Android #7: Working with Android Intents - Part 2

Refer the previous post to get background on Intents - http://satworks.blogspot.com/2010/12/android-6-working-with-android-intents.html

Implicit Intents example: Following example demonstrates the inter-activity communication and will show on invoking some of the built-in Android activities from one activity







layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:text="@string/msg" />
<Button android:id="@+id/btnDialId" android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:text="@string/btnDialTxt"
 android:gravity="right|center_vertical" />
<Button android:id="@+id/btnCallId" android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:text="@string/btnCallTxt"
 android:gravity="right|center_vertical" />
<Button android:id="@+id/btnSMSId" android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:text="@string/btnSMSTxt"
 android:gravity="right|center_vertical" />
<Button android:id="@+id/btnSearchId" android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:text="@string/btnSearchTxt"
 android:gravity="right|center_vertical" />
<Button android:id="@+id/btnBrowseId" android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:text="@string/btnBrowseTxt"
 android:gravity="right|center_vertical" />
<Button android:id="@+id/btnGoogleMapId" android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:text="@string/btnGoogleMapTxt"
 android:gravity="right|center_vertical" />
<Button android:id="@+id/btnViewContactsId"
 android:layout_width="fill_parent" android:layout_height="wrap_content"
 android:text="@string/btnViewContactsTxt" android:gravity="right|center_vertical" />
</LinearLayout>

ImplicitIntentsActivity.java

package in.satworks.android.samples.activity;

import android.app.Activity;
import android.app.SearchManager;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class ImplicitIntentsActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 // To Dial a number
 launchDialer();
 // To Call a Number
 // Requires android.permission.CALL_PHONE
 callNumber();
 // To SMS a Number
 launchSMS();
 // To perform local search
 performLocalSearch();
 // To open browser with URL
 launchBrowser();
 // To launch Google Maps
 showGoogleMap();
 // To View existing contacts stored in phone
 showContacts();
}

// To View existing contacts stored in phone
private void showContacts() {
 Button viewContacts = (Button) findViewById(R.id.btnViewContactsId);
 viewContacts.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   Intent contacts = new Intent();
   contacts.setAction(android.content.Intent.ACTION_VIEW);
   contacts.setData(ContactsContract.Contacts.CONTENT_URI);
   startActivity(contacts);
  }
 });

}

// To launch Google Maps
private void showGoogleMap() {
 Button googleMapBtn = (Button) findViewById(R.id.btnGoogleMapId);
 googleMapBtn.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   Intent intent = new Intent(Intent.ACTION_VIEW, Uri
     .parse("geo:13.05,80.20"));
   startActivity(intent);
  }
 });
}

// Open a browser window to the URL specified.
private void launchBrowser() {
 Button browseBtn = (Button) findViewById(R.id.btnBrowseId);
 browseBtn.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   Intent intent = new Intent(Intent.ACTION_VIEW, Uri
     .parse("http://www.android.com"));
   startActivity(intent);
  }
 });
}

// Perform local search
private void performLocalSearch() {
 Button searchBtn = (Button) findViewById(R.id.btnSearchId);
 searchBtn.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   Intent intent = new Intent(Intent.ACTION_SEARCH);
   intent.putExtra(SearchManager.QUERY, "Test");
   startActivity(intent);
  }
 });
}

// To launch SMS
private void launchSMS() {
 Button smsBtn = (Button) findViewById(R.id.btnSMSId);
 smsBtn.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   Intent intent = new Intent(Intent.ACTION_SENDTO, Uri
     .parse("sms:123456789"));
   intent.putExtra("sms_body", "Test SMS message.....");
   startActivity(intent);
  }
 });
}

// Calls the entered phone number.
private void callNumber() {
 Button callBtn = (Button) findViewById(R.id.btnCallId);
 callBtn.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   Intent intent = new Intent(Intent.ACTION_CALL, Uri
     .parse("tel:123456789"));
   startActivity(intent);
  }
 });
}

// Dials (but does not actually initiate the call) the number given
private void launchDialer() {
 Button dialBtn = (Button) findViewById(R.id.btnDialId);
 dialBtn.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   Intent intent = new Intent(Intent.ACTION_DIAL, Uri
     .parse("tel:123456789"));
   startActivity(intent);
  }
 });
}
}

values/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <string name="app_name">ImplicitIntentsApp</string>
   <string name="msg">ImplicitIntentsActivity! \nTry out few of the predefined intents\n</string>
   <string name="btnDialTxt">Launch Dialer</string>
   <string name="btnCallTxt">Launch Call</string>
   <string name="btnSMSTxt">Launch SMS</string>
   <string name="btnSearchTxt">Launch Search</string>
   <string name="btnBrowseTxt">Launch Browser</string>
   <string name="btnGoogleMapTxt">Launch Google Map</string>
   <string name="btnViewContactsTxt">Launch Phone Contacts</string>
</resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="in.satworks.android.samples.activity" android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
 <activity android:name=".ImplicitIntentsActivity"
  android:label="@string/app_name">
  <intent-filter>
   <action android:name="android.intent.action.MAIN" />
   <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
  <intent-filter>
   <action android:name="android.intent.action.VIEW" />
   <category android:name="android.intent.category.DEFAULT" />
  </intent-filter>
 </activity>
</application>
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.CALL_PHONE"/>
</manifest>