保存图片文件到本地

从ImageView中获取图像并保存。

          saveImg.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    // 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");
                    try {
                        // ImageView对象(view)必须做如下设置后，才能获取其中的图像
                        itemView.setDrawingCacheEnabled(true);
                        Bitmap temp = Bitmap.createBitmap(itemView
                                .getDrawingCache());
                        itemView.setDrawingCacheEnabled(false);
                        ImageUtil.saveMyBitmap(f, temp);

                          //发送广播通知系统更新图库                          

                            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
                            Uri.parse("file://"+f.getAbsolutePath()))); 

                        //显示自定义toast
                        Toast toast=new Toast(ShowCarImageActivity.this);
                        View view=LayoutInflater.from(ShowCarImageActivity.this).inflate(R.layout.toast_custom_saved,null);
                        toast.setDuration(Toast.LENGTH_SHORT);
                        toast.setGravity(Gravity.CENTER,0, 100);
                        toast.setView(view);
                        toast.show();
//                        Car273Util.showToast(ShowCarImageActivity.this,
//                                "图片已保存到" + f.getParentFile().getAbsolutePath()
//                                        + "下");
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    dismiss();
                }
            });

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) {

        }
    }

    /** 保存图片方法 **/
    public static void saveMyBitmap(File f, Bitmap mBitmap) throws IOException {
        try {

            f.createNewFile();
            FileOutputStream fOut = null;
            fOut = new FileOutputStream(f);
            int width = mBitmap.getWidth();
            int height = mBitmap.getHeight();
            // 计算缩放的比例
            int finalWidth = 800;
            int finalHeight = (int) (finalWidth * 1.0 * (height * 1.0 / width * 1.0));
            double x = width * finalHeight;
            double y = height * finalWidth;

            if (x > y) {
                finalHeight = (int) (y / (double) width);
            } else if (x < y) {
                finalWidth = (int) (x / (double) height);
            }

            if (finalWidth > width && finalHeight > height) {
                finalWidth = width;
                finalHeight = height;
            }
            Matrix matrix = new Matrix();
            matrix.reset();
            // 计算宽高缩放率
            float scaleWidth = ((float) finalWidth) / (float) width;
            float scaleHeight = ((float) finalHeight) / (float) height;
            // 缩放图片动作
            matrix.postScale(scaleWidth, scaleHeight);
            mBitmap = Bitmap.createBitmap(mBitmap, 0, 0, (int) width,
                    (int) height, matrix, true);
            mBitmap.compress(Bitmap.CompressFormat.JPEG, 80, fOut);
            fOut.flush();
            fOut.close();
            // 回收内存空间
            mBitmap.recycle();
            System.gc();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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>