Export DB to external storage

ujjwalmaity · Jan 15, 2020 · abcb2d9 · abcb2d9
1 parent e342602
commit abcb2d9
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diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
@@ -2,6 +2,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="dev.ujjwal.sqlitedatastorage">
 
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

diff --git a/app/src/main/java/dev/ujjwal/sqlitedatastorage/MainActivity.java b/app/src/main/java/dev/ujjwal/sqlitedatastorage/MainActivity.java
@@ -5,13 +5,20 @@
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.Environment;
 import android.view.View;
 import android.widget.Toast;
 import android.widget.EditText;
 import android.database.Cursor;
 import android.content.ContentValues;
 import android.database.sqlite.SQLiteDatabase;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+
 import dev.ujjwal.sqlitedatastorage.data.StudentDbHelper;
 import dev.ujjwal.sqlitedatastorage.data.StudentContract.StudentEntry;
 
@@ -152,13 +159,41 @@ public void onClick(View v) {
             }
         });
 
+        //MAKE ATTENDANCE
         findViewById(R.id.attendance).setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent intent = new Intent(MainActivity.this, AttendanceActivity.class);
                 startActivity(intent);
             }
         });
+
+        //EXPORT DB TO EXTERNAL STORAGE
+        findViewById(R.id.export).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                File data = Environment.getDataDirectory();
+//                File sd = Environment.getExternalStorageDirectory();
+                File sd = getExternalFilesDir("student_attendance");
+                String currentDBPath = "/data/" + getPackageName() + "/databases/" + "studentAttendance.db";
+                String backupDBPath = "studentAttendance.db";
+                File currentDB = new File(data, currentDBPath);
+                File backupDB = new File(sd, backupDBPath);
+                FileChannel source = null;
+                FileChannel destination = null;
+                try {
+                    source = new FileInputStream(currentDB).getChannel();
+                    destination = new FileOutputStream(backupDB).getChannel();
+                    destination.transferFrom(source, 0, source.size());
+                    source.close();
+                    destination.close();
+                    Toast.makeText(getApplicationContext(), "DB Exported!", Toast.LENGTH_LONG).show();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                    Toast.makeText(getApplicationContext(), "DB Not Export!", Toast.LENGTH_LONG).show();
+                }
+            }
+        });
     }
 
     public void showMessage(String title, String Message) {

diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
@@ -106,4 +106,13 @@
         android:layout_centerHorizontal="true"
         android:text="ATTENDANCE"
         android:textColor="@color/colorButton" />
+
+    <Button
+        android:id="@+id/export"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_below="@id/attendance"
+        android:layout_centerHorizontal="true"
+        android:text="EXPORT"
+        android:textColor="@color/colorButton" />
 </RelativeLayout>