两个问题: 1. 通过调用系统Action，从图库中选择图片，并展示到界面上 2. API19前后获取相册图片路径 详见(仅客户端代码),请移步：本人GITHUB
代码语言：javascript复制Intent intent = new Intent();
// Set an explicit MIME data type.
intent.setType("image/*");
// Set the general action to be performed.
intent.setAction(Intent.ACTION_GET_CONTENT);
// callBack
startActivityForResult(intent,1);@Override
protected void onActivityResult(int requestCode,
int resultCode,
Intent data) {
if (resultCode == RESULT_OK) {
Uri uri = data.getData();
ContentResolver cr =this.getContentResolver();
try {
Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
/* 将Bitmap设定到ImageView */
iv_local_pic.setImageBitmap(bitmap);
int sdkVersion = Integer.valueOf(android.os.Build.VERSION.SDK);
Log.d("sdkVersion:", String.valueOf(sdkVersion));
Log.d("KITKAT:", String.valueOf(Build.VERSION_CODES.KITKAT));
if (sdkVersion >= 19) { // 或者 android.os.Build.VERSION_CODES.KITKAT这个常量的值是19
path = uri.getPath();//5.0直接返回的是图片路径 Uri.getPath is ： /document/image:46 ，5.0以下是一个和数据库有关的索引值
System.out.println("path:" path);
// path_above19:/storage/emulated/0/girl.jpg 这里才是获取的图片的真实路径
path = getPath_above19(Upload_HttpUrlConnection_Activity.this, uri);
System.out.println("path_above19:" path);
} else {
path = getFilePath_below19(uri);
}
} catch (FileNotFoundException e) {
Log.e("Exception", e.getMessage(), e);
}
}
super.onActivityResult(requestCode, resultCode, data);
} /**
* API19以下获取图片路径的方法
* @param uri
*/
private String getFilePath_below19(Uri uri) {
//这里开始的第二部分，获取图片的路径：低版本的是没问题的，但是sdk>19会获取不到
String[] proj = {MediaStore.Images.Media.DATA};
//好像是android多媒体数据库的封装接口，具体的看Android文档
Cursor cursor = getContentResolver().query(uri, proj, null, null, null);
//获得用户选择的图片的索引值
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
System.out.println("***************" column_index);
//将光标移至开头 ，这个很重要，不小心很容易引起越界
cursor.moveToFirst();
//最后根据索引值获取图片路径 结果类似：/mnt/sdcard/DCIM/Camera/IMG_20151124_013332.jpg
String path = cursor.getString(column_index);
System.out.println("path:" path);
return path;
}/**
* APIlevel 19以上才有
* 创建项目时，我们设置了最低版本API Level，比如我的是10，
* 因此，AS检查我调用的API后，发现版本号不能向低版本兼容，
* 比如我用的“DocumentsContract.isDocumentUri(context, uri)”是Level 19 以上才有的，
* 自然超过了10，所以提示错误。
* 添加 @TargetApi(Build.VERSION_CODES.KITKAT)即可。
*
* @param context
* @param uri
* @return
*/
@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath_above19(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 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());
}
