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13 Android Epoch HTML/Javascript Calendar
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44 | Chapter 1: Getting Started
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>
File: CalendarView.java
Example 1-18.
import java.util.Date;
import
import
import
import
import
import
import
import
import
import
import
import
import
import
android.app.Activity;
android.content.Intent;
android.os.Bundle;
android.os.Handler;
android.util.Log;
android.view.View;
android.view.View.OnClickListener;
android.webkit.JsResult;
android.webkit.WebChromeClient;
android.webkit.WebSettings;
android.webkit.WebView;
android.widget.Button;
android.widget.ImageView;
android.widget.Toast;
import com.pfizer.android.R;
import com.pfizer.android.utils.DateUtils;
import com.pfizer.android.view.screens.journal.CreateEntryScreen;
public class CalendarViewActivity extends Activity
{
private static final String tag = "CalendarViewActivity";
private ImageView calendarToJournalButton;
private Button calendarDateButton;
private WebView webview;
private Date selectedCalDate;
private final Handler jsHandler = new Handler();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
Log.d(tag, "Creating View ...");
super.onCreate(savedInstanceState);
// Set the View Layer
Log.d(tag, "Setting-up the View Layer");
setContentView(R.layout.calendar_view);
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// Go to CreateJournalEntry
calendarToJournalButton = (ImageView) this.findViewById(R.id.calendarToJournalButton);
calendarToJournalButton.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
Log.d(tag, "Re-directing -> CreateEntryScreen ...");
Intent intent = intent = new Intent(getApplicationContext(), CreateEntryScree
startActivity(intent);
}
});
// User-Selected Calendar Date
calendarDateButton = (Button) this.findViewById(R.id.calendarDateButton);
// Get access to the WebView holder
webview = (WebView) this.findViewById(R.id.webview);
// Get the settings
WebSettings settings = webview.getSettings();
// Enable Javascript
settings.setJavaScriptEnabled(true);
// Enable ZoomControls visibility
settings.setSupportZoom(true);
// Add Javascript Interface
webview.addJavascriptInterface(new MyJavaScriptInterface(), "android");
// Set the Chrome Client
webview.setWebChromeClient(new MyWebChromeClient());
// Load the URL of the HTML file
webview.loadUrl("file:///android_asset/calendarview.html");
}
public void setCalendarButton(Date selectedCalDate)
{
Log.d(tag, jsHandler.obtainMessage().toString());
calendarDateButton.setText(DateUtils.convertDateToSectionHeaderFormat(selectedCalDate.getTime
}
/**
*
* @param selectedCalDate
*/
public void setSelectedCalDate(Date selectedCalDate)
{
this.selectedCalDate = selectedCalDate;
}
46 | Chapter 1: Getting Started
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/**
*
* @return
*/
public Date getSelectedCalDate()
{
return selectedCalDate;
}
/**
* JAVA->JAVASCRIPT INTERFACE
*
* @author wagied
*
*/
final class MyJavaScriptInterface
{
private Date jsSelectedDate;
MyJavaScriptInterface()
{
// EMPTY;
}
public void onDayClick()
{
jsHandler.post(new Runnable()
{
public void run()
{
// Java telling Javascript to do things
webview.loadUrl("javascript: popup();");
}
});
}
/**
* NOTE: THIS FUNCTION IS BEING SET IN JAVASCRIPT User-selected Date in
* WebView
*
* @param dateStr
*/
public void setSelectedDate(String dateStr)
{
Toast.makeText(getApplicationContext(), dateStr, Toast.LENGTH_SHORT).show();
Log.d(tag, "User Selected Date: Javascript -> Java : " + dateStr);
// Set the User Selected Calendar date
setJsSelectedDate(new Date(Date.parse(dateStr)));
Log.d(tag, "java.util.Date Object: " + Date.parse(dateStr).toString());
}
private void setJsSelectedDate(Date userSelectedDate)
{
jsSelectedDate = userSelectedDate;
}
public Date getJsSelectedDate()
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{
}
return jsSelectedDate;
}
/**
* Alert pop-up for debugging purposes
*
* @author wdavid01
*
*/
final class MyWebChromeClient extends WebChromeClient
{
@Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result)
{
Log.d(tag, message);
result.confirm();
return true;
}
}
}
@Override
public void onDestroy()
{
Log.d(tag, "Destroying View!");
super.onDestroy();
}
For debugging purposes, a MyWebChromeClient is created and the onJsAlert() method is overriden.
1.14 Sharing Java classes from another Eclipse Project
Ian Darwin
Problem
You want to use a class from another project, but don't want to copy-and-paste
Solution
Add the project as a "referenced project", and Eclipse (and DEX) will do the work.
Discussion
You often need to re-use classes from another project. In JPSTrack GPS tracking program, the Android version borrows classes like the file I/O module from the Java SE
version. You surely do not want to copy and paste classes willy-nilly from one project
into another, because this makes maintenance improbable.
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Figure 1-28.
All you really have to do is declare the project containing the needed classes (the Java
SE version in this case) as a referenced project on the build path. Select Project->Properties->Build Path, select Project, and click "Add". In the screenshot I am adding the
SE project "jpstrack" as a dependency on the Android version project "jpstrack.android".
Since you are probably keeping both projects under source control (if these are programs you ever ship, you should!), remember to tag both projects when you release the
Android project - one of the points in favor of source control is that you need to be able
to re-create exactly what you shipped.
1.15 Referencing libraries to implement external functionality
Rachee Singh
Problem
You need to reference an external library in your source code
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