redimensionar - resolucion de imagenes en android studio

Cómo escalar una imagen en Android

Question

Estoy creando una aplicación de Android y puedo agregar una imagen. Sin embargo, lo que quiero hacer es reducir la imagen para ajustarla al tamaño del ImageButton. ¿Hay alguna forma de hacer eso?

El código que he escrito hasta ahora:

package awad865.project.ContactManager1;



import java.io.FileNotFoundException;
import java.io.InputStream;

import android.app.Activity;
import android.content.Intent;
import android.database.SQLException;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Spinner;


public class AddContact extends Activity {
    //declare private fields
    private EditText firstName;
    private EditText lastName;
    private EditText number;
    private EditText address;
    private EditText date;
    private EditText email;
    private Spinner numberSpinner;
    private Spinner emailSpinner;
    private Spinner addressSpinner;
    private Spinner dateSpinner;
    private DatabaseHandler databaseHandler;
    private ImageButton addPic;
    private final int IMAGE_SELECTION =1;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_contact);
        //code that enables the title on the action bar
        getActionBar().setDisplayShowTitleEnabled(true);
        getActionBar().setDisplayHomeAsUpEnabled(true);
        databaseHandler = new DatabaseHandler(this);

        //intialise private fields
        firstName = (EditText)findViewById(R.id.edit_first_name);
        lastName = (EditText)findViewById(R.id.edit_last_name);
        number = (EditText)findViewById(R.id.edit_number);
        address = (EditText)findViewById(R.id.edit_address);
        date = (EditText)findViewById(R.id.edit_date);
        email =(EditText)findViewById(R.id.edit_email);


        //Spinner for the phone number field
        numberSpinner = (Spinner) findViewById(R.id.contact_number_spinner);
        // Create an ArrayAdapter using the string array and a default spinner layout
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.number_array, android.R.layout.simple_spinner_item);
        // Specify the layout to use when the list of choices appears
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        numberSpinner.setAdapter(adapter);


        //Spinner for the email address field
        emailSpinner = (Spinner) findViewById(R.id.contact_email_spinner);
        adapter = ArrayAdapter.createFromResource(this, 
                R.array.email_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        emailSpinner.setAdapter(adapter);

        //Spinner for address field
        addressSpinner = (Spinner) findViewById(R.id.contact_address_spinner);
        adapter= ArrayAdapter.createFromResource(this,
                R.array.address_array, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        addressSpinner.setAdapter(adapter);

        //Spinner for date
        dateSpinner = (Spinner) findViewById(R.id.contact_date_spinner);
        adapter=ArrayAdapter.createFromResource(this, 
                R.array.date_array, android.R.layout.simple_spinner_dropdown_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        dateSpinner.setAdapter(adapter);


        addPic = (ImageButton) findViewById(R.id.addImage);
        Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.ic_social_person);
        addPic.setImageBitmap(bm);

        addPic.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Intent imageIntent = new Intent(Intent.ACTION_PICK);
                imageIntent.setType("image/*");
                startActivityForResult(imageIntent, IMAGE_SELECTION);

            }
        });
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent){
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

        switch(requestCode){
        case IMAGE_SELECTION:
            if(resultCode == RESULT_OK){
                try{
                    BitmapFactory.Options options = new BitmapFactory.Options();
                    options.inScaled = true;
                    final Uri imageURI = imageReturnedIntent.getData();
                    final InputStream inStr = getContentResolver().openInputStream(imageURI);
                    final Bitmap selectImg = BitmapFactory.decodeStream(inStr, null, options);
                    addPic.setImageBitmap(selectImg);
                }catch(FileNotFoundException ex){
                    Log.e("File not found", "Selected image was not found", ex);
                }
            }
            }

    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.add_contact, menu);
        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item){

        switch(item.getItemId()){
        //if the save button is pressed, then all the information is retrieved from the EditText fields
        //and stored in the private fields and then a new contact object is created and added to the 
        //database
        case R.id.action_save:
            BitmapDrawable bmd = ((BitmapDrawable) addPic.getDrawable());
            Bitmap photo = bmd.getBitmap();
            Contact contact = new Contact(firstName.getText().toString(),lastName.getText().toString(),number.getText().toString(), numberSpinner.getSelectedItem().toString(), email.getText().toString(), emailSpinner.getSelectedItem().toString(), date.getText().toString(), dateSpinner.getSelectedItem().toString(), address.getText().toString(), addressSpinner.getSelectedItem().toString(), "false");
            //add to database

            try {
                databaseHandler.openDataBase();
                databaseHandler.addContact(contact);
                databaseHandler.close();
            } catch (SQLException sqle) {
                throw sqle;
            }
            //go back to list of contacts
            Intent intentMain = new Intent(getApplicationContext(),MainActivity.class);
            intentMain.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intentMain);
            return true;

            //if the cancel button is pressed on the action bar then the user is navigate to MainActivity
        case R.id.action_cancel:
            Intent intentCancel = new Intent(this,MainActivity.class);
            intentCancel.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intentCancel);
            return true;
            //if the up button is pressed, then the user is taken back to the MainActivity
        case android.R.id.home:
            NavUtils.navigateUpFromSameTask(this);
            return true;

        default:
            return super.onOptionsItemSelected(item);

        }
    }
}

Archivo XML:

<LinearLayout 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:orientation="vertical"
    tools:context=".AddContact" >

    <TextView
        android:id="@+id/lbl_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="10dp"
        android:text="@string/heading_name"
        android:textColor="#0ab2ea" />

    <View
        android:id="@+id/view_name"
        android:layout_width="wrap_content"
        android:layout_height="1.5dp"
        android:background="@drawable/blue_colour" />

    <LinearLayout
        android:layout_width="337dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="6" >

        <EditText
            android:id="@+id/edit_first_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:layout_weight="5"
            android:hint="@string/hint_firstname"
            android:inputType="textCapSentences" />

        <ImageButton
            android:id="@+id/addImage"
            android:layout_width="0dp"
            android:layout_height="58dp"
            android:layout_weight="1"
            android:background="@drawable/ic_social_person" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="337dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="6" >

        <EditText
            android:id="@+id/edit_last_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_weight="5"
            android:hint="@string/hint_lastname"
            android:inputType="textCapSentences" />
    </LinearLayout>

    <TextView
        android:id="@+id/lbl_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:text="@string/heading_number"
        android:textColor="#0ab2ea" />

    <View
        android:id="@+id/view_number"
        android:layout_width="wrap_content"
        android:layout_height="1.5dp"
        android:background="@drawable/blue_colour" />

    <LinearLayout
        android:layout_width="337dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="3" >

        <EditText
            android:id="@+id/edit_number"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="10dp"
            android:layout_weight="2"
            android:hint="@string/hint_number"
            android:inputType="number" />

        <Spinner
            android:id="@+id/contact_number_spinner"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:layout_weight="1" />
    </LinearLayout>

    <TextView
        android:id="@+id/lbl_email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:text="@string/heading_email"
        android:textColor="#0ab2ea" />

    <View
        android:id="@+id/view_email"
        android:layout_width="wrap_content"
        android:layout_height="1.5dp"
        android:background="@drawable/blue_colour" />

    <LinearLayout
        android:layout_width="337dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="3" >

        <EditText
            android:id="@+id/edit_email"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="10dp"
            android:layout_weight="2"
            android:hint="@string/hint_email"
            android:inputType="textEmailAddress" />

        <Spinner
            android:id="@+id/contact_email_spinner"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:layout_weight="1" />
    </LinearLayout>

    <TextView
        android:id="@+id/lbl_address"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:text="@string/heading_address"
        android:textColor="#0ab2ea" />

    <View
        android:id="@+id/view_address"
        android:layout_width="wrap_content"
        android:layout_height="1.5dp"
        android:background="@drawable/blue_colour" />

    <LinearLayout
        android:layout_width="337dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="3" >

        <EditText
            android:id="@+id/edit_address"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="10dp"
            android:layout_weight="2"
            android:hint="@string/hint_address"
            android:inputType="textPostalAddress" />

        <Spinner
            android:id="@+id/contact_address_spinner"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:layout_weight="1" />
    </LinearLayout>

    <TextView
        android:id="@+id/lbl_event"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:text="@string/heading_event"
        android:textColor="#0ab2ea" />

    <View
        android:id="@+id/view_event"
        android:layout_width="wrap_content"
        android:layout_height="1.5dp"
        android:background="@drawable/blue_colour" />

    <LinearLayout
        android:layout_width="337dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="3" >

        <EditText
            android:id="@+id/edit_date"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="10dp"
            android:layout_weight="2"
            android:hint="@string/hint_date"
            android:inputType="date" />

        <Spinner
            android:id="@+id/contact_date_spinner"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" />
    </LinearLayout>

</LinearLayout>

Cualquier ayuda sería apreciada.

Answer 1

Aquí hay un código que podría ayudarlo:

Reemplace este código

BitmapFactory.Options options = new BitmapFactory.Options();
                    options.inScaled = true;
                    final Uri imageURI = imageReturnedIntent.getData();
                    final InputStream inStr = getContentResolver().openInputStream(imageURI);
                    final Bitmap selectImg = BitmapFactory.decodeStream(inStr, null, options);
                    addPic.setImageBitmap(selectImg);

con el siguiente código

final Uri imageURI = imageReturnedIntent.getData();
                    final InputStream inStr = new BufferedInputStream(getContentResolver().openInputStream(imageURI));

                    int height = addPic.getHeight();
                    int width = addPic.getWidth();

                    BitmapFactory.Options options = new BitmapFactory.Options();
                    options.inJustDecodeBounds = true;
                    BitmapFactory.decodeStream(inStr, null, options);

                    // Calculate inSampleSize
                    options.inSampleSize = calculateInSampleSize(options, width, height);

                    // Decode bitmap with inSampleSize set
                    options.inJustDecodeBounds = false;

                    try {
                        inStr.reset();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    Bitmap selectImg = BitmapFactory.decodeStream(inStr, null, options);
                    addPic.setImageBitmap(selectImg);

Y agrega esta función a tu clase

public int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            // Calculate ratios of height and width to requested height and width
            final int heightRatio = Math.round((float) height / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);

            // Choose the smallest ratio as inSampleSize value, this will guarantee
            // a final image with both dimensions larger than or equal to the
            // requested height and width.
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }

        return inSampleSize;
    }

Para obtener más información, puede consultar http://developer.android.com/training/displaying-bitmaps/load-bitmap.html

Answer 2

Intente usar esta propiedad en su ImageButton :

<ImageButton 
     android:scaleType="fitXY"
     ... />

Espero que esto ayude :)

Answer 3

Quizás saque esto de su ImageButton xml

android:layout_weight="1"

Answer 4

Use el atributo Scale de ImageButton como:

  <ImageButton
            android:id="@+id/addImage"
            android:layout_width="0dp"
            android:layout_height="58dp"
            android:layout_weight="1"
            android:scaleType="fitXY"
            android:background="@drawable/ic_social_person" />