Android Delete Rows Data in SQLite
package com.myapp;
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class myDBClass extends SQLiteOpenHelper {
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "mydatabase";
// Table Name
private static final String TABLE_MEMBER = "members";
public myDBClass(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
// Create Table Name
db.execSQL("CREATE TABLE " + TABLE_MEMBER +
"(MemberID INTEGER PRIMARY KEY AUTOINCREMENT," +
" Name TEXT(100)," +
" Tel TEXT(100));");
Log.d("CREATE TABLE","Create Table Successfully.");
}
// Delete Data
public long DeleteData(String strMemberID) {
// TODO Auto-generated method stub
try {
SQLiteDatabase db;
db = this.getWritableDatabase(); // Write Data
/**
* for API 11 and above
SQLiteStatement insertCmd;
String strSQL = "DELETE FROM " + TABLE_MEMBER
+ " WHERE MemberID = ? ";
insertCmd = db.compileStatement(strSQL);
insertCmd.bindString(1, strMemberID);
return insertCmd.executeUpdateDelete();
*
*/
long rows = db.delete(TABLE_MEMBER, "MemberID = ?",
new String[] { String.valueOf(strMemberID) });
db.close();
return rows; // return rows deleted.
} catch (Exception e) {
return -1;
}
}
// Show All Data
public ArrayList<HashMap<String, String>> SelectAllData() {
// TODO Auto-generated method stub
try {
ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
HashMap<String, String> map;
SQLiteDatabase db;
db = this.getReadableDatabase(); // Read Data
String strSQL = "SELECT * FROM " + TABLE_MEMBER;
Cursor cursor = db.rawQuery(strSQL, null);
if(cursor != null)
{
if (cursor.moveToFirst()) {
do {
map = new HashMap<String, String>();
map.put("MemberID", cursor.getString(0));
map.put("Name", cursor.getString(1));
map.put("Tel", cursor.getString(2));
MyArrList.add(map);
} while (cursor.moveToNext());
}
}
cursor.close();
db.close();
return MyArrList;
} catch (Exception e) {
return null;
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + TABLE_MEMBER);
// Re Create on method onCreate
onCreate(db);
}
}
<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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="35dp"
android:text="Main Menu"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="35dp"
android:text="Add" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button1"
android:layout_centerInParent="true"
android:layout_marginTop="35dp"
android:text="Show" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button2"
android:layout_centerInParent="true"
android:layout_marginTop="35dp"
android:text="Update" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button3"
android:layout_centerInParent="true"
android:layout_marginTop="35dp"
android:text="Delete" />
</RelativeLayout>
package com.myapp;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.app.Activity;
import android.content.Intent;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Button4 (Delete)
final Button btn4 = (Button) findViewById(R.id.button4);
// Perform action on click
btn4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Open Form ListDelete
Intent newActivity = new Intent(MainActivity.this,ListDeleteActivity.class);
startActivity(newActivity);
}
});
}
}
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tableLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:gravity="center"
android:text="Delete Member : "
android:layout_span="1"
android:textAppearance="?android:attr/textAppearanceLarge" />
</TableRow>
<View
android:layout_height="1dip"
android:background="#CCCCCC" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.1">
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="false"
android:focusableInTouchMode="false"
android:clickable="false">
</ListView>
</LinearLayout>
<View
android:layout_height="1dip"
android:background="#CCCCCC" />
<LinearLayout
android:id="@+id/LinearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dip" >
<Button
android:id="@+id/btnCancel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancel" />
</LinearLayout>
</TableLayout>
<resources>
<string name="app_name">MyApp</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_main">My App V 1.0</string>
<string-array name="CmdMenu">
<item>Edit</item>
<item>Delete</item>
</string-array>
</resources>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/linearLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/ColMemberID" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="MemberID"/> <TextView android:id="@+id/ColName" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="2" android:text="Name"/> <TextView android:id="@+id/ColTel" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="Tel" /> </LinearLayout>
package com.myapp;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
public class ListDeleteActivity extends Activity {
ArrayList<HashMap<String, String>> MebmerList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_delete);
// Call Show List All Data
ShowListData();
// btnCancel (Cancel)
final Button cancel = (Button) findViewById(R.id.btnCancel);
cancel.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Open Form Main
Intent newActivity = new Intent(ListDeleteActivity.this,MainActivity.class);
startActivity(newActivity);
}
});
}
// Show List data
public void ShowListData()
{
myDBClass myDb = new myDBClass(this);
MebmerList = myDb.SelectAllData();
// listView1
ListView lisView1 = (ListView)findViewById(R.id.listView1);
SimpleAdapter sAdap;
sAdap = new SimpleAdapter(ListDeleteActivity.this, MebmerList, R.layout.activity_column,
new String[] {"MemberID", "Name", "Tel"}, new int[] {R.id.ColMemberID, R.id.ColName, R.id.ColTel});
lisView1.setAdapter(sAdap);
registerForContextMenu(lisView1);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
//if (v.getId()==R.id.list) {
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)menuInfo;
menu.setHeaderTitle("Command for : " + MebmerList.get(info.position).get("Name").toString());
String[] menuItems = getResources().getStringArray(R.array.CmdMenu);
for (int i = 0; i<menuItems.length; i++) {
menu.add(Menu.NONE, i, i, menuItems[i]);
}
//}
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)item.getMenuInfo();
int menuItemIndex = item.getItemId();
String[] menuItems = getResources().getStringArray(R.array.CmdMenu);
String CmdName = menuItems[menuItemIndex];
String MemID = MebmerList.get(info.position).get("MemberID").toString();
//String MemName = MebmerList.get(info.position).get("Name").toString();
// Check Event Command
if ("Edit".equals(CmdName)) {
// Show on new activity
//Intent newActivity = new Intent(ListDeleteActivity.this,UpdateActivity.class);
//newActivity.putExtra("MemID", MebmerList.get(info.position).get("ID").toString());
//startActivity(newActivity);
// for Delete Command
} else if ("Delete".equals(CmdName)) {
myDBClass myDb = new myDBClass(this);
long flg = myDb.DeleteData(MemID);
if(flg > 0)
{
Toast.makeText(ListDeleteActivity.this,"Delete Data Successfully",
Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(ListDeleteActivity.this,"Delete Data Failed.",
Toast.LENGTH_LONG).show();
}
// Call Show Data again
ShowListData();
}
return true;
}
}
<activity
android:name="ListDeleteActivity"
android:theme="@style/AppTheme"
android:screenOrientation="portrait"
android:label="@string/title_activity_main" />
if ("Edit".equals(CmdName)) {
// Show on new activity
Intent newActivity = new Intent(ListDeleteActivity.this,UpdateActivity.class);
newActivity.putExtra("MemID", MebmerList.get(info.position).get("ID").toString());
startActivity(newActivity);
}
Kaynak : Google
