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我有一个Android活动启动一个子活动，它在Surfaceview上运行Sygic导航。停止子活动返回到父活动
启动儿童活动效果很好，导航启动。但是，当他们退出Sygic应用程序时，我想关闭子活动并返回到显示父活动。正如你所看到的，在Finish（）方法中，我尝试调用this.finish（）;和getParent（）。finish（）;但是都没有工作。它所做的只是显示一个黑色屏幕，我猜是表面视图。任何想法如何让它成功地关闭孩子活动并再次显示父母活动？
这里是启动子活性代码：
NavigationActivity.SygicModule = this;
Log("Creating intent for navigation activity");
Intent intent = new Intent(getActivity(), NavigationActivity.class);
Log("Starting navigation activity");
getActivity().startActivity(intent);
这里是为孩子导航活动视图中的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"
android:id="@+id/layout">
<SurfaceView android:id="@+id/surfaceView" android:layout_height="match_parent" android:layout_width="match_parent"></SurfaceView>
</LinearLayout>
这里是为孩子导航活动的代码：
package ti.sygic;
public class NavigationActivity extends SygicDriveActivity {
private static final String LCAT = "SygicModule";
private static SError error = new SError();
private static Activity currentActivity = null;
public static SygicModule SygicModule;
private Handler mHandler = new Handler();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
currentActivity = this;
super.onCreate(savedInstanceState);
try {
setContentView(TiRHelper.getApplicationResource("layout.sygicmain"));
final ApiCallback apicallback = new ApiCallback() {
public void onRunDrive() {
try {
final SurfaceView surface = (SurfaceView) findViewById(TiRHelper.getApplicationResource("id.surfaceView"));
mHandler.post(new Runnable() {
public void run() {
runDrive(surface, getPackageName()); // starts the drive app
}
});
} catch (ResourceNotFoundException e) {
// TODO Auto-generated catch block
Log("Failed to find id.surfaceView!");
e.printStackTrace();
} // surface
}
public void onInitApi() // gets called after runDrive();
{
// code to make sure that gps is enabled before initializing
Log("Checking that gps is enabled");
String provider = "com.android.settings.widget.SettingsAppWidgetProvider";
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.NO_REQUIREMENT);
criteria.setPowerRequirement(Criteria.NO_REQUIREMENT);
criteria.setCostAllowed(false);
ContentResolver contentResolver = getContentResolver();
if (!Settings.Secure.isLocationProviderEnabled(contentResolver, LocationManager.GPS_PROVIDER)) {
Log("Gps is not enabled, showing gps settings");
final Intent poke = new Intent();
poke.setClassName("com.android.settings", provider);
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
int status = ApplicationAPI.InitApi(getPackageName(), true, msgHandler); // api initialization
Log("Status = " + Integer.toString(status));
if (status != 1) {
Log("InitApi failed! " + status);
}
else {
//start checking every second if application is running. if it isn't then finish this and parent activities.
//note: we wouldn't have to do this if APP_EXIT event actually fired. :(
CheckIfRunning();
}
}
};
ApplicationAPI.startDrive(apicallback);
} catch (ResourceNotFoundException e1) {
Log("Failed to find resource!");
e1.printStackTrace();
}
}
public static void navigateTo(Float latitude, Float longitude) {
try
{
Log("navigateTo: " + latitude + "/" + longitude);
Integer lat = (int)(latitude * 100000);
Integer lon = (int)(longitude * 100000);
//start navigation.
Log("Starting navigation for " + lat + "/" + lon);
SWayPoint wayPoint = new SWayPoint();
wayPoint.SetLocation(lat, lon);
ApplicationAPI.StartNavigation(error, wayPoint, 0, true, true, 0);//NavigationParams.NpMessageAvoidTollRoadsUnable
Log("Start navigation result: " + error.nCode + " " + error.GetDescription());
//if waiting for gps, call in a bit.
if(error.nCode == -6)
{
Thread.sleep(5000);
navigateTo(latitude, longitude);
}
}
catch(Exception exc)
{
Log(exc.getMessage());
}
}
final ApplicationHandler msgHandler = new ApplicationHandler() {
@Override
public void onApplicationEvent(int nEvent, String strData) {
Log("Event No. " + Integer.toString(nEvent) + " detected."); // event handling
switch (nEvent) {
case ApplicationEvents.EVENT_APP_EXIT:
Log("In EVENT_APP_EXIT event");
Finish();
break;
case ApplicationEvents.EVENT_WAIPOINT_VISITED:
Log("Waypoint visited.");
break;
case ApplicationEvents.EVENT_ROUTE_COMPUTED:
Log("Route computed.");
break;
case ApplicationEvents.EVENT_ROUTE_FINISH:
Log("Route finished.");
break;
case ApplicationEvents.EVENT_POI_WARNING:
Log("Poi warning!.");
break;
case ApplicationEvents.EVENT_CHANGE_LANGUAGE:
Log("Language changed.");
break;
case ApplicationEvents.EVENT_EXIT_MENU:
Log("Menu exited.");
break;
case ApplicationEvents.EVENT_MAIN_MENU:
Log("Entering main menu.");
break;
case ApplicationEvents.EVENT_BORDER_CROSSING:
Log("Crossing border.");
}
}
};
private void CheckIfRunning()
{
new Thread(new Runnable() {
@Override
public void run() {
try
{
int numTimesNotRunning = 0;
while(true)
{
boolean isRunning = ApplicationAPI.IsApplicationRunning(error, 0) == 1;
if(isRunning)
{
Log("App is running, will check again in 2 seconds");
numTimesNotRunning = 0;
Thread.sleep(2000);
}
else {
if(numTimesNotRunning < 3)
{
numTimesNotRunning++;
Log("App not running, num times " + numTimesNotRunning);
Thread.sleep(2000);
}
else
break;
}
}
Log("App is not running, calling sygicmodule finish!");
Finish();
}
catch(Exception exc)
{
Log(exc.getMessage());
}
}
}).start();
}
private void Finish()
{
Log("In NavigationActivity Finish");
runOnUiThread(new Runnable() {
public void run() {
try
{
//launch parent activity.
Log("Starting parent activity");
Intent intent = new Intent(currentActivity, SygicModule.getActivity().getClass());
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
currentActivity.startActivity(intent);
//finish current activity.
Log("Finishing activity");
//setContentView(null);
currentActivity.finish();
}
catch(Exception exc)
{
Log(exc.getMessage());
}
}
});
}
private static void Log(String message) {
//org.appcelerator.kroll.common.Log.i(LCAT, message);
if(message != null && message.length() > 0)
android.util.Log.i(LCAT, message);
}
}
后，你为什么不尝试启动父活动从您的活动应该关闭的时刻导航活动何时结束？ Intent intent = new Intent（getActivity（），ParentActivity.class）; – R4j 2012-02-09 18:11:47
父活动已经在儿童活动下面运行，如果我开始在顶部，那么它会运行两次，这似乎不是一个好主意...... – Justin 2012-02-09 18:31:27
@Justin您可以在启动意图时传入FLAG_ACTIVITY_CLEAR_TOP获取当前正在运行的Activity并将其带到堆栈的前面。更多关于如何在这里工作的细节：http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TOP – onit 2012-02-09 18:57:45