Try using the following:
Intent startMain = new Intent(Intent.ACTION_MAIN);
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startMain);
If a default action is already set (yours), you can call first:
getPackageManager().clearPackagePreferredActivities(getPackageName());
If the default action is not yours, you cannot clear it programmatically, what you can do is to check if other app is set as default and show a message..
private boolean isMyLauncherDefault() {
PackageManager localPackageManager = getPackageManager();
Intent intent = new Intent("android.intent.action.MAIN");
intent.addCategory("android.intent.category.HOME");
String str = localPackageManager.resolveActivity(intent,
PackageManager.MATCH_DEFAULT_ONLY).activityInfo.packageName;
return str.equals(getPackageName());
}
As a workaround in case of other app is set as default, you can created a fake
home, install it (this will force the system to clear the default app) and then uninstall it...
Manifest.xml
<activity
android:name="FakeHome" android:enabled="false">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
FakeHome.java
public class FakeHome extends Activity {
}
Somewhere
if (!isMyLauncherDefault()) {
PackageManager p = getPackageManager();
ComponentName cN = new ComponentName(getApplicationContext(), FakeHome.class);
p.setComponentEnabledSetting(cN, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
Intent selector = new Intent(Intent.ACTION_MAIN);
selector.addCategory(Intent.CATEGORY_HOME);
startActivity(selector);
p.setComponentEnabledSetting(cN, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
}
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