android 4.4 系统图片库调用

<span style="font-family: Arial, Helvetica, sans-serif;">private String[] items = new String[] { "图库","拍照" };</span>

/* 头像名称 */
private static final String IMAGE_FILE_NAME = "face.jpg";
/* 请求码 */
private static final int IMAGE_REQUEST_CODE = 0;
private static final int SELECT_PIC_KITKAT = 3;
private static final int CAMERA_REQUEST_CODE = 1;
private static final int RESULT_REQUEST_CODE = 2;

private void showSettingFaceDialog() {

new AlertDialog.Builder(this)
.setTitle("图片来源")
.setCancelable(true)
.setItems(items, new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0:// Local Image
Intent intent=new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
startActivityForResult(intent,SELECT_PIC_KITKAT);
} else {
startActivityForResult(intent,IMAGE_REQUEST_CODE);
}
break;
case 1:// Take Picture
Intent intentFromCapture = new Intent(
MediaStore.ACTION_IMAGE_CAPTURE);
// 判断存储卡是否可以用，可用进行存储
if (hasSdcard()) {
intentFromCapture.putExtra(
MediaStore.EXTRA_OUTPUT,
Uri.fromFile(new File(Environment
.getExternalStorageDirectory(),
IMAGE_FILE_NAME)));
}
startActivityForResult(intentFromCapture,
CAMERA_REQUEST_CODE);
break;
}
}
})
.setNegativeButton("取消",
new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog,
int which) {
dialog.dismiss();
}
}).show();

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// 结果码不等于取消时候
if (resultCode != RESULT_CANCELED) {
switch (requestCode) {
case IMAGE_REQUEST_CODE:
startPhotoZoom(data.getData());
break;
case SELECT_PIC_KITKAT:
startPhotoZoom(data.getData());
break;
case CAMERA_REQUEST_CODE:
if (hasSdcard()) {
File tempFile = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);
startPhotoZoom(Uri.fromFile(tempFile));
} else {
ToastUtils.showShort(context,"未找到存储卡，无法存储照片！");
}

break;
case RESULT_REQUEST_CODE:
if (data != null) {
setImageToView(data,iv_face);
}
break;
}
}
super.onActivityResult(requestCode, resultCode, data);
}

/**
* 裁剪图片方法实现
*
* @param uri
*/
public void startPhotoZoom(Uri uri) {
if (uri == null) {
Log.i("tag", "The uri is not exist.");
return;
}

Intent intent = new Intent("com.android.camera.action.CROP");
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
String url=getPath(context,uri);
intent.setDataAndType(Uri.fromFile(new File(url)), "image/*");
}else{
intent.setDataAndType(uri, "image/*");
}

// 设置裁剪
intent.putExtra("crop", "true");
// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX outputY 是裁剪图片宽高
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 200);
intent.putExtra("return-data", true);
startActivityForResult(intent, RESULT_REQUEST_CODE);
}

/**
* 保存裁剪之后的图片数据
*
* @param picdata
*/
private void setImageToView(Intent data,ImageView imageView) {
Bundle extras = data.getExtras();
if (extras != null) {
Bitmap photo = extras.getParcelable("data");
Bitmap roundBitmap=ImageUtil.toRoundBitmap(photo);
imageView.setImageBitmap(roundBitmap);
saveBitmap(photo);
}
}

public void saveBitmap(Bitmap mBitmap) {
File f = new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME);
try {
f.createNewFile();
FileOutputStream fOut = null;
fOut = new FileOutputStream(f);
mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
fOut.flush();
fOut.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

//以下是关键，原本uri返回的是file:///...来着的，android4.4返回的是content:///...
@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];
}

}
// 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 the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();

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 index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(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());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}