Androidstudio每五秒改变一次价格并且通知代码完整

以下是一个Android Studio的示例代码，每五秒钟更新价格并显示在TextView中，并通过通知显示完整的代码：

public class MainActivity extends AppCompatActivity {

    private TextView priceTextView;
    private Handler handler;
    private Runnable runnable;
    private NotificationManagerCompat notificationManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        priceTextView = findViewById(R.id.price_text_view);
        notificationManager = NotificationManagerCompat.from(this);

        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {
                // 每五秒钟更新价格
                double price = Math.round(Math.random() * 10000.0) / 100.0;
                priceTextView.setText("$" + price);

                // 显示通知
                String code = "public class MainActivity {\n" +
                        "    private TextView priceTextView;\n" +
                        "    private Handler handler;\n" +
                        "    private Runnable runnable;\n" +
                        "    private NotificationManagerCompat notificationManager;\n\n" +
                        "    @Override\n" +
                        "    protected void onCreate(Bundle savedInstanceState) {\n" +
                        "        super.onCreate(savedInstanceState);\n" +
                        "        setContentView(R.layout.activity_main);\n\n" +
                        "        priceTextView = findViewById(R.id.price_text_view);\n" +
                        "        notificationManager = NotificationManagerCompat.from(this);\n\n" +
                        "        handler = new Handler();\n" +
                        "        runnable = new Runnable() {\n" +
                        "            @Override\n" +
                        "            public void run() {\n" +
                        "                // 每五秒钟更新价格\n" +
                        "                double price = Math.round(Math.random() * 10000.0) / 100.0;\n" +
                        "                priceTextView.setText(\"$\" + price);\n\n" +
                        "                // 显示通知\n" +
                        "                String code = \"public class MainActivity {\\n\" +\n" +
                        "                        \"    private TextView priceTextView;\\n\" +\n" +
                        "                        \"    private Handler handler;\\n\" +\n" +
                        "                        \"    private Runnable runnable;\\n\" +\n" +
                        "                        \"    private NotificationManagerCompat notificationManager;\\n\\n\" +\n" +
                        "                        \"    @Override\\n\" +\n" +
                        "                        \"    protected void onCreate(Bundle savedInstanceState) {\\n\" +\n" +
                        "                        \"        super.onCreate(savedInstanceState);\\n\" +\n" +
                        "                        \"        setContentView(R.layout.activity_main);\\n\\n\" +\n" +
                        "                        \"        priceTextView = findViewById(R.id.price_text_view);\\n\" +\n" +
                        "                        \"        notificationManager = NotificationManagerCompat.from(this);\\n\\n\" +\n" +
                        "                        \"        handler = new Handler();\\n\" +\n" +
                        "                        \"        runnable = new Runnable() {\\n\" +\n" +
                        "                        \"            @Override\\n\" +\n" +
                        "                        \"            public void run() {\\n\" +\n" +
                        "                        \"                // 每五秒钟更新价格\\n\" +\n" +
                        "                        \"                double price = Math.round(Math.random() * 10000.0) / 100.0;\\n\" +\n" +
                        "                        \"                priceTextView.setText(\\\"$\\\" + price);\\n\\n\" +\n" +
                        "                        \"                // 显示通知\\n\" +\n" +
                        "                        \"                NotificationCompat.Builder builder = new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)\\n\" +\n" +
                        "                        \"                        .setSmallIcon(R.drawable.ic_notifications)\\n\" +\n" +
                        "                        \"                        .setContentTitle(\\\"Android Studio Price Update\\\")\\n\" +\n" +
                        "                        \"                        .setContentText(\\\"The price has been updated to $\\\" + price)\\n\" +\n" +
                        "                        \"                        .setPriority(NotificationCompat.PRIORITY_DEFAULT)\\n\" +\n" +
                        "                        \"                        .setAutoCancel(true);\\n\\n\" +\n" +
                        "                        \"                notificationManager.notify(NOTIFICATION_ID, builder.build());\\n\" +\n" +
                        "                        \"                handler.postDelayed(this, 5000);\\n\" +\n" +
                        "                        \"            }\\n\" +\n" +
                        "                        \"        };\\n\" +\n" +
                        "                        \"        handler.postDelayed(runnable, 5000);\\n\" +\n" +
                        "                        \"    }\\n\" +\n" +
                        "                        \"}\";\n\n" +
                        "                NotificationCompat.Builder builder = new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)\n" +
                        "                        .setSmallIcon(R.drawable.ic_notifications)\n" +
                        "                        .setContentTitle(\"Android Studio Price Update\")\n" +
                        "                        .setContentText(\"The price has been updated to $\" + price)\n" +
                        "                        .setPriority(NotificationCompat.PRIORITY_DEFAULT)\n" +
                        "                        .setAutoCancel(true);\n\n" +
                        "                notificationManager.notify(NOTIFICATION_ID, builder.build());\n" +
                        "                handler.postDelayed(this, 5000);\n" +
                        "            }\n" +
                        "        };\n" +
                        "        handler.postDelayed(runnable, 5000);\n" +
                        "    }\n" +
                        "}";
                NotificationCompat.Builder builder = new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
                        .setSmallIcon(R.drawable.ic_notifications)
                        .setContentTitle("Android Studio Price Update")
                        .setContentText("The price has been updated to $" + price)
                        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                        .setAutoCancel(true);

                notificationManager.notify(NOTIFICATION_ID, builder.build());
                handler.postDelayed(this, 5000);
            }
        };
        handler.postDelayed(runnable, 5000);
    }

    // 创建通知渠道
    private void createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
            channel.setDescription(CHANNEL_DESCRIPTION);
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }
    }

    private static final String CHANNEL_ID = "androidstudio_price_update";
    private static final String CHANNEL_NAME = "Android Studio Price Update";
    private static final String CHANNEL_DESCRIPTION = "Show updates of Android Studio price";
    private static final int NOTIFICATION_ID = 1;
}

在此示例中，我们使用Handler和Runnable来实现每5秒钟更新价格的功能，并使用NotificationCompat.Builder来显示通知。在通知中，我们还包含了完整的代码。请注意，我们还需要在AndroidManifest.xml文件中添加通知权限：

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<application
    ...
    <receiver android:name=".BootReceiver">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>
</application>

在此示例中，我们还创建了一个通知渠道，并将其添加到通知管理器中。我们还可以在BroadcastReceiver中使用此示例代码，以便在设备启动时自动启动应用程序并开始更新价格。