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
0 Response to "Reduce bitmap by setting inSampleSize of BitmapFactory.Options"
Posting Komentar