很多app都要求自定义一个相机，类似违章查询拍照，美图相机之类的应用都要求自定义相机，网上的例子大多数我也看过，很多例子是有坑的，存在各种各样的问题，常见的就是问题就是适配性很差，这里我分享一下我做的一个自定义相机，算是浅度实现吧，实现了拍照和保存和添加水印的功能，做过测试，三星S7，华为荣耀7，oppoR9s，vivoY66都可以通过测试

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好了下面直接上代码吧，关于坑点，会在代码中注释：

第一步，配置权限：

第二步，重写一个surfaceview，并在onSrfacexxxx三个方法中，里面把预览及相机初始化的一些工作做了

public void surfaceCreated(SurfaceHolder holder) {

Log.d(TAG, "surfaceCreated() is called");

try {

mCamera = Camera.open(0);

mCamera.setDisplayOrientation(90);

mCamera.setPreviewDisplay(holder);

mCamera.startPreview();

} catch (IOException e) {

Log.d(TAG, "Error setting camera preview: " + e.getMessage());

}

}

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

Log.d(TAG, "surfaceChanged() is called");

try {

mCamera.autoFocus(new Camera.AutoFocusCallback() {

@Override

public void onAutoFocus(boolean success, Camera camera) {

isSuccess = success;

initCamera();

mCamera.cancelAutoFocus();

mCamera.startPreview();

}

});

} catch (Exception e) {

Log.d(TAG, "Error starting camera preview: " + e.getMessage());

}

}

private void initCamera() {

mParameters = mCamera.getParameters();

mParameters.setPictureFormat(ImageFormat.JPEG);

List pictureSizes = mParameters.getSupportedPictureSizes();

Camera.Size picSize = null;

WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);

Display display = wm.getDefaultDisplay();

int screenWidth = display.getWidth();

int screenHeight = display.getHeight();

//相机支持的拍摄图片尺寸，拍照图片尺寸小于等于屏幕尺寸，实现适配

if (pictureSizes.size() > 1) {

for (Camera.Size size2 : pictureSizes) {

System.out.println("initCamera:" + size2.width + size2.height);

if (size2.width * size2.height <= screenWidth * screenHeight) {

if (picSize == null) {

picSize = size2;

} else {

if ((size2.width * size2.height) > (picSize.width * picSize.height)) {

picSize = size2;

}

}

}

}

} else {

picSize = pictureSizes.get(0);

}

mParameters.setPictureSize(picSize.width, picSize.height);

//设置尺寸以适配所有机型，图片尺寸小于等于屏幕尺寸，部分机型崩溃的问题得到了解决

mParameters.setJpegQuality(99); // 设置照片质量

List aa = mParameters.getSupportedFocusModes();

//设置对焦模式，低端机型可能不支持快速对焦，当然现在大部分机型支持，但是也得适配啊

if (aa.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {

mParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);//快速对焦

} else {

mParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);

}

try {

mCamera.setParameters(mParameters);

mCamera.startPreview();

} catch (Exception e) {

}

}

public void surfaceDestroyed(SurfaceHolder holder) {

if (mCamera != null) {

mCamera.setPreviewCallback(null);

mCamera.stopPreview();

mCamera.release();

mCamera = null;

}

Log.d(TAG, "surfaceDestroyed() is called");

}

//拍照

public void takePicture(Camera.PictureCallback imageCallback) {

Log.d(TAG, "takePicture: " + isSuccess);

if (isSuccess) {

mCamera.takePicture(null, null, imageCallback);

} else {//如果不成功则重试对焦，否则拍出的照片可能糊

initCamera();

mCamera.cancelAutoFocus();

mCamera.takePicture(null, null, imageCallback);

}

}

}

第三步，在Activity中去实现拍照的操作：

//绑定surfaceView

FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);

mCameraSurPreview = new SurfacePreview(this);

preview.addView(mCameraSurPreview);

//拍照

mCameraSurPreview.takePicture(this);