- Set Preview Callback
camera.setPreviewCallback(new Camera.PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera) {
...
}
}
...
}
}
- Compress Raw Data to Jpeg Format
Camera.Parameters parameters = camera.getParameters();
Size size = parameters.getPreviewSize();
YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);
Rect rect = new Rect();
rect.bottom = size.height;
rect.top = 0;
rect.left = 0;
rect.right = size.width;
image.compressToJpeg(rect, 100, compressedData);
- Setup Camera Surface
camerasurface = new CameraSurface(this);
cameraholder.addView(camerasurface, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
- Sample Code for Android Taking Snapshot
package zachary.samples.camera;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import
android.view.View.OnClickListener;
import
android.view.ViewGroup.LayoutParams;
import android.view.Window;
import
android.view.WindowManager;
import
android.widget.FrameLayout;
public class
TakingShotActivity extends Activity implements OnClickListener {
private final String mTAG =
"TakingShotActivity";
private FrameLayout cameraholder = null;
private CameraSurface camerasurface =
null;
@Override
public void onCreate(Bundle
savedInstanceState) {
Log.i(mTAG,
"onCreate()");
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
cameraholder =
(FrameLayout)findViewById(R.id.camera_preview);
cameraholder.setOnClickListener(this);
setup();
}
@Override
protected void onDestroy() {
Log.i(mTAG,
"onDestroy()");
camerasurface.surfaceDestroyed(cameraholder);
camerasurface
= null;
cameraholder.removeAllViews();
cameraholder
= null;
super.onDestroy();
}
private void setup() {
Log.i(mTAG,
"setup()");
camerasurface = new
CameraSurface(this);
cameraholder.addView(camerasurface, new
LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
}
@Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.camera_preview: {
camerasurface.takePicture();
break;
}};
}
}
package
zachary.samples.camera;
import
java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import
android.content.Context;
import
android.graphics.ImageFormat;
import
android.graphics.Rect;
import
android.graphics.YuvImage;
import
android.hardware.Camera;
import
android.hardware.Camera.AutoFocusCallback;
import
android.hardware.Camera.CameraInfo;
import
android.hardware.Camera.Size;
import android.os.Build;
import
android.util.AttributeSet;
import android.util.Log;
import
android.view.SurfaceHolder;
import android.view.SurfaceView;
import
android.widget.FrameLayout;
public class CameraSurface
extends SurfaceView implements SurfaceHolder.Callback {
private final String mTAG =
"CameraSurface";
private Camera camera = null;
private SurfaceHolder holder = null;
private int cameraOrientation = 0;
private boolean previewing = false;
private boolean takeShot = false;
public CameraSurface(Context context,
AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initialize(context);
}
public CameraSurface(Context context) {
super(context);
initialize(context);
}
public CameraSurface(Context context,
AttributeSet attrs) {
super(context, attrs);
initialize(context);
}
public void startPreview() {
Log.i(mTAG,
"startPreview()");
camera.startPreview();
}
public void stopPreview() {
Log.i(mTAG,
"stopPreview()");
camera.stopPreview();
}
public void takePicture() {
Log.i(mTAG,
"takePicture()");
camera.autoFocus(new
AutoFocusCallback() {
@Override
public void onAutoFocus(boolean
success, Camera camera) {
Log.i(mTAG,
"onAutoFocus()");
if
(success) {
takeShot = true;
}
}
});
}
@Override
public void surfaceChanged(SurfaceHolder
holder, int format, int width,int height) {
Log.i(mTAG,
"surfaceChanged()");
if
(previewing) {
if
(camera != null)
camera.stopPreview();
previewing
= false;
}
if (camera != null) {
camera.startPreview();
camera.setPreviewCallback(new
Camera.PreviewCallback() {
public void onPreviewFrame(byte[] data,
Camera camera) {
Log.d(mTAG,
"onPreviewFrame called at: " + System.currentTimeMillis());
CameraSurface.this.invalidate();
if (takeShot) {
try {
String file;
if
(Build.BRAND.equalsIgnoreCase("samsung"))
file =
String.format(getContext().getExternalFilesDir(null).getPath().substring(4) +
"/%d.jpg", System.currentTimeMillis());
else if
(Build.BRAND.equalsIgnoreCase("htc_asia_tw"))
file =
String.format(getContext().getExternalFilesDir(null).getPath().toString() +
"/%d.jpg", System.currentTimeMillis());
else
file =
String.format(getContext().getExternalFilesDir(null).getPath().toString() +
"/%d.jpg", System.currentTimeMillis());
FileOutputStream
fileoutputstream = new FileOutputStream(file);
Camera.Parameters
parameters = camera.getParameters();
Size size =
parameters.getPreviewSize();
YuvImage image =
new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);
Rect rect = new
Rect();
rect.bottom =
size.height;
rect.top = 0;
rect.left = 0;
rect.right =
size.width;
ByteArrayOutputStream compressedData = new ByteArrayOutputStream();
image.compressToJpeg(rect, 100, compressedData);
fileoutputstream.write(compressedData.toByteArray());
fileoutputstream.close();
}
catch(Exception e) {
e.printStackTrace();
}
takeShot = false;
}
}
});
previewing = true;
}
}
@Override
public void surfaceCreated(SurfaceHolder
holder) {
Log.i(mTAG,
"surfaceCreated()");
CameraInfo
camerainfo = new Camera.CameraInfo();
for (int index = 0; index <
Camera.getNumberOfCameras(); index++) {
Camera.getCameraInfo(index,
camerainfo);
if
(camerainfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
try
{
camera
= Camera.open(index);
}
catch (RuntimeException e) {
e.printStackTrace();
}
cameraOrientation
= (camerainfo.orientation + 0) % 360;
cameraOrientation
= (360 - cameraOrientation);
camera.setDisplayOrientation(cameraOrientation);
Camera.Parameters
cameraparameters = camera.getParameters();
cameraparameters.setRotation(camerainfo.orientation);
camera.setParameters(cameraparameters);
}
}
try
{
camera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
public void surfaceDestroyed(FrameLayout
cameraholder) {
Log.i(mTAG,
"surfaceDestroy(FrameLayout)");
if
(camera != null) {
camera.setPreviewCallback(null);
camera.stopPreview();
camera.release();
camera = null;
}
previewing = false;
}
private void initialize(Context context) {
Log.i(mTAG,
"initialize()");
holder = getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
Log.i(mTAG,
"surfaceDestroy(SurfaceHolder)");
}
}
