Question

我正在尝试使用通过字符串创建位图的函数为通知创建动态图标。

开始我的项目时，我想使用API级别22，但是我意识到 public Notification.Builder setSmallIcon（图标图标）在API 23之前不可用。所以我更改了MinSDKVersion，但仍然出现不兼容的类型错误...

package com.example.netmetah;
import android.app.IntentService;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Icon;
import android.net.Uri;
import android.support.v4.app.NotificationCompat;
import android.widget.Toast;
import android.app.Notification.Builder;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class NetMonitorService extends IntentService {

    public NetMonitorService() {
        super("NetMeterListening");
    }

    @Override
    protected void onHandleIntent(Intent workIntent) {
        Context context = getApplicationContext();
        CharSequence text = "Le service marche";
        int duration = Toast.LENGTH_SHORT;

        Toast toast = Toast.makeText(context, text, duration);
        toast.show();
        createNotification(createBitmapFromString("23","kb"));
    }

    private Bitmap createBitmapFromString(String speed, String units) {
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setTextSize(55);
        paint.setTextAlign(Paint.Align.CENTER);

        Paint unitsPaint = new Paint();
        unitsPaint.setAntiAlias(true);
        unitsPaint.setTextSize(40);
        unitsPaint.setTextAlign(Paint.Align.CENTER);

        Rect textBounds = new Rect();
        paint.getTextBounds(speed, 0, speed.length(), textBounds);

        Rect unitsTextBounds = new Rect();
        unitsPaint.getTextBounds(units, 0, units.length(), unitsTextBounds);

        int width = (textBounds.width() > unitsTextBounds.width()) ? textBounds.width() : unitsTextBounds.width();

        Bitmap bitmap = Bitmap.createBitmap(width + 10, 90,
                Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmap);
        canvas.drawText(speed, width / 2 + 5, 50, paint);
        canvas.drawText(units, width / 2, 90, unitsPaint);

        return bitmap;
    }

    public static long[] readProc() {
        BufferedReader br;
        String line;
        String[] lines;
        long rx = 0;
        long tx = 0;
        try {
            br = new BufferedReader(new FileReader("/proc/net/dev"));
            while ((line = br.readLine()) != null) {
                if (line.contains("eth") || line.contains("wlan")) {
                    lines = line.trim().split("\\s+");
                    rx += Long.parseLong(lines[1]);
                    tx += Long.parseLong(lines[9]);
                }
            }
            br.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        long[] bytes = {rx, tx};
        return bytes;
    }

    private void createNotification(Bitmap icon) {
        Intent notificationIntent = new Intent(Intent.ACTION_VIEW);
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        notificationIntent.setData(Uri.parse("http://www.google.ca"));
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

        Notification notification = new NotificationCompat.Builder(this, "fuck")
                .setCategory(Notification.CATEGORY_PROMO)
                .setSmallIcon(Icon.createWithBitmap(icon))
                .setContentTitle("C'est quoi un titre")
                .setContentText("C'est quoi un text")
                .setAutoCancel(true)
                .setVisibility(1) //Public
                .addAction(android.R.drawable.ic_menu_view, "View details", contentIntent)
                .setContentIntent(contentIntent)
                .setPriority(Notification.PRIORITY_HIGH)
                .setChannelId("fuck")
                .setVibrate(new long[]{1000, 1000, 1000, 1000, 1000}).build();
        NotificationManager notificationManager =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        notificationManager.notify(123, notification);

    }
}

Answer 1

您正在使用NotificationCompat.Builder。根据{{3}}，setSmallIcon方法采用可绘制的资源ID。

很容易将其与Notification.Builder的方法混淆，其中一种方法具有可绘制的资源ID，而另一种方法则具有Icon。

不兼容的类型：图标无法转换为int

1 个答案: