打开相机

权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE">

</uses-permission>

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

//布局

<ImageView
    android:id="@+id/iv_photo"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:src="@mipmap/ic_launcher"

/>


<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onClick="caijian"
    android:text="打开相机裁剪"

    />

public class MainActivity extends AppCompatActivity {
 private     ImageView img_view;
    private  Button butt_11;
    private  ImageView iv_photo;
    private Uri uri;
    private String mFilePath;
    private static int REQUEST_CAMERA_1 = 1;

    private static int REQUEST_CAMERA_2 = 2;

    private static int RESULT_LOAD_IMAGE = 1;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //
        butt_11 = (Button) findViewById(R.id.butt_11);
        iv_photo= (ImageView) findViewById(R.id.iv_photo);
        ///图库加载
     butt_11.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
          Intent intent=new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
          startActivityForResult(intent,RESULT_LOAD_IMAGE);
      }
  });

    }
    public  void caijian(View view){
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 启动系统相机
        startActivityForResult(intent, REQUEST_CAMERA_1);


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) { // 如果返回数据
            if (requestCode == REQUEST_CAMERA_1) { // 判断请求码是否为REQUEST_CAMERA,如果是代表是这个页面传过去的，需要进行获取
                Bundle bundle = data.getExtras(); // 从data中取出传递回来缩略图的信息，图片质量差，适合传递小图片
                Bitmap bitmap = (Bitmap) bundle.get("data"); // 将data中的信息流解析为Bitmap类型
                iv_photo.setImageBitmap(bitmap);// 显示图片
            } else if (requestCode == REQUEST_CAMERA_2) {
                FileInputStream fis = null;
                try {
                    fis = new FileInputStream(mFilePath); // 根据路径获取数据
                    Bitmap bitmap = BitmapFactory.decodeStream(fis);
                   iv_photo.setImageBitmap(bitmap);// 显示图片
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } finally {
                    try {
                        fis.close();// 关闭流
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
 ////