08.1. Android How to Use Intent (explicit)
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This document discusses intents in Android. It explains that intents are used to invoke activities both internally and externally. An intent can be used to explicitly start a new activity by creating an intent, putting extras like key-value pairs, and calling startActivity. This is demonstrated with code examples of two activities - Activity01 starts Activity02 by creating an intent and passing an ID extra, which Activity02 retrieves using getIntent().getExtras().
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08.1. Android How to Use Intent (explicit)
- 1. 08. Intent (Explicit) Oum Saokosal Master of Engineering in Information Systems, South Korea 855-12-252-752 [email protected]
- 2. Agenda • What is Intent? • Intent: Invoke another Activity explicitly • Put Extra with Intent
- 3. What is Intent? (1) • There are many uses of intent. – You can use intents to invoke other applications from your application. – You can use intents to invoke internal or external components from your application. – You can use intents to raise events so that others can respond in a manner similar to a publish-and subscribe model.
- 4. What is Intent? (2) • At the simplest level, an intent is an action that you can tell Android to invoke. That is, you can invoke activity 02 from activity 01. • In order to invoke like that, you need to register those activities in AndroidManifest.xml. • See Example: IntentExplicit.
- 5. Intent: Invoke another Activity explicitly
- 6. public class Activity01 extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main01); } public void gotoProfile(View v){ Intent in = new Intent(this, Activity02.class); startActivity(in); } }
- 7. main01.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Name: Oum Saokosal" /> …… …… …… <Button android:onClick="gotoProfile" android:id="@+id/btnProfile" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Profile" /> </LinearLayout>
- 8. public class Activity02 extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main02); } public void backtoMain(View v){ Intent in = new Intent(this, Activity01.class); startActivity(in); } }
- 9. main02.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Relationship: Engaged" android:textAppearance="?android:attr/textAppearanceMedium" /> …… …… <Button android:onClick="backtoMain" android:id="@+id/btnBack" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Back"/> </LinearLayout>
- 10. AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.kosalab" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/ic_launcher" android:label="Intent Explicit" > <activity android:label="Activity01" android:name=".Activity01" > <intent-filter > <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:label="Activity02" android:name=".Activity02"></activity> </application> </manifest>
- 11. Put Extra with Intent • In PHP, you can send data from a file to another file through session. • Similar to that, you can send data from one Activity to other one by putting extra with Intent. • The extra data is in the form of key/value pairs.
- 12. putExtra() into Intent public class Activity01 extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main01); } public void gotoProfile(View v){ Intent in = new Intent(this, Activity02.class); in.putExtra("id", "4312"); startActivity(in); } }
- 13. getExtras() from getIntent public class Activity02 extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main02); Bundle extras = getIntent().getExtras(); if (extras != null) { int id = 0; if(extras.getString("id") != null){ id = Integer.parseInt(extras.getString("id")); Toast.makeText(this, "your id = " + id, Toast.LENGTH_LONG).show(); } } } public void backtoMain(View v){ Intent in = new Intent(this, Activity01.class); startActivity(in); } }
- 15. Go on to the next slide