Android中图片处理(压缩 显示 保存).doc

package com.xikang.android.slimcoach.utils;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import com.xikang.android.slimcoach.Conf;import android.app.Activity;import android.content.ContentResolver;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.BitmapFactory.Options;import android.graphics.Matrix;import .Uri;import vider.MediaStore;import android.util.FloatMath;import android.util.Log;import android.widget.ImageView;import android.widget.Toast;public class ImageUtils private static final String TAG = ImageUtils;public static void loadImage(Activity activity, ImageView imageView, Uri uri) if (Conf.INFO)Log.i(TAG, loadImage: local uri = + uri);if (uri != null & !uri.toString().startsWith(content:/) return;try / MediaStoreString pojo = MediaStore.Images.Media.DATA ;Cursor cursor = activity.managedQuery(uri, pojo, null, null, null);if (cursor != null & cursor.moveToFirst() ContentResolver cr = activity.getContentResolver();int colunm_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);String path = cursor.getString(colunm_index);if (Conf.INFO)Log.i(TAG, loadImage: path = + path);if (path.endsWith(.jpg) | path.endsWith(.png) Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri);/imageView.setImageBitmap(getBitmap(path, 100, 200);imageView.setImageBitmap(getCompredBitmap(path); else Toast.makeText(activity, Please select image.,Toast.LENGTH_SHORT).show(); catch (Exception e) e.printStackTrace();public static Bitmap getCompredBitmap(String srcPath) return compressDef(getResizeBitmap(srcPath);/* * get bitmap compressed to 100kb * param bitmap * return */public static Bitmap getCompredDefBitmap(Bitmap bitmap) return getCompredBitmap(bitmap, 100);/* * get bitmap compressed * param bitmap * param target_size unit is kb * return */public static Bitmap getCompredBitmap(Bitmap bitmap, int target_size) return compress(bitmap, target_size);private static Bitmap compressDef(Bitmap bitmap) return compress(bitmap, 100);/* * The cycle compression specify meet the specified target size(100kb) * * param bitmap * param target_size unit is kb * return */private static Bitmap compress(Bitmap bitmap, int target_size) ByteArrayOutputStream baos = new ByteArrayOutputStream();press(Bitmap.CompressFormat.JPEG, 100, baos);int quality = 100;int length = baos.toByteArray().length / 1024;if(Conf.INFO)Log.i(TAG, compress: length = + length + kb, target_size = + target_size + kb);/ The cycle compression specify meet the specified sizewhile (length target_size) baos.reset();quality -= 10;press(Bitmap.CompressFormat.JPEG, quality, baos);length = baos.toByteArray().length / 1024;if (!bitmap.isRecycled() bitmap.recycle();byte data = baos.toByteArray();int cp_length = data.length;Log.i(TAG, compressed image length = + cp_length / 1024+ kb);return BitmapFactory.decodeByteArray(data, 0, cp_length);/* * change image size: width and height * * param options * return */private static int getSimpleSize(BitmapFactory.Options options) int w = options.outWidth;int h = options.outHeight;float hh = 800f;float ww = 480f;int scale = 1;if (w h & w ww) scale = (int) (options.outWidth / ww); else if (w hh) scale = (int) (options.outHeight / hh);if (scale yScale ? xScale : yScale;op.inJustDecodeBounds = false;bmp = BitmapFactory.decodeFile(path, op);return bmp;public static Bitmap getBitmap2(String path, int width, int height) BitmapFactory.Options op = new BitmapFactory.Options();op.inJustDecodeBounds = true;Bitmap bmp = BitmapFactory.decodeFile(path, op);/ 编码后bitmap的宽高,bitmap除以屏幕宽度得到压缩比int widthRatio = (int) FloatMath.ceil(op.outWidth / (float) width);int heightRatio = (int) FloatMath.ceil(op.outHeight / (float) height);if (widthRatio 1 & heightRa