增加通知

.idea/deploymentTargetDropDown.xml

@@ -2,24 +2,8 @@
 <project version="4">
   <component name="deploymentTargetDropDown">
     <value>
-      <entry key="MainActivity">
-        <State />
-      </entry>
       <entry key="app">
-        <State>
+        <State />
-          <targetSelectedWithDropDown>
-            <Target>
-              <type value="QUICK_BOOT_TARGET" />
-              <deviceKey>
-                <Key>
-                  <type value="VIRTUAL_DEVICE_PATH" />
-                  <value value="$USER_HOME$/.android/avd/Resizable_Experimental_API_34.avd" />
-                </Key>
-              </deviceKey>
-            </Target>
-          </targetSelectedWithDropDown>
-          <timeTargetWasSelectedWithDropDown value="2024-03-14T04:14:17.825894651Z" />
-        </State>
       </entry>
     </value>
   </component>

.idea/misc.xml

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">

app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
-
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"

app/src/main/java/uk/kagurach/android101/MainActivity.java

@@ -1,13 +1,18 @@
 package uk.kagurach.android101;
 
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.view.View;
 import android.widget.TextView;
+import android.Manifest;
 
 import androidx.activity.EdgeToEdge;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
 import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
@@ -24,6 +29,12 @@ public class MainActivity extends AppCompatActivity {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
             return insets;
         });
+        if (Build.VERSION.SDK_INT >= 33) {
+            if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
+                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.POST_NOTIFICATIONS}, 101);
+            }
+        }
+
     }
 
     @Override

app/src/main/java/uk/kagurach/android101/MainActivity2.java

@@ -28,7 +28,6 @@ public class MainActivity2 extends AppCompatActivity {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
             return insets;
         });
-        Log.d("K","2");
     }
 
     @Override
@@ -73,7 +72,10 @@ public class MainActivity2 extends AppCompatActivity {
         if (_r>=0&&_g>=0&&_b>=0&&_r<=255&&_g<=255&&_b<=255){
             t.setTextColor(Color.rgb(_r,_g,_b));
         }else{
-            Log.e("page2.setcolor","wrong color");
+            NotificationHelper helper =  new NotificationHelper(this);
+            helper.createNotificationChannel();
+            helper.pushNotification("Page 2: Error Setting Color",
+                    "The color: R="+_r+" G="+_g+" B="+_b+" is invalid!");
         }
 
     }

app/src/main/java/uk/kagurach/android101/NotificationHelper.kt

@@ -0,0 +1,67 @@
+package uk.kagurach.android101
+
+import android.Manifest
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.content.Context
+import android.content.pm.PackageManager
+import androidx.core.app.ActivityCompat
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import androidx.core.content.ContextCompat.getSystemService
+import kotlin.random.Random
+
+class NotificationHelper(_ctx: Context) {
+    val CHANNEL_ID = "DBG_PUSHER"
+    val name = "Debug Pusher"
+    var ctx: Context = _ctx
+    var notifyID = 1;
+    var rng = Random(114514);
+    private val notificationManager =
+        getSystemService(ctx,NotificationManager::class.java) as NotificationManager
+
+    public fun pushNotification(title:String,content:String) {
+        val builder = NotificationCompat.Builder(ctx, CHANNEL_ID)
+            .setSmallIcon(R.drawable.ic_launcher_foreground)
+            .setContentTitle(title)
+            .setContentText(content)
+            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+            .setAutoCancel(true)
+            .setStyle(NotificationCompat.BigTextStyle()
+                .bigText(content))
+
+        with(NotificationManagerCompat.from(ctx)) {
+            if (ActivityCompat.checkSelfPermission(
+                    ctx,
+                    Manifest.permission.POST_NOTIFICATIONS
+                ) != PackageManager.PERMISSION_GRANTED
+            ) {
+                return
+            }
+            notify(notifyID, builder.build())
+            val lastNotifyID = notifyID;
+            while (notifyID==lastNotifyID){
+                notifyID = rng.nextInt()
+                if (notifyID<=0){
+                    notifyID = -notifyID
+                    notifyID += 1
+                }
+                rng = Random(notifyID)
+            }
+        }
+    }
+
+
+    protected fun createNotificationChannel() {
+        // Create the NotificationChannel, but only on API 26+ because
+        // the NotificationChannel class is not in the Support Library.
+        val importance = NotificationManager.IMPORTANCE_DEFAULT
+        val channel = NotificationChannel(CHANNEL_ID, name, importance).apply {}
+        // Register the channel with the system.
+        notificationManager.createNotificationChannel(channel)
+    }
+
+    protected fun deleteNotificationChannel(){
+        notificationManager.deleteNotificationChannel(CHANNEL_ID)
+    }
+}

app/src/main/java/uk/kagurach/android101/Page3.java

@@ -9,7 +9,6 @@ import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
 
 public class Page3 extends AppCompatActivity {
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -21,4 +20,5 @@ public class Page3 extends AppCompatActivity {
             return insets;
         });
     }
+
 }