Java tutorial
/* * Copyright 2014 Yaroslav Mytkalyk * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.docd.purefm.ui.dialogs; import org.apache.commons.io.FileUtils; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import com.docd.purefm.Extras; import com.docd.purefm.R; import com.docd.purefm.file.GenericFile; import com.docd.purefm.utils.PFMFileUtils; import com.docd.purefm.utils.StatFsCompat; import com.docd.purefm.utils.ThemeUtils; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.DialogFragment; import android.os.AsyncTask; import android.os.Bundle; import android.view.View; import android.widget.TextView; import java.lang.ref.WeakReference; public final class PartitionInfoDialog extends DialogFragment { public static DialogFragment instantiate(final GenericFile file) { final Bundle args = new Bundle(); args.putSerializable(Extras.EXTRA_FILE, file); final PartitionInfoDialog d = new PartitionInfoDialog(); d.setArguments(args); return d; } private GenericFile mFile; private PartitionInfoTask mTask; private View mView; @Override public void onCreate(Bundle state) { super.onCreate(state); final Bundle args = this.getArguments(); if (args == null) { throw new RuntimeException( "Arguments were not supplied. The DialogFragment should be obtained by instantiate(GenericFile) method"); } this.mFile = (GenericFile) args.getSerializable(Extras.EXTRA_FILE); } public Dialog onCreateDialog(final Bundle savedInstanceState) { final Activity activity = this.getActivity(); if (activity == null || activity.isFinishing()) { return null; } //noinspection InflateParams mView = activity.getLayoutInflater().inflate(R.layout.dialog_partition_info, null); final AlertDialog.Builder builder = new AlertDialog.Builder(activity); builder.setIcon(ThemeUtils.getDrawableNonNull(activity, R.attr.ic_menu_info)); builder.setTitle(R.string.menu_partition); builder.setView(mView); builder.setNeutralButton(R.string.close, null); return builder.create(); } @Override public void onStart() { super.onStart(); if (mTask == null) { mTask = new PartitionInfoTask(mView); } if (mTask.getStatus() != AsyncTask.Status.RUNNING) { mTask.execute(mFile); } } @Override public void onStop() { super.onStop(); if (mTask != null && mTask.getStatus() == AsyncTask.Status.RUNNING) { mTask.cancel(false); } } private static final class PartitionInfo { final CharSequence mPath; final CharSequence mFsTypeText; final CharSequence mTotalBytesText; final CharSequence mBlockSizeText; final CharSequence mFreeBytesText; final CharSequence mAvailableBytesText; final CharSequence mUsedSpaceText; final long mTotalBytes; final long mBlockSize; final long mFreeBytes; final long mAvailableBytes; final long mUsedSpace; PartitionInfo(@NonNull final CharSequence path, @Nullable final CharSequence fsTypeText, final long totalBytes, final long blockSize, final long freeBytes, final long availableBytes, final long usedSpace) { this.mPath = path; this.mFsTypeText = fsTypeText; this.mTotalBytes = totalBytes; this.mBlockSize = blockSize; this.mFreeBytes = freeBytes; this.mAvailableBytes = availableBytes; this.mUsedSpace = usedSpace; this.mTotalBytesText = FileUtils.byteCountToDisplaySize(totalBytes); this.mBlockSizeText = Long.toString(blockSize); this.mFreeBytesText = FileUtils.byteCountToDisplaySize(freeBytes); this.mAvailableBytesText = FileUtils.byteCountToDisplaySize(availableBytes); if (totalBytes != 0L) { @SuppressWarnings("StringBufferReplaceableByString") final StringBuilder usage = new StringBuilder(); usage.append(FileUtils.byteCountToDisplaySize(usedSpace)); usage.append(' '); usage.append('('); usage.append(usedSpace * 100L / totalBytes); usage.append('%'); usage.append(')'); this.mUsedSpaceText = usage.toString(); } else { this.mUsedSpaceText = null; } } } private static final class PartitionInfoTask extends AsyncTask<GenericFile, Void, PartitionInfo> { private final WeakReference<View> mViewRef; PartitionInfoTask(@NonNull final View view) { this.mViewRef = new WeakReference<>(view); } @NonNull @Override protected PartitionInfo doInBackground(final GenericFile... params) { final String path = PFMFileUtils.fullPath(params[0]); final StatFsCompat statFs = new StatFsCompat(path); final long valueTotal = statFs.getTotalBytes(); final long valueAvail = statFs.getAvailableBytes(); final long valueUsed = valueTotal - valueAvail; return new PartitionInfo(path, PFMFileUtils.resolveFileSystem(path), valueTotal, statFs.getBlockSizeLong(), statFs.getFreeBytes(), valueAvail, valueUsed); } @Override protected void onPostExecute(final @NonNull PartitionInfo partitionInfo) { final View view = mViewRef.get(); if (view != null) { final TextView title = (TextView) view.findViewById(R.id.location); title.setText(partitionInfo.mPath); if (partitionInfo.mFsTypeText != null) { final TextView fs = (TextView) view.findViewById(R.id.filesystem); fs.setText(partitionInfo.mFsTypeText); } else { final View fileSystemRow = view.findViewById(R.id.filesystem_row); fileSystemRow.setVisibility(View.GONE); } if (partitionInfo.mTotalBytes != 0L) { final TextView total = (TextView) view.findViewById(R.id.total); total.setText(partitionInfo.mTotalBytesText); } if (partitionInfo.mBlockSize != 0L) { final TextView block = (TextView) view.findViewById(R.id.block_size); block.setText(partitionInfo.mBlockSizeText); } if (partitionInfo.mFreeBytes != 0L) { final TextView free = (TextView) view.findViewById(R.id.free); free.setText(partitionInfo.mFreeBytesText); } if (partitionInfo.mAvailableBytes != 0L) { final TextView avail = (TextView) view.findViewById(R.id.available); avail.setText(partitionInfo.mAvailableBytesText); } if (partitionInfo.mUsedSpace != 0L) { final TextView used = (TextView) view.findViewById(R.id.used); used.setText(partitionInfo.mUsedSpaceText); } view.findViewById(android.R.id.progress).setVisibility(View.GONE); view.findViewById(R.id.content).setVisibility(View.VISIBLE); } } } }