In cases like when I simply want to make a System.out.println or similar with some details of a exception then the following static helper function is very nice as it takes the exception (uses printStackTrace) and returns a string with the contents of it.
public static String getStackTrace(Exception e){ StringWriter stringWriter = new StringWriter(); PrintWriter printWrtier = new PrintWriter(stringWriter); e.printStackTrace(printWrtier); return stringWriter.toString(); }
This will create a custom dialog.
AlertDialog.Builder builder; AlertDialog alertDialog; Context mContext = this; LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE); View layout = inflater.inflate(R.layout.help_dialog, (ViewGroup) findViewById(R.id.layout_root)); TextView text = (TextView) layout.findViewById(R.id.text); text.setText(getString(R.string.help_string)); builder = new AlertDialog.Builder(mContext); builder.setView(layout); alertDialog = builder.create(); alertDialog.show();
And create a “help_dialog.xml” this name is from the inflater
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layout_root" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10dp" > <TextView android:id="@+id/text" android:layout_width="fill_parent" android:layout_height="fill_parent" android:textColor="#FFF" /> </LinearLayout>
Sometimes there is a need to access recourses from static methods.
In order to do this we need to pass along the Context to the method and use getString from that Context.
Example:
package com.f15ijp.android.test; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.view.WindowManager; public class Help { public static AlertDialog helpDialog(Context theContext, String helpMessage){ AlertDialog alertDialog = new AlertDialog.Builder(theContext).create(); alertDialog.setTitle("Help"); alertDialog.setMessage(helpMessage); alertDialog.setButton(theContext.getString(R.string.close_help_btn), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { return; } }); WindowManager.LayoutParams lp = new WindowManager.LayoutParams(); lp.copyFrom(alertDialog.getWindow().getAttributes()); lp.width = WindowManager.LayoutParams.FILL_PARENT; lp.height = WindowManager.LayoutParams.FILL_PARENT; /*by calling alertDialog.show() now and then again after setAttributes the background * the background activity is replaced by a black box. * If this first alertDialog.show() is removed then the (current) acitivity is used as a background. */ alertDialog.show(); alertDialog.getWindow().setAttributes(lp); return alertDialog; } }
In java it is not hard to iterate over a Map. The following example is quick and simple (and if your Map is not of this sort you can change it accordingly easily).
for (Map.Entry<String, Object> entry : map.entrySet()) { String key = entry.getKey(); Object value = entry.getValue(); // ... do important stuff here! }
Creating an empty box in scala lift is not hard, simply fill it with None.
var emptyBox:Box[MyThing] = Box(None);
If you need to use the session id of the current session then it can be fetched from S.
S.containerSession.map(_.sessionId).openOr(""))
Doing a toString on a array don’t really tell that much about the array. Here is one way to get the contents of the array as a string.
int[] myArray = new int[2]; myArray[0] = 1; myArray[1] = 2; System.out.println("array contains " + java.util.Arrays.toString(myArray)); //will output array contains [1, 2]
The Integer Class have a static method toString that takes a int as input and gives us back a string.
int myInt = 1; System.out.println(Integer.toString(myInt);
This is a log more efficient and nice in the long run than just concating the int with a empty string ( myInt + “” ) as that actually creates a bit of overhead. Not much, but still.
To convert from a Boolean to a string
new Boolean(new String("hej".equalsIgnoreCase("HEJ")).toString();
and then from a string to a boolean
boolean theValue = Boolean.parseBoolean(strBoolean);