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Merge pull request afollestad#861 from jmartingit/master
new File Chooser Dialog
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‎commons/src/main/java/com/afollestad/materialdialogs/folderselector/FileChooserDialog.java

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package com.afollestad.materialdialogs.folderselector;
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import android.Manifest;
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import android.app.Activity;
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import android.app.Dialog;
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import android.content.pm.PackageManager;
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import android.os.Build;
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import android.os.Bundle;
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import android.os.Environment;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import android.support.annotation.StringRes;
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import android.support.v4.app.ActivityCompat;
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import android.support.v4.app.DialogFragment;
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import android.support.v4.app.Fragment;
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import android.support.v7.app.AppCompatActivity;
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import android.view.View;
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import android.webkit.MimeTypeMap;
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import com.afollestad.materialdialogs.DialogAction;
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import com.afollestad.materialdialogs.MaterialDialog;
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import com.afollestad.materialdialogs.commons.R;
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import java.io.File;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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public class FileChooserDialog extends DialogFragment implements MaterialDialog.ListCallback {
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private final static String TAG = "[MD_FILE_SELECTOR]";
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private File parentFolder;
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private File[] parentContents;
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private boolean canGoUp = true;
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private FileCallback mCallback;
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public interface FileCallback {
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void onFileSelection(File file);
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}
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public FileChooserDialog() {
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}
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String[] getContentsArray() {
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if (parentContents == null) return new String[]{};
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String[] results = new String[parentContents.length + (canGoUp ? 1 : 0)];
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if (canGoUp) results[0] = "...";
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for (int i = 0; i < parentContents.length; i++)
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results[canGoUp ? i + 1 : i] = parentContents[i].getName();
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return results;
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}
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File[] listFiles(String mimeType) {
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File[] contents = parentFolder.listFiles();
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List<File> results = new ArrayList<>();
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if (contents != null) {
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MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
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for (File fi : contents) {
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if (fi.isDirectory()) {
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results.add(fi);
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} else {
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if (fileIsMimeType(fi, mimeType, mimeTypeMap)) {
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results.add(fi);
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}
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}
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}
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Collections.sort(results, new FileSorter());
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return results.toArray(new File[results.size()]);
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}
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return null;
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}
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boolean fileIsMimeType(File file, String mimeType, MimeTypeMap mimeTypeMap) {
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if (mimeType == null || mimeType.equals("*/*")) {
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return true;
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} else {
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// get the file mime type
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String filename = file.toURI().toString();
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int dotPos = filename.lastIndexOf('.');
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if (dotPos == -1) {
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return false;
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}
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String fileExtension = filename.substring(dotPos + 1);
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String fileType = mimeTypeMap.getMimeTypeFromExtension(fileExtension);
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if (fileType == null) {
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return false;
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}
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// check the 'type/subtype' pattern
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if (fileType.equals(mimeType)) {
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return true;
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}
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// check the 'type/*' pattern
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int mimeTypeDelimiter = mimeType.lastIndexOf('/');
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if (mimeTypeDelimiter == -1) {
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return false;
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}
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String mimeTypeMainType = mimeType.substring(0, mimeTypeDelimiter);
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String mimeTypeSubtype = mimeType.substring(mimeTypeDelimiter + 1);
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if (!mimeTypeSubtype.equals("*")) {
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return false;
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}
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int fileTypeDelimiter = fileType.lastIndexOf('/');
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if (fileTypeDelimiter == -1 ) {
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return false;
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}
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String fileTypeMainType = fileType.substring(0, fileTypeDelimiter);
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if (fileTypeMainType.equals(mimeTypeMainType)) {
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return true;
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}
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}
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return false;
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}
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@SuppressWarnings("ConstantConditions")
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@NonNull
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@Override
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public Dialog onCreateDialog(Bundle savedInstanceState) {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
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ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE) !=
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PackageManager.PERMISSION_GRANTED) {
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return new MaterialDialog.Builder(getActivity())
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.title(R.string.md_error_label)
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.content(R.string.md_storage_perm_error)
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.positiveText(android.R.string.ok)
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.build();
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}
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if (getArguments() == null || !getArguments().containsKey("builder"))
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throw new IllegalStateException("You must create a FileChooserDialog using the Builder.");
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if (!getArguments().containsKey("current_path"))
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getArguments().putString("current_path", getBuilder().mInitialPath);
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parentFolder = new File(getArguments().getString("current_path"));
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parentContents = listFiles(getBuilder().mMimeType);
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return new MaterialDialog.Builder(getActivity())
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.title(parentFolder.getAbsolutePath())
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.items(getContentsArray())
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.itemsCallback(this)
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.onNegative(new MaterialDialog.SingleButtonCallback() {
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@Override
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public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
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dialog.dismiss();
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}
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})
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.autoDismiss(false)
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.negativeText(getBuilder().mCancelButton)
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.build();
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}
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@Override
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public void onSelection(MaterialDialog materialDialog, View view, int i, CharSequence s) {
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if (canGoUp && i == 0) {
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parentFolder = parentFolder.getParentFile();
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canGoUp = parentFolder.getParent() != null;
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} else {
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parentFolder = parentContents[canGoUp ? i - 1 : i];
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canGoUp = true;
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}
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if (parentFolder.isFile()) {
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mCallback.onFileSelection(parentFolder);
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dismiss();
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} else {
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parentContents = listFiles(getBuilder().mMimeType);
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MaterialDialog dialog = (MaterialDialog) getDialog();
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dialog.setTitle(parentFolder.getAbsolutePath());
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getArguments().putString("current_path", parentFolder.getAbsolutePath());
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dialog.setItems(getContentsArray());
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}
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}
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@Override
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public void onAttach(Activity activity) {
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super.onAttach(activity);
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mCallback = (FileCallback) activity;
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}
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public void show(AppCompatActivity context) {
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Fragment frag = context.getSupportFragmentManager().findFragmentByTag(TAG);
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if (frag != null) {
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((DialogFragment) frag).dismiss();
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context.getSupportFragmentManager().beginTransaction()
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.remove(frag).commit();
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}
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show(context.getSupportFragmentManager(), TAG);
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}
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public static class Builder implements Serializable {
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@NonNull
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protected final transient AppCompatActivity mContext;
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@StringRes
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protected int mCancelButton;
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protected String mInitialPath;
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protected String mMimeType;
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public <ActivityType extends AppCompatActivity & FileCallback> Builder(@NonNull ActivityType context) {
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mContext = context;
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mCancelButton = android.R.string.cancel;
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mInitialPath = Environment.getExternalStorageDirectory().getAbsolutePath();
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mMimeType = null;
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}
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@NonNull
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public Builder cancelButton(@StringRes int text) {
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mCancelButton = text;
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return this;
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}
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@NonNull
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public Builder initialPath(@Nullable String initialPath) {
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if (initialPath == null)
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initialPath = File.separator;
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mInitialPath = initialPath;
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return this;
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}
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@NonNull
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public Builder mimeType(@Nullable String type) {
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mMimeType = type;
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return this;
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}
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@NonNull
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public FileChooserDialog build() {
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FileChooserDialog dialog = new FileChooserDialog();
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Bundle args = new Bundle();
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args.putSerializable("builder", this);
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dialog.setArguments(args);
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return dialog;
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}
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@NonNull
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public FileChooserDialog show() {
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FileChooserDialog dialog = build();
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dialog.show(mContext);
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return dialog;
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}
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}
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@SuppressWarnings("ConstantConditions")
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@NonNull
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private Builder getBuilder() {
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return (Builder) getArguments().getSerializable("builder");
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}
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private static class FileSorter implements Comparator<File> {
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@Override
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public int compare(File lhs, File rhs) {
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return lhs.getName().compareTo(rhs.getName());
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}
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}
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}

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