如何在运行时设置请求方向？

Question

我希望我的胶子应用程序能够在运行时将方向从横向更改为纵向。我检查了 Gluon Charmdown SDK，它似乎只有 getOrientation 并且没有在运行时设置方向的选项。我不想在 Manifest 中设置固定方向

Answer 1

Charm Down 有一个OrientationService，但正如您所提到的，它是“只读的”，它只会监听方向变化并随时为您提供当前方向。但到目前为止，您可以通过编程方式设置方向。

要包含此功能，有两种选择：克隆 Charm Down、修改 Orientation Service、构建并使用您的自定义构建，或直接创建一个新服务，如 ExtendedOrientationService，您可以直接将其包含在您的项目中。

假设是后者，这是一个非常基本的服务实现，允许以编程方式设置方向：

ExtendedOrientationService.java

package com.gluonhq.charm.down.plugins;

import javafx.geometry.Orientation;

public interface ExtendedOrientationService {

    void coerceOrientation(Orientation orientation);

    void releaseOrientation();

}

ExtendedOrientationServiceFactory.java

package com.gluonhq.charm.down.plugins;

import com.gluonhq.charm.down.DefaultServiceFactory;

public class ExtendedOrientationServiceFactory extends DefaultServiceFactory<ExtendedOrientationService> {

    public ExtendedOrientationServiceFactory() {
        super(ExtendedOrientationService.class);
    }

}

对于安卓：

AndroidExtendedOrientationService.java

package com.gluonhq.charm.down.plugins.android;

import android.content.pm.ActivityInfo;
import com.gluonhq.charm.down.plugins.ExtendedOrientationService;
import javafx.geometry.Orientation;
import javafxports.android.FXActivity;

public class AndroidExtendedOrientationService implements ExtendedOrientationService {

    private final FXActivity instance = FXActivity.getInstance();

    @Override
    public void coerceOrientation(Orientation orientation) {
        if (orientation.equals(Orientation.HORIZONTAL)) {
            instance.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        } else if (orientation.equals(Orientation.VERTICAL)) {
            instance.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        }
        instance.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
    }

    @Override
    public void releaseOrientation() {
        instance.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
    }

}

在 iOS 上：

ExtendedOrientation.h

#import <UIKit/UIKit.h>
#include "jni.h"

@interface ExtendedOrientation : UIViewController {}
    @property (nonatomic, assign) BOOL shouldAutoRotate;

    - (void) setOrientation:(NSString *)orientation;
    - (void) release;
@end

ExtendedOrientation.m

#include "ExtendedOrientation.h"

extern JNIEnv *jEnv;
#define GET_MAIN_JENV \
if (jEnv == NULL) NSLog(@"ERROR: Java has been detached already, but someone is still trying to use it at %s:%s:%d\n", __FUNCTION__, __FILE__, __LINE__);\
JNIEnv *env = jEnv;

JNIEXPORT jint JNICALL
JNI_OnLoad_ExtendedOrientation(JavaVM *vm, void *reserved)
{
#ifdef JNI_VERSION_1_8
    //min. returned JNI_VERSION required by JDK8 for builtin libraries
    JNIEnv *env;
    if ((*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_8) != JNI_OK) {
        return JNI_VERSION_1_4;
    }
    return JNI_VERSION_1_8;
#else
    return JNI_VERSION_1_4;
#endif
}

static int ExtendedOrientationInited = 0;

// ExtendedOrientation
ExtendedOrientation *_extendedOrientation;

JNIEXPORT void JNICALL Java_com_gluonhq_charm_down_plugins_ios_IOSExtendedOrientationService_initOrientation
(JNIEnv *env, jclass jClass)
{
    if (ExtendedOrientationInited)
    {
        return;
    }
    ExtendedOrientationInited = 1;

    _extendedOrientation = [[ExtendedOrientation alloc] init];
}

JNIEXPORT void JNICALL Java_com_gluonhq_charm_down_plugins_ios_IOSExtendedOrientationService_setOrientation
(JNIEnv *env, jclass jClass, jstring jOrientation)
{
    const jchar *charsOrientation = (*env)->GetStringChars(env, jOrientation, NULL);
    NSString *orientation = [NSString stringWithCharacters:(UniChar *)charsOrientation length:(*env)->GetStringLength(env, jOrientation)];
    (*env)->ReleaseStringChars(env, jOrientation, charsOrientation);
    [_extendedOrientation setOrientation:orientation];
}

JNIEXPORT void JNICALL Java_com_gluonhq_charm_down_plugins_ios_IOSExtendedOrientationService_release
(JNIEnv *env, jclass jClass)
{
    [_extendedOrientation release];
}

@implementation ExtendedOrientation

-(void) setOrientation:(NSString*)orientation
{
    _shouldAutoRotate = YES;

    NSLog(@"Set orientation: %@", orientation);
    if ([orientation isEqualToString:@"HORIZONTAL"])
    {
        [[UIDevice currentDevice] setValue:[NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft] forKey:@"orientation"];
    } else
    {
        [[UIDevice currentDevice] setValue:[NSNumber numberWithInt:UIInterfaceOrientationPortrait] forKey:@"orientation"];
    }
}

- (void) release
{
    _shouldAutoRotate = NO;
}

- (BOOL)shouldAutorotate
{
    return _shouldAutoRotate;
}

@end

IOSExtendedOrientationService.java

package com.gluonhq.charm.down.plugins.ios;

import com.gluonhq.charm.down.plugins.ExtendedOrientationService;
import javafx.geometry.Orientation;

public class IOSExtendedOrientationService implements ExtendedOrientationService {

    static {
        System.loadLibrary("ExtendedOrientation");
        initOrientation();
    }

    @Override
    public void coerceOrientation(Orientation orientation) {
        setOrientation(orientation.toString());
    }

    @Override
    public void releaseOrientation() {
        release();
    }

    // native
    private static native void initOrientation();
    private static native void setOrientation(String orientation);
    private static native void release();

}

现在从这个sample 添加ios-gradle.build 文件。

最后我们需要构建并包含原生库：

build.gradle

apply from: 'ios-build.gradle'


task xcodebuild {
    doLast {
        xcodebuildIOS("$project.buildDir","$project.projectDir", "ExtendedOrientation")
    }
}

task installNativeLib (type:Copy, dependsOn: xcodebuild) {
    from("$project.buildDir/native")
    into("src/ios/jniLibs")
    include("*.a")
}

您可以使用以下方法构建库并将其添加到项目中：

./gradlew installNativeLib 

示例

这个 sn-p 显示了如何使用这个服务：如果方向是垂直的，它将强制水平方向，否则它将释放方向：

Services.get(ExtendedOrientationService.class).ifPresent(o -> {
            Orientation orientation = Services.get(OrientationService.class)
                    .flatMap(OrientationService::getOrientation)
                    .orElse(Orientation.HORIZONTAL);

            if (orientation == Orientation.VERTICAL) {
                o.coerceOrientation(Orientation.HORIZONTAL);
            } else {
                o.releaseOrientation();
            }
        });