增加sample里面申请动态权限

sample/src/main/java/me/kareluo/imaging/sample/MainActivity.kt

@@ -1,30 +1,69 @@
 package me.kareluo.imaging.sample
 
+import android.Manifest
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
+import android.widget.Toast
 import kotlinx.android.synthetic.main.activity_main.*
 
 const val REQ_IMAGE_EDIT = 1
 
 const val REQ_IMAGE_CHOOSE = 2
 
+const val REQ_PERMISSION_GALLERY_STORE = 3
+
+const val REQ_PERMISSION_EDIT_STORE = 4
+
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
         sdv_image_edit.setOnClickListener {
+            toEditActivity()
+        }
+
+        sdv_image_album.setOnClickListener {
+            toGalleryActivity()
+        }
+    }
+
+    private fun toEditActivity() {
+        if (PermissionUtil.checkOrRequestPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE, REQ_PERMISSION_EDIT_STORE)) {
             startActivity(Intent(
                     this, ImageEditSampleActivity::class.java
             ))
         }
+    }
 
-        sdv_image_album.setOnClickListener {
+    private fun toGalleryActivity() {
+        if (PermissionUtil.checkOrRequestPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE, REQ_PERMISSION_EDIT_STORE)) {
             startActivity(Intent(
                     this, GallerySampleActivity::class.java
             ))
         }
     }
+
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        when (requestCode) {
+            REQ_PERMISSION_EDIT_STORE -> {
+                if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                    toEditActivity()
+                } else {
+                    Toast.makeText(this, "请打开存储权限", Toast.LENGTH_SHORT).show()
+                }
+            }
+            REQ_PERMISSION_GALLERY_STORE -> {
+                if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                    toGalleryActivity()
+                } else {
+                    Toast.makeText(this, "请打开存储权限", Toast.LENGTH_SHORT).show()
+                }
+            }
+        }
+    }
 }

sample/src/main/java/me/kareluo/imaging/sample/PermissionUtil.java

@@ -0,0 +1,21 @@
+package me.kareluo.imaging.sample;
+
+import android.app.Activity;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
+
+public class PermissionUtil {
+
+    public static boolean checkOrRequestPermission(Activity activity, String permission, int requestCode) {
+        boolean hasPermission = true;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            if (ContextCompat.checkSelfPermission(activity, permission) != PackageManager.PERMISSION_GRANTED) {
+                ActivityCompat.requestPermissions(activity, new String[]{permission}, requestCode);
+                hasPermission = false;
+            }
+        }
+        return hasPermission;
+    }
+}