Hello,guys!
I encountered a problem while I run the application below.The UI can
appear in the emulator screen normally,but while I click the button
the bug appears.Below I attach the source and the logcat:
the source code:
HelloDatePicker.java
package HelloDatePicker.pkg;
import java.util.Calendar;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
public class HelloDatePickerAct extends Activity {
/** Called when the activity is first created. */
private TextView mDateDisplay;
private Button mPickDate;
private int mYear;
private int mMonth;
private int mDay;
static final int DATE_DIALOG_ID=0x00000000;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//capture our View elements
mDateDisplay=(TextView)findViewById(R.id.DateDisplay);
mPickDate=(Button)findViewById(R.id.PickDate);
//get the current date
final Calendar c=Calendar.getInstance();
mYear=c.get(Calendar.YEAR);
mMonth=c.get(Calendar.MONTH);
mDay=c.get(Calendar.DAY_OF_MONTH);
//display the current date
updateDisplay();
//add a click listener to the button
mPickDate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showDialog(DATE_DIALOG_ID);
}
});
}
protected Dialog OnCreateDialog(int id){
switch(id){
case DATE_DIALOG_ID:
return new DatePickerDialog
(this,mDateSetListener,mYear,mMonth,mDay);
}
return null;
}
//updates the date we display in the TextView
private void updateDisplay()
{
mDateDisplay.setText(new StringBuilder()
//Month is 0 based so add 1
.append(mMonth+1).append("-")
.append(mDay).append("-")
.append(mYear).append(" "));
}
// the callback received when the user "sets" the date in the dialog
private DatePickerDialog.OnDateSetListener mDateSetListener =
new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth)
{
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateDisplay();
}
};
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android";
android:orientation="vertical">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/DateDisplay"
android:editable="false"></TextView>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/PickDate"
android:text="Change the date" android:clickable="false"></Button>
</LinearLayout>
I debug step by step and while debugging at the breakpoint
onClick,the logcat appears as below:
11-04 01:15:03.152: ERROR/AndroidRuntime(809): Uncaught handler:
thread main exiting due to uncaught exception
11-04 01:15:03.180: ERROR/AndroidRuntime(809):
java.lang.IllegalArgumentException: Activity#onCreateDialog did not
create a dialog for id 0
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.app.Activity.createDialog(Activity.java:869)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.app.Activity.showDialog(Activity.java:2408)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
HelloDatePicker.pkg.HelloDatePickerAct$2.onClick
(HelloDatePickerAct.java:49)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.View.performClick(View.java:2344)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.View.onTouchEvent(View.java:4133)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.widget.TextView.onTouchEvent(TextView.java:6504)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.View.dispatchTouchEvent(View.java:3672)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
com.android.internal.policy.impl.PhoneWindow
$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent
(PhoneWindow.java:1202)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.app.Activity.dispatchTouchEvent(Activity.java:1987)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
com.android.internal.policy.impl.PhoneWindow
$DecorView.dispatchTouchEvent(PhoneWindow.java:1696)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.view.ViewRoot.handleMessage(ViewRoot.java:1658)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.os.Handler.dispatchMessage(Handler.java:99)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.os.Looper.loop(Looper.java:123)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
android.app.ActivityThread.main(ActivityThread.java:4203)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
java.lang.reflect.Method.invokeNative(Native Method)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
java.lang.reflect.Method.invoke(Method.java:521)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
(ZygoteInit.java:791)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
11-04 01:15:03.180: ERROR/AndroidRuntime(809): at
dalvik.system.NativeStart.main(Native Method)
11-04 01:15:03.220: ERROR/dalvikvm(809): Unable to open stack trace
file '/data/anr/traces.txt': Permission denied
>From the logcat,I guess it is the ID problem,but I don't know how to
use it correctly and I can't get any help from the sdk docs,please
help!
I have another question about '11-04 01:15:03.220: ERROR/dalvikvm
(809): Unable to open stack trace file '/data/anr/traces.txt':
Permission denied' ,how to do with it?
3Q!
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