Reduce bitmap by setting inSampleSize of BitmapFactory.Options
if inSampleSize of BitmapFactory.Options set to a value > 1, requests the decoder to subsample the original image, returning a smaller image to save memory. The sample size is the number of pixels in either dimension that correspond to a single pixel in the decoded bitmap. For example, inSampleSize == 4 returns an image that is 1/4 the width/height of the original, and 1/16 the number of pixels. Any value <= 1 is treated the same as 1.Note: the decoder will try to fulfill this request, but the resulting bitmap may have different dimensions that precisely what has been requested. ~ in my testing, both 1/2 and 1/3 have the same size bitmap generated.
Also, powers of 2 are often faster/easier for the decoder to honor.
This example demonstrate how to create a resized bitmap by user setting.
package com.AndroidResizeBigPicture;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
public class AndroidResizeBigPictureActivity extends Activity {
SeekBar resizeBar;
TextView resizeLevel;
ImageView imageView;
Bitmap bitmap_Source;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
resizeBar = (SeekBar)findViewById(R.id.resizebar);
resizeLevel = (TextView)findViewById(R.id.resizelevel);
imageView = (ImageView)findViewById(R.id.imageview);
resizeBar.setOnSeekBarChangeListener(resizeBarChangeListener);
bitmap_Source = BitmapFactory.decodeResource(getResources(), R.drawable.testpicture);
}
OnSeekBarChangeListener resizeBarChangeListener
= new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
// TODO Auto-generated method stub
int ratio = (int)java.lang.Math.pow(2, progress);
imageView.setImageBitmap(resize(ratio));
resizeLevel.setText("ratio: 1/" + ratio);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}};
private Bitmap resize(int ratio){
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inSampleSize = ratio;
bmpFactoryOptions.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(getResources(), R.drawable.testpicture, bmpFactoryOptions);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<SeekBar
android:id="@+id/resizebar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="4"
android:progress="0"
android:layout_margin="10dp"/>
<TextView
android:id="@+id/resizelevel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="ratio: 1/1"/>
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="center"
android:src="@drawable/testpicture"/>
</LinearLayout>
</ScrollView>
</HorizontalScrollView>
</LinearLayout>
Notice: You have to place your testpicture.jpg in /res/drawable/ folder.
Next:
- Auto resize to fit View
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