调用系统相机拍照获取图片或者从相册中调用本地图片显示问题

            需求是这样的：打开系统或者第三方相机app拍照，然后使用所拍照片进行处理，或者直接调用系统或者第三方相册app，选择图片返回使用。需求很简单，过程很蛋疼，网上有很多方法，不过有很多不好用的地方，最后使用的这种方式还不错，记录一下，还是那句话，我很懒，以后复制使用直接复制代码：

           1.调用相机拍照返回所拍照片(不是缩略图)，点击按钮，调用相机：

Intent intent = new Intent();
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
File file = new File(getExternalFilesDir(Environment.DIRECTORY_DCIM) +"/bidata");
if (!file.exists()) {
file.mkdirs();
}
intent.putExtra(MediaStore.Images.Media.ORIENTATION, 0);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(file, "cameraTmp.png")));
startActivityForResult(intent, 0);     获取所得照片：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
switch (requestCode) {
case 0:
Bitmap bitmap = CommonUtils.getBitmap(this, getExternalFilesDir(Environment.DIRECTORY_DCIM) + "/bidata/"+ "cameraTmp.png");
break;
}
super.onActivityResult(requestCode, resultCode, data);
} 2.调用相册获取图片
Intent picture = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(picture, 1);        获取所得到的图片：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
switch (requestCode) {
case 1:
CommonUtils.bitmap = BitmapFactory.decodeFile(CommonUtils.getRealFilePath(this, data.getData()));
break;
}
}
super.onActivityResult(requestCode, resultCode, data);
}  最后把两个加载bitmap的方法贴出来：
/**
* 由string类型的路径加载图片
*
* @param context
* @param path
* @return
*/
public static Bitmap getBitmap(Context context, String path) {

Uri uri = Uri.fromFile(new File(path));
InputStream in = null;
try {
in = context.getContentResolver().openInputStream(uri);
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;

BitmapFactory.decodeStream(in, null, o);
in.close();

int scale = 1;
if (o.outHeight > 1024 || o.outWidth > 1024) {
scale = (int) Math.pow(
2,
(int) Math.round(Math.log(1024 / (double) Math.max(
o.outHeight, o.outWidth)) / Math.log(0.5)));
}
if (scale < 4) {
scale = 4;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
in = context.getContentResolver().openInputStream(uri);
Bitmap b = BitmapFactory.decodeStream(in, null, o2);
in.close();

return b;
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
return null;
}
/**
* 将图片的uri转为绝对路径
*
* @param context
* @param uri
* @return
*/
public static String getRealFilePath(final Context context, final Uri uri) {
if (null == uri)
return null;
final String scheme = uri.getScheme();
String data = null;
if (scheme == null)
data = uri.getPath();
else if (ContentResolver.SCHEME_FILE.equals(scheme)) {
data = uri.getPath();
} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {
Cursor cursor = context.getContentResolver().query(uri,
new String[]{MediaStore.Images.ImageColumns.DATA}, null, null, null);
if (null != cursor) {
if (cursor.moveToFirst()) {
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
if (index > -1) {
data = cursor.getString(index);
}
}
cursor.close();
}
}
return data;
}       也 希望对有需要的战友有帮助。。。。