Android 简单调用摄像头

IDE: android studio3.1.2

界面：

activity_main2.xml

代码

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Main2Activity">


    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout 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:orientation="vertical"
            tools:context=".Main2Activity">


            <TextView
                android:layout_width="wrap_content"
                android:layout_height="80dp"
                android:gravity="center"
                android:layout_gravity="center"
                android:text=""
                />

            <ImageView
                android:id="@+id/imageIV"
                android:layout_width="300dp"
                android:layout_height="300dp"
                android:layout_gravity="center" />
            <Button
                android:id="@+id/takephotoTV"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center"

                android:text="开启相机" />

        </LinearLayout>


    </LinearLayout>

    

</android.support.constraint.ConstraintLayout>

package com.example.mark.demo01;

import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class Main2Activity extends AppCompatActivity {

    @BindView(R.id.takephotoTV)
    Button takephotoTV;
    @BindView(R.id.imageIV)
    ImageView imageIV;

    private final int CAMERA_REQUEST = 8888;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        ButterKnife.bind(this);
    }

    @OnClick(R.id.takephotoTV)
    public void onClick() {
        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(cameraIntent, CAMERA_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
            Bitmap photo = (Bitmap) data.getExtras().get("data");
            imageIV.setImageBitmap(photo);
        }
    }
}

 从课设中挑出来的模块，可能会有点小错，无伤大雅