單張圖片選擇

1、在build.gradle中dependencies下添加依賴

compile 'com.github.lovetuzitong:MultiImageSelector:1.2'

2、完整activity代碼

public class MainActivity extends AppCompatActivity {private static final int REQUEST_IMAGE3 = 5;public final static int MSG_DO_CUTOUT_GET_PIC = 66;private String path;private File compressedImage1File;//切圖private int nMultiple;private String PhotoPath;private File filePhoto;private int nPreX = 3;private int nPreY = 3;private String strTakePicName = "yxbl.jpg";private static final String[] authBaseArr = {Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE};private static final int authBaseRequestCode = 1;private ImageView imageView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initNavi();//權限方法initZoom();//初始化切圖imageView = (ImageView)findViewById(R.id.testimage);imageView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {MultiImageSelector.create(MainActivity.this).showCamera(true) // 是否顯示相機. 默認為顯示 // .count(6) // 最大選擇圖片數量, 默認為9. 只有在選擇模式為多選時有效.single() // 單選模式 // .multi() // 多選模式, 默認模式; // .origin(strings) // 默認已選擇圖片. 只有在選擇模式為多選時有效.start(MainActivity.this, REQUEST_IMAGE3);}});}public void initZoom(){DisplayMetrics dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);nMultiple = dm.widthPixels;PhotoPath = getImageSavePath(this) + "";createFolder(PhotoPath);}public static void createFolder(String strPath) {File file = new File(strPath);if (!file.exists())file.mkdirs();}public static String getImageSavePath(Context context) {File dataDir ;String path ;if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {dataDir = Environment.getExternalStorageDirectory();path = context.getString(R.string.SDcardPath);} else {dataDir = Environment.getDataDirectory();path = context.getString(R.string.DataPath);}StringBuffer DataPath = new StringBuffer();StringBuffer cachePath = new StringBuffer();DataPath.append(dataDir.getPath()).append(path);cachePath.append(DataPath.toString()).append(".cache");File cache = new File(cachePath.toString());if (!cache.exists()) {cache.mkdirs();}return DataPath.toString();}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);List<LocalMedia> images;if (resultCode == RESULT_OK) {switch (requestCode) {case 5:if (requestCode == REQUEST_IMAGE3) {if (resultCode == RESULT_OK) {List<String> pathImage = data.getStringArrayListExtra(MultiImageSelectorActivity.EXTRA_RESULT); // strings = data.getStringArrayListExtra(MultiImageSelectorActivity.EXTRA_RESULT);for (int a = 0; a < pathImage.size(); a++) {path = pathImage.get(0);compressedImage1File = new File(path);// String param = compressedImage1File.getPath(); // Bitmap bitmap= BitmapFactory.decodeFile(param); // imageView.setImageBitmap(bitmap);startPhotoZoom(Uri.fromFile(compressedImage1File));//切圖方法}}}break;case MSG_DO_CUTOUT_GET_PIC:String param2= filePhoto.getPath();Bitmap bitmap2= BitmapFactory.decodeFile(param2);imageView.setImageBitmap(bitmap2);break;}}}//開啟截圖public void startPhotoZoom(Uri uri) {strTakePicName = getTime() + "yxbl.jpg";filePhoto = new File(PhotoPath, strTakePicName);Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(uri, "image/*");// crop為true是設置在開啟的intent中設置顯示的view可以剪裁intent.putExtra("crop", "true");// aspectX aspectY 是寬高的比例intent.putExtra("aspectX", nPreX);intent.putExtra("aspectY", nPreY);// outputX,outputY 是剪裁圖片的寬高intent.putExtra("outputX", nMultiple);intent.putExtra("outputY", nPreY * nMultiple / nPreX);intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(filePhoto));intent.putExtra("return-data", false);intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());intent.putExtra("noFaceDetection", true); // no face detection // Log.v("lgq", "startPhotoZoom=//開啟截圖=====" + compressedImage1File);startActivityForResult(intent, MSG_DO_CUTOUT_GET_PIC);}public String getTime() {long time = System.currentTimeMillis() / 1000;//獲取系統時間的10位的時間戳String str = String.valueOf(time);return str;}private boolean hasBasePhoneAuth() {PackageManager pm = getPackageManager();for (String auth : authBaseArr) {if (pm.checkPermission(auth, getPackageName()) != PackageManager.PERMISSION_GRANTED) {return false;}}return true;}private void initNavi() {StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();StrictMode.setVmPolicy(builder.build());builder.detectFileUriExposure();// 申請權限if (android.os.Build.VERSION.SDK_INT >= 23) {if (!hasBasePhoneAuth()) {this.requestPermissions(authBaseArr, authBaseRequestCode);return;}}}}

下篇多圖選擇器：https://mp.csdn.net/postedit/82115774

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文件選擇器

1、工具方法

/*** 作者：created by meixi* 郵箱：1085220040@qq.com* 日期：2019/12/13 13:50*/ public class ContentUriUtil {/*** Get a file path from a Uri. This will get the the path for Storage Access* Framework Documents, as well as the _data field for the MediaStore and* other file-based ContentProviders.** @param context The context.* @param uri The Uri to query.* @author paulburke*/public static String getPath(final Context context, final Uri uri) {final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;;// DocumentProviderif (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {// ExternalStorageProviderif (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}// DownloadsProviderelse 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);}// MediaProviderelse 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 addressif (isGooglePhotosUri(uri))return uri.getLastPathSegment();return getDataColumn(context, uri, null, null);}// Fileelse 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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2、實現activity

public class Main2Activity extends AppCompatActivity {private TextView filePath;private Button btnSelect;private static final String[] authBaseArr = {//申請類型Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE,};private static final int authBaseRequestCode = 1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main2);filePath = findViewById(R.id.open_file);btnSelect = findViewById(R.id.file_path);initNavi();btnSelect.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {openSystemFile();}});}public void openSystemFile() {Intent intent = new Intent(Intent.ACTION_GET_CONTENT);// 所有類型intent.setType("*/*");intent.addCategory(Intent.CATEGORY_DEFAULT);intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);try {startActivityForResult(Intent.createChooser(intent, "請選擇文件"), 1);} catch (ActivityNotFoundException e) {e.printStackTrace();Toast.makeText(Main2Activity.this, "請安裝文件管理器", Toast.LENGTH_SHORT).show();}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == 1 && resultCode == Activity.RESULT_OK) {//Get the Uri of the selected fileUri uri = data.getData();if (null != uri) {String path = ContentUriUtil.getPath(this, uri);Log.i("filepath", " = " + path);updateFilePath(path);}}}private void updateFilePath(final String path) {runOnUiThread(new Runnable() {@Overridepublic void run() {filePath.setText(path);}});}private boolean hasBasePhoneAuth() {PackageManager pm = getPackageManager();for (String auth : authBaseArr) {if (pm.checkPermission(auth, getPackageName()) != PackageManager.PERMISSION_GRANTED) {return false;}}return true;}private void initNavi() {// 申請權限if (android.os.Build.VERSION.SDK_INT >= 23) {if (!hasBasePhoneAuth()) {this.requestPermissions(authBaseArr, authBaseRequestCode);return;}}}}

權限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

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根據URI獲取文件真實路徑

Uri uri = data.getData(); String filePath = FileUtil.getFilePathByUri(this, uri); /*** @author : LGQ* @date : 2020/05/04 13* @desc :*/ public class FileUtil {/*** 根據URI獲取文件真實路徑（兼容多張機型）*/public static String getFilePathByUri (Context context, Uri uri) {if ("content".equalsIgnoreCase(uri.getScheme())) {int sdkVersion = Build.VERSION.SDK_INT;if (sdkVersion >= 19) { // api >= 19return getRealPathFromUriAboveApi19(context, uri);} else { // api < 19return getRealPathFromUriBelowAPI19(context, uri);}} else if ("file".equalsIgnoreCase(uri.getScheme())) {return uri.getPath();}return null;}/*** 適配api19及以上,根據uri獲取圖片的絕對路徑** @param context 上下文對象* @param uri 圖片的Uri* @return 如果Uri對應的圖片存在, 那么返回該圖片的絕對路徑, 否則返回null*/@SuppressLint("NewApi")private static String getRealPathFromUriAboveApi19 (Context context, Uri uri) {String filePath = null;if (DocumentsContract.isDocumentUri(context, uri)) {// 如果是document類型的 uri, 則通過document id來進行處理String documentId = DocumentsContract.getDocumentId(uri);if (isMediaDocument(uri)) { // MediaProvider// 使用':'分割String type = documentId.split(":")[0];String id = documentId.split(":")[1];String selection = MediaStore.Images.Media._ID + "=?";String[] selectionArgs = {id};//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;}filePath = getDataColumn(context, contentUri, selection, selectionArgs);} else if (isDownloadsDocument(uri)) { // DownloadsProviderUri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(documentId));filePath = getDataColumn(context, contentUri, null, null);} else if (isExternalStorageDocument(uri)) {// ExternalStorageProviderfinal String docId = DocumentsContract.getDocumentId(uri);final String[] split = docId.split(":");final String type = split[0];if ("primary".equalsIgnoreCase(type)) {filePath = Environment.getExternalStorageDirectory() + "/" + split[1];}} else {//Log.e("路徑錯誤");}} else if ("content".equalsIgnoreCase(uri.getScheme())) {// 如果是 content 類型的 UrifilePath = getDataColumn(context, uri, null, null);} else if ("file".equals(uri.getScheme())) {// 如果是 file 類型的 Uri,直接獲取圖片對應的路徑filePath = uri.getPath();}return filePath;}/*** 適配api19以下(不包括api19),根據uri獲取圖片的絕對路徑** @param context 上下文對象* @param uri 圖片的Uri* @return 如果Uri對應的圖片存在, 那么返回該圖片的絕對路徑, 否則返回null*/private static String getRealPathFromUriBelowAPI19 (Context context, Uri uri) {return getDataColumn(context, uri, null, null);}/*** 獲取數據庫表中的 _data 列，即返回Uri對應的文件路徑*/private static String getDataColumn (Context context, Uri uri, String selection, String[] selectionArgs) {String path = null;String[] projection = new String[]{MediaStore.Images.Media.DATA};Cursor cursor = null;try {cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);if (cursor != null && cursor.moveToFirst()) {int columnIndex = cursor.getColumnIndexOrThrow(projection[0]);path = cursor.getString(columnIndex);}} catch (Exception e) {if (cursor != null) {cursor.close();}}return path;}/*** @param uri the Uri to check* @return Whether the Uri authority is MediaProvider*/private 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 DownloadsProvider*/private static boolean isDownloadsDocument (Uri uri) {return "com.android.providers.downloads.documents".equals(uri.getAuthority());}private static boolean isExternalStorageDocument (Uri uri) {return "com.android.externalstorage.documents".equals(uri.getAuthority());} }

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總結

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