Here is a full example of building a camera app in Android that was taken from the Google tutorial.This is the complete tested camera code all in one place with no errors. There was a few errors i got from copying and pasting the code from the Google tutorial but they are fixed in this example. I also added code to display the last image taken so the user can open the picture in a image viewer. I removed excess code without testing so comment if you are having issues so I can make corrections.
This is image for an application I created so the layout below will not include the text, ads or shutter image. Check out my app in the Google Market.
CameraActivity
public class CameraActivity extends Activity{
private static Camera mCamera;
private static CameraPreview mPreview;
static final int MEDIA_TYPE_IMAGE = 1;
static Context context;
/** setting last image taken **/
static ImageView myImage;
static File imgFile = null;
int duration = Toast.LENGTH_LONG;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.camera_preview);
mCamera = getCameraInstance();
context = getApplicationContext();
// Create our Preview view and set it as the content of our activity.
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
myImage = (ImageView) findViewById(R.id.lastPic);
/** if last image is clicked it will open in an image viewer app **/
myImage.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
if(imgFile == null){
CharSequence text = "This is only an icon, take a photo";
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
else{
intent.setDataAndType(Uri.parse("file://" + imgFile.getAbsolutePath()), "image/*");
startActivity(intent);
}
return false;
}
});
/** A safe way to get an instance of the Camera object. */
public static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e){
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
public void takePhoto(View v){
mCamera.takePicture(null, null, mPicture);
}
private PictureCallback mPicture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null){
Log.d("ERROR", "Error creating media file, check storage permissions:" );
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Log.d("ERROR", "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d("ERROR", "Error accessing file: " + e.getMessage());
}
setImage();
mCamera.startPreview();
}
};
/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type){
Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
if(!isSDPresent)
{
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, "card not mounted", duration);
toast.show();
Log.d("ERROR", "Card not mounted");
}
File mediaStorageDir = new File(Environment.getExternalStorageDirectory().getPath() + "/cameraSpeed/");
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
imgFile = mediaFile;
} else {
return null;
}
return mediaFile;
}
public static void setImage(){
if(imgFile !=null){
if(imgFile.exists()){
Bitmap myBitmap = decodeSampleImage(imgFile, 100, 100); // prevents memory out of memory exception
myImage.setImageBitmap(myBitmap);
}
}
}
@Override
protected void onPause() {
super.onPause();
releaseCamera(); // release the camera immediately on pause event
}
@Override
protected void onResume() {
super.onResume();
if(mCamera == null){
mCamera = getCameraInstance();
context = getApplicationContext();
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
}
}
private void releaseCamera(){
if (mCamera != null){
mPreview.getHolder().removeCallback(mPreview);
mCamera.release();
mCamera = null;
}
}
public static Bitmap decodeSampleImage(File f, int width, int height) {
try {
System.gc(); // First of all free some memory // Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o); // The new size we want to scale to final int requiredWidth = width;
final int requiredHeight = height; // Find the scale value (as a power of 2)
int sampleScaleSize = 1;
while (o.outWidth / sampleScaleSize / 2 >= requiredWidth && o.outHeight / sampleScaleSize / 2 >= requiredHeight)
sampleScaleSize *= 2;
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = sampleScaleSize;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (Exception e) {
// Log.d(TAG, e.getMessage()); // We don't want the application to just throw an exception
}
return null;
}
}
CameraPreview
package com.nathanhaze.speedcamera;
import java.io.IOException;
import android.content.Context;
import android.graphics.Canvas;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
private GlobalVar gv = new GlobalVar();
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
// setWillNotDraw(false);
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d("ERROR", "Error setting camera preview: " + e.getMessage());
}
}
@Override
protected void onDraw(Canvas canvas) {
// Paint temp = gv.getPaint();
// temp.setTextSize(150);
// canvas.drawText(Integer.toString(gv.getSpeed()), 50, 100, gv.getPaint());
Log.w(this.getClass().getName(), "On Draw Called");
}
public void surfaceDestroyed(SurfaceHolder holder) {
// empty. Take care of releasing the Camera preview in your activity.
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d("ERROR", "Error starting camera preview: " + e.getMessage());
}
}
}
PhotoHandler
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Environment;
import android.widget.Toast;
public class PhotoHandler implements PictureCallback {
private final Context context;
public PhotoHandler(Context context) {
this.context = context;
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFileDir = getDir();
if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {
// Log.d(MakePhotoActivity.DEBUG_TAG, "Can't create directory to save image.");
Toast.makeText(context, "Can't create directory to save image.",
Toast.LENGTH_LONG).show();
return;
}
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
String date = dateFormat.format(new Date());
String photoFile = "Picture_" + date + ".jpg";
String filename = pictureFileDir.getPath() + File.separator + photoFile;
File pictureFile = new File(filename);
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
Toast.makeText(context, "New Image saved:" + photoFile,
Toast.LENGTH_LONG).show();
} catch (Exception error) {
// Log.d(MakePhotoActivity.DEBUG_TAG, "File" + filename + "not saved: "
// + error.getMessage());
Toast.makeText(context, "Image could not be saved.",
Toast.LENGTH_LONG).show();
}
}
private File getDir() {
File sdDir = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
return new File(sdDir, "CameraAPIDemo");
}
}
Manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nathanhaze.speedcamera"
android:versionCode="3"
android:versionName="1.2" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-feature android:name="android.hardware.camera" /]>
<uses-feature android:name="android.hardware.camera.autofocus" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar" >
<activity
android:name="com.nathanhaze.speedcamera.CameraActivity"
android:screenOrientation="landscape">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/camera_preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" >
</FrameLayout>
<LinearLayout
android:id="@+id/speedBackgound"
android:layout_width="fill_parent"
android:layout_height="80dp"
android:layout_gravity="bottom"
android:orientation="horizontal" >
<ImageView
android:id="@+id/lastPic"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_gravity="center"
android:layout_marginLeft="10dp"
android:layout_weight="1" />
<Button
android:layout_marginLeft="10dp"
android:id="@+id/button_capture"
android:layout_width="80dp"
android:layout_height="80dp"
android:onClick="takePhoto"
android:layout_gravity="right"/>
</LinearLayout>
</LinearLayout>
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