com.darizotas.metadatastrip.FileListActivity.java Source code

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Here is the source code for com.darizotas.metadatastrip.FileListActivity.java

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/*
 * Copyright 2014 Dario B darizotas at gmail dot com
 *
 *    This software is licensed under a new BSD License.
 *    Unported License. http://opensource.org/licenses/BSD-3-Clause
 *
 */
package com.darizotas.metadatastrip;

import java.io.File;

import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;

/**
 * An activity representing a list of Files. This activity has different
 * presentations for handset and tablet-size devices. On handsets, the activity
 * presents a list of items, which when touched, lead to a
 * {@link FileDetailActivity} representing item details. On tablets, the
 * activity presents the list of items and item details side-by-side using two
 * vertical panes.
 * <p>
 * The activity makes heavy use of fragments. The list of items is a
 * {@link FileListFragment} and the item details (if present) is a
 * {@link FileDetailFragment}.
 * <p>
 * This activity also implements the required {@link FileListFragment.Callbacks}
 * interface to listen for item selections.
 */
public class FileListActivity extends FragmentActivity implements FileListFragment.Callbacks {

    /**
     * Whether or not the activity is in two-pane mode, i.e. running on a tablet
     * device.
     */
    private boolean mTwoPane;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_file_list);

        if (findViewById(R.id.file_detail_container) != null) {
            // The detail container view will be present only in the
            // large-screen layouts (res/values-large and
            // res/values-sw600dp). If this view is present, then the
            // activity should be in two-pane mode.
            mTwoPane = true;

            // In two-pane mode, list items should be given the
            // 'activated' state when touched.
            ((FileListFragment) getSupportFragmentManager().findFragmentById(R.id.file_list))
                    .setActivateOnItemClick(true);
        }

        // TODO: If exposing deep links into your app, handle intents here.
    }

    /**
     * Callback method from {@link FileListFragment.Callbacks} indicating that
     * the item with the given PATH was selected.
     */
    @Override
    public void onItemSelected(String path) {
        File file = new File(path);
        if (file.canRead()) {
            if (file.isDirectory()) {
                FragmentManager manager = getSupportFragmentManager();

                if (mTwoPane) {
                    // Removes the previous detail fragment
                    Fragment fragment = manager.findFragmentById(R.id.file_detail_container);
                    if (fragment != null) {
                        manager.beginTransaction().remove(fragment).commit();
                        //http://stackoverflow.com/questions/7246479/android-fragmenttransaction-commit-when
                        manager.executePendingTransactions();
                    }
                }
                // Updates the list.
                ((FileListFragment) manager.findFragmentById(R.id.file_list)).updateListAdapter(file.getPath());

            } else {
                showDetails(path);
            }
            // The folder cannot be read.
        } else {
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setIcon(R.drawable.ic_launcher)
                    .setTitle("[" + file.getName() + "] " + getResources().getText(R.string.error_open_file))
                    .setPositiveButton("OK", null).show();
        }
    }

    /**
     * Shows the {@link FileDetailFragment file metadata details fragment} of the given file.
     * @param path Path to file.
     */
    private void showDetails(String path) {
        if (mTwoPane) {
            // In two-pane mode, show the detail view in this activity by
            // adding or replacing the detail fragment using a
            // fragment transaction.
            Bundle arguments = new Bundle();
            arguments.putString(FileDetailFragment.ARG_ITEM_ID, path);
            FileDetailFragment fragment = new FileDetailFragment();
            fragment.setArguments(arguments);
            getSupportFragmentManager().beginTransaction().replace(R.id.file_detail_container, fragment).commit();

        } else {
            // In single-pane mode, simply start the detail activity
            // for the selected item ID.
            Intent detailIntent = new Intent(this, FileDetailActivity.class);
            detailIntent.putExtra(FileDetailFragment.ARG_ITEM_ID, path);
            startActivity(detailIntent);
        }
    }
}