Add space usage bar to data folder dialog

This displays a progress bar with the amount of used/free space in each
storage location to make it easier to identify storage devices. This is
particularly useful for devices that use non-standard names.

Reference: #3049

app/src/main/java/de/danoeh/antennapod/adapter/DataFolderAdapter.java

@@ -20,6 +20,7 @@ import de.danoeh.antennapod.core.preferences.UserPreferences;
 import de.danoeh.antennapod.core.util.Converter;
 import de.danoeh.antennapod.core.util.StorageUtils;
 import de.danoeh.antennapod.dialog.ChooseDataFolderDialog;
+import me.zhanghai.android.materialprogressbar.MaterialProgressBar;
 
 
 public class DataFolderAdapter extends RecyclerView.Adapter<DataFolderAdapter.ViewHolder> {
@@ -47,6 +48,7 @@ public class DataFolderAdapter extends RecyclerView.Adapter<DataFolderAdapter.Vi
         StoragePath storagePath = entries.get(position);
         holder.path.setText(storagePath.getShortPath());
         holder.size.setText(Converter.byteToString(storagePath.getAvailableSpace()));
+        holder.progressBar.setProgress(storagePath.getUsagePercentage());
         holder.root.setOnClickListener((View v) -> selectAndDismiss(storagePath));
         holder.radioButton.setOnClickListener((View v) -> selectAndDismiss(storagePath));
         if (storagePath.getFullPath().equals(currentPath)) {
@@ -98,6 +100,7 @@ public class DataFolderAdapter extends RecyclerView.Adapter<DataFolderAdapter.Vi
         private TextView path;
         private TextView size;
         private RadioButton radioButton;
+        private MaterialProgressBar progressBar;
 
         ViewHolder(View itemView) {
             super(itemView);
@@ -105,6 +108,7 @@ public class DataFolderAdapter extends RecyclerView.Adapter<DataFolderAdapter.Vi
             path = itemView.findViewById(R.id.path);
             size = itemView.findViewById(R.id.size);
             radioButton = itemView.findViewById(R.id.radio_button);
+            progressBar = itemView.findViewById(R.id.used_space);
         }
     }
 
@@ -127,5 +131,13 @@ public class DataFolderAdapter extends RecyclerView.Adapter<DataFolderAdapter.Vi
         long getAvailableSpace() {
             return StorageUtils.getFreeSpaceAvailable(path);
         }
+
+        long getTotalSpace() {
+            return StorageUtils.getTotalSpaceAvailable(path);
+        }
+
+        int getUsagePercentage() {
+            return 100 - (int) (100 * getAvailableSpace() / (float) getTotalSpace());
+        }
     }
 }

app/src/main/res/layout/choose_data_folder_dialog_entry.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/root"
     android:layout_width="match_parent"
@@ -35,6 +36,13 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             tools:text="2 GB" />
+
+        <me.zhanghai.android.materialprogressbar.MaterialProgressBar
+            android:id="@+id/used_space"
+            style="@style/Widget.MaterialProgressBar.ProgressBar.Horizontal"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:mpb_progressStyle="horizontal" />
     </LinearLayout>
 
 </RelativeLayout>

core/src/main/java/de/danoeh/antennapod/core/util/StorageUtils.java

@@ -74,4 +74,18 @@ public class StorageUtils {
         }
         return availableBlocks * blockSize;
     }
+
+    public static long getTotalSpaceAvailable(String path) {
+        StatFs stat = new StatFs(path);
+        long blockCount;
+        long blockSize;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
+            blockCount = stat.getBlockCountLong();
+            blockSize = stat.getBlockSizeLong();
+        } else {
+            blockCount = stat.getBlockCount();
+            blockSize = stat.getBlockSize();
+        }
+        return blockCount * blockSize;
+    }
 }