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android_learning:headfirst_android_development_notes:chapter_12

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android_learning:headfirst_android_development_notes:chapter_12 [2016/04/24 03:37] – mithatandroid_learning:headfirst_android_development_notes:chapter_12 [2016/04/24 04:08] (current) – [p. 513-514: Code block] mithat
Line 1: Line 1:
 ====== Chapter 12 ====== ====== Chapter 12 ======
  
-This is just some text to get the section below to clear the Table of Contents. Otherwise the whole code block would appear very narrow. Kludgey for sure, but it gets the job done.  \\+This is just some text to get the section below to clear the Table of Contents. Otherwise the whole code block would appear very narrow. 
 + 
 +Kludgey for sure, but it gets the job done.  \\
  \\   \\ 
  \\   \\ 
Line 36: Line 38:
         try {         try {
             // Gain access to our app's database:             // Gain access to our app's database:
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);+            SQLiteOpenHelper starbuzzDatabaseHelper = 
 +                new StarbuzzDatabaseHelper(this);
             SQLiteDatabase db = starbuzzDatabaseHelper.getReadableDatabase();             SQLiteDatabase db = starbuzzDatabaseHelper.getReadableDatabase();
  
Line 71: Line 74:
             db.close();             db.close();
         } catch (SQLiteException e) {         } catch (SQLiteException e) {
-            Toast toast = Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT);+            Toast toast = Toast.makeText(this, "Database unavailable",  
 +                Toast.LENGTH_SHORT);
             toast.show();             toast.show();
         }         }
Line 108: Line 112:
     protected void onCreate(Bundle savedInstanceState) {     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);         super.onCreate(savedInstanceState);
-        ListView listDrinks = getListView(); // i.e., this.getListView(); get the ListView used by this ListActivity+        ListView listDrinks = getListView(); // i.e., this.getListView();  
 +                                             // get the ListView used by  
 +                                             // this ListActivity
  
         // Use a cursor via an adapter to populate listDrinks         // Use a cursor via an adapter to populate listDrinks
         try {         try {
             // Gain access to our app's database:             // Gain access to our app's database:
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);+            SQLiteOpenHelper starbuzzDatabaseHelper =  
 +                new StarbuzzDatabaseHelper(this);
             db = starbuzzDatabaseHelper.getReadableDatabase();             db = starbuzzDatabaseHelper.getReadableDatabase();
  
Line 132: Line 139:
             listDrinks.setAdapter(listAdapter);             listDrinks.setAdapter(listAdapter);
         } catch (SQLiteException e) {         } catch (SQLiteException e) {
-            Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT).show();+            Toast.makeText(this, "Database unavailable",  
 +                Toast.LENGTH_SHORT).show();
         }         }
     }     }
Line 147: Line 155:
     protected void onListItemClick(ListView l, View v, int position, long id) {     protected void onListItemClick(ListView l, View v, int position, long id) {
         super.onListItemClick(l, v, position, id);         super.onListItemClick(l, v, position, id);
-        Intent intent = new Intent(DrinkCategoryActivity.this, DrinkActivity.class);+        Intent intent = new Intent(DrinkCategoryActivity.this,  
 +            DrinkActivity.class);
         intent.putExtra(DrinkActivity.EXTRA_DRINKNO, (int) id);         intent.putExtra(DrinkActivity.EXTRA_DRINKNO, (int) id);
         startActivity(intent);         startActivity(intent);
Line 187: Line 196:
         try {         try {
             // Gain access to our app's database:             // Gain access to our app's database:
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);+            SQLiteOpenHelper starbuzzDatabaseHelper =  
 +                new StarbuzzDatabaseHelper(this);
             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();
  
             // Get the name, description, and image for drinkNo:             // Get the name, description, and image for drinkNo:
             Cursor cursor = db.query ("DRINK",             Cursor cursor = db.query ("DRINK",
-                    new String[] {"NAME", "DESCRIPTION", "IMAGE_RESOURCE_ID", "FAVORITE"},+                    new String[] 
 +                        {"NAME", "DESCRIPTION", "IMAGE_RESOURCE_ID", "FAVORITE"},
                     "_id = ?",                     "_id = ?",
                     new String[] {Integer.toString(drinkNo)},                     new String[] {Integer.toString(drinkNo)},
Line 227: Line 238:
             db.close();             db.close();
         } catch (SQLiteException e) {         } catch (SQLiteException e) {
-            Toast toast = Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT);+            Toast toast = Toast.makeText(this, "Database unavailable", 
 +                Toast.LENGTH_SHORT);
             toast.show();             toast.show();
         }         }
Line 241: Line 253:
         drinkValues.put("FAVORITE", favorite.isChecked());         drinkValues.put("FAVORITE", favorite.isChecked());
  
-        SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(DrinkActivity.this);+        SQLiteOpenHelper starbuzzDatabaseHelper =  
 +            new StarbuzzDatabaseHelper(DrinkActivity.this);
  
         try {         try {
             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();
-            db.update("DRINK", drinkValues, "_id = ?", new String[] {Integer.toString(drinkNo)});+            db.update("DRINK", drinkValues, "_id = ?", 
 +                new String[] {Integer.toString(drinkNo)});
             db.close();             db.close();
         } catch(SQLiteException e) {         } catch(SQLiteException e) {
-            Toast.makeText(DrinkActivity.this, "Database unavailable", Toast.LENGTH_SHORT).show();+            Toast.makeText(DrinkActivity.this, "Database unavailable", 
 +                Toast.LENGTH_SHORT).show();
         }         }
     }     }
Line 283: Line 298:
         setContentView(R.layout.activity_top_level);         setContentView(R.layout.activity_top_level);
  
-        AdapterView.OnItemClickListener itemClickListener = new AdapterView.OnItemClickListener() {+        AdapterView.OnItemClickListener itemClickListener = 
 +            new AdapterView.OnItemClickListener() { 
             @Override             @Override
-            public void onItemClick(AdapterView<?> parent, View view, int position, long id) { +            public void onItemClick (AdapterView<?> parent, View view, 
-                if (position == 0) { +                int position, long id) { 
-                    Intent intent = new Intent(TopLevelActivity.this, DrinkCategoryActivity.class); +                    if (position == 0) { 
-                    startActivity(intent); +                        Intent intent = new Intent(TopLevelActivity.this,  
-                }+                            DrinkCategoryActivity.class); 
 +                        startActivity(intent); 
 +                    }
             }             }
         };         };
Line 300: Line 319:
         ListView listFavrotites = (ListView)findViewById(R.id.list_favorites);         ListView listFavrotites = (ListView)findViewById(R.id.list_favorites);
         try {         try {
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);+            SQLiteOpenHelper starbuzzDatabaseHelper =  
 +                new StarbuzzDatabaseHelper(this);
             db = starbuzzDatabaseHelper.getReadableDatabase();             db = starbuzzDatabaseHelper.getReadableDatabase();
  
Line 310: Line 330:
  
             // Map data to list via adapter             // Map data to list via adapter
-            CursorAdapter favoriteAdapter = new SimpleCursorAdapter(TopLevelActivity.this,+            CursorAdapter favoriteAdapter = new SimpleCursorAdapter( 
 +                    TopLevelActivity.this,
                     android.R.layout.simple_list_item_1,                     android.R.layout.simple_list_item_1,
                     favoritesCursor,                     favoritesCursor,
Line 319: Line 340:
  
             // Handle click events on list items - show favorite item's activity             // Handle click events on list items - show favorite item's activity
-            listFavrotites.setOnItemClickListener(new AdapterView.OnItemClickListener() {+            listFavrotites.setOnItemClickListener( 
 +                new AdapterView.OnItemClickListener() {
                 @Override                 @Override
-                public void onItemClick(AdapterView<?> parent, View view, int position, long id) { +                public void onItemClick( 
-                    Intent intent = new Intent(TopLevelActivity.this, DrinkActivity.class); +                    AdapterView<?> parent, View view, int position, long id) { 
-                    intent.putExtra(DrinkActivity.EXTRA_DRINKNO, (int)id); +                        Intent intent =  
-                    startActivity(intent);+                            new Intent(TopLevelActivity.this, DrinkActivity.class); 
 +                        intent.putExtra(DrinkActivity.EXTRA_DRINKNO, (int)id); 
 +                        startActivity(intent); 
 +                    }
                 }                 }
-            });+            );
  
  
         } catch(SQLiteException e) {         } catch(SQLiteException e) {
-            Toast.makeText(TopLevelActivity.this, "Database unavailable", Toast.LENGTH_SHORT).show();+            Toast.makeText(TopLevelActivity.this, "Database unavailable", 
 +                Toast.LENGTH_SHORT).show();
         }         }
     }     }
Line 349: Line 375:
         super.onRestart();         super.onRestart();
         try{         try{
-            StarbuzzDatabaseHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);+            StarbuzzDatabaseHelper starbuzzDatabaseHelper = 
 +                new StarbuzzDatabaseHelper(this);
             db = starbuzzDatabaseHelper.getReadableDatabase();             db = starbuzzDatabaseHelper.getReadableDatabase();
  
Line 365: Line 392:
             favoritesCursor = newCursor;             favoritesCursor = newCursor;
         } catch(SQLiteException e) {         } catch(SQLiteException e) {
-            Toast toast = Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT);+            Toast toast = Toast.makeText(this, "Database unavailable", 
 +                Toast.LENGTH_SHORT);
             toast.show();             toast.show();
         }         }
Line 420: Line 448:
         try {         try {
             // Gain access to our app's database:             // Gain access to our app's database:
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);+            SQLiteOpenHelper starbuzzDatabaseHelper = 
 +                new StarbuzzDatabaseHelper(this);
             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();
  
             // Get the name, description, and image for drinkNo:             // Get the name, description, and image for drinkNo:
             Cursor cursor = db.query ("DRINK",             Cursor cursor = db.query ("DRINK",
-                    new String[] {"NAME", "DESCRIPTION", "IMAGE_RESOURCE_ID", "FAVORITE"},+                    new String[] 
 +                        {"NAME", "DESCRIPTION", "IMAGE_RESOURCE_ID", "FAVORITE"},
                     "_id = ?",                     "_id = ?",
                     new String[] {Integer.toString(drinkNo)},                     new String[] {Integer.toString(drinkNo)},
Line 460: Line 490:
             db.close();             db.close();
         } catch (SQLiteException e) {         } catch (SQLiteException e) {
-            Toast toast = Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT);+            Toast toast = Toast.makeText(this, "Database unavailable", 
 +                Toast.LENGTH_SHORT);
             toast.show();             toast.show();
         }         }
Line 481: Line 512:
             drinkValues = new ContentValues();             drinkValues = new ContentValues();
             drinkValues.put("FAVORITE", favorite.isChecked());             drinkValues.put("FAVORITE", favorite.isChecked());
-            Toast.makeText(DrinkActivity.this, "Backgrounding DB operation...", Toast.LENGTH_SHORT).show();+            Toast.makeText(DrinkActivity.this, "Backgrounding DB operation...",  
 +                Toast.LENGTH_SHORT).show();
         }         }
  
Line 487: Line 519:
         protected Boolean doInBackground(Integer... drinks) {         protected Boolean doInBackground(Integer... drinks) {
             int drinkNo = drinks[0];             int drinkNo = drinks[0];
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(DrinkActivity.this);+            SQLiteOpenHelper starbuzzDatabaseHelper =  
 +                new StarbuzzDatabaseHelper(DrinkActivity.this);
             try {             try {
                 SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();                 SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();
-                db.update("DRINK", drinkValues, "_id = ?", new String[]{Integer.toString(drinkNo)});+                db.update("DRINK", drinkValues, "_id = ?", 
 +                    new String[]{Integer.toString(drinkNo)});
                 db.close();                 db.close();
                 return true;                 return true;
Line 501: Line 535:
         protected void onPostExecute(Boolean success) {         protected void onPostExecute(Boolean success) {
             if (!success) {             if (!success) {
-                Toast.makeText(DrinkActivity.this, "Database unavailable", Toast.LENGTH_SHORT).show();+                Toast.makeText(DrinkActivity.this, "Database unavailable",  
 +                    Toast.LENGTH_SHORT).show();
             } else {             } else {
-                Toast.makeText(DrinkActivity.this, "DB update complete", Toast.LENGTH_SHORT).show();+                Toast.makeText(DrinkActivity.this, "DB update complete", 
 +                    Toast.LENGTH_SHORT).show();
             }             }
         }         }
Line 511: Line 547:
 </file> </file>
  
-===== Logcat =====+===== Debug with the system log =====
 This isn't covered until Chapter 13 in the book, but it's worth using here. This isn't covered until Chapter 13 in the book, but it's worth using here.
  
Line 548: Line 584:
         try {         try {
             // Gain access to our app's database:             // Gain access to our app's database:
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(this);+            SQLiteOpenHelper starbuzzDatabaseHelper =  
 +                new StarbuzzDatabaseHelper(this);
             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();             SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();
  
             // Get the name, description, and image for drinkNo:             // Get the name, description, and image for drinkNo:
             Cursor cursor = db.query ("DRINK",             Cursor cursor = db.query ("DRINK",
-                    new String[] {"NAME", "DESCRIPTION", "IMAGE_RESOURCE_ID", "FAVORITE"},+                    new String[] 
 +                        {"NAME", "DESCRIPTION", "IMAGE_RESOURCE_ID", "FAVORITE"},
                     "_id = ?",                     "_id = ?",
                     new String[] {Integer.toString(drinkNo)},                     new String[] {Integer.toString(drinkNo)},
Line 588: Line 626:
             db.close();             db.close();
         } catch (SQLiteException e) {         } catch (SQLiteException e) {
-            Toast toast = Toast.makeText(this, "Database unavailable", Toast.LENGTH_SHORT);+            Toast toast = Toast.makeText(this, "Database unavailable", 
 +                Toast.LENGTH_SHORT);
             toast.show();             toast.show();
         }         }
Line 615: Line 654:
         protected Boolean doInBackground(Integer... drinks) {         protected Boolean doInBackground(Integer... drinks) {
             int drinkNo = drinks[0];             int drinkNo = drinks[0];
-            SQLiteOpenHelper starbuzzDatabaseHelper = new StarbuzzDatabaseHelper(DrinkActivity.this);+            SQLiteOpenHelper starbuzzDatabaseHelper = 
 +                new StarbuzzDatabaseHelper(DrinkActivity.this);
             try {             try {
                 SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();                 SQLiteDatabase db = starbuzzDatabaseHelper.getWritableDatabase();
-                db.update("DRINK", drinkValues, "_id = ?", new String[]{Integer.toString(drinkNo)});+                db.update("DRINK", drinkValues, "_id = ?", 
 +                    new String[]{Integer.toString(drinkNo)});
                 db.close();                 db.close();
                 return true;                 return true;
Line 629: Line 670:
         protected void onPostExecute(Boolean success) {         protected void onPostExecute(Boolean success) {
             if (!success) {             if (!success) {
-                Toast.makeText(DrinkActivity.this, "Database unavailable", Toast.LENGTH_SHORT).show();+                Toast.makeText(DrinkActivity.this, "Database unavailable", 
 +                    Toast.LENGTH_SHORT).show();
             } else {             } else {
                 Log.d("DB", "DB update complete");                 Log.d("DB", "DB update complete");
android_learning/headfirst_android_development_notes/chapter_12.1461469023.txt.gz · Last modified: 2016/04/24 03:37 by mithat
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