调用摄像头拍照和从相册中选择

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1. 声明对象和注册权限

声明对象

private EditText bookEdit/**编辑图书信息的EditText*/;private ImageView bookImage/**显示图片的按钮*/;private Button takePhotol/**拍照按钮*/, getFromCD/**从相册获取照片按钮*/, upLoad/**上传按钮*/;public static final int TAKE_PHOTOL = 1; /**判断从拍照activity中返回的常量*/public static final int CROP_PHTOL = 2; /**判断从剪裁activity中返回的常量*/public static final int CHOOSE_PHOTOL = 3; /**判断从相册中选择activity中返回的常量*/private Uri imageUri;

注册权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

2.按钮响应

调用摄像头拍照响应

{    //创建File对象，用于存储拍照后的图片，命名为output_image.jpg    File outputImage = new File(Environment.getExternalStorageDirectory(),            "output_image.jpg");    try{        if (outputImage.exists()){            outputImage.delete();        }        outputImage.createNewFile();    }catch (IOException e){        e.printStackTrace();    }    imageUri = Uri.fromFile(outputImage);    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");    //intent为隐式Intent，系统会自动相应这个Intent，拍下的照片会输出到output_image.jpg中    intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);    startActivityForResult(intent,TAKE_PHOTOL);   //启动相机程序}

从相册中选择响应

{    Intent intent = new Intent("android.intent.action.GET_CONTENT");    //隐式Intent    intent.setType("image/*");    startActivityForResult(intent, CHOOSE_PHOTOL); //打开相册}

3.onActivityResult回调方法

@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data){    switch (requestCode){        case TAKE_PHOTOL: //从拍照acativity中返回            if (resultCode == RESULT_OK){                Intent intent = new Intent("com.android.camera.action.CROP");                //隐式Intent                intent.setDataAndType(imageUri,"image/*");                intent.putExtra("scale", true);                intent.putExtra(MediaStore.EXTRA_OUTPUT,CROP_PHTOL);                startActivityForResult(intent, CROP_PHTOL); //启动剪裁程序            }            break;        case CROP_PHTOL:  //从剪裁activity中返回            if(resultCode == RESULT_OK){                try{                    Bitmap bitmap = BitmapFactory.decodeStream(                            getContentResolver().openInputStream(imageUri));                    bookImage.setImageBitmap(bitmap);                }catch (FileNotFoundException e){                    e.printStackTrace();                }            }            break;        case CHOOSE_PHOTOL:  //从相册选择activity中返回            if (resultCode == RESULT_OK){                if (Build.VERSION.SDK_INT >= 19){                    //4.4以上版本用这个方法处理图片                    handleImageOnKitKat(data);                }else {                    //4.4以下的版本用这个方法处理图片                    handleImageBeforKaiKat(data);                }            }            break;        default:            break;    }}

4.从相册中选择的图片处理

@TargetApi(19)private void handleImageOnKitKat(Intent data){    String imagePath = null;    Uri uri = data.getData();    if (DocumentsContract.isDocumentUri(this,uri)){        //如果是document类型的Uri，则通过document id处理        String docId = DocumentsContract.getDocumentId(uri);        if ("com.android.providers.media.documents".equals(                uri.getAuthority())){            //Uri的authority是media格式            String id = docId.split(":")[1]; //解析出数字格式的id            String selection = MediaStore.Images.Media._ID + "=" + id;            imagePath = getImagePath(                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);        }else if ("com.android.Media.providers.downloads.document".equals(                uri.getAuthority())) {            Uri contentUri = ContentUris.withAppendedId(                    Uri.parse("content://downloads/public_downloads"),                    Long.valueOf(docId));            imagePath = getImagePath(contentUri, null);        }    }else if ("content".equalsIgnoreCase(uri.getScheme())){        //如果不是document类型的Uri，则用普通方式处理        imagePath = getImagePath(uri, null);    }    displayImage(imagePath); //根据图片路径显示图片}private void handleImageBeforKaiKat(Intent data){    Uri uri = data.getData();    String imagePath = getImagePath(uri,null);    displayImage(imagePath);}//通过Uri获取到图片的路径private String getImagePath(Uri uri, String selection){    String path = null;    Cursor cursor = getContentResolver().query(uri,null,selection, null, null);    if (cursor != null){        if (cursor.moveToFirst()){            path = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); /**此处有多个Medio*/        }        cursor.close();    }    return path;}//通过路径显示图片private void displayImage(String imagePath){    if (imagePath != null){        Bitmap bitmap = BitmapFactory.decodeFile(imagePath); //通过路径获取到图片的Bitmap        bookImage.setImageBitmap(bitmap); //把bitmap显示在ImageView上    }else {        Toast.makeText(this,"Failed to get image.", Toast.LENGTH_SHORT).show();    }}

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