Android弹出屏幕，例如WhatsApp或Telegram中的屏幕

Question

我是Android开发的新手。我为此搜索了很多，但找不到任何正确的答案。我想制作一个弹出/对话框屏幕，该屏幕在服务中发生时会显示。

手机锁定时也应提供此屏幕。我已经发现，您可以在对话样式或具有透明背景的活动中进行活动。但是我认为这不是正确的方法。这是其中一个屏幕（右图）：链接

您可以滚动浏览所有消息并响应所有消息。我的调试电话具有Android 4.0.2（因此是API级别14），我希望它用作我的应用的最低要求。

编辑：感谢您的答复，但我已经测试了通知。问题是，仅在通知栏中显示了小型孔。我没有带有标题或内容的通知窗口或弹出窗口...所以这是我的实现：

import com.google.android.gms.gcm.GoogleCloudMessaging;
import android.app.IntentService;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.TaskStackBuilder;
import android.util.Log;
public class GcmIntentService extends IntentService {
    public static final int NOTIFICATION_ID = 1;

    public GcmIntentService() {
        super("GcmIntentService");
    }
    public static final String TAG = "GCM test";
    @Override
    protected void onHandleIntent(Intent intent) {
        GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
        String messageType = gcm.getMessageType(intent);
        if (!intent.getExtras().isEmpty()) {  // has effect of unparcelling Bundle
            if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
                sendNotification("Send error: " + intent.getExtras().toString());
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED.equals(messageType)) {
                sendNotification("Deleted messages on server: " + intent.getExtras().toString());
                // If it's a regular GCM message, do some work.
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(messageType)) {
                // Post notification of received message.
                sendNotification("message:n" + intent.getStringExtra("message"));
                Log.i(TAG, "Received: " + intent.getExtras().toString());
            }
        }
        // Release the wake lock provided by the WakefulBroadcastReceiver.
        GcmBroadcastReceiver.completeWakefulIntent(intent);
    }
    private void sendNotification(String msg) {
        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_check)
                        .setContentTitle("My notification")
                        .setContentText(msg);
        Intent resultIntent = new Intent(this, PopupMessageActivity.class);
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
        stackBuilder.addParentStack(PopupMessageActivity.class);
        stackBuilder.addNextIntent(resultIntent);
        PendingIntent resultPendingIntent =
                stackBuilder.getPendingIntent(
                        0,
                        PendingIntent.FLAG_UPDATE_CURRENT
                );
        mBuilder.setContentIntent(resultPendingIntent);
        NotificationManager mNotificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
    }
}

Answer 1

通知是您要寻找的

这是指向Android开发人员页面的链接：http://developer.android.com/guide/topics/ui/notifiers/notifications.html

吐司也可能对您有所帮助：http://developer.android.com/guide/topics/ui/notifiers/toasts.html

祝你好运！

Answer 2

您正在谈论在lockscreen上运行的应用程序小部件..所以你可以阅读此页面并使用此页https://developer.android.com/guide/topics/appwidgets/index.html