Android:src setImageResource setImageBitmap setImageDrawable

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Android setImageResource setImageBitmap setImageDrawable

ImageView: Working With Android:src, setImageResource, setImageDrawable and setImageBitmap

This tutorial adapted from http://android-coding.blogspot.my/2013/12/setimagedrawable-vs-setimageresource-vs.html 

1) Create a New Empty Android Project.

2) Edit Layout File

activity_main.xml

<ScrollView    xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/scroll"    android:layout_width="fill_parent"    android:layout_height="wrap_content"> <LinearLayout    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:scrollbars="vertical"    >    <!--        android:src            Sets a drawable as the content of this ImageView.            May be a reference to another resource, in the form "@[+][package:]type:name"            or to a theme attribute in the form "?[package:][type:]name".            May be a color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".            This corresponds to the global attribute resource symbol src.    -->    <!-- Set ImageView image by XML-->    <ImageView        android:id="@+id/iv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/android"        android:padding="3dp"        />    <!-- Set ImageView image programmatically-->    <ImageView        android:id="@+id/iv2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="3dp"        />    <!-- Set ImageView image as drawable programmatically-->    <ImageView        android:id="@+id/iv3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="3dp"        />    <!-- Set ImageView image as bitmap programmatically-->    <ImageView        android:id="@+id/iv4"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="3dp"        /> </LinearLayout>    </ScrollView>

3) Edit Controller File

MainActivity.java

package com.notarazi.myimageview1; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.widget.ImageView; public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // Get the widgets reference from XML layout        ImageView iv = (ImageView) findViewById(R.id.iv);        ImageView iv2 = (ImageView) findViewById(R.id.iv2);        ImageView iv3 = (ImageView) findViewById(R.id.iv3);        ImageView iv4 = (ImageView) findViewById(R.id.iv4);        /*            setImageResource (int resId)                Sets a drawable as the content of this ImageView.                Parameters                    resId : the resource identifier of the drawable                This does Bitmap reading and decoding on the UI thread, which can cause                a latency hiccup. If that's a concern, consider using                setImageDrawable(android.graphics.drawable.Drawable) or                setImageBitmap(android.graphics.Bitmap) and BitmapFactory instead.         */        // Set an image for second ImageView        iv2.setImageResource(R.drawable.android);        // Set image as drawable for third ImageView        iv3.setImageDrawable(getResources().getDrawable(R.drawable.android));        /*             Bitmap decodeResource (Resources res, int id)                Synonym for decodeResource(Resources, int, android.graphics.BitmapFactory.Options) with null Options.                Parameters                    res : The resources object containing the image data                    id : The resource id of the image data                Returns                    The decoded bitmap, or null if the image could not be decoded.         */        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.android);        // Set image as bitmap for fourth ImageView        iv4.setImageBitmap(bitmap);    } }

4) Outcome.

5) Further Reading

1) src=Sets a drawable as the content of this ImageView. Refer http://developer.android.com/reference/android/widget/ImageView.html#attr_android:src 

2) setImageResource = Sets a drawable as the content of this ImageView. (This does Bitmap reading and decoding on the UI thread, which can cause a latency hiccup) Referhttp://developer.android.com/reference/android/widget/ImageView.html#setImageResource(int) 

3) setImageDrawable = Sets a drawable as the content of this ImageView. Refer http://developer.android.com/reference/android/widget/ImageView.html#setImageDrawable(android.graphics.drawable.Drawable) 

4) setBitmapDrawable = Sets a Bitmap as the content of this ImageView. Referhttp://developer.android.com/reference/android/widget/ImageView.html#setImageBitmap(android.graphics.Bitmap) 

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