android 拍照與相冊使用總結

一.拍照發起拍照動作

public void photo() {
        try{
            Intent openCameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            openCameraIntent.putExtra(MediaStore. EXTRA_OUTPUT, Uri.fromFile( new File(Environment.getExternalStorageDirectory(), "temp.jpg")));
            startActivityForResult(openCameraIntent, TAKE_PICTURE);
        } catch (Exception e){
            Log. e(TAG,e.getMessage());
        }

    }

拍完照片的回調方法邏輯

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode,resultCode,data);
        switch (requestCode) {
            case TAKE_PICTURE :
                if (Bimp.tempSelectBitmap .size() < 9 && resultCode == RESULT_OK) {
                    //將保存在本地的圖片取出並縮小後顯示在界面上
                    String aa = Environment.getExternalStorageDirectory()+ "/temp.jpg";
                    Log.e(TAG,"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA:"+aa);
                    Bitmap camorabitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+"/temp.jpg");
                    if(null != camorabitmap ){
                        // 下面這兩句是對圖片按照一定的比例縮放，這樣就可以完美地顯示出來。
                        int scale = Bimp.reckonThumbnail(camorabitmap.getWidth(),camorabitmap.getHeight(), 500, 600);
                        Bitmap bitMap = Bimp. PicZoom(camorabitmap, camorabitmap.getWidth() / scale,camorabitmap.getHeight() / scale);
                        //由於Bitmap內存佔用較大，這裏需要回收內存，否則會報out of memory異常
                        camorabitmap.recycle();
                        camorabitmap= null;

                        String  timestamp = Integer.toString((int)(System. currentTimeMillis() / 1000));
                        File tempFile = new File(Environment.getExternalStorageDirectory(), "temp.jpg");
                        File saveFile = new File(Environment.getExternalStorageDirectory(), timestamp+ ".jpg");
                        tempFile.renameTo(saveFile);

                        String filePath = timestamp+ ".jpg";
                        ImageItem takePhoto = new ImageItem();
                        takePhoto.setImagePath(filePath);
                        takePhoto.setBitmap(bitMap);
                        Bimp. tempSelectBitmap.add(takePhoto);
                        adapter.notifyDataSetChanged();
                    }

                }
                break;
            case DEL_PICTURE :
                if(resultCode == 1){
                    adapter.notifyDataSetChanged();
                }
                break;
        }
    }

1.其中主要是按照壓縮的尺寸計算出壓縮的比例，然後進行壓縮得到壓縮後的圖片數據

int scale = Bimp.reckonThumbnail(camorabitmap.getWidth(),camorabitmap.getHeight(), 500, 600);
Bitmap bitMap = Bimp. PicZoom(camorabitmap, camorabitmap.getWidth() / scale,camorabitmap.getHeight() / scale);

//計算需要壓縮的比例

public static int reckonThumbnail (int oldWidth, int oldHeight, int newWidth, int newHeight) {
               if ((oldHeight > newHeight && oldWidth > newWidth)
                           || (oldHeight <= newHeight && oldWidth > newWidth)) {
                      int be = (int ) (oldWidth / (float) newWidth);
                      if (be <= 1)
                           be = 1;
                      return be;
              } else if (oldHeight > newHeight && oldWidth <= newWidth) {
                      int be = (int ) (oldHeight / (float) newHeight);
                      if (be <= 1)
                           be = 1;
                      return be;
              }
               return 1;
 }

//根據比例壓縮得到壓縮的數據

public static Bitmap PicZoom(Bitmap bmp, int width, int height) {
               int bmpWidth = bmp.getWidth();
               int bmpHeght = bmp.getHeight();
              Matrix matrix = new Matrix();
              matrix.postScale(( float) width / bmpWidth, (float) height / bmpHeght);
               return Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeght, matrix, true);
 }

二.從相冊中選取

private void choosePhoto () {
               // Intent intent = new Intent(Intent.ACTION_PICK);

               // Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
              Intent intent = new Intent(Intent.ACTION_PICK,
                            android.provider.MediaStore.Images.Media. EXTERNAL_CONTENT_URI);
              intent.setType( "image/*");// 相片類型
              startActivityForResult(intent, REQUEST_CODE_PICK_IMAGE);
       }

               case REQUEST_CODE_PICK_IMAGE :
                      if(resultCode == Activity.RESULT_OK) {
                            Uri imageUri = data.getData();
                            if(null != imageUri && !"".equals(imageUri)){
                                   Photo photo = new Photo();
                                   ContentResolver cr = this.getContentResolver();
                                   try {
                                          String[] filePathColumn = {MediaStore.Images.Media.DATA };
                                          Cursor cursor =
                                          getContentResolver().query(imageUri,filePathColumn, null, null,
                                          null);
                                          cursor.moveToFirst(); //將遊標移到第一位
                                          int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                                          String imagePath = cursor.getString(columnIndex);//獲取圖片路徑
                                          photo.setType(2); //來源sd卡
                                          photo.setPath(imagePath);

                                          LXLog. i("相冊", imagePath);
                                          imageGrid.setVisibility(View.VISIBLE);
                                          PhotoContext. photos.add(photo);
                                          photoGrid.notifyDataSetChanged();
                                          cursor.close(); //關閉遊標

                                          } catch (Exception e) {
                                          Toast. makeText(getApplicationContext(), "內存溢出" ,
                                          Toast. LENGTH_LONG).show();
                                          e.printStackTrace();
                                   }
                            }
                      }

三上傳附件，選擇文件 onActivityResult 裏面的關鍵代碼

case FILE_SELECT_CODE:
                      if (data != null) {

                           Uri uri = data.getData();
                           String path = URLUtil. getPath(this, uri);
                            if (!StringUtils.isEmpty(path)) {
                                   progress = new ProgressDialog(EditWorkDiaryActivity.this );
                                   progress.setProgressStyle(ProgressDialog. STYLE_HORIZONTAL);
                                   progress.setMessage( "附件上傳" );
                                   progress.setOnCancelListener( new DialogInterface.OnCancelListener() {

                                          @Override
                                          public void onCancel(DialogInterface dialog) {
                                                 progress.dismiss();
                                                HttpAsyncUtil. cancel(EditWorkDiaryActivity.this,
                                                               true);

                                         }
                                  });
                                   progress.setCancelable( true);
                                   progress. setButton("取消",
                                                 new DialogInterface.OnClickListener() {
                                                        @Override
                                                        public void onClick(DialogInterface dialog,
                                                                      int which) {
                                                               progress.dismiss();
                                                              HttpAsyncUtil. cancel(
                                                                            EditWorkDiaryActivity. this, true);
                                                       }

                                                }) ;

                                   progress.show();

                                  uploadAttachment(path);

                           }

                     }
                      break;

URLUtil.getPath(this, uri);

工具方法主要解決個個手機的文件存儲位置不一致問題

package com.shjy.jingin.util;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.LinkedHashMap;
import java.util.Map;
import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

/**
* Created by Administrator on 2015/11/5.
*/
public class URLUtil {
    public static void main(String [] args){
        String url = "sms:10086?body=%E5%BC%A0%E6%88%90%E9%BE%99%E9%82%80%E8%AF%B7%E6%82%A8%E5%8A%A0%E5%85%A5%E4%B8%8A%E6%B5%B7%E6%96%87%E6%80%9D%E6%B5%B7%E8%BE%89%E9%9B%86%E5%9B%A2,%E8%AF%B7%E7%82%B9%E5%87%BB%E9%93%BE%E6%8E%A5[http://www.jingin.cn/invite.htm?code=Pd9g4l]%E5%AE%8C%E6%88%90%E6%B3%A8%E5%86%8C%EF%BC%8C%E8%AF%A5%E9%93%BE%E6%8E%A524%E5%B0%8F%E6%97%B6%E5%86%85%E6%9C%89%E6%95%88%E3%80%82[%E7%BB%8F%E8%90%A5%E7%AE%A1%E5%AE%B6]";
        try {
//            Uri uri = Uri.parse(url);
//            String body = uri.getQueryParameter("body")==null?"":uri.getQueryParameter("body");
            Map map = splitQuery(url);
            String body = (String)map.get("body");
            System.out.println(body);
        }catch (Exception e){
            e.printStackTrace();
        }

//        Map kvMap;
//        try {
//            kvMap = URLUtil.splitQuery("http://www.phpcode8.com/?p=1451&id=888&xx=yy");
//            System.out.println(kvMap.get("id"));
//        } catch (UnsupportedEncodingException e) {
//            e.printStackTrace();
//        } catch (MalformedURLException e) {
//            e.printStackTrace();
//        }
    }
    public static Map splitQuery(String url) throws UnsupportedEncodingException {
        Map query_pairs = new LinkedHashMap();
        int beginIndex = url.indexOf("?")==-1?0:url.indexOf("?")+1;
        String query = url.substring(beginIndex);
        String[] pairs = query.split("&");
        for (String pair : pairs) {
            int idx = pair.indexOf("=");
            query_pairs.put(URLDecoder.decode(pair.substring(0, idx), "UTF-8"), URLDecoder.decode(pair.substring(idx + 1), "UTF-8"));
        }
        return query_pairs;
    }

    /**
     * Get a file path from a Uri. This will get the the path for Storage Access
     * Framework Documents, as well as the _data field for the MediaStore and
     * other file-based ContentProviders.
     *
     * @param context The context.
     * @param uri The Uri to query.
     * @author paulburke
     */
    @SuppressLint("NewApi")
     public static String getPath(final Context context, final Uri uri) {

        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

        // DocumentProvider
        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            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
            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
            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.
     */
    public 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 column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    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());
    }

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

}