How to save image from drawable resource to sd card?

问题

So, i have a view like on the image below. Plus I will add a Save button. You can also see my XML file. I am using this code to load image from drawable folder by pressing the next and previous buttons:

public void onClick(View v) {
        switch (v.getId()){

        case R.id.bNext:
            a++;
            setImage(a);
            break;
        case R.id.bPrevious:
            if(a>0)
            {
                a--;
                setImage(a);  
                break;
            }
        }
    }
    private void setImage(int a){
        if (a == 0)
        {
        slika.setImageResource(R.drawable.l2);
        a = 1;
        }
        else if (a == 1)
        {
        slika.setImageResource(R.drawable.l3);
        a = 2;
        }
        else if (a == 2)
        {
        slika.setImageResource(R.drawable.l4);
        a = 3;
        }
        else if (a == 3)
        {
        slika.setImageResource(R.drawable.l5);
        a = 4;
        }
        else if (a == 4)
        {
        slika.setImageResource(R.drawable.l6);
        a = 5;
        }
.
.
.
.
.
        else if (a == 55)
        {
        slika.setImageResource(R.drawable.l57);
        a = 56;
        }
        }

I need to save the image that is currently on the screen. I found some answers on stackoverflow, but those are all for specific image with known name. I don't know what image a user will want to save.

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        android:gravity="center">

                <ImageView
            android:id="@+id/imageView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_centerHorizontal="true"/>

        <Button
            android:id="@+id/bMenu"
            android:layout_width="80dp"
            android:layout_height="35dp"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="120dp"
            android:background="@drawable/buttons"
            android:gravity="center"
            android:padding="0dp"
            android:text="Menu"
            android:textColor="#ffffff"
            android:textSize="23dp" />

        <Button
            android:id="@+id/bNext"
            android:layout_width="80dp"
            android:layout_height="35dp"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="220dp"
            android:background="@drawable/buttons"
            android:padding="0dp"
            android:text="Next"
            android:textSize="23dp"
            android:textColor="#ffffff" />

        <Button
            android:id="@+id/bPrevious"
            android:layout_width="80dp"
            android:layout_height="35dp"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="20dp"
            android:background="@drawable/buttons"
            android:gravity="center"
            android:padding="0dp"
            android:text="Previous"
            android:textColor="#ffffff"
            android:textSize="23dp" />

    </RelativeLayout>

回答1:

  void Save(){  
String folder = "/sdcard/Pictures/MyAppFolder";
       Imageview  view = (ImageView)findViewById(R.id.cachesView);

          view.buildDrawingCache(); 

        Bitmap yourBitmap = view.getDrawingCache();  
          final File myDir = new File(folder);
                myDir.mkdirs();
                final Random generator = new Random();
                int n = 10000;
                n = generator.nextInt(n);
                final String fname = "StyleMe-" + n + ".png";
                File file = new File(myDir, fname);
                if (file.exists())
                    FileOutputStream out = new FileOutputStream(file);
                    yourBitmap.compress(CompressFormat.JPEG, 100, out);
                    out.flush();
                    out.close();
                    sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
                            Uri.parse("file://"
                                    + Environment.getExternalStorageDirectory()))); // this will refresh the gallery app.
                    Toast.makeText(getApplication(), "Image Saved", Toast.LENGTH_SHORT)
                            .show();
    }

please see

add this method in your class and on click button put

Save();

来源：https://stackoverflow.com/questions/17680743/how-to-save-image-from-drawable-resource-to-sd-card