计算工作时间和现金

时间：2015-09-01 16:47:19

标签： java android

我想计算工作时间和赚取的现金（假设每小时20 ILS - 这就是为什么我在我的申请中乘以20的原因。）

我使用SharedPreferences所以我可以从应用程序中退出，它仍然会记得当我按下开始按钮时，我也在使用Calendar.getInstance()但是当我得到我正在使用的时间时小时格式，所以我不会有计算工作时间的问题（如果我在早上8点开始并且在晚上9点结束，工作时间将完成减去开始，9-8和那个小时，所以这将是错误的）。

我在开始时使用了INTs，但由于你无法在INTs工作0.3小时，因此我将工作时间缩短为零，我会将其切换为零，但我更改为Doubles但令人惊讶的是getDouble中没有putDouble或SharedPreferences，因此我切换到Floats但我现在收到错误，我的应用程序崩溃了。

这是我的代码： 

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    prefs = getSharedPreferences("myPrefsKey", 0);
    textView = (TextView) findViewById(R.id.textView);
    buttonStart = (Button) findViewById(R.id.start);
    buttonStart.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            Log.d(TAG, "onClick: starting");
            c = Calendar.getInstance();
            begmin = c.get(Calendar.MINUTE);
            beghour = c.get(Calendar.HOUR_OF_DAY);
            SharedPreferences.Editor edit = prefs.edit();
            edit.putInt("key1", begmin);
            edit.putInt("key2", beghour);
        }
    });
    buttonStop = (Button) findViewById(R.id.stop);
    buttonStop.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            Log.d(TAG, "onClick: stopping");
            Calendar c = Calendar.getInstance();
            finmin = c.get(Calendar.MINUTE);
            finhour = c.get(Calendar.HOUR_OF_DAY);
            if (finhour >= beghour)
                workhour = finhour - beghour;
            else
                workhour = 12 - beghour + finhour;
            workmin = finmin - begmin;
            hourcashto = (float)(workhour * 20);
            mincashto = (float)(20 * (workmin / 60));
            cashto = hourcashto + mincashto;
            cash = prefs.getFloat("key", 0);
            cash = cash + cashto;
            SharedPreferences.Editor edit = prefs.edit();
            edit.putFloat("key", cash);
            edit.commit();
            textView.setText("cash now: " + cashto + " cash total including today: " + cash + " \n" + "Time today: " + workhour + ":" + workmin);
        }
    });
}

以下是Logcat输出： 

09-01 19:44:19.811  17344-17344/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: firstappdevelopment.work, PID: 17344
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Float
        at android.app.SharedPreferencesImpl.getFloat(SharedPreferencesImpl.java:253)
        at firstappdevelopment.work.MainActivity$2.onClick(MainActivity.java:57)
        at android.view.View.performClick(View.java:5254)
        at android.view.View$PerformClick.run(View.java:21179)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:145)
        at android.app.ActivityThread.main(ActivityThread.java:6837)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
        at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:115)

我很抱歉，如果它是半个logcat，我用了搜索＆＃34; MainActivity＆＃34;因为在Android Studio Logcat中有自动滚动，我无法进行崩溃和复制。第MainActivity.java:57 refers to:行

cash = prefs.getFloat("key", 0);

根据我的理解，它说现金是int，但看看我的构造函数（？）：

    private static final String TAG = "ServicesDemo";
private Button buttonStart, buttonStop;
private int begmin, beghour, finmin, finhour, workhour, workmin;
private float cash, cashto, hourcashto, mincashto;
private Calendar c;
private TextView textView;
private SharedPreferences prefs;

谢谢大家的帮助。

编辑，完整代码+ XML 

    package firstappdevelopment.work;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Calendar;

     public class MainActivity extends Activity {
    private static final String TAG = "ServicesDemo";
    private Button buttonStart, buttonStop;
    private int begmin, beghour, finmin, finhour, workhour, workmin;
    private float cash, cashto, hourcashto, mincashto;
    private Calendar c;
    private TextView textView;
    private SharedPreferences prefs;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        prefs = getSharedPreferences("myPrefsKey", 0);
        textView = (TextView) findViewById(R.id.textView);
        buttonStart = (Button) findViewById(R.id.start);
        buttonStart.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Log.d(TAG, "onClick: starting");
                c = Calendar.getInstance();
                begmin = c.get(Calendar.MINUTE);
                beghour = c.get(Calendar.HOUR_OF_DAY);
                SharedPreferences.Editor edit = prefs.edit();
                edit.putInt("key1", begmin);
                edit.putInt("key2", beghour);
            }
        });
        buttonStop = (Button) findViewById(R.id.stop);
        buttonStop.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Log.d(TAG, "onClick: stopping");
                Calendar c = Calendar.getInstance();
                finmin = c.get(Calendar.MINUTE);
                finhour = c.get(Calendar.HOUR_OF_DAY);
                if (finhour >= beghour)
                    workhour = finhour - beghour;
                else
                    workhour = 12 - beghour + finhour;
                workmin = finmin - begmin;
                hourcashto = (float)(workhour * 20);
                mincashto = (float)(20 * (workmin / 60));
                cashto = hourcashto + mincashto;
                cash = prefs.getFloat("key", 0f);
                cash = cash + cashto;
                SharedPreferences.Editor edit = prefs.edit();
                edit.putFloat("key", cash);
                edit.commit();
                textView.setText("cash now: " + cashto + " cash total including today: " + cash + " \n" + "Time today: " + workhour + ":" + workmin);
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

XML：

 <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">

    <Button
        android:id="@+id/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="START"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Total:"
        android:layout_alignTop="@+id/stop"
        android:layout_toRightOf="@+id/stop"
        android:layout_toEndOf="@+id/stop"
       />

    <Button
        android:id="@+id/stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="STOP"
        android:layout_alignTop="@+id/start"
        android:layout_toRightOf="@+id/start"
        android:layout_toEndOf="@+id/start" />

     </RelativeLayout>

4 个答案:

答案 0 :(得分：1)

因此，从您收到的错误ClassCastException开始，如果该值不存在，则您尝试从0传递默认值SharedPreferences。

将cash = prefs.getFloat("key", 0)更改为cash = prefs.getFloat("key", 0.0)

答案 1 :(得分：1)

因为你有这个例外：

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Float

你的问题在这里：

cash = prefs.getFloat("key", 0);

必须是：

cash = prefs.getFloat("key", 0.0f);

或者你的变量cash可能定义为int！你必须改为：

float cash;

有关getFloat()方法的更多信息。

答案 2 :(得分：-1)

这种情况正在发生，因为在prefs = getSharedPreferences("myPrefsKey", 0); 0中是一个int。使用0.0将解决问题，因为它是一个浮点数。更正代码 - 

  @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    prefs = getSharedPreferences("myPrefsKey", 0.0); // CODE CHANGED HERE
    textView = (TextView) findViewById(R.id.textView);
    buttonStart = (Button) findViewById(R.id.start);
    buttonStart.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            Log.d(TAG, "onClick: starting");
            c = Calendar.getInstance();
            begmin = c.get(Calendar.MINUTE);
            beghour = c.get(Calendar.HOUR_OF_DAY);
            SharedPreferences.Editor edit = prefs.edit();
            edit.putInt("key1", begmin);
            edit.putInt("key2", beghour);
        }
    });
    buttonStop = (Button) findViewById(R.id.stop);
    buttonStop.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            Log.d(TAG, "onClick: stopping");
            Calendar c = Calendar.getInstance();
            finmin = c.get(Calendar.MINUTE);
            finhour = c.get(Calendar.HOUR_OF_DAY);
            if (finhour >= beghour)
                workhour = finhour - beghour;
            else
                workhour = 12 - beghour + finhour;
            workmin = finmin - begmin;
            hourcashto = (float)(workhour * 20);
            mincashto = (float)(20 * (workmin / 60));
            cashto = hourcashto + mincashto;
            cash = prefs.getFloat("key", 0);
            cash = cash + cashto;
            SharedPreferences.Editor edit = prefs.edit();
            edit.putFloat("key", cash);
            edit.commit();
            textView.setText("cash now: " + cashto + " cash total including today: " + cash + " \n" + "Time today: " + workhour + ":" + workmin);
        }
    });
}

答案 3 :(得分：-1)

所以你知道问题在这里：

cash = prefs.getFloat("key", 0)

我认为您的代码很好！ 但是，正如您所说，您最初在“key”的共享首选项中存储了一些整数值。你删除了这些值吗？ 我建议您尝试将cash = prefs.getFloat("key", 0)更改为cash = prefs.getFloat("key_new", 0)。这可能是你忽略的愚蠢问题！

注意，如果cash = prefs.getFloat("key_new", 0)中存在0或0f或0.0f的问题，则会出现编译时错误。

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