如何在Android测验中实现计时器？
我正在进行Android测验。我想在Question XML上的ImageView上添加计时器，我想在Play按钮上从CountDownTimer调用Welcome XML。我只是在onClick中设置了Question xml，在ImageView中添加了这样的一行
问题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"/>
欢迎使用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" />
然后我创建了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();
}
}
在这段代码中，我刚刚编写了定时器代码来调用Image并在TimerActivity中实现代码。但是当我单击播放按钮时，我的计时器无法启动。我的播放按钮在不同的活动中工作。任何人都可以帮助我如何在不同的XML中调用计时器。
我的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)
提前感谢
2 个答案:
答案 0 :(得分：1)
我没看到你的计时器实现有什么问题
但你有这个
text = (TextView) this.findViewById(R.id.button1);
你有这个
<ImageView
android:id="@+id/button1"
所以它应该是
<TextView
android:id="@+id/textView1"
和
text = (TextView) findViewById(R.id.textView1);
尝试以下方法。点击按钮计时器启动。
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();
}
}
检查此链接
对于低于1.5的Java版本或对于不完全支持TimeUnit类的系统，可以使用以下等式：
int seconds = (int) (milliseconds / 1000) % 60 ;
int minutes = (int) ((milliseconds / (1000*60)) % 60);
int hours = (int) ((milliseconds / (1000*60*60)) % 24);
编辑：
<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>
答案 1 :(得分：0)
您应该尝试使用以下代码。
private void setTimer() {
counterTimer = new CountDownTimer(finishTime * 1000, 1000) {
public void onFinish() {
//code to execute when time finished
}
public void onTick(long millisUntilFinished) {
int seconds = (int) (millisUntilFinished / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
if (seconds < 10) {
txtTimer.setText("" + minutes + ":0" + seconds);
} else {
txtTimer.setText("" + minutes + ":" + seconds);
}
}
};
counterTimer.start();
}
此处examFinishTime是一个很长的值，如
private long finishTime = 5;
注意：参数以毫秒为单位。
要启动计时器，只需在任何按钮的点击事件中调用setTimer()方法。
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