使用自定義Camera實現簡單拍照功能
阿新 • • 發佈：2019-02-11
閒來無事，就把之前用自定義Camera實現的簡單拍照功能記錄一下。
Camera類在5.0以後不推薦使用了，取而代之的是android.hardware.camera2包下的類，本文使用Camera。
我們首先自定義一個View去繼承SurfaceView:
public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Camera.AutoFocusCallback {
private SurfaceHolder mHolder;
private Camera mCamera;
private 程式碼沒什麼難度，在View建立的時候完成Camera的初始化，然後對Camera進行引數的設定（圖片尺寸，質量之類的），最後別忘了在View銷燬的時候對資源進行釋放。
控制元件定義完了之後我們就要去使用它，在佈局檔案中新增就OK：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<com.padoon.cameratest.CameraSurfaceView
android:id="@+id/sv_camera"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="4"/>
<ImageView
android:id="@+id/img_take_photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_gravity="bottom"
android:layout_marginBottom="10dp"
android:layout_marginRight="10dp"
android:src="@mipmap/icon_camera"/>
</RelativeLayout>然後在Activity中去完成拍照功能：
public class CameraActivity extends AppCompatActivity {
private boolean isClick = true;
private static final String PATH_IMAGES = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "easy_check";
private CameraSurfaceView mCameraSurfaceView;
//拍照快門的回撥
private Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback() {
@Override
public void onShutter() {
}
};
//拍照完成之後返回原始資料的回撥
private Camera.PictureCallback rawPictureCallback = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
}
};
//拍照完成之後返回壓縮資料的回撥
private Camera.PictureCallback jpegPictureCallback = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
mCameraSurfaceView.startPreview();
saveFile(data);
Toast.makeText(CameraActivity.this, "拍照成功", Toast.LENGTH_SHORT).show();
isClick = true;
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView img_take_photo = (ImageView) findViewById(R.id.img_take_photo);
mCameraSurfaceView = (CameraSurfaceView) findViewById(R.id.sv_camera);
img_take_photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
takePhoto();
}
});
}
public void takePhoto() {
if (isClick) {
isClick = false;
mCameraSurfaceView.takePicture(mShutterCallback, rawPictureCallback, jpegPictureCallback);
}
}
//儲存圖片到硬碟
public void saveFile(byte[] data) {
String fileName = UUID.randomUUID().toString() + ".jpg";
FileOutputStream outputStream = null;
try {
File file = new File(PATH_IMAGES);
if (!file.exists()) {
file.mkdirs();
}
outputStream = new FileOutputStream(PATH_IMAGES + File.separator + fileName);
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
bufferedOutputStream.write(data, 0, data.length);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}最後記得新增拍照跟磁碟操作許可權：
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>到這一個非常簡單的拍照Demo就完成了，只能當做Demo使用，離開發正式使用還有一段的距離，再次特地記錄一下。