Android 默认情况下打开前摄像头
我对android非常陌生，出于某种原因，我必须实现一个代码，默认情况下打开前摄像头而不是后摄像头。我的最小SDK是API 9，目标SDK是API 21。我有一个PicturePlugin.Java文件，代码是：Android 默认情况下打开前摄像头,android,plugins,front-camera,Android,Plugins,Front Camera,我对android非常陌生，出于某种原因，我必须实现一个代码，默认情况下打开前摄像头而不是后摄像头。我的最小SDK是API 9，目标SDK是API 21。我有一个PicturePlugin.Java文件，代码是： public class PicturePlugin extends CordovaPlugin { private String callback="data"; private int IMAGE_TAKEN=1; private CallbackConte
public class PicturePlugin extends CordovaPlugin
{
private String callback="data";
private int IMAGE_TAKEN=1;
private CallbackContext callbackContext;
private String TAG="FilePlugin";
private int imageWidth,imageHeight;
private String imagePath;
private File destImageFile;
private String mode = "BACK";
private static String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
CameraManager manager;
private static final String TAG1 = null ;
public boolean execute(String action, JSONArray args, CallbackContext callbackContext)
{
this.callbackContext = callbackContext;
this.cordova.getActivity().getApplicationContext().getPackageName();
try
{
JSONObject object=(JSONObject) args.get(0);
imageWidth=object.getInt("targetWidth");
imageHeight=object.getInt("targetHeight");
if(object.has("mode")){
if(object.getString("mode").equals("FRONT")){
mode = "FRONT";
openFrontFacingCamera();
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra("android.intent.extras.CAMERA_FACING", android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT);
}
}else{
mode = "BACK";
}
Intent camera=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
imagePath = getCapturedImageExternal();
destImageFile = new File(imagePath);
camera.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(destImageFile));
this.cordova.setActivityResultCallback(PicturePlugin.this);
cordova.getActivity().startActivityForResult(camera,IMAGE_TAKEN);
}
catch (Exception e)
{
Log.i(TAG, "Exception "+e.getMessage());
callbackContext.error("failed");
}
return true;
}
private Camera openFrontFacingCamera()
{
int cameraCount = 0;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for ( int camId = 0; camId < cameraCount; camId++ ) {
Camera.getCameraInfo( camId, cameraInfo );
if ( cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT ) {
try {
cam = Camera.open( camId );
} catch (RuntimeException e) {
Log.e(TAG1, "Camera failed to open: " + e.getLocalizedMessage());
}
}
}
return cam;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent)
{
if (requestCode == IMAGE_TAKEN && resultCode == Activity.RESULT_OK) {
File finalFile = null;
File fileTobeDeleted = null;
Bitmap photo = null;
File sd = new File(Environment.getExternalStorageDirectory(),
Constants.GOBIZMO_IMAGE_DIR);
String destinationImagePath = File.separator
+ Constants.TEMP_CAMERA_IMAGE + ".JPEG";
File destination = new File(sd, destinationImagePath);
sd.setWritable(true);
try {
String encoded;
imagePath = destImageFile.getAbsolutePath();
finalFile = new File(imagePath);
fileTobeDeleted = new File(imagePath);
int angle = getAngle(finalFile.getAbsolutePath());
if (finalFile.exists()) {
photo = BitmapFactory.decodeFile(finalFile
.getAbsolutePath());
Matrix matrix = new Matrix();
matrix.postRotate(angle);
Bitmap scaledBitmap = Bitmap.createScaledBitmap(photo, imageWidth, imageHeight, true);
photo = Bitmap.createBitmap(scaledBitmap, 0, 0, imageWidth, imageHeight, matrix, true);
// //////New orientation fix for all
// devices///////////////////////
try {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);
Log.e("base 64 image", encoded);
JSONObject object = new JSONObject();
object.put(callback, encoded);
finalFile.delete();
fileTobeDeleted.delete();
//imagePath = destination.getPath();
if(new File(imagePath).exists()){
new File(imagePath).delete();
}
callbackContext.success(encoded);
} catch (Exception e) {
e.printStackTrace();
Log.i(TAG, "onActivityResult " + e.getMessage());
finalFile.delete();
fileTobeDeleted.delete();
if(new File(imagePath).exists()){
new File(imagePath).delete();
}
callbackContext.error("failed");
}
}
} catch (Exception exp) {
exp.printStackTrace();
Log.i(TAG, "onActivityResult " + exp.getMessage());
try {
finalFile.delete();
fileTobeDeleted.delete();
imagePath = destination.getPath();
if(new File(imagePath).exists()){
new File(imagePath).delete();
}
callbackContext.error("failed");
}catch(Exception innerexception){
innerexception.printStackTrace();
}
}
}
}
public Uri getImageUri(Context inContext, Bitmap inImage)
{
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
public String getRealPathFromURI(Uri uri)
{
Cursor cursor = cordova.getActivity().getContentResolver().query(uri, null, null, null, null);
cursor.moveToFirst();
int idx = cursor.getColumnIndex(Images.ImageColumns.DATA);
return cursor.getString(idx);
}
public static String getCapturedImageExternal() {
// External sdcard location
File mediaStorageDir = new File(
android.os.Environment.getExternalStorageDirectory(),
"Gobizmo image");
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()){
mediaStorageDir.mkdirs();
}
if (!mediaStorageDir.exists() && !mediaStorageDir.mkdirs()) {
Log.d(Constants.GOBIZMO_IMAGE_DIR, "Oops! Failed create "
+ Constants.GOBIZMO_IMAGE_DIR + " directory");
return null;
}
// Create a timestamp
return mediaStorageDir.getPath() + File.separator + Constants.TEMP_CAMERA_IMAGE
+ ".JPEG";
}
public static String getRealPathFromURI(Context context, Uri contentUri) {
String filepath = "";
String uriPath = contentUri.toString();
// Handle local file and remove url encoding
if (uriPath.startsWith("file://")) {
filepath = uriPath.replace("file://", "");
try {
return URLDecoder.decode(filepath, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
try {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(contentUri,
projection, null, null, null);
if (cursor != null && cursor.getCount() != 0) {
int column_index = cursor
.getColumnIndex(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
filepath = cursor.getString(column_index);
}
} catch (Exception e) {
Log.e("Path Error", e.toString());
}
return filepath;
}
private int getAngle(String path)
{
int angle=0;
try
{
ExifInterface ei = new ExifInterface(path);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
Log.i(TAG, "getAngle "+orientation);
switch(orientation)
{
case ExifInterface.ORIENTATION_ROTATE_90:
angle=90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
angle=180;
break;
case ExifInterface.ORIENTATION_ROTATE_270 :
angle=270;
default:
angle=0;
}
}
catch(Exception ex)
{
Log.i("getAngle", "getAngle :: "+ex.getMessage());
}
return angle;
}
}
公共类PicturePlugin扩展了CordovaPlugin
{
私有字符串callback=“data”；
私人int图像_拍摄=1；
私有CallbackContext CallbackContext；
私有字符串TAG=“FilePlugin”；
私有int-imageWidth、imageHeight；
私有字符串路径；
私有文件；
私有字符串模式=“返回”；
私有静态字符串时间戳=新的SimpleDataFormat（“yyyyMMdd_HHmmss”，
Locale.getDefault（））.format（新日期（））；
摄像管理员；
私有静态最终字符串TAG1=null；
公共布尔执行（字符串操作、JSONArray参数、CallbackContext CallbackContext）
{
this.callbackContext=callbackContext；
this.cordova.getActivity（）.getApplicationContext（）.getPackageName（）；
尝试
{
JSONObject对象=（JSONObject）args.get（0）；
imageWidth=object.getInt（“targetWidth”）；
imageHeight=object.getInt（“targetHeight”）；
if（object.has（“mode”））{
if（object.getString（“mode”）.equals（“FRONT”））{
mode=“FRONT”；
打开正面摄像头（）；
意向意向=新意向（MediaStore.ACTION\u IMAGE\u CAPTURE）；
intent.putExtra（“android.intent.extras.CAMERA_-FACING”，android.hardware.CAMERA.CameraInfo.CAMERA_-FACING_-FRONT”）；
}
}否则{
mode=“后退”；
}
意向照相机=新意向（MediaStore.ACTION\u IMAGE\u CAPTURE）；
imagePath=getCapturedImageExternal（）；
DestinmageFile=新文件（imagePath）；
camera.putExtra（MediaStore.EXTRA_输出，
fromFile（destImageFile））；
this.cordova.setActivityResultCallback（PicturePlugin.this）；
cordova.getActivity（）.startActivityForResult（照相机，拍摄的图像）；
}
捕获（例外e）
{
Log.i（标记“Exception”+e.getMessage（））；
callbackContext.error（“失败”）；
}
返回true；
}
私人摄像机openFrontFacingCamera（）
{
int cameraCount=0；
摄像机摄像机=null；
Camera.CameraInfo CameraInfo=新的Camera.CameraInfo（）；
cameraCount=Camera.getNumberOfCameras（）；
对于（int-camId=0；camIdobject.getString("mode").equals("FRONT")
Activity activity = getActivity();
CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
try {
for (String cameraId : manager.getCameraIdList()) {
CameraCharacteristics characteristics
= manager.getCameraCharacteristics(cameraId);
// Choose front or back lens
Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);
if (facing != null && facing == CameraCharacteristics.LENS_FACING_BACK) {
continue;
}
private Camera openFrontFacingCameraGingerbread() {
int cameraCount = 0;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for (int camIdx = 0; camIdx<cameraCount; camIdx++) {
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
try {
cam = Camera.open(camIdx);
} catch (RuntimeException e) {
Log.e("Your_TAG", "Camera failed to open: " + e.getLocalizedMessage());
}
}
}
return cam;
}
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" android:required="false" />
<uses-feature android:name="android.hardware.camera.front" android:required="false" />
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.UUID;
import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaPlugin;
import org.json.JSONArray;
import org.json.JSONObject;
import org.maxmobility.util.Constants;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.hardware.Camera;
import android.hardware.camera2.CameraManager;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.MediaStore.Images;
import android.util.Base64;
import android.util.Log;
import android.view.SurfaceHolder;
public class PicturePlugin extends CordovaPlugin
{
private String callback="data";
private int IMAGE_TAKEN=1;
private CallbackContext callbackContext;
private String TAG="FilePlugin";
private int imageWidth,imageHeight;
private String imagePath;
private File destImageFile;
private String mode = "BACK";
private static String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
static Camera camera = null;
private static final String TAG1 = null ;
public boolean execute(String action, JSONArray args, CallbackContext callbackContext)
{
this.callbackContext = callbackContext;
this.cordova.getActivity().getApplicationContext().getPackageName();
try
{
JSONObject object=(JSONObject) args.get(0);
imageWidth=object.getInt("targetWidth");
imageHeight=object.getInt("targetHeight");
//checking whether json object has "mode" or not
if(object.has("mode"))
{
//if json object has "mode" and that is "FRONT"
if(object.getString("mode").equals("FRONT"))
{
mode = "FRONT";
Intent camera=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
camera.putExtra("android.intent.extras.CAMERA_FACING", 1); // used this line of code to start the intent of camera
//The ID is 1 that opens FRONT CAMERA of a device
imagePath = getCapturedImageExternal();
destImageFile = new File(imagePath);
camera.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destImageFile));
this.cordova.setActivityResultCallback(PicturePlugin.this);
cordova.getActivity().startActivityForResult(camera,IMAGE_TAKEN);
}
else
{
// if json object has "mode" and that is "BACK"
mode = "BACK";
Intent camera=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
camera.putExtra("android.intent.extras.CAMERA_FACING", 0); //ID is 0 that opens REAR CAMERA of a device
imagePath = getCapturedImageExternal();
destImageFile = new File(imagePath);
camera.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destImageFile));
this.cordova.setActivityResultCallback(PicturePlugin.this);
cordova.getActivity().startActivityForResult(camera,IMAGE_TAKEN);
}
}
else
{
//if no "mode" is found in json object then by default rear camera is opening
Intent camera=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
camera.putExtra("android.intent.extras.CAMERA_FACING", 0);
imagePath = getCapturedImageExternal();
destImageFile = new File(imagePath);
camera.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(destImageFile));
this.cordova.setActivityResultCallback(PicturePlugin.this);
cordova.getActivity().startActivityForResult(camera,IMAGE_TAKEN);
}
}
catch (Exception e)
{
Log.i(TAG, "Exception "+e.getMessage());
callbackContext.error("failed");
}
return true;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent)
{
if (requestCode == IMAGE_TAKEN && resultCode == Activity.RESULT_OK) {
File finalFile = null;
File fileTobeDeleted = null;
Bitmap photo = null;
File sd = new File(Environment.getExternalStorageDirectory(),
Constants.GOBIZMO_IMAGE_DIR);
String destinationImagePath = File.separator
+ Constants.TEMP_CAMERA_IMAGE + ".JPEG";
File destination = new File(sd, destinationImagePath);
sd.setWritable(true);
try {
String encoded;
imagePath = destImageFile.getAbsolutePath();
finalFile = new File(imagePath);
fileTobeDeleted = new File(imagePath);
int angle = getAngle(finalFile.getAbsolutePath());
if (finalFile.exists()) {
photo = BitmapFactory.decodeFile(finalFile
.getAbsolutePath());
Matrix matrix = new Matrix();
matrix.postRotate(angle);
Bitmap scaledBitmap = Bitmap.createScaledBitmap(photo, imageWidth, imageHeight, true);
photo = Bitmap.createBitmap(scaledBitmap, 0, 0, imageWidth, imageHeight, matrix, true);
// //////New orientation fix for all
// devices///////////////////////
try {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);
Log.e("base 64 image", encoded);
JSONObject object = new JSONObject();
object.put(callback, encoded);
finalFile.delete();
fileTobeDeleted.delete();
//imagePath = destination.getPath();
if(new File(imagePath).exists()){
new File(imagePath).delete();
}
callbackContext.success(encoded);
} catch (Exception e) {
e.printStackTrace();
Log.i(TAG, "onActivityResult " + e.getMessage());
finalFile.delete();
fileTobeDeleted.delete();
if(new File(imagePath).exists()){
new File(imagePath).delete();
}
callbackContext.error("failed");
}
}
} catch (Exception exp) {
exp.printStackTrace();
Log.i(TAG, "onActivityResult " + exp.getMessage());
try {
finalFile.delete();
fileTobeDeleted.delete();
imagePath = destination.getPath();
if(new File(imagePath).exists()){
new File(imagePath).delete();
}
callbackContext.error("failed");
}catch(Exception innerexception){
innerexception.printStackTrace();
}
}
}
}
public Uri getImageUri(Context inContext, Bitmap inImage)
{
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
}
public String getRealPathFromURI(Uri uri)
{
Cursor cursor = cordova.getActivity().getContentResolver().query(uri, null, null, null, null);
cursor.moveToFirst();
int idx = cursor.getColumnIndex(Images.ImageColumns.DATA);
return cursor.getString(idx);
}
public static String getCapturedImageExternal() {
// External sdcard location
File mediaStorageDir = new File(
android.os.Environment.getExternalStorageDirectory(),
"Gobizmo image");
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()){
mediaStorageDir.mkdirs();
}
if (!mediaStorageDir.exists() && !mediaStorageDir.mkdirs()) {
Log.d(Constants.GOBIZMO_IMAGE_DIR, "Oops! Failed create "
+ Constants.GOBIZMO_IMAGE_DIR + " directory");
return null;
}
// Create a timestamp
return mediaStorageDir.getPath() + File.separator + Constants.TEMP_CAMERA_IMAGE
+ ".JPEG";
}
public static String getRealPathFromURI(Context context, Uri contentUri) {
String filepath = "";
String uriPath = contentUri.toString();
// Handle local file and remove url encoding
if (uriPath.startsWith("file://")) {
filepath = uriPath.replace("file://", "");
try {
return URLDecoder.decode(filepath, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
try {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(contentUri,
projection, null, null, null);
if (cursor != null && cursor.getCount() != 0) {
int column_index = cursor
.getColumnIndex(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
filepath = cursor.getString(column_index);
}
} catch (Exception e) {
Log.e("Path Error", e.toString());
}
return filepath;
}
private int getAngle(String path)
{
int angle=0;
try
{
ExifInterface ei = new ExifInterface(path);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
Log.i(TAG, "getAngle "+orientation);
switch(orientation)
{
case ExifInterface.ORIENTATION_ROTATE_90:
angle=90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
angle=180;
break;
case ExifInterface.ORIENTATION_ROTATE_270 :
angle=270;
default:
angle=0;
}
}
catch(Exception ex)
{
Log.i("getAngle", "getAngle :: "+ex.getMessage());
}
return angle;
}
}
<uses-feature android:name="android.hardware.camera.front" /> <!-- used this feature to open the front camera -->