Question

我有FirstRunActivity和MainActivity（启动器）。当应用程序打开并且第一次打开应用程序时，我启动FirstRunActivity（具有清除活动历史记录）。

它工作正常。但是当在设备中打开自动旋转，然后用旋转设备打开应用程序时，屏幕闪烁。在日志中，我可以看到活动在循环中重新创建。

记录：

3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:00.390    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:00.410    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:00.410    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:00.480    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:00.480    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:00.520    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:00.520    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:00.630    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:00.630    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:00.680    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:00.680    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:00.800    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:00.810    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:00.870    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:00.870    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:00.960    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:00.970    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:00.990    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:00.990    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:01.060    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:01.060    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:01.080    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:01.080    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:01.150    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:01.150    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:01.180    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:01.180    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:01.250    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause
04-17 22:49:01.250    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop
04-17 22:49:01.280    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart
04-17 22:49:01.280    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume
04-17 22:49:01.430    3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause

FirstRunActivity.java：

public class FirstRunActivity extends ActionBarActivity {

    @InjectView(R.id.password) EditText passwordView;
    @InjectView(R.id.password_retype) EditText passwordRetypeView;
    @InjectView(R.id.save) View saveButton;

    @Override
    protected void onCreate( Bundle savedInstanceState ) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first_run);
        ButterKnife.inject(this);
    }

    @Override protected void onStart() {
        super.onStart();
        U.l("FirstRunActivity onStart");
    }

    @Override protected void onStop() {
        super.onStart();
        U.l("FirstRunActivity onStop");
    }

    @Override protected void onPause() {
        super.onStart();
        U.l("FirstRunActivity onPause");
    }

    @Override protected void onResume() {
        super.onStart();
        U.l("FirstRunActivity onResume");
    }
}

MainActivity.java：

@Override
    protected void onCreate( Bundle savedInstanceState ) {
        super.onCreate(savedInstanceState);
        settingsManager = SettingsManager.getInstance(this);
        //If app not initialized
        if (! settingsManager.isAppInitialized()) {
            Intent intent = new Intent(this, FirstRunActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
            ComponentName cn = intent.getComponent();
            Intent mainIntent = IntentCompat.makeRestartActivityTask(cn);
            startActivity(mainIntent);
               finish();
        } else {
            //Other code
        }
}

如果我通过刚启动活动更改启动首次运行活动的代码（在MainActivity.java中），则活动不会闪烁，但是当按下后退按钮时，它将打开带有白色屏幕的MainActivity。或者通过其他方式清除活动历史记录：Clear the entire history stack and start a new activity on Android屏幕无论如何都会闪烁。

那我怎么能停止眨眼和清除活动历史呢？

修改

经过测试，我发现在我的其他活动中，与上面的代码没有关系，有同样的问题，闪烁。使用旋转设备打开活动时。

Answer 1

查看IntentCompat.makeRestartActivityTask的文档，听起来它创建了一个用于重新启动当前活动的intent。我建议删除这两行：

ComponentName cn = intent.getComponent();
Intent mainIntent = IntentCompat.makeRestartActivityTask(cn);

我在改变活动时从不需要它们。

另外，对mContext.finish（）的调用只能用finish（）来完成，在这种情况下永远不能为null，很可能你看到白屏的原因是mContext为null，所以你永远不会成功完成了这项活动。

Answer 2

您需要使用NoDisplay主题在清单中定义活动。然后，启动FirstRunActivity或LoginActivity（或其他）。除非您支持HoneyComb以下版本，否则不需要IntentCompat，您可以使用FLAG_ACTIVITY_CLEAR_TASK

请参阅https://stackoverflow.com/a/4892712/218473

活动重新创建和闪烁

2 个答案: