Android Gallery with Dots On Scroll

April 21, 2012May 23, 2015 Laura Suciu22 Comments

In this tutorial I will show you how to create an Android Gallery and how to create dots or little circles when you scroll the images. So let’s start:

1. First you have to create a new project.
2. After the project is created go to res -> drawable and put your images in the drawable folder. If you don’t have a drawable folder you must create it by pressing right click – new directory and name it “drawable”.

NOTE: You have to run the project on the device if the images are too large. And you should resize your images!

3. Now you have to create another class called “ImageAdapter”. This class will extend the BaseAdapter class and you will have to implement all the methods that the IDE suggests you. After that you will have to create a constructor for the class and an Array of integers where you will store your images ids.

The code will look like this:

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
//array of integers for images IDs
private Integer[] mImageIds = {
R.drawable.avatar_423,
R.drawable.da,
R.drawable.penguins
};
//constructor
public ImageAdapter (Context c){
mContext = c;
}
@Override
public int getCount() {
return mImageIds.length;
}
@Override
public Object getItem(int i) {
return i;
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(mImageIds[i]);
imageView.setLayoutParams(new Gallery.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
return imageView;
}
}

import android.content.Context;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.Gallery;

import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {

private Context mContext;

//array of integers for images IDs

private Integer[] mImageIds = {

R.drawable.avatar_423,

R.drawable.da,

R.drawable.penguins

};

//constructor

public ImageAdapter (Context c){

mContext = c;

}

@Override

public int getCount() {

return mImageIds.length;

}

@Override

public Object getItem(int i) {

return i;

}

@Override

public long getItemId(int i) {

return i;

}

@Override

public View getView(int i, View view, ViewGroup viewGroup) {

ImageView imageView = new ImageView(mContext);

imageView.setImageResource(mImageIds[i]);

imageView.setLayoutParams(new Gallery.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));

return imageView;

}

4. Now you will have to make some changes in the XML layout. Go to res – layout – main.xml and open the main.xml. Here delete all you have and put the following code :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Hello World, MyActivity"/>
<!-- This is the Gallery -->
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<!-- This LinearLayout if for the dots -->
<LinearLayout android:id="@+id/image_count"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:background="#00000000">
</LinearLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Hello World, MyActivity"/>

<Gallery xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/gallery"

android:layout_width="fill_parent"

android:layout_height="wrap_content"/>

<LinearLayout android:id="@+id/image_count"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:gravity="center"

android:background="#00000000">

</LinearLayout>

5. Now go to your activity class (mine is called MyActivity) and put the following code:

import android.app.Activity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
public class MyActivity extends Activity
{
static TextView mDotsText[];
private int mDotsCount;
private LinearLayout mDotsLayout;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//here we create the gallery and set our adapter created before
Gallery gallery = (Gallery)findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));
mDotsLayout = (LinearLayout)findViewById(R.id.image_count);
//here we count the number of images we have to know how many dots we need
mDotsCount = gallery.getAdapter().getCount();
//here we create the dots
//as you can see the dots are nothing but "."  of large size
mDotsText = new TextView[mDotsCount];
//here we set the dots
for (int i = 0; i < mDotsCount; i++) {
mDotsText[i] = new TextView(this);
mDotsText[i].setText(".");
mDotsText[i].setTextSize(45);
mDotsText[i].setTypeface(null, Typeface.BOLD);
mDotsText[i].setTextColor(android.graphics.Color.GRAY);
mDotsLayout.addView(mDotsText[i]);
}
//when we scroll the images we have to set the dot that corresponds to the image to White and the others
//will be Gray
gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView adapterView, View view, int pos, long l) {
for (int i = 0; i < mDotsCount; i++) {
MyActivity.mDotsText[i]
.setTextColor(Color.GRAY);
}
MyActivity.mDotsText[pos]
.setTextColor(Color.WHITE);
}
@Override
public void onNothingSelected(AdapterView adapterView) {
}
});
}
}

import android.app.Activity;

import android.graphics.Color;

import android.graphics.Typeface;

import android.os.Bundle;

import android.view.View;

import android.widget.*;

public class MyActivity extends Activity

{

static TextView mDotsText[];

private int mDotsCount;

private LinearLayout mDotsLayout;

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//here we create the gallery and set our adapter created before

Gallery gallery = (Gallery)findViewById(R.id.gallery);

gallery.setAdapter(new ImageAdapter(this));

mDotsLayout = (LinearLayout)findViewById(R.id.image_count);

//here we count the number of images we have to know how many dots we need

mDotsCount = gallery.getAdapter().getCount();

//here we create the dots

//as you can see the dots are nothing but "." of large size

mDotsText = new TextView[mDotsCount];

//here we set the dots

for (int i = 0; i < mDotsCount; i++) {

mDotsText[i] = new TextView(this);

mDotsText[i].setText(".");

mDotsText[i].setTextSize(45);

mDotsText[i].setTypeface(null, Typeface.BOLD);

mDotsText[i].setTextColor(android.graphics.Color.GRAY);

mDotsLayout.addView(mDotsText[i]);

}

//when we scroll the images we have to set the dot that corresponds to the image to White and the others

//will be Gray

gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@Override

public void onItemSelected(AdapterView adapterView, View view, int pos, long l) {

for (int i = 0; i < mDotsCount; i++) {

MyActivity.mDotsText[i]

.setTextColor(Color.GRAY);

}

MyActivity.mDotsText[pos]

.setTextColor(Color.WHITE);

}

@Override

public void onNothingSelected(AdapterView adapterView) {

}

});

}

Now let’s see the result of our project 🙂

References:http://tjkannan.blogspot.com/2011/09/gallery-with-paging-dots.html
http://developer.android.com/resources/tutorials/views/hello-gallery.html

Run Android Lint from command line

March 23, 2012May 22, 2014 Catalin Prata4 Comments

Not many of us use android Lint tool to scan the projects for possible performance or best practices tips. Eclipse has the Lint tool included into adt plugin so Eclipse users can take advantages of this. Ok but what about developers that use intellij IDEA or other IDE for android projects? The answer is simple, you just need the android sdk environment to be installed on your computer. The steps to run a scan on your android project and see the report in a html page are:

open command line (cmd in windows)
navigate to “tools” directory located in android installation directory
here you just have to type :

command – lint –html < html_output_path > < your_android_project_path >
eg: lint –html C:report.html C:yourAndroidProject

go to html_path and open the html test report 🙂

Note: that the html_output_path is automatically created by Lint however you can type an already existing html for output and Lint will override the existing html with the new report.

For those that get java.io.FileNotFoundException: C:report.html < Access is denied > it means that the html report file could not be saved on that path.. you could try to change the path to other partition or path other than C: root. Or you could just create a directory in C: using Windows Explorer, call it “reports” and then you could try again the command like this : lint –html C:reportsreport.html C:yourAndroidProject .

One thing I found. In the results.html I got UnusedResources warning, please make sure that those resources are really unused because many of those resources were used in my project…

You could find more about Lint tool here.

UPDATE: The new Intellij IDEA (version 11.1) has integrated Lint tool. If you want to run the Lint analysis in intellij, just click on the Analyze menu and then Inspect code.
Btw, it seems that has shortcuts to ddms and nine patch too!

Android How to put markers/pins on the map

March 23, 2012May 23, 2015 Laura Suciu13 Comments

We’ve already explained how to make an application with a map here. So, now we will try to put markers or pins (or however are they called) on the map, by knowing the Latitude and Longitude, in case you will ever need it and someday you will 🙂 . So lets start:

1. After you create your Android project you have to create another class besides the main one. Let’s call it MyItemizedOverlay. Well after you made this you must extend ItemizedOverlay class and override some methods. The code is just as bellow:

package com.example;
import android.app.AlertDialog;
import android.content.Context;
import android.graphics.drawable.Drawable;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.OverlayItem;
import java.util.ArrayList;
/**
* Description
*
* @author : kazy
*         Date: 3/23/12
*/
public class MyItemizedOverlay extends ItemizedOverlay {
private ArrayList< overlayitem > mOverlays = new ArrayList< overlayitem >();
Context mContext;
public MyItemizedOverlay(Drawable marker) {
super(boundCenterBottom(marker));
}
public MyItemizedOverlay(Drawable marker, Context context) {
super(boundCenterBottom(marker));
mContext = context;
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
@Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
@Override
public int size() {
return mOverlays.size();
}
@Override
protected boolean onTap(int i) {
//when you tap on the marker this will show the informations provided by you when you create in the 
//main class the OverlayItem
OverlayItem item = mOverlays.get(i);
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
}

package com.example;

import android.app.AlertDialog;

import android.content.Context;

import android.graphics.drawable.Drawable;

import com.google.android.maps.ItemizedOverlay;

import com.google.android.maps.OverlayItem;

import java.util.ArrayList;

/**

* Description

* @author : kazy

* Date: 3/23/12

public class MyItemizedOverlay extends ItemizedOverlay {

private ArrayList< overlayitem > mOverlays = new ArrayList< overlayitem >();

Context mContext;

public MyItemizedOverlay(Drawable marker) {

super(boundCenterBottom(marker));

}

public MyItemizedOverlay(Drawable marker, Context context) {

super(boundCenterBottom(marker));

mContext = context;

}

public void addOverlay(OverlayItem overlay) {

mOverlays.add(overlay);

populate();

}

@Override

protected OverlayItem createItem(int i) {

return mOverlays.get(i);

}

@Override

public int size() {

return mOverlays.size();

}

@Override

protected boolean onTap(int i) {

//when you tap on the marker this will show the informations provided by you when you create in the

//main class the OverlayItem

OverlayItem item = mOverlays.get(i);

AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);

dialog.setTitle(item.getTitle());

dialog.setMessage(item.getSnippet());

dialog.show();

return true;

}

2. Now you have to get a marker image (you can find it on google images) and copy it into the drawable folder (you should name your marker image marker.png like we did for simplicity). If you don’t have a drawable folder press right click on the res directory and create a folder/directory called “drawable”.

3. After you got the image you can go to your main activity class(mine is called MyActivity and extends MapActivity, not Activity don’t forget about this) and put the following code:

package com.example;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import com.google.android.maps.*;
import java.util.List;
public class MyActivity extends MapActivity
{
private MapView mapView;
private MapController mapController;
private GeoPoint geoPoint;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapview);
//sets the zoom to see the location closer
mapView.getController().setZoom(12);
//this will let you to zoom in or out using the controllers
mapView.setBuiltInZoomControls(true);
List< overlay > mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
MyItemizedOverlay itemizedoverlay = new MyItemizedOverlay(drawable, this);
GeoPoint point = new GeoPoint(46066940, 23570000);
//this will show you the map at the exact location you want (if you not set this you will see the map somewhere in America)
mapView.getController().setCenter(point);
OverlayItem overlayitem = new OverlayItem(point, "Title for dialog", "Alba Iulia City From Romania");
GeoPoint point2 = new GeoPoint(35410000, 139460000);
OverlayItem overlayitem2 = new OverlayItem(point2, "Title for dialog", "Japan");
itemizedoverlay.addOverlay(overlayitem);
itemizedoverlay.addOverlay(overlayitem2);
mapOverlays.add(itemizedoverlay);
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
}

package com.example;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import com.google.android.maps.*;

import java.util.List;

public class MyActivity extends MapActivity

{

private MapView mapView;

private MapController mapController;

private GeoPoint geoPoint;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mapView = (MapView) findViewById(R.id.mapview);

//sets the zoom to see the location closer

mapView.getController().setZoom(12);

//this will let you to zoom in or out using the controllers

mapView.setBuiltInZoomControls(true);

List< overlay > mapOverlays = mapView.getOverlays();

Drawable drawable = this.getResources().getDrawable(R.drawable.marker);

MyItemizedOverlay itemizedoverlay = new MyItemizedOverlay(drawable, this);

GeoPoint point = new GeoPoint(46066940, 23570000);

//this will show you the map at the exact location you want (if you not set this you will see the map somewhere in America)

mapView.getController().setCenter(point);

OverlayItem overlayitem = new OverlayItem(point, "Title for dialog", "Alba Iulia City From Romania");

GeoPoint point2 = new GeoPoint(35410000, 139460000);

OverlayItem overlayitem2 = new OverlayItem(point2, "Title for dialog", "Japan");

itemizedoverlay.addOverlay(overlayitem);

itemizedoverlay.addOverlay(overlayitem2);

mapOverlays.add(itemizedoverlay);

}

@Override

protected boolean isRouteDisplayed() {

return false;

}

And now lets see the result of this code 🙂

Now as you can see we have 2 locations(point and point2). To first one is shown to us because we set here

mapView.getController().setCenter(point);

1	mapView.getController().setCenter(point);

So to see the other location which is very far away (in Japan) you need to move the map.

NOTE: The code is mostly from the android developer site

Android PreferenceActivity & SharedPreferences tutorial

March 14, 2012August 20, 2015 Laura Suciu5 Comments

I will start with an example. Let’s assume that we want the user to change the date format of your application. For this you must have a class that extends PreferenceActivity, but first you have to create an XML file like this:
1. Make a directory in res called “xml”
2. In the xml directory create a xml FILE called “preferences.xml “put your code for creating the preferences. In our example it looks like this:

<preferencescreen xmlns:android="http://schemas.android.com/apk/res/android">
<listpreference android:entries="@array/date_format_array" android:entryValues="@array/date_format_values" android:key="date" android:persistent="true" android:title="Change Date format">
</listpreference>  
</preferencescreen>

</listpreference>

</preferencescreen>

3. In res -> values directory create a xml called “array.xml”. Here you will put the items which the the user can select. In our example the code looks like this:

<string-array name="date_format_array">
<item>31/12/2011</item>
<item>12/31/2011</item>
<item>2011/12/31</item>
</string-array>
<string-array name="date_format_values">
<item>31/12/2011</item>
<item>12/31/2011</item>
<item>2011/12/31</item>
</string-array>

<string-array name="date_format_array">

</string-array>

<string-array name="date_format_values">

</string-array>

4. Create an activity which extends PreferenceActivity. In this class you will put the layout created at step 2, “preferences.xml” and you will get the name of the item that the user selects to show in the main list just below the title of each preference. The code looks like this:

public class Preferences extends PreferenceActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//add the prefernces.xml layout
addPreferencesFromResource(R.xml.preferences);       
//get the specified preferences using the key declared in preferences.xml
ListPreference dataPref = (ListPreference) findPreference("date");
//get the description from the selected item
dataPref.setSummary(dataPref.getEntry());
//when the user choose other item the description changes too with the selected item
dataPref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object o) {
preference.setSummary(o.toString());
return true;
});
}
}
}

public class Preferences extends PreferenceActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//add the prefernces.xml layout

addPreferencesFromResource(R.xml.preferences);

//get the specified preferences using the key declared in preferences.xml

ListPreference dataPref = (ListPreference) findPreference("date");

//get the description from the selected item

dataPref.setSummary(dataPref.getEntry());

//when the user choose other item the description changes too with the selected item

dataPref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {

@Override

public boolean onPreferenceChange(Preference preference, Object o) {

preference.setSummary(o.toString());

return true;

});

}

5. And now if you want to get the data format selected by user into a String to use it in other activities you can do this by using SharedPreferences. Here is an example:

public class MyActivity extends Activity {   
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//get data from settings activity in this case the language
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
//in the method getString "date" represents the date from the key value from step 2 and "31/12/2011" represents a default value if the key doesn't exist
String s = settings.getString("date","31/12/2011");
//this is just for test
android.util.Log.e("The item selected is: ",s);       
} 
}
}

public class MyActivity extends Activity {

/**

* Called when the activity is first created.

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//get data from settings activity in this case the language

SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);

//in the method getString "date" represents the date from the key value from step 2 and "31/12/2011" represents a default value if the key doesn't exist

String s = settings.getString("date","31/12/2011");

//this is just for test

android.util.Log.e("The item selected is: ",s);

}

Android: PreferenceActivity Custom Title

March 14, 2012May 22, 2014 Laura SuciuLeave a comment

If you want to make a custom title in a class that extends PreferenceActivity you must put

requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

1	requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

BEFORE super.onCreate(savedInstanceState); Otherwise you will get a Force Close

Android PreferenceScreen

March 14, 2012May 22, 2014 Laura SuciuLeave a comment

If you encounter this problem: “CheckBoxPreference is not allowed here” or other preference tag and your xml file is all red is because you create the xml in res/layout and you must create it in res/xml.
So you have to make a new directory in res called “xml” and this is where your preferences xml will be created. Here is a tutorial.

Android: Scrolling to the bottom of a ScrollView

December 20, 2011May 22, 2014 Catalin Prata4 Comments

Iv’e had a lot of trouble scrolling a ScrollView all the way to the bottom in android and I finally got the way to do it ! Here is the code:

scrollView.post(new Runnable() { 
public void run() {
scrollView.fullScroll(View.FOCUS_DOWN);
}
});

scrollView.post(new Runnable() {

public void run() {

scrollView.fullScroll(View.FOCUS_DOWN);

}

});

Hope it helps somebody !

Android How To Make Google Maps Application

December 9, 2011June 25, 2014 Catalin Prata1 Comment

NOTE: DEPRECATED. You should use Google Maps Android API V2

Sometimes in our applications we have to add new features like Maps. So in today’s tutorial I will show you how to create a map for your application and what you need in order to create it.

Firts of all you have to run the application with Google APIs add-on! To do this, go to emulator settings and change the platform to GoogleApis.(example: if you have Android 2.1 Platform you must change it to Google APIs). But if you don’t have it you must download this add-on as is described here:
http://code.google.com/android/add-ons/google-apis/installing.html

Step 1: If you test your application with the emulator you must find debug.keystore. To find it, press the Windows start button and make a search for debug.keystore and press right click on it and select Open File Location. If you can’t find it in this way you should know that in general the debug.keystore is localized in C:\Users\name_of_your_PC\.android. After you find it, make a folder in “C:\”, called “Android”, so you have something like this: “C:\Android”. In this folder copy the debug.keystore

Step 2: Now open cmd and change the default path to where your Java is installed. In my case it is installed in C:\Program Files\Java\jre6\bin. So, to get to this path you have to use the command “cd..” until you have only “C:\”. After this, type “cd Program Files”-press enter button – “cd Java” – press enter button – “cd jre6” – press enter button – “cd bin”- press enter button. Of course if your Java files are installed somewhere else you have to change the directory to where they are. You have to get to Java\bin because here is the keytool.

Step 3: Enter the following in the cmd code and press enter:

keytool.exe -list -alias androiddebugkey -keystore “C:\android\debug.keystore” -storepass android -keypass android

Now you have obtained your certificate fingerprint.

Step 4: Copy the certificate fingerprint obtained and navigate your web browser to http://code.google.com/android/maps-api-signup.html. Here you have to introduce your certificate and google will generate an api key which you will have to use in your android application.

Step 5: Now you have to go to your android project and modify the AndroidManifest.xml file by adding the element together with the Internet permission , like in the picture below:

As you can see here you put the apikey obtained. So the row with the key you will have to change with your key.

Step 6: In your main.xml layout you have to modify the LinearLayout to RelativeLayout and put the code like in the below example:

NOTE: If you are not allowed to put the

<b>com.google.android.maps.MapView</b>

1	<b>com.google.android.maps.MapView</b>

in the RelativeLayout then you should delete the RelativeLayout and let only the maps code like is describe here at step 5.
Step 7: Now you must modify your activity class. To do so, extend your class to MapActivity instead of Activity.

public class Maps extends MapActivity{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
protected boolean isRouteDisplayed() {
return false; 
}
}

public class Maps extends MapActivity{

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

@Override

protected boolean isRouteDisplayed() {

return false;

}

And now that you learned how to show a map from your application you should also see the result:

I hope this tutorial helped you.

Android How To Make an AlertDialog

December 9, 2011May 23, 2015 Catalin PrataLeave a comment

To make an AlertDialog you have to write this code:

AlertDialog.Builder alertDelete = new AlertDialog.Builder(ListsActivity.this); //HERE YOU WILL WRITE THE MESSAGE YOU WANT alertDelete.setMessage(R.string.delete_confirm); //HERE IS THE POSITIVE BUTTON. YOU HAVE TO SET THE BUTTON NAME AND A CLICK LISTENER alertDelete.setPositiveButton(getString(R.string.yes),new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { //YOUR ACTION } }); //HERE IS THE CANCEL BUTTON. YOU HAVE TO SET THE BUTTON NAME AND A CLICK LISTENER alertDelete.setNeutralButton(getString(R.string.cancel),new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int i) { dialog.cancel(); } }); alertDelete.show();

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AlertDialog.Builder alertDelete = new AlertDialog.Builder(ListsActivity.this);
//HERE YOU WILL WRITE THE MESSAGE YOU WANT
alertDelete.setMessage(R.string.delete_confirm);
//HERE IS THE POSITIVE BUTTON. YOU HAVE TO SET THE BUTTON NAME AND A CLICK LISTENER
alertDelete.setPositiveButton(getString(R.string.yes),new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//YOUR ACTION
}
});

//HERE IS THE CANCEL BUTTON. YOU HAVE TO SET THE BUTTON NAME AND A CLICK LISTENER
alertDelete.setNeutralButton(getString(R.string.cancel),new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int i) {
dialog.cancel();
}
});
alertDelete.show();

And now the result:

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