创建工程

app/src/main/java/com/navinfo/omqs/FirstFragment.kt

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+package com.navinfo.omqs
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.navigation.fragment.findNavController
+import com.navinfo.omqs.databinding.FragmentFirstBinding
+
+/**
+ * A simple [Fragment] subclass as the default destination in the navigation.
+ */
+class FirstFragment : Fragment() {
+
+    private var _binding: FragmentFirstBinding? = null
+
+    // This property is only valid between onCreateView and
+    // onDestroyView.
+    private val binding get() = _binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        _binding = FragmentFirstBinding.inflate(inflater, container, false)
+        return binding.root
+
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        binding.buttonFirst.setOnClickListener {
+            findNavController().navigate(R.id.action_FirstFragment_to_SecondFragment)
+        }
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}

app/src/main/java/com/navinfo/omqs/SecondFragment.kt

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+package com.navinfo.omqs
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.navigation.fragment.findNavController
+import com.navinfo.omqs.databinding.FragmentSecondBinding
+
+/**
+ * A simple [Fragment] subclass as the second destination in the navigation.
+ */
+class SecondFragment : Fragment() {
+
+    private var _binding: FragmentSecondBinding? = null
+
+    // This property is only valid between onCreateView and
+    // onDestroyView.
+    private val binding get() = _binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        _binding = FragmentSecondBinding.inflate(inflater, container, false)
+        return binding.root
+
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        binding.buttonSecond.setOnClickListener {
+            findNavController().navigate(R.id.action_SecondFragment_to_FirstFragment)
+        }
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}

app/src/main/java/com/navinfo/omqs/ui/LoginActivity.kt

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+package com.navinfo.omqs.ui
+
+import android.os.Bundle
+import android.os.PersistableBundle
+import androidx.activity.viewModels
+import com.navinfo.omqs.databinding.ActivityLoginBinding
+
+class LoginActivity : PermissionsActivity() {
+
+    private lateinit var binding: ActivityLoginBinding
+    private val viewModel by viewModels<LoginActivityViewModel>()
+
+    override fun onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
+        super.onCreate(savedInstanceState, persistentState)
+        binding = ActivityLoginBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+    }
+
+    override fun onPermissionsGranted() {
+        initView()
+    }
+
+    private fun initView() {
+
+    }
+
+    override fun onPermissionsDenied() {
+    }
+
+}

app/src/main/java/com/navinfo/omqs/ui/LoginActivityViewModel.kt

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+package com.navinfo.omqs.ui
+
+import androidx.lifecycle.ViewModel
+
+class LoginActivityViewModel : ViewModel() {
+
+}

app/src/main/java/com/navinfo/omqs/ui/MainActivity.kt

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+package com.navinfo.omqs.ui
+
+import android.os.Bundle
+import com.google.android.material.snackbar.Snackbar
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.WindowCompat
+import androidx.navigation.findNavController
+import androidx.navigation.ui.AppBarConfiguration
+import androidx.navigation.ui.navigateUp
+import androidx.navigation.ui.setupActionBarWithNavController
+import android.view.Menu
+import android.view.MenuItem
+import com.navinfo.omqs.R
+import com.navinfo.omqs.databinding.ActivityMainBinding
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var appBarConfiguration: AppBarConfiguration
+    private lateinit var binding: ActivityMainBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        WindowCompat.setDecorFitsSystemWindows(window, false)
+        super.onCreate(savedInstanceState)
+
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        setSupportActionBar(binding.toolbar)
+
+        val navController = findNavController(R.id.nav_host_fragment_content_main)
+        appBarConfiguration = AppBarConfiguration(navController.graph)
+        setupActionBarWithNavController(navController, appBarConfiguration)
+
+        binding.fab.setOnClickListener { view ->
+            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+                .setAnchorView(R.id.fab)
+                .setAction("Action", null).show()
+        }
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        menuInflater.inflate(R.menu.menu_main, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        return when (item.itemId) {
+            R.id.action_settings -> true
+            else -> super.onOptionsItemSelected(item)
+        }
+    }
+
+    override fun onSupportNavigateUp(): Boolean {
+        val navController = findNavController(R.id.nav_host_fragment_content_main)
+        return navController.navigateUp(appBarConfiguration)
+                || super.onSupportNavigateUp()
+    }
+}

app/src/main/java/com/navinfo/omqs/ui/PermissionsActivity.kt

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+package com.navinfo.omqs.ui
+
+import android.os.Bundle
+import android.os.PersistableBundle
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import com.hjq.permissions.OnPermissionCallback
+import com.hjq.permissions.Permission
+import com.hjq.permissions.XXPermissions
+
+/**
+ * 权限申请Activity
+ */
+abstract class PermissionsActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
+        super.onCreate(savedInstanceState, persistentState)
+
+        XXPermissions.with(this)
+            // 申请单个权限
+            .permission(Permission.WRITE_EXTERNAL_STORAGE)
+            .permission(Permission.READ_EXTERNAL_STORAGE)
+            // 设置权限请求拦截器（局部设置）
+            //.interceptor(new PermissionInterceptor())
+            // 设置不触发错误检测机制（局部设置）
+            //.unchecked()
+            .request(object : OnPermissionCallback {
+
+                override fun onGranted(permissions: MutableList<String>, all: Boolean) {
+                    if (!all) {
+                        Toast.makeText(
+                            this@PermissionsActivity,
+                            "获取部分权限成功，但部分权限未正常授予",
+                            Toast.LENGTH_SHORT
+                        )
+                            .show()
+                        onPermissionsGranted()
+                        return
+                    }
+                    // 在SD卡创建项目目录
+                }
+
+                override fun onDenied(permissions: MutableList<String>, never: Boolean) {
+                    if (never) {
+                        Toast.makeText(
+                            this@PermissionsActivity,
+                            "永久拒绝授权,请手动授权文件读写权限",
+                            Toast.LENGTH_SHORT
+                        )
+                            .show()
+                        // 如果是被永久拒绝就跳转到应用权限系统设置页面
+                        XXPermissions.startPermissionActivity(this@PermissionsActivity, permissions)
+                        onPermissionsDenied()
+                    } else {
+                    }
+                }
+            })
+    }
+
+    abstract fun onPermissionsGranted()
+    abstract fun onPermissionsDenied()
+}