(); long time = System.currentTimeMillis()-start;我想要显示一个圆形progressBar,并在显示所有片段时将其设置为不存在,但Activity更深层次的理论问题:
如果我覆盖Activity.onCreateView()并使用System.currentTimeMillis(),我看到在我的Nexus4上显示50个片段需要7.5秒( 350个片段需要
android.content.Intent.EXTRA_SUBJECT, "Feedback from customers");
/* Send it off to the Activity-Chooser06:17.074: E/AndroidRuntime(8153): java.lang.IllegalStateException: Could not execute method of the activity(8153): Caused by: android.util.Andr
EXCEPTION: mainjava.lang.RuntimeException: Unable to start activityreference at android.app.Activity.performCreate(Activity.java:6056)
at android.app.Inst
我的问题是,我们可以通过意图或使用任何其他方式从android activity调用原生activity吗?如果是,是如何实现的?//...rest of the xml including my main java activity here
<activity android:name="android.app.NativeActivity<meta-data android:name="android.app.mynativeactivity"
然而,每当我在AVD上运行它时,它都会在LogCat中返回一个错误,说明我的代码中有一个NullPointerException,因此它“无法实例化activity ComponentInfo”。下面是我的代码:import android.os.Bundle; import android.view.Menu;
public class MainA
当按钮被点击时,我想做以下工作:
check if there is an existing type of the target Activity in the activity back-stackor not, if there is, bring that Activity to the top and if not create new Intent and then go to thatActivity.