将图片保存到系统相冊的两种方法[通俗易懂]

第一种：採用系统的api直接使用：

ContentResolver cr = getContentResolver();
					String url = MediaStore.Images.Media.insertImage(cr, bmp,
							String.valueOf(System.currentTimeMillis()), "");

可是，这样的方式必须得刷新图库：

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));

虽然如此，这样的方法还是仅仅能适合安卓4.4下面的手机，若是4.4以上的手机就会报错。因此建议採用另外一种方式来写。

另外一种：直接採用文件流进行保存到相冊

File tempFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath() + "/"
 + String.valueOf(System.currentTimeMillis()) + ".png");
					if(tempFile.exists()){
						tempFile.delete();
					}
					try {
						tempFile.createNewFile();
					} catch (IOException e) {
						e.printStackTrace();
					}
					FileOutputStream fOut = null;
					try {
						fOut = new FileOutputStream(tempFile);
					} catch (FileNotFoundException e) {
						e.printStackTrace();
					}
					bmp.compress(Bitmap.CompressFormat.PNG, 100, fOut);
					try {
						fOut.flush();
						fOut.close();
					} catch (IOException e) {
						// TODO: handle exception
						e.printStackTrace();
					}

最后把整个方法贴出来：

/**
	 * 將ImageView中的圖片保存到系统相冊
	 */
	private void SaveImageToSysAlbum() {
		if (FileUtil.isSdCardExist()) {
			BitmapDrawable bmpDrawable = (BitmapDrawable)mFullImageView.getDrawable();
			Bitmap bmp = bmpDrawable.getBitmap();
			if (bmp != null) {
				try {
					/*ContentResolver cr = getContentResolver();
					String url = MediaStore.Images.Media.insertImage(cr, bmp,
							String.valueOf(System.currentTimeMillis()), "");*/
					File tempFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath() + "/"
 + String.valueOf(System.currentTimeMillis()) + ".png");
					if(tempFile.exists()){
						tempFile.delete();
					}
					try {
						tempFile.createNewFile();
					} catch (IOException e) {
						e.printStackTrace();
					}
					FileOutputStream fOut = null;
					try {
						fOut = new FileOutputStream(tempFile);
					} catch (FileNotFoundException e) {
						e.printStackTrace();
					}
					bmp.compress(Bitmap.CompressFormat.PNG, 100, fOut);
					try {
						fOut.flush();
						fOut.close();
					} catch (IOException e) {
						// TODO: handle exception
						e.printStackTrace();
					}
					
					Toast.makeText(this, getString(R.string.save_succ), Toast.LENGTH_SHORT).show();

				} catch (Exception e) {
					e.printStackTrace();
				}
			}else {
				Toast.makeText(this, getString(R.string.no_iamge_save_fail), Toast.LENGTH_SHORT).show();
			}
		}else {
			Toast.makeText(this, getString(R.string.no_sdcard_save_fail), Toast.LENGTH_SHORT).show();
		}
		String release = android.os.Build.VERSION.RELEASE;
		String tempID = release.substring(0, 3);
		if(Double.parseDouble(tempID) >= 4.4){//安卓4.4以上版本号的时候使用这个。下面的使用else语句里面的
			MediaScannerConnection.scanFile(this,new String[]{Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath() + "/" }, null,null);
		}else {
			sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
			MediaScannerConnection.scanFile(this,new String[]{Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath() + "/" }, null,null); 
		}
		
		
	}