Android Open Source - WineDB File Database Backup

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License

The source code is released under:

MIT License

Java Source Code

package com.selesse.android.winedb.database;
//from w w  w.  j a v  a2  s. c  o m
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Environment;
import android.text.InputType;
import android.widget.EditText;
import android.widget.Toast;
import com.selesse.android.winedb.R;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

/**
 * Class used to import and export file backups of wine databases. Closely linked to {@link WineDatabaseHandler}.
 */
public class FileDatabaseBackup {
    private Context context;
    private final String defaultBackupName = "winedb.bak";

    public FileDatabaseBackup(Context context) {
        this.context = context;
    }

    public void startExportDatabase() {
        AlertDialog.Builder alert = new AlertDialog.Builder(context);
        alert.setTitle(R.string.export_dialog_title);
        alert.setMessage(R.string.export_dialog_message);

        // Set an EditText view to get user input, disable auto correct on it
        final EditText input = new EditText(context);
        input.setText(Environment.getExternalStorageDirectory().getPath() + "/" + defaultBackupName);
        input.setInputType(~(InputType.TYPE_TEXT_FLAG_AUTO_CORRECT));
        alert.setView(input);

        if (!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
            showErrorToast(context.getString(R.string.sd_card_not_mounted));
        }

        if (!Environment.getExternalStorageDirectory().canWrite()) {
            showErrorToast(context.getString(R.string.export_dialog_no_write));
            return;
        }

        alert.setPositiveButton(R.string.export, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int whichButton) {
                String value = input.getText().toString();
                final File exportLocation = new File(value);
                if (exportLocation.exists()) {
                    createConfirmExportDialog(exportLocation);
                } else {
                    exportWineDatabase(exportLocation);
                }
            }
        }).setNegativeButton(R.string.cancel, null);

        alert.show();
    }

    private void createConfirmExportDialog(final File exportLocation) {
        AlertDialog.Builder confirm = new AlertDialog.Builder(context);
        DialogInterface.OnClickListener dialogListener = new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (which == DialogInterface.BUTTON_POSITIVE) {
                    exportWineDatabase(exportLocation);
                }
            }
        };
        confirm.setTitle(R.string.confirm);
        confirm.setMessage(R.string.export_overwrite_file);

        confirm.setPositiveButton(R.string.yes, dialogListener).setNegativeButton(R.string.no, dialogListener).show();
    }

    private void exportWineDatabase(File exportLocation) {
        try {
            WineDatabaseHandler handler = WineDatabaseHandler.getInstance(context);
            handler.exportDatabase(exportLocation.getPath());
            Toast.makeText(context, R.string.export_success, Toast.LENGTH_SHORT).show();
        } catch (FileNotFoundException e) {
            showErrorToast(context.getString(R.string.export_dialog_no_database));
        } catch (IOException e) {
            showErrorToast(context.getString(R.string.export_error));
        }
    }

    public void startImportDatabase() {
        AlertDialog.Builder alert = new AlertDialog.Builder(context);
        alert.setTitle(R.string.import_dialog_title);
        alert.setMessage(R.string.import_dialog_message);

        // Set an EditText view to get user input
        final EditText input = new EditText(context);
        input.setText(Environment.getExternalStorageDirectory().getPath() + "/" + defaultBackupName);
        input.setInputType(~(InputType.TYPE_TEXT_FLAG_AUTO_CORRECT));
        alert.setView(input);

        alert.setPositiveButton(R.string.imports, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int whichButton) {
                String value = input.getText().toString();
                File importLocation = new File(value);
                if (importLocation.exists()) {
                    importWineDatabase(importLocation);
                } else {
                    showErrorToast(context.getString(R.string.import_file_not_found));
                }
            }
        }).setNegativeButton(R.string.cancel, null);

        alert.show();
    }

    private void importWineDatabase(File importLocation) {
        try {
            WineDatabaseHandler handler = WineDatabaseHandler.getInstance(context);
            handler.importDatabase(importLocation.getPath());
            handler.refresh();
        } catch (FileNotFoundException e) {
            showErrorToast(context.getString(R.string.import_error));
        } catch (IOException e) {
            showErrorToast(context.getString(R.string.import_error));
        }
    }

    private void showErrorToast(String errorString) {
        Toast.makeText(context, errorString, Toast.LENGTH_LONG).show();
    }
}

Java Source Code List

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