Question

我正在创建一个销售系统的应用程序。在结帐页面（PaymentScreen活动）上，将执行检查以确保客户已登录其帐户，如果不是，则会在继续结帐前将其重定向以登录。

当我检查客户是否已登录时，代码会正确验证客户是否未登录，然后执行该功能（我可以从LogCat告知），但活动从未启动且代码继续执行。

任何帮助都会受到赞赏 - 我似乎无法想出这一点。

PaymentScreen.java：

public class PaymentScreen extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {   
    super.onCreate(savedInstanceState);
    setContentView(R.layout.paymentscreen);

    if(Singleton.getInstance().selected_city == null) {
        PaymentScreen.this.startActivity(new Intent().setClass(PaymentScreen.this, CityList.class));
    }
    if(Singleton.getInstance().selected_venue == null) {
        PaymentScreen.this.startActivity(new Intent().setClass(PaymentScreen.this, VenueList.class));
    }
    if(Singleton.getInstance().selected_event == null) {
        PaymentScreen.this.startActivity(new Intent().setClass(PaymentScreen.this, EventList.class));
    }
    if(Singleton.getInstance().customer == null) {
        PaymentScreen.this.startActivity(new Intent().setClass(PaymentScreen.this, LoginScreen.class).putExtra("sendToActivity", "PaymentScreen"));
        Log.d("LineBouncer", "in if statement and (customer == null) is true");
    }
    if(Singleton.getInstance().customer == null) {
        Log.d("LineBouncer", "customer is null");
    }
    new GetPrepurchaseId().execute();
}
}

logcat的：

06-19 02:10:22.972: D/LineBouncer(3102): in if statement and (customer == null) is true
06-19 02:10:22.972: D/LineBouncer(3102): customer is null

的AndroidManifest.xml：

    <activity android:name=".CityList" android:label="@string/app_name"></activity>
    <activity android:name=".LoginScreen" android:label="@string/app_name"></activity> 
    <activity android:name=".CreateAccount" android:label="@string/app_name"></activity> 
    <activity android:name=".VenueList" android:label="@string/app_name"></activity> 
    <activity android:name=".EventList" android:label="@string/app_name"></activity>
    <activity android:name=".EventDetails" android:label="@string/app_name"></activity>
    <activity android:name=".PaymentScreen" android:label="@string/app_name"></activity>
    <activity android:name=".OrderHistory" android:label="@string/app_name"></activity>
    <activity android:name=".PassView" android:label="@string/app_name"></activity>

从LogCat可以清楚地看出，该程序识别出客户为空且运行在StartActivity代码上，但随后继续运行并且从未实际启动该活动。

谢谢！

Answer 1

开始活动的正确方法如下：

Intent intent = new Intent(PaymentScreen.this, EventList.class);
startActivity(intent);

Answer 2

而不是PaymentScreen.this.startActivity(new Intent().setClass(PaymentScreen.this, CityList.class));

尝试：

PaymentScreen.this.startActivity(new Intent(PaymentScreen.this, CityList.class));

Answer 3

试试这个

startActivity(new Intent(PaymentScreen.this, LoginScreen.class).putExtra("sendToActivity", "PaymentScreen"));

而不是

PaymentScreen.this.startActivity(new Intent().setClass(PaymentScreen.this, LoginScreen.class).putExtra("sendToActivity", "PaymentScreen"));

你可以像

那样做

Intent in;
if(Singleton.getInstance().selected_city == null) {
        in=new Intent(PaymentScreen.this, CityList.class);
        startActivity(in);
    }
    if(Singleton.getInstance().selected_venue == null) {
        in=new Intent(PaymentScreen.this, VenueList.class);
        startActivity(in);

    }
    if(Singleton.getInstance().selected_event == null) {
        in=new Intent(PaymentScreen.this, EventList.class);
        startActivity(in);
    }
    if(Singleton.getInstance().customer == null) {
        in=new Intent(PaymentScreen.this, LoginScreen.class);
        in.putExtra("sendToActivity", "PaymentScreen");
        startActivity(in);
        Log.d("LineBouncer", "in if statement and (customer == null) is true");
    }
    if(Singleton.getInstance().customer == null) {
        Log.d("LineBouncer", "customer is null");
    }
    new GetPrepurchaseId().execute();

如果你没有提到这个

<activity android:name=".CityList" android:label="@string/app_name"></activity>

在你的清单中

然后声明它。

Answer 4

确保你已经在minifest中定义了它。

最好拨打

 context.startActivity()

insde

Android StartActivity运行但没有任何反应

4 个答案: