
                        btnRandom.setEnabled(true);
                    }
                }.start();

                break;
            }


            }

        }




    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
            case R.id.action_settings:
                setContentView(R.layout.help);
                return true;
                    default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater=getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);

    }

    public void goBack(View v){
        startActivity(new Intent(this, MainActivity.class));
        }

    @Override
    public void onBackPressed() {
    }

}

activity_main.xml中

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:background="@drawable/bgi"
>
<ImageView
    android:id="@+id/imgRandom"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
/>

<Button
    android:id="@+id/btnRandom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/imgRandom"
    android:layout_alignParentBottom="true"
    android:layout_alignRight="@+id/imgRandom"
    android:onClick="clickHandler"
    android:text=" Promijeni karticu !"
    android:textColor="#ffffff"
    android:textSize="25dp" />

help.xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ScrollView
    android:id="@+id/SCROLLER_ID"
    android:layout_width="fill_parent"
    android:layout_height="450dp"
    android:fillViewport="true"
    android:scrollbars="vertical" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clickable="true"
    android:enabled="true"
    android:freezesText="false"
    android:overScrollMode="always"
    android:scrollbarAlwaysDrawVerticalTrack="true"
    android:scrollbarStyle="insideOverlay"
    android:scrollbars="vertical"
    android:text="UVOD:Uz svaki scenario organizator moze odrediti da se koristi &quot;AMS sustav&quot; zbog realnijeg pristupa igri i viseg stupnja MILSIM-a. Organizator bira medice (ili kako se vec odredi) i oni moraju imati prilikom pocetka igre 46 kartica. />


</ScrollView>

<Button
    android:id="@+id/button1"
    android:layout_width="320dp"
    android:layout_height="wrap_content"
    android:text="Povratak" />

如果有可能，请以代码格式告诉我你的答案，因为英语不是我的母语，而且我常常不明白你们的意思：）

Answer 1

您可以在onPause()方法内部执行SharedPreferences中计时器的当前值。当您的应用程序在onResume()中恢复时，您可以再次获取该值，如果它存在，则从该值开始。

Android，活动记住计数数据

1 个答案: