Here we will learn how to open camera in android, to open Camera in the android app we have to add

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

permission in our manifest file.

In this example I'm moving to Camera through button click event so I have taken button in my xml file and on its click event I have opened Camera using Intent .

Now copy the code written below in your MainActivity.java  file of your project.
 

MainActivity.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    Button btn=(ImageButton)findViewById(R.id.Take_Image_btn);
    btn.setOnClickListener(mClickListener);
}

View.OnClickListener mClickListener=new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(LoginActivity.this,"ENtered in On ClickListener",Toast.LENGTH_LONG).show();
            Intent mintent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
             startActivity(mintent);
  }
    };

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".LoginActivity">


    <Button
        android:layout_centerHorizontal="true"
        android:id="@+id/Take_Image_btn"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:background="@drawable/button"/>

</RelativeLayout>