Android 获取手机图片

来源：互联网发布：大数据精准营销编辑：程序博客网时间：2024/04/23 16:44

1.找到图片存放的路径

2.迭代此路径下是否存在后缀名与图片的后缀名相符合

3.相符合就把文件存放在list中

4.规格图片的大小

那么下面开始看代码

String path = null;

ArrayList<String> list= null;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

/*判断sd卡是否存在*/

boolean sdCardExist = Environment.getExternalStorageState()
.equals(android.os.Environment.MEDIA_MOUNTED);

/*获取存放的路径*/

if(sdCardExist){

path = Environment.getExternalStorageDirectory()+" ";

}

LoadImageList();

}

public static boolean LoadImageList() {
       try {
           if (path == null || path.length() == 0)
               return false;

            list= new ArrayList<String>();

           findFile(path);

           return true;
       } catch(Exception ex) {

           ex.printStackTrace();
           return false;
       }

     /*图片的迭代*/
   public static ArrayList<String> findFile(final String strPath) {
       fileList = new ArrayList<String>();

            File file = new File(strPath);
            File[] files = file.listFiles();

            if (files == null) {
                return null;
            }

            for(int i = 0; i < files.length; i++) {
                final File f = files[i];
                if(f.isFile()) {
                    try{
                        int idx = f.getPath().lastIndexOf(".");
                        if (idx <= 0) {
                            continue;
                        }
                        String suffix = f.getPath().substring(idx);
                        if (suffix.toLowerCase().equals(".jpg") ||
                            suffix.toLowerCase().equals(".jpeg") ||
                            suffix.toLowerCase().equals(".bmp") ||
                            suffix.toLowerCase().equals(".png") ||
                            suffix.toLowerCase().equals(".gif") )
                        {
                           fileList.add(f.getPath());
                        }

                    } catch(Exception e) {
                        e.printStackTrace();
                    }
                }
            }

              /*规格图片的大小并转换为二进制数据*/
   public static boolean loadImageFile() {
           try {
               imageData = null;

               File imageFile = new File(path);
               if (imageFile.exists() == false)
                   return false;

                BitmapFactory.Options o = new BitmapFactory.Options();
                o.inJustDecodeBounds = true;
                BitmapFactory.decodeStream(new FileInputStream(imageFile),null,o);

                int width_tmp=o.outWidth, height_tmp=o.outHeight;
                int scale=1;
                while(true){
                    if(width_tmp/2<width || height_tmp/2<height)
                        break;
                    width_tmp/=2;
                    height_tmp/=2;
                    scale*=2;
                }


                BitmapFactory.Options o2 = new BitmapFactory.Options();
                o2.inSampleSize=scale;

                 bitmap = BitmapFactory.decodeStream(new FileInputStream(imageFile), null, o2);
               ByteArrayOutputStream buf = new ByteArrayOutputStream();
               bitmap.compress(Bitmap.CompressFormat.PNG, 100, buf);
               buf.flush();

               imageData = buf.toByteArray();
               buf.close();

              return true;
           } catch(Exception ex) {
               ex.printStackTrace();
               return false;
           }

       }

}