package my.packagename; import android.app.Activity; import android.app.AlertDialog; import android.os.Bundle; import android.os.Handler; public class ContextExampleActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Handler handler = new Handler(); handler.postDelayed(new TestHandler(), 1000); } class TestHandler implements Runnable { /* (non-Javadoc) * @see java.lang.Runnable#run() */ @Override public void run() { AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext()); builder.setMessage("hoge"); builder.show(); } } }