(clean) keep it simple , don't polluted ComposeActivity, commented and moving the code

app/src/main/java/com/keylesspalace/tusky/db/AppDatabase.java

@@ -4,7 +4,7 @@ import android.arch.persistence.room.Database;
 import android.arch.persistence.room.RoomDatabase;
 
 /**
- * Created by cto3543 on 28/06/2017.
+ * DB version & declare DAO
  */
 
 @Database(entities = {TootEntity.class}, version = 2, exportSchema = false)

app/src/main/java/com/keylesspalace/tusky/db/MediaEntity.java

@@ -2,17 +2,46 @@ package com.keylesspalace.tusky.db;
 
 import android.arch.persistence.room.ColumnInfo;
 import android.arch.persistence.room.Entity;
+import android.arch.persistence.room.ForeignKey;
 import android.arch.persistence.room.PrimaryKey;
 
 /**
- * Created by cto3543 on 28/06/2017.
+ * Media model
  */
 
-@Entity
+@Entity(foreignKeys = @ForeignKey(entity = TootEntity.class,
+        parentColumns = "uid",
+        childColumns = "toot_id"))
 public class MediaEntity {
-    @PrimaryKey
+    @ColumnInfo(name = "toot_id")
+    private int toot_id;
+    @PrimaryKey(autoGenerate = true)
     private int uid;
-
     @ColumnInfo(name = "url")
-    private String text;
+    private String url;
+
+    // getter setter
+    public int getToot_id() {
+        return toot_id;
+    }
+
+    public void setToot_id(int toot_id) {
+        this.toot_id = toot_id;
+    }
+
+    public int getUid() {
+        return uid;
+    }
+
+    public void setUid(int uid) {
+        this.uid = uid;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
 }

app/src/main/java/com/keylesspalace/tusky/db/TootAction.java

@@ -0,0 +1,51 @@
+package com.keylesspalace.tusky.db;
+
+import android.os.AsyncTask;
+import android.text.TextUtils;
+import android.util.Log;
+
+import com.keylesspalace.tusky.TuskyApplication;
+
+import java.util.List;
+
+/**
+ * Created by cto3543 on 29/06/2017.
+ *
+ */
+
+public class TootAction {
+
+    private static TootDao tootDao = TuskyApplication.getDB().tootDao();
+
+    public static void getAllToot() {
+        new AsyncTask<Void, Void, List<TootEntity>>() {
+            @Override
+            protected List<TootEntity> doInBackground(Void... params) {
+                return tootDao.loadAll();
+            }
+
+            @Override
+            protected void onPostExecute(List<TootEntity> tootEntities) {
+                super.onPostExecute(tootEntities);
+                for (TootEntity t : tootEntities) {
+                    Log.e("toot", "id=" + t.getUid() + "text=" + t.getText());
+                }
+            }
+        }.execute();
+    }
+
+    public static void saveTheToot(String s) {
+        if (!TextUtils.isEmpty(s)) {
+            final TootEntity toot = new TootEntity();
+            toot.setText(s);
+            new AsyncTask<Void, Void, Void>() {
+                @Override
+                protected Void doInBackground(Void... params) {
+                    tootDao.insert(toot);
+                    return null;
+                }
+            }.execute();
+        }
+    }
+
+}

app/src/main/java/com/keylesspalace/tusky/db/TootEntity.java

@@ -5,7 +5,7 @@ import android.arch.persistence.room.Entity;
 import android.arch.persistence.room.PrimaryKey;
 
 /**
- * Created by cto3543 on 28/06/2017.
+ * toot model
  */
 
 @Entity
@@ -16,7 +16,7 @@ public class TootEntity {
     @ColumnInfo(name = "text")
     private String text;
 
-    // set get
+    // getter setter
     public String getText() {
         return text;
     }