标签:android style blog http color os io strong 文件
从ImageView中获取图像并保存。
1 saveImg.setOnClickListener(new OnClickListener() { 2 public void onClick(View v) { 3 // 新建一个文件保存照片 4 // f = new File(GlobalData.Car273File + "/saved/" + System.currentTimeMillis() + ".jpg"); 6 File f=getFilePath(GlobalData.Car273File + "/saved/", System.currentTimeMillis() + ".jpg"); 7 try { 8 // ImageView对象(view)必须做如下设置后,才能获取其中的图像 9 itemView.setDrawingCacheEnabled(true); 10 Bitmap temp = Bitmap.createBitmap(itemView 11 .getDrawingCache()); 12 itemView.setDrawingCacheEnabled(false); 13 ImageUtil.saveMyBitmap(f, temp); 14 //显示自定义toast 15 Toast toast=new Toast(ShowCarImageActivity.this); 16 View view=LayoutInflater.from(ShowCarImageActivity.this).inflate(R.layout.toast_custom_saved,null); 17 toast.setDuration(Toast.LENGTH_SHORT); 18 toast.setGravity(Gravity.CENTER,0, 100); 19 toast.setView(view); 20 toast.show(); 21 // Car273Util.showToast(ShowCarImageActivity.this, 22 // "图片已保存到" + f.getParentFile().getAbsolutePath() 23 // + "下"); 24 } catch (IOException e) { 25 e.printStackTrace(); 26 } 27 dismiss(); 28 } 29 });
此处要注意的是:在android4.0的手机上直接创建某个文件的路径一直报这个错:open failed: ENOENT (No such file or directory).例如第4行直接new出一个文件。
如果在FileOutputStream创建一个流文件路径时或者是对一个File文件路径直接操作时,可先创建文件的路径,然后在创建文件名就不会在报该错误。例如第6行的方式。
public static File getFilePath(String filePath, String fileName) { File file = null; makeRootDirectory(filePath); try { file = new File(filePath + fileName); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return file; } public static void makeRootDirectory(String filePath) { File file = null; try { file = new File(filePath); if (!file.exists()) { file.mkdir(); } } catch (Exception e) { } }
1 /** 保存图片方法 **/ 2 public static void saveMyBitmap(File f, Bitmap mBitmap) throws IOException { 3 try { 4 5 f.createNewFile(); 6 FileOutputStream fOut = null; 7 fOut = new FileOutputStream(f); 8 int width = mBitmap.getWidth(); 9 int height = mBitmap.getHeight(); 10 // 计算缩放的比例 11 int finalWidth = 800; 12 int finalHeight = (int) (finalWidth * 1.0 * (height * 1.0 / width * 1.0)); 13 double x = width * finalHeight; 14 double y = height * finalWidth; 15 16 if (x > y) { 17 finalHeight = (int) (y / (double) width); 18 } else if (x < y) { 19 finalWidth = (int) (x / (double) height); 20 } 21 22 if (finalWidth > width && finalHeight > height) { 23 finalWidth = width; 24 finalHeight = height; 25 } 26 Matrix matrix = new Matrix(); 27 matrix.reset(); 28 // 计算宽高缩放率 29 float scaleWidth = ((float) finalWidth) / (float) width; 30 float scaleHeight = ((float) finalHeight) / (float) height; 31 // 缩放图片动作 32 matrix.postScale(scaleWidth, scaleHeight); 33 mBitmap = Bitmap.createBitmap(mBitmap, 0, 0, (int) width, 34 (int) height, matrix, true); 35 mBitmap.compress(Bitmap.CompressFormat.JPEG, 80, fOut); 36 fOut.flush(); 37 fOut.close(); 38 // 回收内存空间 39 mBitmap.recycle(); 40 System.gc(); 41 } catch (FileNotFoundException e) { 42 e.printStackTrace(); 43 } catch (IOException e) { 44 e.printStackTrace(); 45 } 46 }
自定义Toast布局文件:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" > <LinearLayout android:layout_width="133dp" android:layout_height="133dp" android:background="@drawable/toast_bg" android:gravity="center" android:orientation="vertical" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="23dp" android:layout_marginBottom="10dp" android:src="@drawable/saveimg_success" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/white" android:gravity="center" android:textSize="16sp" android:layout_marginBottom="15dp" android:text="@string/saved_picture_tosdcad"/> </LinearLayout> </LinearLayout>
标签:android style blog http color os io strong 文件
原文地址:http://www.cnblogs.com/ws5861/p/3936623.html