我试图通过“ManagerDashboard.class”中的按钮单击事件启动“ CalendarView.class ” ，但在按钮单击期间应用程序崩溃。如果我将 CalendarView.class 作为清单中的主要活动，CalendarView.class将成功启动。
我试图浏览类似的问题，但没有找到我正在寻找的答案。
日志输出：
09-09 09:54:02.496: E/AndroidRuntime(1645): FATAL EXCEPTION: main
09-09 09:54:02.496: E/AndroidRuntime(1645): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.demi.attendance/android.widget.CalendarView}; have you declared this activity in your AndroidManifest.xml?
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1618)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.app.Activity.startActivityForResult(Activity.java:3370)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.app.Activity.startActivityForResult(Activity.java:3331)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.app.Activity.startActivity(Activity.java:3566)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.app.Activity.startActivity(Activity.java:3534)
09-09 09:54:02.496: E/AndroidRuntime(1645): at com.demi.manager.ManagerDashboard$1.onClick(ManagerDashboard.java:42)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.view.View.performClick(View.java:4204)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.view.View$PerformClick.run(View.java:17355)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.os.Handler.handleCallback(Handler.java:725)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.os.Handler.dispatchMessage(Handler.java:92)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.os.Looper.loop(Looper.java:137)
09-09 09:54:02.496: E/AndroidRuntime(1645): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-09 09:54:02.496: E/AndroidRuntime(1645): at java.lang.reflect.Method.invokeNative(Native Method)
09-09 09:54:02.496: E/AndroidRuntime(1645): at java.lang.reflect.Method.invoke(Method.java:511)
09-09 09:54:02.496: E/AndroidRuntime(1645): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-09 09:54:02.496: E/AndroidRuntime(1645): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-09 09:54:02.496: E/AndroidRuntime(1645): at dalvik.system.NativeStart.main(Native Method)
09-09 10:21:59.325: E/Trace(2139): error opening trace file: No such file or directory (2)
显现：
<application
android:allowBackup="true"
android:icon="@drawable/mainicon"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:uiOptions="splitActionBarWhenNarrow"
android:vmSafeMode="true" >
<activity
android:name="com.demi.manager.ManagerDashboard"
android:configChanges="orientation"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.demi.calendar.CalendarView"
android:configChanges="orientation"
android:screenOrientation="portrait" >
</activity>
</application>
日历视图.java
package com.demi.calendar;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.GregorianCalendar;
import java.util.Locale;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.demi.attendance.R;
public class CalendarView extends Activity {
public GregorianCalendar month, itemmonth;// calendar instances.
public CalendarAdapter adapter;// adapter instance
public Handler handler;// for grabbing some event values for showing the dot
// marker.
public ArrayList<String> items; // container to store calendar items which
// needs showing the event marker
ArrayList<String> event;
LinearLayout rLayout;
ArrayList<String> date;
ArrayList<String> desc;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.calendar);
Locale.setDefault(Locale.US);
rLayout = (LinearLayout) findViewById(R.id.text);
month = (GregorianCalendar) GregorianCalendar.getInstance();
//itemmonth = (GregorianCalendar) month.clone();
items = new ArrayList<String>();
adapter = new CalendarAdapter(this, month);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(adapter);
handler = new Handler();
handler.post(calendarUpdater);
TextView title = (TextView) findViewById(R.id.title);
title.setText(android.text.format.DateFormat.format("MMMM yyyy", month));
RelativeLayout previous = (RelativeLayout) findViewById(R.id.previous);
previous.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setPreviousMonth();
refreshCalendar();
}
});
RelativeLayout next = (RelativeLayout) findViewById(R.id.next);
next.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setNextMonth();
refreshCalendar();
}
});
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// removing the previous view if added
if (((LinearLayout) rLayout).getChildCount() > 0) {
((LinearLayout) rLayout).removeAllViews();
}
desc = new ArrayList<String>();
date = new ArrayList<String>();
((CalendarAdapter) parent.getAdapter()).setSelected(v);
String selectedGridDate = CalendarAdapter.dayString
.get(position);
String[] separatedTime = selectedGridDate.split("-");
String gridvalueString = separatedTime[2].replaceFirst("^0*",
"");// taking last part of date. ie; 2 from 2012-12-02.
int gridvalue = Integer.parseInt(gridvalueString);
// navigate to next or previous month on clicking offdays.
if ((gridvalue > 10) && (position < 8)) {
setPreviousMonth();
refreshCalendar();
} else if ((gridvalue < 7) && (position > 28)) {
setNextMonth();
refreshCalendar();
}
((CalendarAdapter) parent.getAdapter()).setSelected(v);
for (int i = 0; i < Utility.startDates.size(); i++) {
if (Utility.startDates.get(i).equals(selectedGridDate)) {
desc.add(Utility.nameOfEvent.get(i));
}
}
if (desc.size() > 0) {
for (int i = 0; i < desc.size(); i++) {
TextView rowTextView = new TextView(CalendarView.this);
// set some properties of rowTextView or something
rowTextView.setText("Event:" + desc.get(i));
rowTextView.setTextColor(Color.BLACK);
// add the textview to the linearlayout
rLayout.addView(rowTextView);
}
}
desc = null;
}
});
}
protected void setNextMonth() {
if (month.get(GregorianCalendar.MONTH) == month
.getActualMaximum(GregorianCalendar.MONTH)) {
month.set((month.get(GregorianCalendar.YEAR) + 1),
month.getActualMinimum(GregorianCalendar.MONTH), 1);
} else {
month.set(GregorianCalendar.MONTH,
month.get(GregorianCalendar.MONTH) + 1);
}
}
protected void setPreviousMonth() {
if (month.get(GregorianCalendar.MONTH) == month
.getActualMinimum(GregorianCalendar.MONTH)) {
month.set((month.get(GregorianCalendar.YEAR) - 1),
month.getActualMaximum(GregorianCalendar.MONTH), 1);
} else {
month.set(GregorianCalendar.MONTH,
month.get(GregorianCalendar.MONTH) - 1);
}
}
protected void showToast(String string) {
Toast.makeText(this, string, Toast.LENGTH_SHORT).show();
}
public void refreshCalendar() {
TextView title = (TextView) findViewById(R.id.title);
adapter.refreshDays();
adapter.notifyDataSetChanged();
handler.post(calendarUpdater); // generate some calendar items
title.setText(android.text.format.DateFormat.format("MMMM yyyy", month));
}
public Runnable calendarUpdater = new Runnable() {
@Override
public void run() {
items.clear();
// Print dates of the current week
DateFormat df = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
String itemvalue;
/// = Utility.readCalendarEvent(CalendarView.this);
//Log.d("=====Event====", event.toString());
Log.d("=====Date ARRAY====", Utility.startDates.toString());
/*for (int i = 0; i < Utility.startDates.size(); i++) {
itemvalue = df.format(itemmonth.getTime());
itemmonth.add(GregorianCalendar.DATE, 1);
items.add(Utility.startDates.get(i).toString());
}*/
adapter.setItems(items);
adapter.notifyDataSetChanged();
}
};
}
ManagerDashboard.java
public class ManagerDashboard extends Activity {
Button create_project, view_project;
Button take_attendance, view_attendance;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.manager_dashboard);
init();
setListener();
}
void init() {
take_attendance = (Button) findViewById(R.id.manager_dashboard_button1);
view_attendance = (Button) findViewById(R.id.manager_dashboard_button2);
create_project = (Button) findViewById(R.id.manager_dashboard_button3);
view_project = (Button) findViewById(R.id.manager_dashboard_button4);
}
void setListener() {
take_attendance.setOnClickListener(new OnClickListener() {
@SuppressLint("NewApi")
public void onClick(View v) {
;
Intent intent=new Intent(getApplicationContext(),CalendarView.class); //app crashes from here
startActivity(intent);
}
});
view_attendance.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(ManagerDashboard.this,ViewAttendance.class);
startActivity(intent);
}
});
create_project.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(ManagerDashboard.this,CreateProject.class);
startActivity(intent);
}
});
view_project.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(ManagerDashboard.this,ViewProject.class);
startActivity(intent);
}
});
}
}