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POCommunication between TabActivity and the embedded activity
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  1. POCommunication between TabActivity and the embedded activity
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    copied!<p>I am trying to figure out the best practice of communication between a TabActivity and the child activity embedded in this TabActivity.</p> <p>In my TabActivity, there is a button. When the button is clicked, I want the child activity embedded in this TabActivity to be updated. I wrote the code like below, and just wonder whether it is a good practice. Thanks.</p> <p>MyTabActivity.java</p> <pre><code>public class MyTabActivity extends TabActivity implements OnClickListener { private TabHost m_tabHost; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ff_tab_activity); LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); m_tabHost = getTabHost(); TabHost.TabSpec spec; Intent intent; intent = new Intent().setClass(this, ChildActivity.class); spec = m_tabHost.newTabSpec("Tab 1"); spec.setContent(intent); tabView = (TextView) inflater.inflate(R.layout.tab_indicator, null); spec.setIndicator(tabView); m_tabHost.addTab(spec); m_tabHost.setCurrentTab(0); ImageView nextButtonIv = (ImageView) findViewById(R.id.next_button); nextButtonIv.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.next_button: synchronized (ChildActivity.class) { if (null != ChildActivity.s_childActivity) { ChildActivity.s_childActivity.changeUI(); } } break; } } </code></pre> <p>ChildActivity.java</p> <pre><code>public class ChildActivity extends Activity { public static ChildActivity s_childActivity; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); synchronized (MatchupsActivity.class) { s_childActivity = this; } setContentView(R.layout.child_activity); } public void changeUi() { code that changes UI } protected void onDestroy() { super.onDestroy(); synchronized (MatchupsActivity.class) { s_childActivity = null; } } </code></pre>
 

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