Ir al contenido principal

Android - First Step


Get an element

To get an specific element by id use the method findViewById
findViewById(R.id.name)

After you do a cast to the corresponding type
private EditText mName = (EditText) findViewById(R.id.name);

Link events with code

In the file activity_main.xml inside the object (for example: ImageButton, Button) use the attribute android:onClick="method_name"

After in the your Activity class (for example MainActivity.java) declare your method as you named previously (in this case method_name()), passing as parameter the View.

    public void method_name(View v) {
     //Your code
    }

Send message in the view (Toast)

Inside your method create a Toast object and use first the method makeText() and then show() method.


Toast.makeText(this.getApplicationContext(), R.string.app_name, Toast.LENGTH_LONG).show();

Animation

Inside the activity method (Ex. public void processForm(View view) {}  ), create the Animation object. In this case the method belong to a button.

Animation anim = AnimationUtils.makeOutAnimation(this, true);
view.startAnimation(anim);

----------------------- Intent ---------------------------------

Call another View

To call another View use the following code, where  SettingsActivity is your class' name.
 Intent i = new Intent(this,SettingsActivity.class);
            startActivity(i);

 Send a plain text message

Inside the activity method (Ex. public void processForm(View view) {}  ), create Intent object.

Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_TEXT, "This is my message");
startActivity(i);

Send sms

Inside the activity method (Ex. public void processForm(View view) {}  ), create Intent object.

mPhone = (EditText) findViewById(R.id.phone); // this is a textbox

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.fromParts("sms", mPhone));
intent.putExtra("sms_body", comments);

Send mail and review configured email client

 Inside the activity method (Ex. public void processForm(View view) {}  ), create Intent object.

 Intent intent = new Intent(Intent.SEND_TO);
intent.setData( Uri.fromParts("mailto", "destiny_mail", null));
intent.putExtra(Intent.EXTRA_SUBJECT, "subject");
intent.putExtra(Intent.EXTRA_TEXT, "message");

   Validate email client


if( intent.resolveActivity(getPackageManager()) == null ){}

When the method resolveActivity return null there is not application to execute the Intent

Send an image file

Inside the activity method (Ex. public void processForm(View view) {}  ), create Intent object.
In this case you have to define the type of file and extension share.setType("image/jpeg").
Also you have to declare the URL where is the file with share.putExtra(Intent.EXTRA_STREAM, uri);
Finally you need to execute the activity like the others with startActivity and if you want configure the chooser application with your own message.

Intent share = new Intent(Intent.ACTION_SEND);
        share.setType("image/jpeg");
        share.putExtra(Intent.EXTRA_STREAM, uri);
        startActivity(Intent.createChooser(share, "Share using..."));

Get Resource / startActivityForResult()

This intent open the gallery. The method startActivityForResult return the result of the new created activity.


Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
 intent.setType("image/*");
startActivityForResult(Intent.createChooser(intent,"Select..."), REQUEST_CODE);


After the intent finished the task execute the method onActivityResult, to use it you have to override the method in your code, one of the parameters the method received is resultCode, the parameter received as possible values: RESULT_CANCELED or RESULT_OK


 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
 
    }
}

Scan new images

This intent do a refresh action to view the new images in our cellphone. The difference for this case is that instead of use startActivity to execute the intent, now you have to use
sendBroadcast method.

Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        intent.setData(uri);
        sendBroadcast(intent);


Comentarios

Publicar un comentario

Entradas populares de este blog

Android - Basic Steps (Service)

Service Run in the main thread of the hosting application Android can kill the Service if need the resources Purpose Supporting inter-application method execution Performing background processing Start a Service Call Context.startService(Intent intent)\ To call from a Fragment use getActivity().getApplicationContext().startService( intentService); Executing the service After call startService(...)  In the Service is executed the method onStartCommand(...) If the method returns the constant START_NOT_STICKY then Android will not restart the service automatically if the the process is killedp Foreground To execute the service foreground call the method startForeground() Use this if the user is aware of the process Bind to a Service Call the method Context.bindService( Intent service ServiceConnection con int flags ) Send Toast from the Service On the method onStartCommand receive the message   ...
Publicar un comentario
Leer más

BI - SSIS ( Basics I )

SSIS - Basic Concepts Tasks Bulk Insert Task—Loads data into a table by using the BULK INSERT SQL command. Data Flow Task—This is the most important task that loads and transforms data into an OLE DB Destination. Execute Package Task—Enables you to execute a package from within a package, making your SSIS packages modular. Execute Process Task—Executes a program external to your package, like one to split your extract file into many files before processing the individual files. Execute SQL Task—Executes a SQL statement or stored procedure. File System Task—This task can handle directory operations like creating, renaming, or deleting a directory. It can also manage file operations like moving, copying, or deleting files. FTP Task—Sends or receives files from an FTP site. Script Task—Runs a set of VB.NET or C# coding inside a Visual Studio environment. Send Mail Task—Sends a mail message through SMTP. Analysis Services Processing Task—This task processes a SQL Server A...
Publicar un comentario
Leer más

TOGAF9

Kinds of Architectures Business Architecture / Business Process Architecture    Define the business strategy, governance, organization and key business processes Data Architecture    Describe the structure of an organization logical and physical data assets and data resources Application Architecture    Describe a blueprint for the individual application systems to be deploy, interactions and  their relationships to the core business processes of the organization Technology Architecture    Describe the logical software and hardware capabilities that are required to support the deployment of business data and application services. This includes middle-ware infrastructure, networks, communications, processing standards  Architecture Governance Increase transparency of accountability, and informed delegation of authority Controlled risk management Protection of the existing asset base through maximizing  re-us...
Publicar un comentario
Leer más