title: android api 21+ camera2 api
body: <p>i try to run this code, but it say that there is some thing not found in framworke.jar </p>
  
  <pre><code> super.onCreate(savedInstanceState);
      CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
  
      String id = null;
      try {
          id = manager.getCameraIdList()[0];
      } catch (CameraAccessException e) {
          e.printStackTrace();
      }
      try {
          manager.setTorchMode(id,true);
      } catch (CameraAccessException e) {
          e.printStackTrace();
      }
  </code></pre>
  
  <p>but i got this error, </p>
  
  <pre><code>02-15 01:03:33.794 32378-32378/com.phenix.testcam E/AndroidRuntime: FATAL EXCEPTION: main
                                                                  Process: com.phenix.testcam, PID: 32378
                                                                  java.lang.NoSuchMethodError: No virtual method setTorchMode(Ljava/lang/String;Z)V in class Landroid/hardware/camera2/CameraManager; or its super classes (declaration of 'android.hardware.camera2.CameraManager' appears in /system/framework/framework.jar)
                                                                      at com.phenix.testcam.MainActivity.onCreate(MainActivity.java:29)
                                                                      at android.app.Activity.performCreate(Activity.java:5990)
                                                                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
                                                                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
                                                                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
                                                                      at android.app.ActivityThread.access$800(ActivityThread.java:156)
                                                                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
                                                                      at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                      at android.os.Looper.loop(Looper.java:211)
                                                                      at android.app.ActivityThread.main(ActivityThread.java:5373)
                                                                      at java.lang.reflect.Method.invoke(Native Method)
                                                                      at java.lang.reflect.Method.invoke(Method.java:372)
                                                                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
                                                                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
  </code></pre>
  
  <p>plz i need some explanations</p>