add the Requesting Permissions at Run Time , fix [#51](https://github.com/leanote/leanote-android/issues/51)

app/src/main/java/org/houxg/leamonax/ui/LaunchActivity.java

@@ -1,10 +1,18 @@
 package org.houxg.leamonax.ui;
 
+import android.Manifest;
 import android.animation.Animator;
 import android.app.Activity;
+import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v13.app.ActivityCompat;
+import android.support.v7.app.AlertDialog;
 import android.view.WindowManager;
+import android.widget.Toast;
 
 import org.houxg.leamonax.R;
 import org.houxg.leamonax.model.Account;
@@ -12,13 +20,56 @@ import org.houxg.leamonax.network.ApiProvider;
 import org.houxg.leamonax.service.AccountService;
 
 public class LaunchActivity extends Activity {
-
+    final int PERMISSIONS_REQUEST_CODE=19919;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                 WindowManager.LayoutParams.FLAG_FULLSCREEN);
         setContentView(R.layout.activity_launch);
+        if(Build.VERSION.SDK_INT >= 23){
+            if(hasPermission(
+                    Manifest.permission.CAMERA ,
+                    Manifest.permission.WRITE_EXTERNAL_STORAGE ,
+                    Manifest.permission.READ_EXTERNAL_STORAGE ,
+                    Manifest.permission.READ_PHONE_STATE
+            )){
+                doAfterGetPermission();
+            }else {
+                AlertDialog.Builder builder=new AlertDialog.Builder(LaunchActivity.this);
+                builder.setMessage(getString(R.string.permission_get_description));
+                builder.setTitle(getString(R.string.permission_denied));
+                builder.setPositiveButton(getString(R.string.allow), new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        requestPermission(PERMISSIONS_REQUEST_CODE,
+                                Manifest.permission.CAMERA ,
+                                Manifest.permission.WRITE_EXTERNAL_STORAGE ,
+                                Manifest.permission.READ_EXTERNAL_STORAGE ,
+                                Manifest.permission.READ_PHONE_STATE
+                        );
+                    }
+                });
+                builder.setNegativeButton(getString(R.string.cancel), new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        finish();
+                    }
+                });
+                builder.setCancelable(false).create().show();
+            }
+        }else {
+            doAfterGetPermission();
+        }
+
+    }
+
+    @Override
+    public void onBackPressed() {
+
+    }
+
+    private void doAfterGetPermission(){
         final Intent intent;
         if (AccountService.isSignedIn()) {
             Account account = Account.getCurrent();
@@ -55,8 +106,42 @@ public class LaunchActivity extends Activity {
                 }).start();
     }
 
-    @Override
-    public void onBackPressed() {
-
+    public boolean hasPermission(String... permissions){
+        for (String permission : permissions) {
+            if (ActivityCompat.checkSelfPermission(this, permission)
+                    != PackageManager.PERMISSION_GRANTED) {
+                return false;
+            }
+        }
+        return true;
     }
+
+    public void requestPermission(int requestCode, String... permissions) {
+        ActivityCompat.requestPermissions(this, permissions, requestCode);
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        switch (requestCode) {
+            case PERMISSIONS_REQUEST_CODE:
+                if(grantResults[0] == PackageManager.PERMISSION_GRANTED){
+                    if(hasPermission(Manifest.permission.CAMERA ,
+                            Manifest.permission.WRITE_EXTERNAL_STORAGE ,
+                            Manifest.permission.READ_EXTERNAL_STORAGE ,
+                            Manifest.permission.READ_PHONE_STATE )){
+                        doAfterGetPermission();
+                    }else {
+                        Toast.makeText(LaunchActivity.this,getString(R.string.permission_get_error),Toast.LENGTH_SHORT).show();
+                        finish();
+                    }
+                }else {
+                    Toast.makeText(LaunchActivity.this,getString(R.string.permission_get_error),Toast.LENGTH_SHORT).show();
+                    this.finish();
+                }
+            default:
+                break;
+        }
+    }
+
 }

app/src/main/res/values-zh/strings.xml

@@ -114,4 +114,8 @@
     <string name="notebook_default_root_notebook_title">空目录(最顶层目录)</string>
     <string name="delete_network_error">网络不可用，将在下次同步时删除</string>
     <string name="activity_search_note_not_found">没有找到</string>
+    <string name="permission_get_error">获取权限失败，程序启动失败</string>
+    <string name="permission_get_description">我们需要一些权限来启动应用，请给予我们这些应用。请放心，我们保证只会申请必要的权限，并保证绝不泄露用户隐私信息</string>
+    <string name="permission_get">权限申请</string>
+    <string name="allow">允许</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -116,4 +116,8 @@
     <string name="notebook_default_root_notebook_title">Empty directory</string>
     <string name="delete_network_error">Network is unavailable, these notes will be deleted in next sync</string>
     <string name="activity_search_note_not_found">Not found</string>
+    <string name="permission_get_error">Permission fetch failed, application exit</string>
+    <string name="permission_get_description">We need some permission to start the application</string>
+    <string name="permission_get">Permission request</string>
+    <string name="allow">allow</string>
 </resources>