Android中实现调用摄像头拍照并显示在ImageView中

谁践踏了优雅 2023-10-05 14:50 36阅读 0赞

## 场景 ##

点击拍照按钮调用系统摄像机进行拍照，并将拍的照片显示在ImageView中。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

注：

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[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
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## 实现 ##

新建一个Activity,设计其布局如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

布局xml文件为

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout 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"
        android:orientation="vertical"
        tools:context=".CameraActivity">
    
        <Button
            android:id="@+id/button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="启动摄像头" />
    
        <ImageView
            android:id="@+id/iv_camera"
            android:layout_width="350dp"
            android:layout_height="350dp"
            android:layout_gravity="center"
            android:layout_marginTop="20dp" />
    
    </LinearLayout>

然后在对应的Activity中，通过指定Action的Intent来调用系统摄像头，并采用带返回结果的方式启动Activity,

然后在重写的获取Activity返回结果的方法中，判断请求码与上面自定义的常量一致并且请求结果为OK

那么通过将data强转为Bitmap并给ImageView设置数据源进行显示

package com.badao.androidstudy;
    
    import androidx.annotation.Nullable;
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.content.Intent;
    import android.graphics.Bitmap;
    import android.os.Bundle;
    import android.provider.MediaStore;
    import android.view.View;
    import android.widget.Button;
    import android.widget.ImageView;
    
    public class CameraActivity extends AppCompatActivity {
    
    
        private Button btnCamera;
        private ImageView imageView;
        private final int CAMERA_REQUEST = 10;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_camera);
            initView();
        }
    
    
        @Override
        protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            switch (requestCode) {
                case CAMERA_REQUEST:
                    if (resultCode == RESULT_OK) {
                        Bitmap bitmap = (Bitmap) data.getExtras().get("data");
                        imageView.setImageBitmap(bitmap);
                    }
                    break;
            }
        }
    
        public void initView(){
            imageView = findViewById(R.id.iv_camera);
            btnCamera = findViewById(R.id.button);
            btnCamera.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    startActivityForResult(intent,CAMERA_REQUEST);
                }
            });
        }
    }

### 示例效果 ###

![20201201202757686.gif][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20201201202728800.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201201202733641.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[20201201202757686.gif]: https://img-blog.csdnimg.cn/20201201202757686.gif