这里以选择手机相册为例子，
1、打开手机相册：
```
public static void localPhone(Activity baseActivity) {
Intent intent = new Intent(
Intent.ACTION_PICK,
MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
baseActivity.startActivityForResult(intent, G.LOCAL_PHONE);// //适用于4.4及以上android版本
}
```
2、在Activity的onActivityResult处理：
```
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) { // 从相册中选择返回
if (requestCode == G.LOCAL_PHONE) {
headImageFile = ImageTools.getCropImageFilePath(this);
ImageTools.startPhotoZoom(HomeActivity.this, data.getData(), headImageFile);
}
if (requestCode == G.CRIP_PHONE) { // 从裁剪后返回
Bundle bundle = data.getExtras();
if (bundle != null) {
//在这里获得了剪裁后的Bitmap对象，可以用于上传
Bitmap image = bundle.getParcelable("data");
home_im_label.setImageBitmap(image);
Log.d("裁剪路径:", headImageFile.getAbsolutePath());
}
}
}
}
```
代码中startPhotoZoom的方法：
```
/**
* 裁剪图片方法实现
* 拍照调用startPhotoZoom(tempUri,this);
* 从本地选取调用startPhotoZoom(data.getData(),this);
*
* @param uri
*/
public static void startPhotoZoom(Activity baseActivity, Uri uri,File outFile) {
if (uri == null) {
Log.i("startPhotoZoom", "The uri is not exist.");
}
Intent intent = new Intent("com.android.camera.action.CROP");
File uriFile = new File(TTImageUtil.getPath(baseActivity, uri));
Log.i("startPhotoZoom", "uriFile path:" + uriFile.getAbsolutePath());
Uri imageUri;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
imageUri = FileProvider.getUriForFile(baseActivity, BuildConfig.APPLICATION_ID + ".fileProvider", uriFile);
} else {
imageUri = Uri.fromFile(uriFile);
}
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
intent.setDataAndType(imageUri, "image/*");
// crop为true是设置在开启的intent中设置显示的view可以剪裁
intent.putExtra("crop", "true");
intent.putExtra("scale", true);
// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX,outputY 是剪裁图片的宽高
intent.putExtra("outputX", 150);
intent.putExtra("outputY", 150);
intent.putExtra("return-data", false);
// 取消人脸识别
intent.putExtra("noFaceDetection", true);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(outFile));//定义输出的File Uri
baseActivity.startActivityForResult(intent, G.CRIP_PHONE);
}
```
getCropImageFilePath方法的代码：
```
/**
* 裁剪后，把图片放在这里
* @param context
* @return
*/
public static File getCropImageFilePath(Context context) {
File imageFile = new File(context.getExternalFilesDir(""), "cropImage.jpg");
try {
if (imageFile.exists()) {
imageFile.delete();
}
imageFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
return imageFile;
}
```
注意7.0以上的手机系统为了适配Uri.fromFile的方法，必须配置FileProvider，
1. 在主项目的res新建文件夹为xml，并添加file_provider_paths.xml在xml文件夹下，如图：
file_provider_paths.xml的内容：
```
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
name="external_hsyg"
path="." />
<cache-path
name="update_cache"
path="." />
</paths>
```
2.在AndroidMainfest.xml配置provider，application的节点内添加如下代码：
```
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.employee.fileProvider"
android:exported="false"
android:grantUriPermissions="true"
tools:replace="android:authorities">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_provider_paths"
tools:replace="android:resource" />
</provider>
```
如果是用了androidX的话，就不能引用support包，要像如下：
```
<provider
android:name="androidx.core.content.FileProvider"
android:authorities="com.org.wms.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_provider_paths"/>
</provider>
```
那就大功告成了！
最后，注意下从相册选择图片回来后的Uri路径的读取，4.4以上系统要做特别的处理，上面的代码已经做了，现在贴最后的代码供参考：
```
import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
class TTImageUtil {
@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());
}
}
```
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