保存图片文件到本地

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>