Question

大家好我想在我的应用程序中实现通知。问题是我希望每个通知都有可能从imageview获取某个图像。

由于documentation表示setSmallIcon()方法只能使用int resId作为参数，因此我必须使用setLargeIcon()方法。如何将来自URL的图像转换为位图？

已经尝试过：

Bitmap bmp = BitmapFactory.decodeFile(getIntent().getStringExtra("stockImage"));
builder.setLargeIcon(bmp);

它给了我错误：

02-15 11:34:34.576    1615-1615/com.kostas.stockpredictions E/BitmapFactory﹕ Unable to decode stream: java.io.FileNotFoundException: http:/www.chatapp.info/myProject/images/ALPHA.png: open failed: ENOENT (No such file or directory)

我使用Ion库将此url设置为Imageview：

iv = (ImageView)findViewById(R.id.currentStockImageViewItem);
Ion.with(iv).placeholder(R.drawable.ic_chat).error(R.drawable.ic_chat).load(i.getStringExtra("stockImage"));

修改

class GetBitmapUrl extends AsyncTask<String, Void, Bitmap>{

        @Override
        protected Bitmap doInBackground(String... params) {
            try {
                URL url = new URL(params[0]);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setDoInput(true);
                connection.connect();
                InputStream input = connection.getInputStream();
                Bitmap myBitmap = BitmapFactory.decodeStream(input);
                return myBitmap;
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
        }



        @Override
        protected void onPostExecute(Bitmap result) {
            builder.setLargeIcon(result);
        }
    }

    public void getBitmap(){
        GetBitmapUrl task = new GetBitmapUrl();
        task.execute(getIntent().getStringExtra("stockImage"));
    }

我在这里称这个方法：

Button notify = (Button)findViewById(R.id.buttonNotify);
                    notify.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            builder = new NotificationCompat.Builder(StockItem.this);
                            builder.setContentTitle(name);
                            builder.setContentText(getString(R.string.notifyText) + " " + new DecimalFormat("###.##").format(avg));
                            builder.setWhen(System.currentTimeMillis());
                            getBitmap();
                            //builder.setSmallIcon(R.drawable.ic_launcher_stock_custom_icon);
                            builder.setTicker(getString(R.string.notifyTicker));
                            builder.setSound(Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE
                                    + "://" + getPackageName() + "/raw/carme"));
                            builder.setDefaults(NotificationCompat.DEFAULT_LIGHTS | NotificationCompat.DEFAULT_VIBRATE);
                            builder.setAutoCancel(true);
                            Intent intent = new Intent(StockItem.this, ListLoaderActivity.class);
                            TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(StockItem.this);

                            taskStackBuilder.addNextIntent(intent);
                            taskStackBuilder.addParentStack(ListLoaderActivity.class);

                            PendingIntent pendingIntent = taskStackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
                            builder.setContentIntent(pendingIntent);
                            NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
                            manager.notify(1, builder.build());

                        }
                    });

现在通知没有显示..

是否可以在imageview中使用带有图像的位图？

提前致谢!!!

Answer 1

使用此代码

Notification notification = new Notification(R.drawable.images, getText(R.string.time),
                System.currentTimeMillis());
        Intent notificationIntent = new Intent(this, ActivityStart.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
        notification.setLatestEventInfo(this, "The Service has started",
               "This is a foreground service", pendingIntent);
        startForeground(3, notification);

要下载图像，请使用AsyncTask的doInBackgroundMethod中的以下代码。

  public Bitmap getBitmapFromURL(String strURL) {
    try {
        URL url = new URL(strURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

现在覆盖Asynctask中的onPostExecute方法，如下所示：

// change the return type of doInBackGround to InputStream
@Override
public void onPostExecute(InputStream in){
// let the bitmap in the activity be activityBitmap

 Bitmap activityBitmap = BitmapFactory.decodeStream(input);
}

一个例子是

class BitmapWorkerTask extends AsyncTask<Integer, Void, Bitmap> {
private final WeakReference<ImageView> imageViewReference;
private int data = 0;

public BitmapWorkerTask(ImageView imageView) {
    // Use a WeakReference to ensure the ImageView can be garbage collected
    imageViewReference = new WeakReference<ImageView>(imageView);
}

// Decode image in background.
@Override
protected Bitmap doInBackground(Integer... params) {
    data = params[0];
    return decodeSampledBitmapFromResource(getResources(), data, 100, 100));
}

// Once complete, see if ImageView is still around and set bitmap.
@Override
protected void onPostExecute(Bitmap bitmap) {
    if (imageViewReference != null && bitmap != null) {
        final ImageView imageView = imageViewReference.get();
        if (imageView != null) {
            imageView.setImageBitmap(bitmap);
        }
    }
}

}

Answer 2

自定义通知布局

通知框架允许您定义自定义通知布局，定义通知的外观一个RemoteViews对象。自定义布局通知类似于正常通知，但它们基于中定义的RemoteView XML布局文件。

自定义通知布局的可用高度取决于通知视图。普通视图布局限制为64 dp，和展开的视图布局限制为256 dp。

要定义自定义通知布局，请先实例化a 用于扩展XML布局文件的RemoteViews对象。然后，相反调用setContentTitle（）等方法，调用setContent（）。至在自定义通知中设置内容详细信息，请使用方法 RemoteViews用于设置视图子项的值：

在单独的文件中为通知创建XML布局。您可以使用您希望的任何文件名，但您必须使用扩展名.xml 在您的应用中，使用RemoteViews方法来定义通知图标和文字。将此RemoteViews对象放入您的 NotificationCompat.Builder通过调用 setContent（）。避免设置 background在您的RemoteViews对象上可绘制，因为您的文本颜色可能变得不可读。

有关详细信息，请转到 http://developer.android.com/guide/topics/ui/notifiers/notifications.html

如何从Imageview设置通知图标

2 个答案: