android - setParameters() failed on Zooming In using Zoom Controls -


i new android. working on camera app , using camera kit api. adding zoom functionality using camera api , implementing using zoom controls. when set parameters to parameter.setzoom(int value) java runtime exception setparameters failed. please help. have attached logs , code in snippet.

package com.lamaan.magmicrocam;  import android.manifest; import android.content.context; import android.content.pm.packagemanager; import android.graphics.bitmap; import android.graphics.bitmapfactory; import android.graphics.imageformat; import android.graphics.surfacetexture; import android.hardware.camera; import android.hardware.camera2.cameraaccessexception; import android.hardware.camera2.cameracapturesession; import android.hardware.camera2.cameracharacteristics; import android.hardware.camera2.cameradevice; import android.hardware.camera2.cameramanager; import android.hardware.camera2.camerametadata; import android.hardware.camera2.capturerequest; import android.hardware.camera2.totalcaptureresult; import android.hardware.camera2.params.streamconfigurationmap; import android.media.image; import android.media.imagereader; import android.os.bundle; import android.os.environment; import android.os.handler; import android.os.handlerthread; import android.support.annotation.nonnull; import android.support.annotation.nullable; import android.support.v4.app.activitycompat; import android.support.v7.app.appcompatactivity; import android.util.log; import android.util.size; import android.util.sparseintarray; import android.view.surface; import android.view.textureview; import android.view.view; import android.widget.button; import android.widget.toast; import android.widget.zoomcontrols;  import com.flurgle.camerakit.camera1; import com.flurgle.camerakit.camerakit; import com.flurgle.camerakit.cameralistener; import com.flurgle.camerakit.cameraview;  import java.io.file; import java.io.filenotfoundexception; import java.io.fileoutputstream; import java.io.ioexception; import java.io.outputstream; import java.nio.bytebuffer; import java.util.arraylist; import java.util.arrays; import java.util.list;      public class microscopeacitvity extends appcompatactivity implements view.onclicklistener {          cameraview cameraview;         button cameratakepic;         button buttonflash;         zoomcontrols zoomcontrols;         camera mcamera;         camera.parameters params;         int currentzoomlevel = 0;         float currentzoom;          @override         protected void oncreate(@nullable bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.activity_microscope_acitvity);              cameraview = (cameraview) findviewbyid(r.id.camera);              cameratakepic = (button) findviewbyid(r.id.button_take_picture);             cameratakepic.setonclicklistener(this);              buttonflash = (button) findviewbyid(r.id.button_flash);             buttonflash.setonclicklistener(this);              zoomcontrols = (zoomcontrols) findviewbyid(r.id.microscope_zoom_control);              cameraview.setcameralistener(new cameralistener() {                  @override                 public void onpicturetaken(byte[] picture) {                     super.onpicturetaken(picture);                      // create bitmap                     bitmap result = bitmapfactory.decodebytearray(picture, 0, picture.length);                 }             });               // *************** zoom implementation starts here ********************               mcamera = camera.open();             if (mcamera.getparameters() != null){                 params = mcamera.getparameters();             }              if (params.iszoomsupported()) {                 final int maxzoomlevel = params.getmaxzoom();                 log.i("max zoom ", "is " + maxzoomlevel);                 zoomcontrols.setiszoominenabled(true);                 zoomcontrols.setiszoomoutenabled(true);                  zoomcontrols.setonzoominclicklistener(new view.onclicklistener(){                     public void onclick(view v){                         if(currentzoomlevel < maxzoomlevel){                             currentzoomlevel++;                              //mcamera.startsmoothzoom(currentzoomlevel);                             params.setzoom(currentzoomlevel);                             mcamera.setparameters(params);                         }                     }                 });                  zoomcontrols.setonzoomoutclicklistener(new view.onclicklistener(){                     public void onclick(view v){                         if(currentzoomlevel > 0){                             currentzoomlevel--;                             params.setzoom(currentzoomlevel);                             mcamera.setparameters(params);                         }                     }                 });             }             else                 zoomcontrols.setvisibility(view.gone);              // *************** zoom implementation ends here ********************           }            @override         protected void onresume() {             super.onresume();             cameraview.start();         }          @override         protected void onpause() {             cameraview.stop();             super.onpause();         }           @override         public void onclick(view v) {             int id;             id = v.getid();              if(id == r.id.button_take_picture){                 cameraview.captureimage();             }              if(id == r.id.button_flash){                 cameraview.setflash(camerakit.constants.flash_on);             }           }     }

error stack trace:

08-15 14:50:37.369 1766-1766/com.lamaan.magmicrocam e/androidruntime: fatal exception: main process: com.lamaan.magmicrocam, pid: 1766 java.lang.runtimeexception: setparameters failed @ android.hardware.camera.native_setparameters(native method) @ android.hardware.camera.setparameters(camera.java:1984) @ com.lamaan.magmicrocam.microscopeacitvity$2.onclick(microscopeacitvity.java:110) @ android.view.view.performclick(view.java:5721) @ android.view.view$performclick.run(view.java:22620) @ android.os.handler.handlecallback(handler.java:739) @ android.os.handler.dispatchmessage(handler.java:95) @ android.os.looper.loop(looper.java:148) @ android.app.activitythread.main(activitythread.java:7406) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1230) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1120)


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