working backup and restore of configuration settings

[mobile-ledger.git] / app / src / main / java / net / ktnx / mobileledger / BackupsActivity.java

diff --git a/app/src/main/java/net/ktnx/mobileledger/BackupsActivity.java b/app/src/main/java/net/ktnx/mobileledger/BackupsActivity.java
new file mode 100644 (file)
index 0000000..9a1f706
--- /dev/null
+++ b/app/src/main/java/net/ktnx/mobileledger/BackupsActivity.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright © 2021 Damyan Ivanov.
+ * This file is part of MoLe.
+ * MoLe is free software: you can distribute it and/or modify it
+ * under the term of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your opinion), any later version.
+ *
+ * MoLe is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License terms for details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.ktnx.mobileledger;
+
+import android.net.Uri;
+import android.os.Bundle;
+import android.view.MenuItem;
+import android.view.View;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.google.android.material.snackbar.BaseTransientBottomBar;
+import com.google.android.material.snackbar.Snackbar;
+
+import net.ktnx.mobileledger.async.ConfigReader;
+import net.ktnx.mobileledger.async.ConfigWriter;
+import net.ktnx.mobileledger.databinding.FragmentBackupsBinding;
+
+import java.io.IOException;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+public class BackupsActivity extends AppCompatActivity {
+    private FragmentBackupsBinding b;
+    private ActivityResultLauncher<String> backupChooserLauncher;
+    private ActivityResultLauncher<String[]> restoreChooserLauncher;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        b = FragmentBackupsBinding.inflate(getLayoutInflater());
+        setContentView(b.getRoot());
+
+        setSupportActionBar(b.toolbar);
+        // Show the Up button in the action bar.
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar != null) {
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
+
+        b.backupButton.setOnClickListener(this::backupClicked);
+        b.restoreButton.setOnClickListener(this::restoreClicked);
+
+
+        backupChooserLauncher =
+                registerForActivityResult(new ActivityResultContracts.CreateDocument(),
+                        this::storeConfig);
+        restoreChooserLauncher =
+                registerForActivityResult(new ActivityResultContracts.OpenDocument(),
+                        this::readConfig);
+    }
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        if (item.getItemId() == android.R.id.home) {
+            finish();
+
+            return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+    private void storeConfig(Uri result) {
+        if (result == null)
+            return;
+
+        try {
+            ConfigWriter saver =
+                    new ConfigWriter(getBaseContext(), result, new ConfigWriter.OnErrorListener() {
+                        @Override
+                        public void error(Exception e) {
+                            Snackbar.make(b.backupButton, e.toString(),
+                                    BaseTransientBottomBar.LENGTH_LONG)
+                                    .show();
+                        }
+                    }, new ConfigWriter.OnDoneListener() {
+                        public void done() {
+                            Snackbar.make(b.backupButton, R.string.config_saved,
+                                    Snackbar.LENGTH_LONG)
+                                    .show();
+                        }
+                    });
+            saver.start();
+        }
+        catch (IOException e) {
+            e.printStackTrace();
+        }
+
+    }
+    private void readConfig(Uri result) {
+        if (result == null)
+            return;
+
+        try {
+            ConfigReader reader =
+                    new ConfigReader(getBaseContext(), result, new ConfigWriter.OnErrorListener() {
+                        @Override
+                        public void error(Exception e) {
+                            Snackbar.make(b.backupButton, e.toString(),
+                                    BaseTransientBottomBar.LENGTH_LONG)
+                                    .show();
+                        }
+                    }, new ConfigReader.OnDoneListener() {
+                        public void done() {
+                            Snackbar.make(b.backupButton, R.string.config_restored,
+                                    Snackbar.LENGTH_LONG)
+                                    .show();
+                        }
+                    });
+            reader.start();
+        }
+        catch (IOException e) {
+            e.printStackTrace();
+        }
+
+    }
+    private void backupClicked(View view) {
+        final Date now = new Date();
+        DateFormat df = new SimpleDateFormat("y-MM-dd HH:mm", Locale.getDefault());
+        df.format(now);
+        backupChooserLauncher.launch(String.format("MoLe-%s.json", df.format(now)));
+    }
+    private void restoreClicked(View view) {
+        restoreChooserLauncher.launch(new String[]{"application/json"});
+    }
+
+}
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