Android中图片处理（压缩 保存 显示 截屏 视图转为图片）函数工具类
调用示例：
void shareShotScreen() {
LinearLayout layout = (LinearLayout) findViewById(R.id.plan_layout);
Bitmap bitmap = ImageUtils.convertBitmap(layout);
String path = ImageUtils.saveImage25(bitmap);
ShareUtils.ShareImage(this, "share plan", "slim plan", "share slim plan...........", path);
}
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.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.net.Uri;
import android.provider.MediaStore;
import android.text.Layout;
import android.util.FloatMath;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.view.View.MeasureSpec;
import android.widget.ImageView;
import android.widget.Toast;
public class ImageUtils {
private static final String TAG = "ImageUtils";
public static Bitmap 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 null;
}
Bitmap bitmap = null;
try {
// MediaStore
String[] 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 = BitmapFactory.decodeStream(cr.openInputStream(uri));
bitmap = getCompredBitmap(path);
// imageView.setImageBitmap(getBitmap(path, 100, 200));
imageView.setImageBitmap(bitmap);
} else {
Toast.makeText(activity, "Please select image...",
Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
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();
bitmap.compress(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 size
while (length > target_size) {
baos.reset();
quality -= 10;
bitmap.compress(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 < h && h > hh) {
scale = (int) (options.outHeight / hh);
}
if (scale <= 0)
scale = 1;
return scale;
}
public static Bitmap getResizeBitmap(String srcPath) {
BitmapFactory.Options newOpts = new BitmapFactory.Options();
// start parse image only width and height, set
// options.inJustDecodeBounds to true
newOpts.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
newOpts.inSampleSize = getSimpleSize(newOpts);
newOpts.inJustDecodeBounds = false;
// restart parse image all info, set options.inJustDecodeBounds as true
bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
return bitmap;
}
/**
* save bitmap 100%
* @param bitmap
* @return save path
*/
public static String saveImage(Bitmap bitmap){
return saveImage(bitmap, 100);
}
/**
* save bitmap 50%
* @param bitmap
* @return save path
*/
public static String saveImage50(Bitmap bitmap){
return saveImage(bitmap, 50);
}
/**
* save bitmap 25%
* @param bitmap
* @return save path
*/
public static String saveImage25(Bitmap bitmap){
return saveImage(bitmap, 25);
}
/**
* save bitmap
* @param bitmap
* @param quality bitmap quality(1-100)
* @return
*/
public static String saveImage(Bitmap bitmap, int quality) {
String fileName = "slim_" + System.currentTimeMillis() + ".jpg";
String filePath = Conf.getImagePath() + fileName;
String path = null;
try {
File file = new File(filePath);
FileOutputStream out = new FileOutputStream(file);
if (bitmap.compress(Bitmap.CompressFormat.JPEG, quality, out)) {
Log.d(TAG, "saveImage seccess: fileName= " + filePath + ", quality = " + quality);
out.flush();
out.close();
path = filePath;
} else {
Log.d(TAG, "saveImage fail: fileName= " + filePath);
}
} catch (Exception e) {
Log.d(TAG, "saveImage Exception: " + e);
e.printStackTrace();
}
return path;
}
public static void transImage(String fromFile, String toFile, int width,
int height, int quality) {
try {
Bitmap bitmap = BitmapFactory.decodeFile(fromFile);
int bitmapWidth = bitmap.getWidth();
int bitmapHeight = bitmap.getHeight();
// scaling proportion
float scaleWidth = (float) width / bitmapWidth;
float scaleHeight = (float) height / bitmapHeight;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
// resizeBitmap
Bitmap resizeBitmap = Bitmap.createBitmap(bitmap, 0, 0,
bitmapWidth, bitmapHeight, matrix, false);
// save file
File myCaptureFile = new File(toFile);
FileOutputStream out = new FileOutputStream(myCaptureFile);
if (resizeBitmap.compress(Bitmap.CompressFormat.JPEG, quality, out)) {
out.flush();
out.close();
}
// Release memory resources
if (!bitmap.isRecycled()) {
bitmap.recycle();
}
if (!resizeBitmap.isRecycled()) {
resizeBitmap.recycle();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
}
/**
* 直接载入图片
*
* @param path
* @return
*/
public static Bitmap getBitmap(String path) {
return BitmapFactory.decodeFile(path);
}
/**
* get resized (kb) bitmap
*
* @param path
* @param size
* unit is kb
* @return
*/
public static Bitmap getBitmap(String path, int inSampleSize) {
Options op = new Options();
op.inSampleSize = inSampleSize;
return BitmapFactory.decodeFile(path, op);
}
/**
* 按寬高壓縮載入圖片
*
* @param path
* @param width
* @param heigh
* @return
*/
public static Bitmap getBitmap(String path, int width, int heigh) {
Options op = new Options();
op.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(path, op);
int xScale = op.outWidth / width;
int yScale = op.outHeight / heigh;
op.inSampleSize = xScale > 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 && heightRatio > 1) {
if (widthRatio > heightRatio) {
// 压缩到原来的(1/widthRatios)
op.inSampleSize = widthRatio;
} else {
op.inSampleSize = heightRatio;
}
}
op.inJustDecodeBounds = false;
bmp = BitmapFactory.decodeFile(path, op);
return bmp;
}
/**
* 截取可见屏幕部分视图
* @param activity
* @return
*/
public static Bitmap shotScreen(Activity activity) {
View view = activity.getWindow().getDecorView();
Display display = activity.getWindowManager().getDefaultDisplay();
view.layout(0, 0, display.getWidth(), display.getHeight());
// 允许当前窗口保存缓存信息，这样getDrawingCache()方法才会返回一个Bitmap
view.setDrawingCacheEnabled(true);
Bitmap bmp = Bitmap.createBitmap(view.getDrawingCache());
return bmp;
}
/**
* 截取view的根层可见屏幕部分的视图
* @param activity
* @return
*/
public static Bitmap getRootViewBitmap(View view) {
return shotViewBitmap(view.getRootView());
}
/**
* 截取可见屏幕部分的view视图
* @param activity
* @return
*/
public static Bitmap shotViewBitmap(View v) {
v.clearFocus();
v.setPressed(false);
Bitmap bmp = null;
try {
v.layout(0, 0, v.getWidth(), v.getHeight());
// 允许当前窗口保存缓存信息，这样getDrawingCache()方法才会返回一个Bitmap
v.setDrawingCacheEnabled(true);
v.buildDrawingCache();
bmp = Bitmap.createBitmap(v.getDrawingCache());
} catch (Exception e) {
e.printStackTrace();
}
return bmp;
}
/**
* convert view to integral bitmap and return it
* 获取view的完整视图图片（即使没有显示出来的部分）
* @param view : view or layout
* @return
*/
public static Bitmap convertBitmap(View view){
return convertViewToBitmap(view, view.getWidth(), view.getHeight());
}
/**
* convert measured view to integral bitmap and return it
* 通过计算的方法宽高后，获取view的完整视图图片（即使没有显示出来的部分）
* @param view : view or layout
* @return
*/
public static Bitmap convertMeasureBitmap(View view){
view.measure(MeasureSpec.makeMeasureSpec(view.getWidth(), MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(view.getHeight(), MeasureSpec.AT_MOST));
return convertViewToBitmap(view, view.getMeasuredWidth(), view.getMeasuredHeight());
}
/**
* convert view to bitmap according to with and height
* @param view
* @param width
* @param height
* @return
*/
public static Bitmap convertViewToBitmap(View view, int width, int height){
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
view.draw(new Canvas(bitmap));
return bitmap;
}
}
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