How to create button in Android's behind code?

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How to create button in Android's behind code?

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#1 by (5 votes)

4

I'm developing an application where I download some images from the internet when the application is opened.

I want, when I have these images downloaded, create a button for each image and put it in the background. But since I do not know how many images I'm going to download, I can not create the buttons in XML. I wanted to create it in java. How do I do this?

With cicero's answer worked, I'm just having a problem the image got bigger than the screen and it's being cropped, how can I reduce it inside the code or just deal with it before putting it in the code?

java android

asked by anonymous 18.12.2014 / 20:09

1 answer

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score 5 · Accepted Answer

You can do both forms, both in XML and via code.

The advantage of being via XML is that you do not write so much in the code.

ImageButton:

ImageButton imageButton = new ImageButton(this);
    imageButton.setBackgroundColor(getResources().getColor(android.R.color.transparent));

    File file = new File("caminho para a imagem");
    Bitmap bmImg = BitmapFactory.decodeFile(file.getPath());
    imageButton.setImageBitmap(bmImg);

    //Se quiser algum tamanho especifico
    ViewGroup.LayoutParams layoutParams = new ActionBar.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    imageButton.setLayoutParams(layoutParams);

        //aí você adiciona essa imagem onde quiser, num ViewGroup
        layoutPai.addView(imageButton);

Via XLM:

Imagebutton.xml file

<?xml version="1.0" encoding="utf-8"?>
<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@android:color/transparent"
    android:id="@+id/imageButton" />

In the code:

 ImageButton imageButton = (ImageButton)LayoutInflater.from(this).inflate(R.layout.imagebutton, null);

where it is null above, you can pass the parent, which will be ViewGroup

File file = new File("caminho para a imagem");
Bitmap bmImg = BitmapFactory.decodeFile(file.getPath());
imageButton.setImageBitmap(bmImg);

//aí você adiciona essa imagem onde quiser, num ViewGroup
layoutPai.addView(imageButton);