Repository navigation
Expand file tree
/
Copy pathAndroidApp49-54codes.java
More file actions
213 lines (169 loc) · 6.52 KB
/
Copy pathAndroidApp49-54codes.java
File metadata and controls
213 lines (169 loc) · 6.52 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
package com.thenewboston.sqlitedatabaseexample;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
EditText buckysInput;
TextView buckysText;
MyDBHandler dbHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buckysInput = (EditText) findViewById(R.id.buckysInput);
buckysText = (TextView) findViewById(R.id.buckysText);
dbHandler = new MyDBHandler(this, null, null, 1);
printDatabase();
}
//Add a product to the database
public void addButtonClicked(View view){
Product product = new Product(buckysInput.getText().toString());
dbHandler.addProduct(product);
printDatabase();
}
//Delete items
public void deleteButtonClicked(View view){
String inputText = buckysInput.getText().toString();
dbHandler.deleteProduct(inputText);
printDatabase();
}
//Print the database
public void printDatabase(){
String dbString = dbHandler.databaseToString();
buckysText.setText(dbString);
buckysInput.setText("");
}
}
////////////////////////////////////////////
package com.thenewboston.sqlitedatabaseexample;
//Each row in the database can be represented by an object
//Columns will represent the objects properties
public class Product {
private int _id;
private String _productname;
public Product(){
}
public Product(String productname){
this._productname = productname;
}
public void set_id(int _id) {
this._id = _id;
}
public void set_productname(String _productname) {
this._productname = _productname;
}
public int get_id() {
return _id;
}
public String get_productname() {
return _productname;
}
}
///////////////////////////////
package com.thenewboston.sqlitedatabaseexample;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.Cursor;
import android.content.Context;
import android.content.ContentValues;
public class MyDBHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "productDB.db";
public static final String TABLE_PRODUCTS = "products";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_PRODUCTNAME = "productname";
//We need to pass database information along to superclass
public MyDBHandler(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context, DATABASE_NAME, factory, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String query = "CREATE TABLE " + TABLE_PRODUCTS + "(" +
COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_PRODUCTNAME + " TEXT " +
");";
db.execSQL(query);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_PRODUCTS);
onCreate(db);
}
//Add a new row to the database
public void addProduct(Product product){
ContentValues values = new ContentValues();
values.put(COLUMN_PRODUCTNAME, product.get_productname());
SQLiteDatabase db = getWritableDatabase();
db.insert(TABLE_PRODUCTS, null, values);
db.close();
}
//Delete a product from the database
public void deleteProduct(String productName){
SQLiteDatabase db = getWritableDatabase();
db.execSQL("DELETE FROM " + TABLE_PRODUCTS + " WHERE " + COLUMN_PRODUCTNAME + "=\"" + productName + "\";");
}
public String databaseToString(){
String dbString = "";
SQLiteDatabase db = getWritableDatabase();
String query = "SELECT * FROM " + TABLE_PRODUCTS + " WHERE 1";
//Cursor points to a location in your results
Cursor c = db.rawQuery(query, null);
//Move to the first row in your results
c.moveToFirst();
//Position after the last row means the end of the results
while (!c.isAfterLast()) {
if (c.getString(c.getColumnIndex("productname")) != null) {
dbString += c.getString(c.getColumnIndex("productname"));
dbString += "\n";
}
c.moveToNext();
}
db.close();
return dbString;
}
}
//////////////////
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<EditText
android:id="@+id/buckysInput"
android:width="300dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="35dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<Button
android:text="Add"
android:id="@+id/addButton"
android:onClick="addButtonClicked"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="38dp"
android:layout_below="@+id/buckysInput"
android:layout_alignLeft="@+id/buckysInput"
android:layout_alignStart="@+id/buckysInput" />
<Button
android:text="Delete"
android:id="@+id/deleteButton"
android:onClick="deleteButtonClicked"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/addButton"
android:layout_alignRight="@+id/buckysInput"
android:layout_alignEnd="@+id/buckysInput" />
<TextView
android:id="@+id/buckysText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>