Android #8: Working with Android Intents - Part 3

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

Explicit Intents example: This example demonstrates the inter-activity communication and will show on invoking user defined custom 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/btnId" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/invokeBtn" />
</LinearLayout>

layout/otherinvoked.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:id="@+id/otherMsgId" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/otherMsg" />
</LinearLayout>

BaseInvokingActivity.java

package in.satworks.android.samples.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class BaseInvokingActivity extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     // Invoke other activity
     Button invokeBtn=(Button)findViewById(R.id.btnId);
     invokeBtn.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View arg0) {
           Intent explicitIntent=new Intent(BaseInvokingActivity.this, OtherInvokedActivity.class);
           explicitIntent.putExtra("FromBaseInvokingActivity", "Value from FromBaseInvokingActivity");
           startActivity(explicitIntent);
      }
    });
}
}

OtherInvokedActivity.java

package in.satworks.android.samples.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class OtherInvokedActivity extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.otherinvoked);
 Intent intent=getIntent();
 Bundle extras=intent.getExtras();
 String val=(String)extras.get("FromBaseInvokingActivity");
 TextView txtView=(TextView)findViewById(R.id.otherMsgId);
 txtView.setText("OtherInvokedActivity: "+val);
}
}

values/strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>
<string name="app_name">ExplicitIntentsApp</string>
<string name="msg">BaseInvokingActivity!</string>
<string name="otherMsg">OtherInvokedActivity!</string>
<string name="invokeBtn">Invoke Other Activity</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=".BaseInvokingActivity" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:label="@string/app_name" android:name=".OtherInvokedActivity"></activity>
</application>
<uses-sdk android:minSdkVersion="8" />
</manifest>