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如何在 Android 测验上实现计时器?

Java问题
2022-01-01

How to Implement Timer on Android quiz?(如何在 Android 测验上实现计时器?)

本文介绍了如何在 Android 测验上实现计时器?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

I am working on Android quiz .I wanted to add timer on ImageView In Question XML , I want to call the CountDownTimer from Welcome XML on Play button. I just set the onClick in Question xml by adding a line like this in ImageView

In Question XML

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/question"
    android:layout_centerHorizontal="true"
    android:background="@drawable/timer_bttn" 
    android:onClick="onClick"/>

In Welcome xml

<Button 
            android:text="Play" 
            android:id="@+id/playBtn"
            android:layout_width="80dip" 
            android:layout_alignParentRight="true"
            android:layout_height="wrap_content"
            android:paddingTop="5dip" 
            android:paddingBottom="5dip"
            android:textColor="#ffffff"
            android:background="@drawable/start_button" />

then i created TimerActivity

    public class TimerActivity extends Activity implements OnClickListener {

private Button startB;
public TextView text;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.question);
startB = (Button) this.findViewById(R.id.playBtn);
startB.setOnClickListener((OnClickListener) this);
text = (TextView) findViewById(R.id.textView1);
}

@Override
public void onClick(View v) {
    new CountDownTimer(30000, 1000) { // adjust the milli seconds here

        public void onTick(long millisUntilFinished) {
        text.setText(""+String.format("%d min, %d sec", 
                        TimeUnit.MILLISECONDS.toMinutes( millisUntilFinished),
                        TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - 
                        TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
        }

        public void onFinish() {
           text.setText("done!");
        }
     }.start();

}   
}

In this code I have just written code of timer to call on Image and implement code in TimerActivity. but My Timer not get started when I click a play button.Where My Play button is working in Different Activity.so can any one help me How to call Timer In different XML.

My logCat:-

!ENTRY org.eclipse.ui 4 0 2013-09-02 17:19:38.741
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.IllegalArgumentException: Widget has the wrong parent
    at org.eclipse.swt.SWT.error(SWT.java:4342)
    at org.eclipse.swt.SWT.error(SWT.java:4276)
    at org.eclipse.swt.SWT.error(SWT.java:4247)
    at org.eclipse.swt.widgets.Widget.error(Widget.java:468)
    at org.eclipse.swt.widgets.Control.setMenu(Control.java:3462)
    at com.android.ddmuilib.logcat.LogCatPanel$20.handleEvent(LogCatPanel.java:1042)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
    at org.eclipse.swt.widgets.Widget.showMenu(Widget.java:1472)
    at org.eclipse.swt.widgets.Widget.wmContextMenu(Widget.java:1574)
    at org.eclipse.swt.widgets.Control.WM_CONTEXTMENU(Control.java:4673)
    at org.eclipse.swt.widgets.Table.WM_CONTEXTMENU(Table.java:5972)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4532)
    at org.eclipse.swt.widgets.Table.windowProc(Table.java:5913)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4989)
    at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
    at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2440)
    at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:564)
    at org.eclipse.swt.widgets.Table.callWindowProc(Table.java:430)
    at org.eclipse.swt.widgets.Widget.wmRButtonUp(Widget.java:2395)
    at org.eclipse.swt.widgets.Control.WM_RBUTTONUP(Control.java:5134)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4596)
    at org.eclipse.swt.widgets.Table.windowProc(Table.java:5913)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4989)
    at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
    at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2546)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3756)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1053)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:942)
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

Thank's in advance

解决方案

I don't see anything wrong with your timer implementation

But you have this

 text = (TextView) this.findViewById(R.id.button1);

And you have this

   <ImageView
android:id="@+id/button1"

So it should be

 <TextView
android:id="@+id/textView1"

And

text = (TextView) findViewById(R.id.textView1);

Try the below. On click of the button timer starts. 

public class MainActivity extends Activity implements OnClickListener {

private Button startB;
public TextView text;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startB = (Button) this.findViewById(R.id.button1);
startB.setOnClickListener((OnClickListener) this);
text = (TextView) findViewById(R.id.textView1);
}

@Override
public void onClick(View v) {
    new CountDownTimer(30000, 1000) { // adjust the milli seconds here

        public void onTick(long millisUntilFinished) {
        text.setText(""+String.format("%d min, %d sec", 
                        TimeUnit.MILLISECONDS.toMinutes( millisUntilFinished),
                        TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - 
                        TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
        }

        public void onFinish() {
           text.setText("done!");
        }
     }.start();

}   
}

Check this link

For Java versions below 1.5 or for systems that do not fully support the TimeUnit class the following equations can be used:

int seconds = (int) (milliseconds / 1000) % 60 ;
int minutes = (int) ((milliseconds / (1000*60)) % 60);
int hours   = (int) ((milliseconds / (1000*60*60)) % 24);

Edit:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="35dp"
        android:text="TextView" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="68dp"
        android:text="Button" />

</RelativeLayout>

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本文标题为：如何在 Android 测验上实现计时器?

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