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3. Develop an application that shows names as a list and on selecting a name
it should show the details of the candidate on the next screenwith a “Back”
button. If the screen is rotated to landscape mode (width greater than
height), then the screenshould show liston leftfragment and details onright
fragment instead of second screen with back button. Use Fragment
transactions and Rotation event listener.
public class AndroidListViewActivity extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCre0ate(savedInstanceState);
// storing string resources into Array
String[] numbers = {"one","two","three","four"}
// here you store the array of string you got from the database
// Binding Array to ListAdapter
this.setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, R.id.label, numbers));
// refer the ArrayAdapter Document in developer.android.com
ListView lv = getListView();
// listening to single list item on click
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// selected item
String num = ((TextView) view).getText().toString();](https://image.slidesharecdn.com/androidappdevmanual-1-220411030518/85/Android-App-Dev-Manual-1-doc-8-320.jpg)
Android App Dev Manual-1.doc
- 1. 1 1. (a) Create an Android application that shows Hello + name of the user and run it on an emulator. Create Android Application:
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- 5. 5 1.b) Create an application that takes the name from a text box and shows hello message along with the name entered in text box, when the user clicks the OK button. import android.app.*; import android.os.*; import android.view.*; import android.widget.*; public class MainActivity extends Activity { private Button b; EditText etname,etemail,etpassword; TextView tv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); b=(Button)findViewById(R.id.click); tv=(TextView)findViewById(R.id.display); tv.setMovementMethod(new ScrollingMovementMethod()) b.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { etname=(EditText)findViewById(R.id.name); etemail=(EditText)findViewById(R.id.email); etpassword=(EditText)findViewById(R.id.password); tv.setText("Your Input: n"+etname.getText().toString()+"n"+etemail.getText().toString()+"n"+etpassword.getText().to String()+"nEnd."); } }); }
- 6. 6 2. Create a screen that has input boxes for User Name, Password, Address, Gender (radio buttons for male and female), Age (numeric), Date of Birth (Date Picket), State (Spinner) and a Submit button. On clicking the submit button, print all the data below the Submit Button. Use Declare UI Elements in XML <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/fstTxt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Enter Name" /> <EditText android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="10"/> <Button android:id="@+id/getName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Get Name" /> </LinearLayout> Load XML Layout File from an Activity protectedvoid onCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); }
- 7. 7 Create UI Element at Runtime public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView textView1 = new TextView(this); textView1.setText("Name:"); EditText editText1 = new EditText(this); editText1.setText("Enter Name"); Button button1 = new Button(this); button1.setText("Add Name"); LinearLayout linearLayout = new LinearLayout(this); linearLayout.addView(textView1); linearLayout.addView(editText1); linearLayout.addView(button1); setContentView(linearLayout); }
- 8. 8 3. Develop an application that shows names as a list and on selecting a name it should show the details of the candidate on the next screenwith a “Back” button. If the screen is rotated to landscape mode (width greater than height), then the screenshould show liston leftfragment and details onright fragment instead of second screen with back button. Use Fragment transactions and Rotation event listener. public class AndroidListViewActivity extends ListActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCre0ate(savedInstanceState); // storing string resources into Array String[] numbers = {"one","two","three","four"} // here you store the array of string you got from the database // Binding Array to ListAdapter this.setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, R.id.label, numbers)); // refer the ArrayAdapter Document in developer.android.com ListView lv = getListView(); // listening to single list item on click lv.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // selected item String num = ((TextView) view).getText().toString();
- 9. 9 // Launching new Activity on selecting single List Item Intent i = new Intent(getApplicationContext(), SingleListItem.class); // sending data to new activity i.putExtra("number", num); startActivity(i); } }); } } The secondActivity to display the Particular item you have clicked should be public class SingleListItem extends Activity{ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.single_list_item_view); TextView txtProduct = (TextView) findViewById(R.id.product_label); Intent i = getIntent(); // getting attached intent data String product = i.getStringExtra("number"); // displaying selected product name txtProduct.setText(product); } }
- 10. 10 4. Develop an application that uses a menu with 3 options for dialing a number, opening a website and to sendan SMS.On selecting an option, the appropriate action should be invoked using intents. <?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/new_game" android:icon="@drawable/ic_new_game" android:title="@string/new_game" android:showAsAction="ifRoom"/> <item android:id="@+id/help" android:icon="@drawable/ic_help" android:title="@string/help" /> </menu> <?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/file" android:title="@string/file" > <!-- "file" submenu --> <menu> <item android:id="@+id/create_new" android:title="@string/create_new" /> <item android:id="@+id/open" android:title="@string/open" /> </menu> </item> </menu>
- 11. 11 @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.game_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle item selection switch (item.getItemId()) { case R.id.new_game: newGame(); return true; case R.id.help: showHelp(); return true; default: return super.onOptionsItemSelected(item); } }
- 12. 12 5. Developan application that inserts some notifications into Notification area and whenever a notification is inserted, it should show a toast with details of the notification. Activity_main.xml <?xml version="1.0" encoding="utf-8"?> <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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.journaldev.notifications.MainActivity"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="CREATE NOTIFICATION" android:id="@+id/button"
- 13. 13 android:layout_alignParentTop="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="CANCEL NOTIFICATION" android:id="@+id/button2" android:layout_below="@+id/button" android:layout_alignRight="@+id/button" android:layout_alignEnd="@+id/button" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> </RelativeLayout> MainAcivity.Java package com.journaldev.notifications; import android.app.NotificationManager; import android.app.PendingIntent;
- 14. 14 import android.content.Context; import android.content.Intent; import android.graphics.BitmapFactory; import android.net.Uri; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.app.NotificationCompat; import android.widget.Toast; import butterknife.ButterKnife; import butterknife.OnClick; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ButterKnife.inject(this); } @OnClick(R.id.button) public void sendNotification() { NotificationCompat.Builder builder = new NotificationCompat.Builder(this); builder.setSmallIcon(android.R.drawable.ic_dialog_alert);
- 15. 15 Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://www.journaldev.com/")); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0); builder.setContentIntent(pendingIntent); builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher)); builder.setContentTitle("Notifications Title"); builder.setContentText("Your notification content here."); builder.setSubText("Tap to view the website."); NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); // Will display the notification in the notification bar notificationManager.notify(1, builder.build()); } @OnClick(R.id.button2) public void cancelNotification() { String ns = Context.NOTIFICATION_SERVICE; NotificationManager nMgr = (NotificationManager) getApplicationContext().getSystemService(ns); nMgr.cancel(1); } }
- 16. 16 6.Create an application that uses a text file to store user names and passwords (tab separated fields and one record per line) importjava.io.File; importjava.io.FileOutputStream; importjava.io.FileReader; importjava.io.FileWriter; publicclassMainActivityextendsAppCompatActivity{ EditTextCodNum; EditTextPltNum; RadioButtonradButA; RadioButtonradButD; RadioButtonradButS; RadioButtonradButR; RadioButtonradButO; RadioButtonradButI; @Override protectedvoidonCreate(BundlesavedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbartoolbar= (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar);
- 17. 17 CodNum= (EditText) findViewById(R.id.CodNum); PltNum= (EditText) findViewById(R.id.PltNum); radButA = (RadioButton) findViewById(R.id.radButA); radButD = (RadioButton) findViewById(R.id.radButD); radButS = (RadioButton) findViewById(R.id.radButS); radButR = (RadioButton) findViewById(R.id.radButR); radButO = (RadioButton) findViewById(R.id.radButO); radButI = (RadioButton) findViewById(R.id.radButI); checkBoxMw= (CheckBox) findViewById(R.id.checkBoxMw); checkBoxG7= (CheckBox) findViewById(R.id.checkBoxG7); checkBoxGw= (CheckBox) findViewById(R.id.checkBoxGw); checkBoxF= (CheckBox) findViewById(R.id.checkBoxF); final FileOutputStreamoutputStream; StringfileName ="feederTxtFile"; Button buttonS= (Button) findViewById(R.id.buttonS); buttonS.setOnClickListener(newView.OnClickListener() { @Override publicvoidonClick(Viewv) { try{ outputStream= openFileOutput(fileName,CONTEXT.MOOD_PRIVATE); outputStream.write(String.getBytes()); outputStream.close();
- 18. 18 }catch (Exceptione){ e.printStackTrace(); } } }); Button buttonE= (Button) findViewById(R.id.buttonE); buttonE.setOnClickListener(new View.OnClickListener(){ @Override publicvoidonClick(Viewv) { //Editingtotextfile. } });
- 19. 19 7.Create a user registration application that stores the user details in a database table. activity_login.xml. <?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/nestedScrollView" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/colorBackground" android:paddingBottom="20dp" android:paddingLeft="20dp" android:paddingRight="20dp" android:paddingTop="20dp" tools:context=".activities.LoginActivity"> <android.support.v7.widget.LinearLayoutCompat android:layout_width="match_parent" android:layout_height="match_parent"
- 23. 23 8.Create a database and a user table where the details of login names and passwords are stored. Insert some names and passwords initially. Now the login details entered by the user should be verified with the database and an appropriate dialog should be shown to the user. package com.example.sairamkrishna.myapplication; importandroid.content.Context; importandroid.content.Intent; importandroid.support.v7.app.ActionBarActivity; importandroid.os.Bundle; importandroid.view.KeyEvent; importandroid.view.Menu; importandroid.view.MenuItem; importandroid.view.View; importandroid.widget.AdapterView; importandroid.widget.ArrayAdapter; importandroid.widget.AdapterView.OnItemClickListener; importandroid.widget.ListView; importjava.util.ArrayList; importjava.util.List;
- 24. 24 publicclassMainActivityextendsActionBarActivity{ publicfinal staticStringEXTRA_MESSAGE= "MESSAGE"; private ListViewobj; DBHelpermydb; @Override protectedvoidonCreate(BundlesavedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mydb= newDBHelper(this); ArrayListarray_list= mydb.getAllCotacts(); ArrayAdapterarrayAdapter=newArrayAdapter(this,android.R.layout.simple_list_item_1,array_list); obj = (ListView)findViewById(R.id.listView1); obj.setAdapter(arrayAdapter); obj.setOnItemClickListener(newOnItemClickListener(){ @Override publicvoidonItemClick(AdapterView<?>arg0,View arg1,int arg2,longarg3) { //TODO Auto-generatedmethodstub intid_To_Search= arg2 + 1; Bundle dataBundle =newBundle(); dataBundle.putInt("id",id_To_Search);
- 25. 25 Intentintent=newIntent(getApplicationContext(),DisplayContact.class); intent.putExtras(dataBundle); startActivity(intent); } }); } @Override publicbooleanonCreateOptionsMenu(Menumenu) { // Inflate the menu;thisaddsitemstothe actionbar if it ispresent. getMenuInflater().inflate(R.menu.menu_main,menu); returntrue; } @Override publicbooleanonOptionsItemSelected(MenuItemitem){ super.onOptionsItemSelected(item); switch(item.getItemId()) { case R.id.item1:Bundle dataBundle=new Bundle(); dataBundle.putInt("id",0); Intentintent=new Intent(getApplicationContext(),DisplayContact.class); intent.putExtras(dataBundle);
- 26. 26 startActivity(intent); returntrue; default: returnsuper.onOptionsItemSelected(item); } } publicbooleanonKeyDown(intkeycode,KeyEventevent) { if (keycode ==KeyEvent.KEYCODE_BACK) { moveTaskToBack(true); } returnsuper.onKeyDown(keycode,event); } }