Tuesday, 14 June 2011

First Steps - Passing values to an Activity

How do I pass a value to an activity?

To start an Activity you use an Intent. In this intent you can pass data which is returned as a Bundle object.

Android Activities and Intents

Below is some simple example code for creating a new intent to launch an Activity named MyActivity. Note the call to the putExtra method which accepts a key name ("content") and a value:

Intent myIntent = new Intent();
String packageName = this.getPackageName();
packageName + "." + MyActivity.class.getSimpleName());
myIntent.putExtra("content", "my content string");

Here is the code for the called activity with the Bundle data extracted from the intent. You can then retrieve the passed extra content from the bundle object:

public class MyActivity extends Activity {

  public void onCreate(Bundle savedInstanceState) {

    Bundle bundle = getIntent().getExtras();
    String content = bundle.getString("content");

All pretty simple when you know how.


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