如何将图像保存到SD卡上的按钮，点击机器人 [英] How to save the image to SD card on button Click android

问题描述

我正在使用的ImageView和1 XML一个按钮，我从web服务器retriving的图像，URL和ImageView的显示出来。现在，如果按钮（保存）被点击我需要特定的图像保存到SD卡上。如何做到这一点？

I am using an Imageview and a Button in 1 XML, and I am retriving the images as URL from webServer and displaying it on the ImageView. Now if the Button(Save) is clicked I need to save that particular image into SD card. How to do this?

注：present图像应保存

NOTE: Present Image Should be saved.

推荐答案

首先，你需要得到你的位图。你已经可以把它作为一个对象位图，或者你可以尝试从ImageView的，如得到它：

First, you need to get your Bitmap. You can already have it as an object Bitmap, or you can try to get it from the ImageView such as:

    BitmapDrawable drawable = (BitmapDrawable) mImageView1.getDrawable();
    Bitmap bitmap = drawable.getBitmap();

然后，你一定要到目录（文件对象），从SD卡，如：

Then you must get to directory (a File object) from SD Card such as:

    File sdCardDirectory = Environment.getExternalStorageDirectory();

接下来，创建特定的文件存储图像：

Next, create your specific file for image storage:

    File image = new File(sdCardDirectory, "test.png");

在此之后，你只需要编写位图得益于其方法<一href="http://developer.android.com/reference/android/graphics/Bitmap.html#com$p$pss%28android.graphics.Bitmap.Com$p$pssFormat,%20int,%20java.io.OutputStream%29">com$p$pss如：

    boolean success = false;

    // Encode the file as a PNG image.
    FileOutputStream outStream;
    try {

        outStream = new FileOutputStream(image);
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream); 
        /* 100 to keep full quality of the image */

        outStream.flush();
        outStream.close();
        success = true;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

最后，只是处理的布尔结果如果需要的话。如：

Finally, just deal with the boolean result if needed. Such as:

    if (success) {
        Toast.makeText(getApplicationContext(), "Image saved with success",
                Toast.LENGTH_LONG).show();
    } else {
        Toast.makeText(getApplicationContext(),
                "Error during image saving", Toast.LENGTH_LONG).show();
    }

不要忘记添加以下权限在你的清单：

Don't forget to add the following permission in your Manifest:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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