Can I get Some Help With Andriod Application...Eclipse Create a mini application

Question

Can I get Some Help With Andriod Application...Eclipse

Create a mini application that takes either an image file or a snap from the camera and display all the Meta-data information alongside the image. Make sure you include the image's Latitude and Longitude values. This metadata is called the EXIF data. For more information on EXIF data please reference the link below.

http://developer.android.com/reference/android/media/ExifInterface.html

As a reminder, when taking an image with the camera, you may use an ImageButton, which when pressed calls the Camera app, takes the picture, and then displays the image as the button's background.

Explanation / Answer

eclipse 4.2 juno

open eclipse and go to file -->new -->project

Go to android application

specify the name of the application

next

after that create activity should be checked

choose the location

next

choose your icon for your app

next

create activity

blank activity

next

next

finish

you can see the structure of the program

create the android program for camera app

by creating a xml file

<?xml version="1.0" encoding="utf-8"?>
02
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:orientation="horizontal" >
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<LinearLayout
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android:id="@+id/camera_preview"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:layout_weight="1"
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android:orientation="horizontal"/>
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<LinearLayout
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android:id="@+id/buttonsLayout"
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android:layout_width="wrap_content"
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android:layout_height="match_parent"
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android:layout_gravity="center"
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android:orientation="vertical" >
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<Button
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android:id="@+id/button_ChangeCamera"
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android:layout_width="72dp"
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android:layout_height="wrap_content"
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android:text="Switch Camera"
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android:layout_marginTop="30dp"/>
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<Button
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android:id="@+id/button_capture"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Capture"
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android:layout_marginTop="100dp"/>
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</LinearLayout>
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</LinearLayout>

After that creating a main program

001
package com.javacodegeeks.androidcameraexample;
002

003
import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import android.app.Activity;
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import android.content.Context;
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import android.content.pm.PackageManager;
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import android.hardware.Camera;
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import android.hardware.Camera.CameraInfo;
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import android.hardware.Camera.PictureCallback;
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import android.os.Bundle;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.WindowManager;
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import android.widget.Button;
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import android.widget.LinearLayout;
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import android.widget.Toast;
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024
public class AndroidCameraExample extends Activity {
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private Camera mCamera;
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private CameraPreview mPreview;
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private PictureCallback mPicture;
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private Button capture, switchCamera;
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private Context myContext;
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private LinearLayout cameraPreview;
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private boolean cameraFront = false;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
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myContext = this;
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initialize();
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}
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private int findFrontFacingCamera() {
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int cameraId = -1;
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// Search for the front facing camera
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int numberOfCameras = Camera.getNumberOfCameras();
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for (int i = 0; i < numberOfCameras; i++) {
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CameraInfo info = new CameraInfo();
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Camera.getCameraInfo(i, info);
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if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
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cameraId = i;
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cameraFront = true;
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break;
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}
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}
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return cameraId;
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}
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private int findBackFacingCamera() {
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int cameraId = -1;
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//Search for the back facing camera
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//get the number of cameras
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int numberOfCameras = Camera.getNumberOfCameras();
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//for every camera check
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for (int i = 0; i < numberOfCameras; i++) {
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CameraInfo info = new CameraInfo();
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Camera.getCameraInfo(i, info);
067
if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
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cameraId = i;
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cameraFront = false;
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break;
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}
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}
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return cameraId;
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}
075

076
public void onResume() {
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super.onResume();
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if (!hasCamera(myContext)) {
079
Toast toast = Toast.makeText(myContext, "Sorry, your phone does not have a camera!", Toast.LENGTH_LONG);
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toast.show();
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finish();
082
}
083
if (mCamera == null) {
084
//if the front facing camera does not exist
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if (findFrontFacingCamera() 1) {
086
//release the old camera instance
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//switch camera, from the front and the back and vice versa
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089
releaseCamera();
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chooseCamera();
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} else {
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Toast toast = Toast.makeText(myContext, "Sorry, your phone has only one camera!", Toast.LENGTH_LONG);
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toast.show();
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}
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}
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};
097

098
public void chooseCamera() {
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//if the camera preview is the front
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if (cameraFront) {
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int cameraId = findBackFacingCamera();
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if (cameraId >= 0) {
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//open the backFacingCamera
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//set a picture callback
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//refresh the preview
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mCamera = Camera.open(cameraId);
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mPicture = getPictureCallback();
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mPreview.refreshCamera(mCamera);
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}
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} else {
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int cameraId = findFrontFacingCamera();
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if (cameraId >= 0) {
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//open the backFacingCamera
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//set a picture callback
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//refresh the preview
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mCamera = Camera.open(cameraId);
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mPicture = getPictureCallback();
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mPreview.refreshCamera(mCamera);
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}
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}
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}
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125
@Override
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protected void onPause() {
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super.onPause();
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//when on Pause, release camera in order to be used from other applications
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releaseCamera();
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}
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132
private boolean hasCamera(Context context) {
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//check if the device has camera
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if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
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return true;
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} else {
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return false;
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}
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}
140

141
private PictureCallback getPictureCallback() {
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PictureCallback picture = new PictureCallback() {
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@Override
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public void onPictureTaken(byte[] data, Camera camera) {
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//make a new picture file
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File pictureFile = getOutputMediaFile();
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149
if (pictureFile == null) {
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return;
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}
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try {
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//write the file
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FileOutputStream fos = new FileOutputStream(pictureFile);
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fos.write(data);
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fos.close();
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Toast toast = Toast.makeText(myContext, "Picture saved: " + pictureFile.getName(), Toast.LENGTH_LONG);
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toast.show();
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160
} catch (FileNotFoundException e) {
161
} catch (IOException e) {
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}
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//refresh camera to continue preview
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mPreview.refreshCamera(mCamera);
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}
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};
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return picture;
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}
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OnClickListener captrureListener = new OnClickListener() {
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@Override
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public void onClick(View v) {
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mCamera.takePicture(null, null, mPicture);
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}
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};
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178
//make picture and save to a folder
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private static File getOutputMediaFile() {
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//make a new file directory inside the "sdcard" folder
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File mediaStorageDir = new File("/sdcard/", "JCG Camera");
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//if this "JCGCamera folder does not exist
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if (!mediaStorageDir.exists()) {
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//if you cannot make this folder return
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if (!mediaStorageDir.mkdirs()) {
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return null;
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}
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}
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//take the current timeStamp
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String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
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File mediaFile;
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//and make a media file:
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mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
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return mediaFile;
198
}
199

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private void releaseCamera() {
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// stop and release camera
202
if (mCamera != null) {
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mCamera.release();
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mCamera = null;
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}
206
}
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}

after that create a android manifest

because it needs hardware camera also

<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.javacodegeeks.androidcameraexample"
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android:versionCode="1"
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android:versionName="1.1" >
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<uses-sdk
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android:minSdkVersion="10"
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android:targetSdkVersion="19" />
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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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<uses-permission android:name="android.permission.CAMERA" />
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<uses-feature android:name="android.hardware.camera" />
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<uses-feature android:name="android.hardware.camera.autofocus" />
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<uses-feature android:name="android.hardware.camera.front" android:required="false" />
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<application
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android:icon="@drawable/ic_launcher"
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android:label="@string/app_name" >
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<activity
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android:name=".AndroidCameraExample"
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android:label="@string/app_name"
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android:screenOrientation="landscape"
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android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

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