照片

1.跳轉到拍照介面

 File imageFile = new File(Environment
                                .getExternalStorageDirectory(), "tempImage.jpg");
                        // 如果存在就刪了重新建立
                        try {
                            if (imageFile.exists()) {
                                imageFile.delete
 
();
                            }
                            imageFile.createNewFile();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        // 將儲存地址轉化成uri物件
                        imageUri =Uri.fromFile(imageFile);
                        // 設定開啟照相的Intent
 

                        Intent intent4 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                        // 設定相片的輸出uri為剛才轉化的imageUri
                        intent4.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
                        // 開啟相機程式，設定requestCode為TOKE_PHOTO
                        startActivityForResult(intent4, IMAGE_MY);
 

2.拍照介面返回後，跳轉到裁剪介面

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == IMAGE_MY && resultCode == RESULT_OK){
            // 設定intent為啟動裁剪程式
            Intent intent = new Intent("com.android.camera.action.CROP");
            // 設定Data為剛才的imageUri和Type為圖片型別
            intent.setDataAndType(imageUri, "image/*");
            // 設定可縮放
            intent.putExtra("scale", true);
            // 設定輸出地址為imageUri
            intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            // 開啟裁剪,設定requestCode為CROP_PHOTO
            startActivityForResult(intent, CROP_PHOTO);
        }
        if (requestCode == CROP_PHOTO){
            Bitmap bitmap;
            try {
                //通過BitmapFactory將imageUri轉化成bitmap
                bitmap = BitmapFactory.decodeStream(getContentResolver()
                        .openInputStream(imageUri));
                //設定顯示
                imageView.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    }

選擇圖片
1.轉到照片選擇介面

   Intent intent4 = new Intent(Intent.ACTION_GET_CONTENT);
                        intent4.setType("image/*");
                        startActivityForResult(intent4,IMAGE_MY);

2.選擇照片介面返回

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //從照片選擇介面返回
        if (requestCode == IMAGE_MY && resultCode == RESULT_OK){
            Uri uri = data.getData();
            //將uri轉化為對應的本地路徑
            String path = getFilePath(MainActivity.this,uri);

            Bitmap bitmap = BitmapFactory.decodeFile(path);
            imageView.setImageBitmap(bitmap);
        }
    }

3.將uri轉換為對應的路徑

 @TargetApi(Build.VERSION_CODES.KITKAT)
    public static String getFilePath(Context context, Uri uri) {
        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider 是否外部儲存內容提供者
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];             if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }            // TODO handle non-primary volumes
            }
            // DownloadsProvider 是否下載內容提供者
            else if (isDownloadsDocument(uri)) {

                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider 是否多媒體內容提供者
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];

                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }

                final String selection = "_id=?";
                final String[] selectionArgs = new String[] {
                        split[1]
                };

                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (and general)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
            return getDataColumn(context, uri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }

        return null;
    }

 /**
     * Get the value of the data column for this Uri. This is useful for
     * MediaStore Uris, and other file-based ContentProviders.
     *
     * @param context The context.
     * @param uri The Uri to query.
     * @param selection (Optional) Filter used in the query.
     * @param selectionArgs (Optional) Selection arguments used in the query.
     * @return The value of the _data column, which is typically a file path.
     */
    private static String getDataColumn(Context context, Uri uri, String selection,
                                        String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {column};
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    /**
     * 判斷外部儲存是否可用
     * 
     *
     */
    public static boolean isExternalStorageWritable() {
        String state = Environment.getExternalStorageState();
        if (Environment.MEDIA_MOUNTED.equals(state)) {
            return true;
        }
        Log.e("", "ExternalStorage not mounted");
        return false;
    }

    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }