如何在对话框中保持沉浸式模式？

时间：2014-04-01 18:33:37

标签： android dialog android-activity android-dialog android-4.4-kitkat

当我的活动显示自定义对话框时，如何维护新的沉浸式模式？

我使用下面的代码来维护对话框中的沉浸式模式，但是使用该解决方案，当我启动自定义对话框时，NavBar会出现不到一秒钟，然后它就会消失。

以下视频更好地解释了问题（在NavBar出现时查看屏幕底部）：http://youtu.be/epnd5ghey8g

如何避免此行为？

CODE

我申请中所有活动的父亲：

public abstract class ImmersiveActivity extends Activity {

    @SuppressLint("NewApi")
    private void disableImmersiveMode() {
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
            getWindow().getDecorView().setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_FULLSCREEN
            );
        }
    }

    @SuppressLint("NewApi")
    private void enableImmersiveMode() {
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
            getWindow().getDecorView().setSystemUiVisibility(
                      View.SYSTEM_UI_FLAG_LAYOUT_STABLE 
                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 
                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN 
                    | View.SYSTEM_UI_FLAG_FULLSCREEN 
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY 
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
            );
        }
    }


    /**
     * Set the Immersive mode or not according to its state in the settings:
     * enabled or not.
     */
    protected void updateSystemUiVisibility() {
        // Retrieve if the Immersive mode is enabled or not.
        boolean enabled = getSharedPreferences(Util.PREF_NAME, 0).getBoolean(
                "immersive_mode_enabled", true);

        if (enabled) enableImmersiveMode();
        else disableImmersiveMode();
    }

    @Override
    public void onResume() {
        super.onResume();
        updateSystemUiVisibility();
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        updateSystemUiVisibility();
    }

}

我的所有自定义对话框都使用onCreate(. . .)方法调用此方法：

/**
 * Copy the visibility of the Activity that has started the dialog {@link mActivity}. If the
 * activity is in Immersive mode the dialog will be in Immersive mode too and vice versa.
 */
@SuppressLint("NewApi")
private void copySystemUiVisibility() {
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
        getWindow().getDecorView().setSystemUiVisibility(
                mActivity.getWindow().getDecorView().getSystemUiVisibility()
        );
    }
}

编辑 - 解决方案（感谢Beaver6813，详细了解他的答案）：

我的所有自定义对话框都以这种方式覆盖了show方法：

/**
 * An hack used to show the dialogs in Immersive Mode (that is with the NavBar hidden). To
 * obtain this, the method makes the dialog not focusable before showing it, change the UI
 * visibility of the window like the owner activity of the dialog and then (after showing it)
 * makes the dialog focusable again.
 */
@Override
public void show() {
    // Set the dialog to not focusable.
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

    copySystemUiVisibility();

    // Show the dialog with NavBar hidden.
    super.show();

    // Set the dialog to focusable again.
    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
}

7 个答案:

答案 0 :(得分：147)

经过对该问题的大量研究后，有一个hacky修复此问题，涉及拆分Dialog类以找到。即使在将UI可见性添加到管理器之前设置了UI可见性，也会在将对话框窗口添加到窗口管理器时显示导航栏。在Android Immersive example中，评论说：

// * Uses semi-transparent bars for the nav and status bars
// * This UI flag will *not* be cleared when the user interacts with the UI.
// When the user swipes, the bars will temporarily appear for a few seconds and then
// disappear again.

我相信这就是我们在这里看到的（当一个新的，可聚焦的窗口视图被添加到管理器时，就会触发用户交互）。

我们如何解决这个问题？在我们创建对话框时使对话框不可聚焦（因此我们不会触发用户交互），然后在显示后使其可聚焦。

//Here's the magic..
//Set the dialog to not focusable (makes navigation ignore us adding the window)
dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

//Show the dialog!
dialog.show();

//Set the dialog to immersive
dialog.getWindow().getDecorView().setSystemUiVisibility(
context.getWindow().getDecorView().getSystemUiVisibility());

//Clear the not focusable flag from the window
dialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

显然这不太理想，但它似乎是一个Android错误，他们应该检查Window是否具有沉浸式设置。

我已将我的工作测试代码（原谅hacky messiness）更新为Github。我已经在Nexus 5仿真器上进行了测试，它可能会比KitKat更低，但仅用于概念验证。

答案 1 :(得分：22)

为了您的信息，感谢@ Beaver6813的回答，我已经能够使用DialogFragment实现这一点。

在我的DialogFragment的onCreateView方法中，我刚刚添加了以下内容：

    getDialog().getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
    getDialog().getWindow().getDecorView().setSystemUiVisibility(getActivity().getWindow().getDecorView().getSystemUiVisibility());

    getDialog().setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {
            //Clear the not focusable flag from the window
            getDialog().getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

            //Update the WindowManager with the new attributes (no nicer way I know of to do this)..
            WindowManager wm = (WindowManager) getActivity().getSystemService(Context.WINDOW_SERVICE);
            wm.updateViewLayout(getDialog().getWindow().getDecorView(), getDialog().getWindow().getAttributes());
        }
    });

答案 2 :(得分：16)

如果您想使用 onCreateDialog（），请尝试使用此类。它对我来说非常好...... 

public class ImmersiveDialogFragment extends DialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        AlertDialog alertDialog = new AlertDialog.Builder(getActivity())
                .setTitle("Example Dialog")
                .setMessage("Some text.")
                .create();

        // Temporarily set the dialogs window to not focusable to prevent the short
        // popup of the navigation bar.
        alertDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

        return alertDialog;

    }

    public void showImmersive(Activity activity) {

        // Show the dialog.
        show(activity.getFragmentManager(), null);

        // It is necessary to call executePendingTransactions() on the FragmentManager
        // before hiding the navigation bar, because otherwise getWindow() would raise a
        // NullPointerException since the window was not yet created.
        getFragmentManager().executePendingTransactions();

        // Hide the navigation bar. It is important to do this after show() was called.
        // If we would do this in onCreateDialog(), we would get a requestFeature()
        // error.
        getDialog().getWindow().getDecorView().setSystemUiVisibility(
            getActivity().getWindow().getDecorView().getSystemUiVisibility()
        );

        // Make the dialogs window focusable again.
        getDialog().getWindow().clearFlags(
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
        );

    }

}

要显示对话框，请在您的活动中执行以下操作... 

new ImmersiveDialogFragment().showImmersive(this);

答案 3 :(得分：6)

在这里结合答案我创建了一个适用于所有情况的抽象类：

public abstract class ImmersiveDialogFragment extends DialogFragment {

    @Override
    public void setupDialog(Dialog dialog, int style) {
        super.setupDialog(dialog, style);

        // Make the dialog non-focusable before showing it
        dialog.getWindow().setFlags(
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
    }

    @Override
    public void show(FragmentManager manager, String tag) {
        super.show(manager, tag);
        showImmersive(manager);
    }

    @Override
    public int show(FragmentTransaction transaction, String tag) {
        int result = super.show(transaction, tag);
        showImmersive(getFragmentManager());
        return result;
    }

    private void showImmersive(FragmentManager manager) {
        // It is necessary to call executePendingTransactions() on the FragmentManager
        // before hiding the navigation bar, because otherwise getWindow() would raise a
        // NullPointerException since the window was not yet created.
        manager.executePendingTransactions();

        // Copy flags from the activity, assuming it's fullscreen.
        // It is important to do this after show() was called. If we would do this in onCreateDialog(),
        // we would get a requestFeature() error.
        getDialog().getWindow().getDecorView().setSystemUiVisibility(
                getActivity().getWindow().getDecorView().getSystemUiVisibility()
        );

        // Make the dialogs window focusable again
        getDialog().getWindow().clearFlags(
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
        );
    }
}

答案 4 :(得分：5)

这也适用于对话片段的onDismiss方法。在该方法中，调用它附加到的活动的方法再次设置全屏标志。

@Override
    public void onDismiss(DialogInterface dialog) {
        super.onDismiss(dialog);
        Logger.e(TAG, "onDismiss");
        Log.e("CallBack", "CallBack");
        if (getActivity() != null &&
                getActivity() instanceof LiveStreamingActivity) {
            ((YourActivity) getActivity()).hideSystemUI();
        }
    }

在您的活动中添加此方法：

public void hideSystemUI() {
        // Set the IMMERSIVE flag.
        // Set the content to appear under the system bars so that the content
        // doesn't resize when the system bars hide and show.
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
                        | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }

答案 5 :(得分：4)

如果您正在创建自己的DialogFragment，则只需覆盖此方法。

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    Dialog dialog = super.onCreateDialog(savedInstanceState);

    dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

    return dialog;
}

答案 6 :(得分：2)

我知道这是旧帖，但我的回答可能对其他人有帮助。

以下是对话中沉浸式效果的hacky修复：

public static void showImmersiveDialog(final Dialog mDialog, final Activity mActivity) {
        //Set the dialog to not focusable
        mDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
        mDialog.getWindow().getDecorView().setSystemUiVisibility(setSystemUiVisibility());

        mDialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {
                //Clear the not focusable flag from the window
                mDialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

                //Update the WindowManager with the new attributes
                WindowManager wm = (WindowManager) mActivity.getSystemService(Context.WINDOW_SERVICE);
                wm.updateViewLayout(mDialog.getWindow().getDecorView(), mDialog.getWindow().getAttributes());
            }
        });

        mDialog.getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                    mDialog.getWindow().getDecorView().setSystemUiVisibility(setSystemUiVisibility());
                }

            }
        });
    }

    public static int setSystemUiVisibility() {
        return View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
    }
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