Differences

This shows you the differences between two versions of the page.

--- swdev:android:start [2018/05/04 06:10]
smayr [Explicit Intent]
+++ swdev:android:start [2018/05/22 14:15] (current)
smayr [Resources]
@@ Line 5: / Line 5: @@
     * [[https://developer.android.com/index.html|Android Development Resources]]
     * [[https://developer.android.com/studio/index.html|Android Studio (IDE)]]
+    * [[https://flutter.io/get-started/codelab/|Flutter (IDE)]]
     * [[https://www.visualstudio.com|Visual Studio (IDE) + Xamarin]] - Select //Community Edition//
@@ Line 172: / Line 173: @@
                 intentDataHandler.putExtra("Key2", "Value2");  // data payload (optional)
                 intentDataHandler.putExtra("com.acme.myapp.Key3", "Value3");  // use full path with key (recommended)
+                intentDataHandler.putExtra("Key4.TEAM_OBJ", aTeamObj); // parcelable object (eg. object of type Team)
                 startActivity(intentDataHandler);
                 break;
@@ Line 209: / Line 211: @@
             str = getIntent().getExtras().getString("Key3");
             Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
+        }
+        // Parcelable data
+        Team objTeam;
+        if (intent.hasExtra("Key4.TEAM_OBJ")) {
+            Log.d("MyApp", "Retrieving intent extras...");
+            objTeam = intent.getParcelableExtra("Key4.TEAM_OBJ");
+            Toast.makeText(this, "Team Name: "+ objTeam.name, Toast.LENGTH_SHORT).show();
         }
     }
@@ Line 214: / Line 224: @@
 </code>
+A parcelable extra must be of a type supporting parcelable.  For example:
+<code java>
+package com.acme.myapp;
+import android.os.Parcel;
+import android.os.Parcelable;
+public class Team implements Parcelable
+{
+    public long id = 0;
+    public String name = "";
+    public String number = "";
+    public int ranking = 0;
+    // Default constructor
+    Team()
+    {
+    }
+    // In constructor, read variables from Parcel.
+    // Important: Read them in the same sequence in which they were written in Parcel.
+    public Team(Parcel in) {
+        id = in.readLong();
+        name = in.readString();
+        number = in.readString();
+        ranking = in.readInt();
+    }
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+    // Write member variables in Parcel.
+    // Write in any order. Not required to write all members in Parcel.
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        // Write data in any order
+        dest.writeLong(id);
+        dest.writeString(name);
+        dest.writeString(number);
+        dest.writeInt(ranking);
+    }
+    // De-serialize the object
+    public static final Parcelable.Creator<Team> CREATOR = new Parcelable.Creator<Team>(){
+        public Team createFromParcel(Parcel in) {
+            return new Team(in);
+        }
+        public Team[] newArray(int size) {
+            return new Team[size];
+        }
+    };
+}
+</code>
 === Intent Examples ===
 For example, in the ''MainActivity'', you can define an intent: