預覽流程： Camera.open-->camera.setPreviewDisplay->camera.startPreview

拍照：camera.takePicture-->保存圖片-->camera.startPreview

public class MainActivity extends Activity {

String TAG="Camera_1111";

SurfaceView surfaceView;

SurfaceHolder surfaceHolder;

Camera camera;

int cameraId=0;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

Log.e(TAG,"---------onCreate---------");

setContentView(R.layout.activity_main);

surfaceView=(SurfaceView) findViewById(R.id.svCamera);

surfaceHolder=surfaceView.getHolder();

surfaceHolder.addCallback(new SurfaceHolder.Callback() {

@Override

public void surfaceCreated(SurfaceHolder holder) {

camera=Camera.open(cameraId);

try {

camera.setPreviewDisplay(surfaceHolder);

} catch (IOException e) {

e.printStackTrace();

}

setCameraDisplayOrientation();

// configParameters();

camera.startPreview();

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

Log.e(TAG,"---------surfaceDestroyed---------");

camera.release();

}

});

}

//配置預覽參數

private void configParameters(){

Camera.Parameters param = camera.getParameters();

param.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);

param.setPictureFormat(ImageFormat.JPEG);

param.setJpegQuality(100);

param.setPreviewSize(param.getSupportedPreviewSizes().get(0).width,param.getSupportedPreviewSizes().get(0).height);

Log.e(TAG,"param.getSupportedPreviewSizes()"+param.getSupportedPreviewSizes().get(0).width+" X "+param.getSupportedPreviewSizes().get(0).height);

param.setPictureSize(param.getSupportedPictureSizes().get(0).width,param.getSupportedPictureSizes().get(0).height);

camera.setParameters(param);

}

//旋轉預覽角度

private void setCameraDisplayOrientation() {

android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();

android.hardware.Camera.getCameraInfo(cameraId, info);

int rotation = getWindowManager().getDefaultDisplay().getRotation();

int degrees = 0;

switch (rotation) {

case Surface.ROTATION_0: degrees = 0; break;

case Surface.ROTATION_90: degrees = 90; break;

case Surface.ROTATION_180: degrees = 180; break;

case Surface.ROTATION_270: degrees = 270; break;

}

int result;

if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

result = (info.orientation + degrees) % 360;

result = (360 - result) % 360; // compensate the mirror

} else { // back-facing

result = (info.orientation - degrees) % 360;

}

Log.e(TAG,"rotation ="+result);

//旋轉預覽的角度

camera.setDisplayOrientation(result);

//-----------------------------

//旋轉生成的照片角度

Camera.Parameters param = camera.getParameters();

param.setRotation(result);

camera.setParameters(param);

}

public void photo(View view){

camera.takePicture(null,null,new Camera.PictureCallback(){

@Override

public void onPictureTaken(byte[] data, Camera camera) {

savePicture(data);

camera.startPreview();

}

});

}

private void savePicture(byte[] data) {

String root = Environment.getExternalStorageDirectory().getPath();

File objPic = new File(root,"test.jpg");

BufferedOutputStream bos = null;

try {

bos = new BufferedOutputStream(new FileOutputStream(objPic));

bos.write(data);

bos.flush();

Toast.makeText(this,"拍照成功",Toast.LENGTH_SHORT).show();

} catch (IOException e) {

e.printStackTrace();

}finally {

if(bos!=null){

try {

bos.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

}

public classMainActivity extendsActivity {

String TAG="Camera_1111";

SurfaceView surfaceView;

SurfaceHolder surfaceHolder;

Camera camera;

intcameraId=0;

@Overrideprotected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

Log.e(TAG,"---------onCreate---------");

setContentView(R.layout.activity_main);

surfaceView=(SurfaceView) findViewById(R.id.svCamera);

surfaceHolder=surfaceView.getHolder();

surfaceHolder.addCallback(newSurfaceHolder.Callback() {

@Overridepublic voidsurfaceCreated(SurfaceHolder holder) {

camera=Camera.open(cameraId);

try{

camera.setPreviewDisplay(surfaceHolder);

} catch(IOException e) {

e.printStackTrace();

}

setCameraDisplayOrientation();

// configParameters();camera.startPreview();

}

@Overridepublic voidsurfaceChanged(SurfaceHolder holder, intformat, intwidth, intheight) {

}

@Overridepublic voidsurfaceDestroyed(SurfaceHolder holder) {

Log.e(TAG,"---------surfaceDestroyed---------");

camera.release();

}

});

}

//配置預覽參數private voidconfigParameters(){

Camera.Parameters param = camera.getParameters();

param.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);

param.setPictureFormat(ImageFormat.JPEG);

param.setJpegQuality(100);

param.setPreviewSize(param.getSupportedPreviewSizes().get(0).width,param.getSupportedPreviewSizes().get(0).height);

Log.e(TAG,"param.getSupportedPreviewSizes()"+param.getSupportedPreviewSizes().get(0).width+" X "+param.getSupportedPreviewSizes().get(0).height);

param.setPictureSize(param.getSupportedPictureSizes().get(0).width,param.getSupportedPictureSizes().get(0).height);

camera.setParameters(param);

}

//旋轉預覽角度private voidsetCameraDisplayOrientation() {

android.hardware.Camera.CameraInfo info = newandroid.hardware.Camera.CameraInfo();

android.hardware.Camera.getCameraInfo(cameraId, info);

introtation = getWindowManager().getDefaultDisplay().getRotation();

intdegrees = 0;

switch(rotation) {

caseSurface.ROTATION_0: degrees = 0; break;

caseSurface.ROTATION_90: degrees = 90; break;

caseSurface.ROTATION_180: degrees = 180; break;

caseSurface.ROTATION_270: degrees = 270; break;

}

intresult;

if(info.facing== Camera.CameraInfo.CAMERA_FACING_FRONT) {

result = (info.orientation+ degrees) % 360;

result = (360- result) % 360; // compensate the mirror} else{ // back-facingresult = (info.orientation- degrees) % 360;

}

Log.e(TAG,"rotation ="+result);

//旋轉預覽的角度camera.setDisplayOrientation(result);

//-----------------------------//旋轉生成的照片角度Camera.Parameters param = camera.getParameters();

param.setRotation(result);

camera.setParameters(param);

}

public voidphoto(View view){

camera.takePicture(null,null,newCamera.PictureCallback(){

@Overridepublic voidonPictureTaken(byte[] data, Camera camera) {

savePicture(data);

camera.startPreview();

}

});

}

private voidsavePicture(byte[] data) {

String root = Environment.getExternalStorageDirectory().getPath();

File objPic = newFile(root,"test.jpg");

BufferedOutputStream bos = null;

try{

bos = newBufferedOutputStream(newFileOutputStream(objPic));

bos.write(data);

bos.flush();

Toast.makeText(this,"拍照成功",Toast.LENGTH_SHORT).show();

} catch(IOException e) {

e.printStackTrace();

}finally{

if(bos!=null){

try{

bos.close();

} catch(IOException e) {

e.printStackTrace();

}

}

}

}

}

原文：https://www.cnblogs.com/jtzp007/p/11650575.html

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