点击按钮进入系统文件管理器

Intent intent =new Intent(Intent.ACTION_GET_CONTENT);

//intent.setType(“image/*”);//选择图片

//intent.setType(“audio/*”); //选择音频

//intent.setType(“video/*”); //选择视频 （mp4 3gp 是android支持的视频格式）

//intent.setType(“video/*;image/*”);//同时选择视频和图片

// intent.setType("*/*");//无类型限制

intent.setType("application/zip");//zip

// intent.setType("application/x-rar-compressed");//rar

intent.addCategory(Intent.CATEGORY_OPENABLE);

startActivityForResult(intent,RECORD_CLECK_CODE);

根据自己所需过滤文件类型

onActivityResult中接收结果

if (requestCode ==RECORD_CLECK_CODE && resultCode ==RESULT_OK) {

Uri uri = data.getData();

if ("file".equalsIgnoreCase(uri.getScheme())){//使用第三方应用打开

        path =uri.getPath();

tv_zip_url.setText(path);

Toast.makeText(this,path+"11111",Toast.LENGTH_SHORT).show();

return;

}

if (Build.VERSION.SDK_INT >Build.VERSION_CODES.KITKAT) {//4.4以后

        //  path = getPath(this, uri);//我的荣耀20拿不到，直接用了uri

// String path = getPath(this, uri);

        uritofileandroidQ = uriToFileApiQ(uri);

tv_zip_url.setText(uritofileandroidQ +"");

Toast.makeText(this,"file"+uritofileandroidQ,Toast.LENGTH_SHORT).show();

}else {//4.4以下下系统调用方法

        path = getRealPathFromURI(uri);

tv_zip_url.setText(path);

Toast.makeText(MainActivity.this,path+"222222",Toast.LENGTH_SHORT).show();

}

由于权限问题需要将uri转为file

@RequiresApi(api =Build.VERSION_CODES.Q)

public File uriToFileApiQ(Uri uri) {

File file =null;

//android10以上转换

    if (uri.getScheme().equals(ContentResolver.SCHEME_FILE)) {

file =new File(uri.getPath());

}else if (uri.getScheme().equals(ContentResolver.SCHEME_CONTENT)) {

//把文件复制到沙盒目录

        ContentResolver contentResolver =this.getContentResolver();

Cursor cursor =contentResolver.query(uri,null,null,null,null);

if (cursor.moveToFirst()) {

String displayName =cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));

try {

InputStream is =contentResolver.openInputStream(uri);

File cache =new File(this.getExternalCacheDir().getAbsolutePath(),Math.round((Math.random() +1) *1000) +displayName);

FileOutputStream fos =new FileOutputStream(cache);

FileUtils.copy(is,fos);

file =cache;

fos.close();

is.close();

}catch (IOException e) {

e.printStackTrace();

}

}

}

return file;

}

public String getRealPathFromURI(Uri contentUri) {

String res =null;

String[]proj = {MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(contentUri,proj,null,null,null);

if(null!=cursor&&cursor.moveToFirst()){;

int column_index =cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

res =cursor.getString(column_index);

cursor.close();

}

return res;

}

Android4.4以下

public String getRealPathFromURI(Uri contentUri) {

String res =null;

String[]proj = {MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(contentUri,proj,null,null,null);

if(null!=cursor&&cursor.moveToFirst()){;

int column_index =cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

res =cursor.getString(column_index);

cursor.close();

}

return res;

}

读取file放入byte[]中

private byte[]readFileToByteArray(String path) {

File file =new File(path);

FileInputStream in =null;

if(!file.exists()) {

Log.e(TAG,"File doesn't exist!");

return null;

}

try {

in =new FileInputStream(file);

long inSize = in.getChannel().size();//判断FileInputStream中是否有内容

        if (inSize ==0) {

Log.d(TAG,"The FileInputStream has no content!");

return null;

}

byte[]buffer =new byte[in.available()];//in.available() 表示要读取的文件中的数据长度

        in.read(buffer);//将文件中的数据读到buffer中

        return buffer;

}catch (FileNotFoundException e) {

e.printStackTrace();

return null;

}catch (IOException e) {

e.printStackTrace();

return null;

}finally {

try {

in.close();

}catch (IOException e) {

return null;

}

//或IoUtils.closeQuietly(in);

    }

}

这样就OK了！