在条件下启动活动会在屏幕上产生闪烁 [英] Starting Activity on condition produces a flicker on screen

问题描述

我有一个没有UI的MainActivity，它具有确定用户是否已经登录的某些逻辑.如果用户已登录，则我将启动HomeActivity，否则，将启动LoginActivity.尽管逻辑工作正常，但我发现MainActivity确实会短暂启动，然后再切换到所需的活动.有什么方法可以避免完全引起MainActivity的问题，因为它会引起烦人的闪烁?

I have a UI-less MainActivity, which holds certain logic to determine if the user is already logged in or not. If the user is logged in, I am starting HomeActivity and if not, then LoginActivity. Even though the logic is working fine, I am seeing that the MainActivity does start for a brief while before switching to desired activity. Is there any way to avoid bringing up MainActivity altogether as it causes an annoying flicker ?

这是我的代码(省略逻辑)-

Here is my code (omitting the logic) -

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (condition) {
            intent = new Intent(this, HomeActivity.class);
        } else {
            intent = new Intent(this, LoginActivity.class);
        }

        startActivity(intent);
        finish();
    }
}

谢谢.

修改

这就是我的android清单中的内容-

This is what I have in my android manifest -

    <activity
        android:name="org.step.main.MainActivity"
        android:label="@string/app_name"
        android:launchMode="singleInstance" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

推荐答案

您可以尝试在意图上设置FLAG_ACTIVITY_NO_ANIMATION

You can try setting FLAG_ACTIVITY_NO_ANIMATION on the intent

intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);

和/或在调用finish()之后调用overridePendingTransition(0, 0)

and/or call overridePendingTransition(0, 0) after calling finish()

您还可以用Fragments替换活动-使MainActivity具有全屏标记，并用登录Fragment或Home Fragment替换.

You could also replace the activities with Fragments - have the MainActivity with a fullscreen scontainer that you replace with a login Fragment or a Home Fragment.

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