android生成缩略图

package com.forwork.thumbnail;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.util.Log;

public class Thumbnail extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

try {

saveMyBitmap("ooo");

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

public void saveMyBitmap(String bitName) throws IOException {

File originalFile = new File("sdcard/pic/ll.jpg");

Bitmap bmp = decodeFile(originalFile);

File f = new File("/sdcard/" + bitName + ".jpg");

f.createNewFile();

FileOutputStream fOut = null;

try {

fOut = new FileOutputStream(f);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

//BitmapFactory.Options options=new BitmapFactory.Options();

//options.inSampleSize = 10;

//options.inTempStorage = new byte[16*1024];

//Bitmap bmp = BitmapFactory.decodeFile("/sdcard/pic/sd.jpg");

//Bitmap bmp = BitmapFactory.decodeFile("/sdcard/pic/ll.jpg", options);

//bmp = Bitmap.createScaledBitmap(bmp, 800, 480, true);

bmp.compress(Bitmap.CompressFormat.JPEG, 30, fOut);

try {

fOut.flush();

} catch (IOException e) {

e.printStackTrace();

}

try {

fOut.close();

} catch (IOException e) {

e.printStackTrace();

}

//decodes image and scales it to reduce memory consumption

private Bitmap decodeFile(File f){

try {

//Decode image size

BitmapFactory.Options o = new BitmapFactory.Options();

o.inJustDecodeBounds = true;

BitmapFactory.decodeStream(new FileInputStream(f),null,o);

//The new size we want to scale to

final int REQUIRED_HEIGHT=800;

final int REQUIRED_WIDTH=480;

//Find the correct scale value. It should be the power of 2.

int width_tmp=o.outWidth, height_tmp=o.outHeight;

System.out.println(width_tmp+" "+height_tmp);

Log.w("===", (width_tmp+" "+height_tmp));

int scale=1;

while(true){

if(width_tmp/2<REQUIRED_WIDTH && height_tmp/2<REQUIRED_HEIGHT)

break;

width_tmp/=2;

height_tmp/=2;

scale++;

Log.w("===", scale+"''"+width_tmp+" "+height_tmp);

}

//Decode with inSampleSize

BitmapFactory.Options o2 = new BitmapFactory.Options();

o2.inSampleSize=scale;

return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);

} catch (FileNotFoundException e) {}

return null;

}

android生成缩略图

android生成缩略图

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