qt创建surfaceview

在Qt中创建SurfaceView需要使用AndroidJNI，具体步骤如下：

1. 在.pro文件中添加以下内容：

android {
    QT += androidextras
    ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android
    ANDROID_EXTRA_LIBS = $$PWD/android/libs
    ANDROID_PERMISSIONS = android.permission.CAMERA,android.permission.RECORD_AUDIO

    # Define Android ABI-specific folders
    ANDROID_EXTRA_LIBS += \
        $$PWD/android/libs/armeabi-v7a \
        $$PWD/android/libs/arm64-v8a \
        $$PWD/android/libs/x86 \
        $$PWD/android/libs/x86_64

    # Define your Java source files
    ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android
    ANDROID_PACKAGE_BUILD_DIR = $$PWD/android-build
    ANDROID_DEPLOYMENT_SETTINGS += \
        android-extra-libs.json \
        android-extra-libs-armeabi-v7a.json \
        android-extra-libs-arm64-v8a.json \
        android-extra-libs-x86.json \
        android-extra-libs-x86_64.json
}

2. 在android文件夹下创建AndroidManifest.xml文件，并添加以下内容：

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>

<application
    android:name="android.app.Application"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <activity
        android:name="org.qtproject.qt5.android.bindings.QtActivity"
        android:label="@string/app_name"
        android:configChanges="orientation|screenSize|keyboardHidden">

        <meta-data android:name="android.app.lib_name" android:value="Qt5Core"/>
        <meta-data android:name="android.app.qt_sources_resource_id" android:resource="@array/qt_sources"/>
        <meta-data android:name="android.app.repository" android:value="default"/>
        <meta-data android:name="android.app.qt_libs_resource_id" android:resource="@array/qt_libs"/>
        <meta-data android:name="android.app.bundled_libs_resource_id" android:resource="@array/bundled_libs"/>
        <meta-data android:name="android.app.bundle_local_qt_libs" android:value="armeabi-v7a:Qt5AndroidExtras_armeabi-v7a,arm64-v8a:Qt5AndroidExtras_arm64-v8a,x86:Qt5AndroidExtras_x86,x86_64:Qt5AndroidExtras_x86_64"/>
        <meta-data android:name="android.app.bundled_in_lib_resource_id" android:resource="@array/bundled_in_lib"/>
        <meta-data android:name="android.app.qt_cflags" android:value="-fstack-protector-strong -DANDROID -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -mthumb -O2 -g -DNDEBUG -std=c++11 -Werror -Wall -Wno-unused-value -Wno-unused-function -Wno-unused-variable -Wno-deprecated-declarations -D__ANDROID_API__=19"/>
        <meta-data android:name="android.app.qt_cppflags" android:value="-fstack-protector-strong -DANDROID -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -mthumb -O2 -g -DNDEBUG -std=c++11 -Werror -Wall -Wno-unused-value -Wno-unused-function -Wno-unused-variable -Wno-deprecated-declarations -D__ANDROID_API__=19"/>
        <meta-data android:name="android.app.qt_ldflags" android:value="-Wl,-rpath=/data/data/org.qtproject.example.Surfacetest/files/qt/lib -Wl,-rpath-link,/data/data/org.qtproject.example.Surfacetest/files/qt/lib -Wl,-rpath-link,$ORIGIN/lib -L/data/data/org.qtproject.example.Surfacetest/files/qt/lib -lQt5AndroidExtras"/>
        <meta-data android:name="android.app.qt_static_cppflags" android:value=""/>
        <meta-data android:name="android.app.qt_static_ldflags" android:value=""/>
        <meta-data android:name="android.app.qt_tr_sources_resource_id" android:resource="@array/qt_tr_sources"/>
        <meta-data android:name="android.app.qt_translation" android:resource="@array/qt_translation"/>
        <meta-data android:name="android.architecture" android:value="armeabi-v7a"/>
    </activity>

    <activity
        android:name="org.qtproject.qt5.android.bindings.QtService"
        android:process=":qt"/>

    <meta-data android:name="android.app.lib_name" android:value="Qt5AndroidExtras"/>
</application>

<uses-sdk android:minSdkVersion="19" android:targetSdkVersion="26"/>

3. 在android文件夹下创建build.gradle文件，并添加以下内容：

dependencies {
    compile files('libs/Qt5AndroidExtras.jar')
    compile files('libs/libQt5AndroidExtras_armeabi-v7a.so')
    compile files('libs/libQt5AndroidExtras_arm64-v8a.so')
    compile files('libs/libQt5AndroidExtras_x86.so')
    compile files('libs/libQt5AndroidExtras_x86_64.so')
}

4. 在C++代码中使用AndroidJNI来创建SurfaceView，以下是一个示例：

void MyWidget::createSurfaceView()
{
    QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");
    if (activity.isValid()) {
        QAndroidJniObject viewGroup = QAndroidJniObject::callStaticObjectMethod("android/view/View", "getRootView", "()Landroid/view/View;");
        if (viewGroup.isValid()) {
            QAndroidJniObject surfaceView = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "createSurfaceView", "(Landroid/content/Context;)Landroid/view/SurfaceView;", activity.object());
            if (surfaceView.isValid()) {
                surfaceView.callMethod<void>("setZOrderMediaOverlay", "(Z)V", true);
                surfaceView.callMethod<void>("setZOrderOnTop", "(Z)V", true);
                surfaceView.callMethod<void>("setBackgroundColor", "(I)V", 0x00000000);
                QAndroidJniObject layoutParams = QAndroidJniObject("android/view/ViewGroup$LayoutParams", "(II)V", 0, 0);
                viewGroup.callMethod<void>("addView", "(Landroid/view/View;Landroid/view/ViewGroup$LayoutParams;)V", surfaceView.object(), layoutParams.object());
            }
        }
    }
}

在createSurfaceView方法中，我们使用了QAndroidJniObject来获取Android Activity和ViewGroup，然后使用QtNative类中的createSurfaceView静态方法来创建SurfaceView，并将其添加到ViewGroup中。

需要注意的是，SurfaceView需要设置setZOrderMediaOverlay和setZOrderOnTop方法为true，才能在Qt应用中正常显示。此外，为了避免SurfaceView遮挡其他控件，我们还需要将其背景颜色设置为透明。