Camera1 use
- 5.0 is good to declare it in the configuration file, and the system above 6.0 needs to consider the problem of dynamic permissions
- Now the mobile phone version is basically above 6.0, so you need to dynamically apply for permissions
<uses-permission android:name="android.permission.CAMERA" />
Usage steps:
Call Camera.open() to open the camera, the default is rear, you can specify whether to open the front or rear according to the camera ID
Call Camera.getParameters() to get a Camera.Parameters object
Use the Camera.Parameters obtained in step 2 Object, set the parameters for taking pictures
Call Camera.setPreviewDispaly(SurfaceHolder holder), specify which SurfaceView to use to display the preview picture
Call Camera.startPreview() method to start preview framing
Call Camera.takePicture() method to take
pictures After taking pictures, call Camera. stopPreview() ends the framing preview, and then the repeat() method releases resources
XML code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:id="@+id/surface_view_camera2_activity"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ImageView
android:id="@+id/iv_show_camera2_activity"
android:layout_width="180dp"
android:layout_height="320dp"
android:layout_centerInParent="true"
android:scaleType="centerCrop"
android:visibility="gone" />
<Button
android:id="@+id/tvPermissionStatus"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="确定"
android:textSize="25sp"
android:visibility="gone" />
</RelativeLayout>Activity code:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private final int CAMERA_REQUEST_CODE = 1;
private Button tvPermissionStatus;
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private Camera camera;
private ImageView iv_show;
private int viewWidth, viewHeight;//mSurfaceView的宽和高
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
requestPermission();
}
//初始化
private void initView() {
tvPermissionStatus = findViewById(R.id.tvPermissionStatus);
iv_show = findViewById(R.id.iv_show_camera2_activity);
mSurfaceView = findViewById(R.id.surface_view_camera2_activity);
mSurfaceHolder = mSurfaceView.getHolder();
//不需要自己的缓冲区
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
//添加回调
mSurfaceHolder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
//初始化Camera
initCamera();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
//销毁，释放资源
if (camera != null) {
camera.stopPreview();
camera.release();
}
}
});
//设置点击监听
mSurfaceView.setOnClickListener(this);
tvPermissionStatus.setOnClickListener(this);
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (mSurfaceView != null) {
viewWidth = mSurfaceView.getWidth();
viewHeight = mSurfaceView.getHeight();
}
}
/**
* SurfaceHolder 回调接口的方法
*/
private void initCamera() {
//开启
camera = Camera.open();
//设置旋转角度
camera.setDisplayOrientation(90);
if (camera != null) {
try {
Camera.Parameters parameters = camera.getParameters();
//设置预览照片的大小
parameters.setPreviewFpsRange(viewWidth, viewHeight);
//设置相机预览照片帧数
parameters.setPreviewFpsRange(4, 10);
//设置图片格式
parameters.setPictureFormat(ImageFormat.JPEG);
//图片质量
parameters.set("jpeg-quality", 90);
//设置照片的大小
parameters.setPictureSize(viewWidth, viewHeight);
//通过SurfaceView显示预览
camera.setPreviewDisplay(mSurfaceHolder);
//开始预览
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 点击回调方法
*
* @param v
*/
@Override
public void onClick(View v) {
if (camera == null) {
return;
}
camera.autoFocus(autoFocusCallback);
}
/**
* 自动对焦 对焦成功后 就进行拍照
*/
Camera.AutoFocusCallback autoFocusCallback = new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (success) {
//成功
camera.takePicture(new Camera.ShutterCallback() { //按下快门
@Override
public void onShutter() {
//按下快门瞬间的操作
}
}, new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
}
}, pictureCallback);
}
}
};
Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
final Bitmap resource = BitmapFactory.decodeByteArray(data, 0, data.length);
if (resource == null) {
Toast.makeText(MainActivity.this, "拍照失败", Toast.LENGTH_SHORT).show();
}
//矩阵
final Matrix matrix = new Matrix();
matrix.setRotate(90);
final Bitmap bitmap = Bitmap.createBitmap(resource, 0, 0, resource.getWidth(), resource.getHeight(), matrix, true);
if (bitmap != null && iv_show != null && iv_show.getVisibility() == View.GONE) {
camera.stopPreview();
iv_show.setVisibility(View.VISIBLE);
mSurfaceView.setVisibility(View.GONE);
Toast.makeText(MainActivity.this, "拍照", Toast.LENGTH_SHORT).show();
iv_show.setImageBitmap(bitmap);
}
}
};
private void requestPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
// 第一次请求权限时，用户如果拒绝，下一次请求shouldShowRequestPermissionRationale()返回true
// 向用户解释为什么需要这个权限
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
new AlertDialog.Builder(this)
.setMessage("申请相机权限")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//申请相机权限
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE);
}
})
.show();
} else {
//申请相机权限
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE);
}
} else {
tvPermissionStatus.setTextColor(Color.GREEN);
tvPermissionStatus.setText("相机权限已申请");
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == CAMERA_REQUEST_CODE) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
tvPermissionStatus.setTextColor(Color.GREEN);
tvPermissionStatus.setText("相机权限已申请");
} else {
//用户勾选了不再询问
//提示用户手动打开权限
if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
Toast.makeText(this, "相机权限已被禁止", Toast.LENGTH_SHORT).show();
}
}
}
}
}