Smashing eBook #29 Designing for Android

By Smashing eBook Series

For those who intend to layout for cellular, you have to be aware of the democratic situation that offers form to this area of interest. Many builders are conscious of this: through the use of the Android working procedure to create apps, they collect an immense industry proportion. This publication will consultant you thru the Android universe and assist you to create interface designs for Android cellular gadgets.

TABLE OF CONTENTS

- discovering The Android Platform: development, trying out And allotting Apps
- Designing For Android
- Designing For Android: counsel And Techniques
- Designing For Android Tablets
- Getting the easiest Out Of Eclipse For Android Development
- start constructing For Android With Eclipse
- start constructing For Android With Eclipse, Reloaded

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again in AddTeaActivity, upload the override tools for onCreateOptionsMenu and onOptionsItemSelected, similar to you probably did in BrewClockActivity. even if, this time, you’ll provide the add_tea. xml source dossier to the MenuInflater: // src/com/example/brewclock/AddTeaActivity. java @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater. inflate(R. menu. add_tea, menu); go back precise; } @Override public boolean onOptionsItemSelected(MenuItem merchandise) { switch(item. getItemId()) { case R. identification. save_tea: saveTea(); default: go back great. onOptionsItemSelected(item); } } subsequent, we’ll upload a brand new strategy, saveTea(), to address saving the tea. The saveTea technique first reads the identify and brew time values selected by way of the person, validates them and (if all is easily) saves them to the database: // src/com/example/brewclock/AddTeaActivity. java public boolean saveTea() { // learn values from the interface String teaNameText = teaName. getText(). toString(); int brewTimeValue = brewTimeSeekBar. getProgress() + 1; // Validate a reputation has been entered for the tea if(teaNameText. length() < 2) { AlertDialog. Builder conversation = new AlertDialog. Builder(this); conversation. setTitle(R. string. invalid_tea_title); conversation. setMessage(R. string. invalid_tea_no_name); conversation. show(); go back fake; } // The tea is legitimate, so connect with the tea database and insert the tea TeaData teaData = new TeaData(this); teaData. insert(teaNameText, brewTimeValue); teaData. close(); go back precise; } this can be really a hefty bite of code, so let’s pass over the common sense. First, we learn the values of the EditText teaName and the SeekBar brewTimeSeekBar (remembering so as to add 1 to the worth to make sure a brew time of among 1 and 10 minutes). subsequent, we validate identify has been entered that's or extra characters (this is admittedly uncomplicated validation; you want to test doing whatever extra tricky, reminiscent of utilizing average expressions). If the tea identify isn't really legitimate, we have to allow the person comprehend. We utilize one in every of Android’s helper periods, AlertDialog. Builder, which provides us a convenient shortcut for developing and exhibiting a modal conversation window. After atmosphere the identify and mistake message (using our string resources), the discussion is displayed through calling its show() strategy. This discussion is modal, so the consumer must brush off it by way of urgent the “Back” key. At this aspect, we don’t are looking to retailer any information, so simply go back fake out of the tactic. If the tea is legitimate, we create a brand new transitority connection to our tea database utilizing the TeaData type. This demonstrates the good thing about abstracting your database entry to a separate type: you could entry it from at any place within the program! After calling teaData. insert() so as to add our tea to the database, we not desire this database connection, so we shut it ahead of returning precise to point that the keep was once winning.

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