第6讲 open和close camera代码实现 -凯发k8手机登录

本讲是android camera专题系列的第6讲，我们介绍android camera2 api专题的open、close camera代码实现部分。

更多资源：

枚举camera数量

public int getnumberofcameras() {
    try {
        string[] cameraidarray = mcameramanager.getcameraidlist();
        if(mydebug.log) {
            log.d(tag, "getcameraidlist length:"   cameraidarray.length);
        }
        for (int i = 0; i < cameraidarray.length; i  ) {
            islogicalmulticamera(mcontext, i);
            if(mydebug.log) {
                log.d(tag, "cameraid:"  i   ", facing:"   getfacing(i));
            }
        }
        return cameraidarray.length;
    } catch(throwable e) {
        if(mydebug.log) {
            log.e(tag, "exception trying to get camera ids");
        }
        e.printstacktrace();
    }
    return 0;
}

判断camera facing

@override
public cameracontroller.facing getfacing(int cameraid) {
    try {
        string cameraids = mcameramanager.getcameraidlist()[cameraid];
        cameracharacteristics characteristics = mcameramanager.getcameracharacteristics(cameraids);
        switch(characteristics.get(cameracharacteristics.lens_facing)) {
            case camerametadata.lens_facing_front:
                return cameracontroller.facing.facing_front;
            case camerametadata.lens_facing_back:
                return cameracontroller.facing.facing_back;
            case camerametadata.lens_facing_external:
                return cameracontroller.facing.facing_external;
        }
        log.e(tag, "unknown camera_facing: "   characteristics.get(cameracharacteristics.lens_facing));
    } catch(throwable e) {
        if(mydebug.log)
            log.e(tag, "exception trying to get camera characteristics");
        e.printstacktrace();
    }
    return cameracontroller.facing.facing_unknown;
}

判断是否是logical multicamera

@override
public boolean islogicalmulticamera(context context, int cameraid) {
    try {
        string cameraids = mcameramanager.getcameraidlist()[cameraid];
        cameracharacteristics characteristics = mcameramanager.getcameracharacteristics(cameraids);
        set physicalcameraids = characteristics.getphysicalcameraids();
        int[] capabilities = characteristics.get(cameracharacteristics.request_available_capabilities);
        list capabilitieslist = new arraylist<>();
        for(integer capability : capabilities) {
            capabilitieslist.add(capability);
        }
        int logicalmulticameraid = cameracharacteristics.request_available_capabilities_logical_multi_camera;
        log.d(tag, "(logicalcamera: "   cameraids  
                ",physicalcameraids:"   physicalcameraids.tostring()  
                ",has logical_multi_camera capability:"  
                capabilitieslist.contains(logicalmulticameraid)   ")");
        return capabilitieslist.contains(logicalmulticameraid) && (capabilities.length > 0);
    } catch (throwable e) {
        if(mydebug.log)
            log.e(tag, "exception trying to islogicalmulticamera.");
        e.printstacktrace();
    }
    return false;
}

opencamera流程代码实现

实战代码流程

preview#onsurfacetextureavailable
    preview#mysurfacecreated
        preview#opencamera
            preview#mopencameratask.execute();
                preview#opencameracore
                    new cameracontroller2
                        manager.opencamera

close camera代码实现

实战代码流程

preview#onsurfacetexturedestroyed
    preview#mysurfacedestroyed
        preview#closecamera
            new closecameratask
                cameracontroller2#release
                    mcameradevice.close