Lập trình Android: Notification docx

Tạo “Notification”Sau đây mình sẽ tạo 1 demo nho nhỏ để tạo các Notice nhắc nhở trên Android: Đầu tiên các bạn tạo 1 project như sau: Project name: NotificationExample Build Target: Andr

Tạo “Notification”

Sau đây mình sẽ tạo 1 demo nho nhỏ để tạo các Notice (nhắc nhở trên Android):

Đầu tiên các bạn tạo 1 project như sau:

Project name: NotificationExample

Build Target: Android 2.3.3

Application name: NotificationExample

Package name: org.example NotificationExample

Create Activity: NotificationExample

Sau đó các bạn chỉnh sửa strings.xml như sau:

<?xml version="1.0" encoding="utf-8"?>

<resources>

<string name="hello">Hello World, NotificationExample!</string>

<string name="app_name">NotificationExample</string>

<string name="info">Notification Example, press the button Notification to add a notification.</string>

<string name="btn_default_notification_text">Show Notification</string>

<string name="notification_string">This is the activity started when you press the notification.</string>

</resources>

Tiếp theo các bạn chỉnh sửa file main.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<LinearLayout

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="0.9">

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:gravity="center_vertical|center_horizontal"

android:text="@string/info"/>

</LinearLayout>

<LinearLayout

android:orientation="horizontal"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="0.1"

android:gravity="bottom|center_horizontal">

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:id="@+id/btn_default_notification"

android:text="@string/btn_default_notification_text"/>

</LinearLayout>

</LinearLayout>

Các bạn tạo thêm file customlayout có nội dung:

<?xml version="1.0" encoding="UTF-8"?>

<LinearLayout xmlns:android= http://schemas.android.com/apk/res/android "

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal">

<ImageView

android:id="@+id/custom_view_image"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:layout_weight="0.1"

android:src="@drawable/icon"

android:scaleType="fitCenter">

</ImageView>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical"

android:gravity="center_vertical"

android:layout_marginTop="5dp"

android:layout_marginBottom="5dp"

android:layout_weight="0.9">

<TextView

android:id="@+id/custom_view_text"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="0.9"

android:gravity="center_vertical"

android:text="Sample message"

android:textColor="#000">

</TextView>

<ProgressBar

style="?android:attr/progressBarStyleHorizontal"

android:id="@+id/custom_view_progress"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="0.9"

android:max="100"

android:gravity="center_vertical">

</ProgressBar>

</LinearLayout>

</LinearLayout>

Tiếp theo các bạn tạo file notification_viewer.xml có nội dung:

<?xml version="1.0" encoding="UTF-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<LinearLayout

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_weight="0.9">

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:gravity="center_vertical|center_horizontal"

android:text="@string/notification_string"/>

</LinearLayout>

</LinearLayout>

Tiếp theo các bạn them vào package file Constants.java:

package org.example.NotificationExample;

public interface Constants {

public static final int NOTIFICATION_ID = 10001;

static final int PROGRESS_MAX = 100;

}

Và thêm tiếp file NotofocationViewer.java:

package org.example.NotificationExample;

import android.app.Activity;

import android.app.NotificationManager;

import android.content.Context;

import android.os.Bundle;

public class NotificationViewer extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.notification_viewer);

NotificationManager notificationManager =

(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

notificationManager.cancel(Constants.NOTIFICATION_ID);

}

}

Để sử dụng Activity này các bạn chỉnh sửa file AndroidManifest.xml như sau:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="org.example.NotificationExample"

android:versionCode="1"

android:versionName="1.0">

<uses-sdk android:minSdkVersion="8" />

<application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".NotificationExample"

android:label="@string/app_name">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" /> </intent-filter>

</activity>

<activity android:name=".NotificationViewer"/>

</application>

<uses-permission android:name="android.permission.VIBRATE"></uses-permission>

</manifest>

Cuối cùng các bạn chỉnh sữa file NotificationExample.java như sau:

package org.example.NotificationExample;

import android.app.Activity;

import android.os.Bundle;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.Context;

import android.content.Intent;

import android.graphics.Color;

import android.view.View;

import android.widget.Button;

public class NotificationExample extends Activity {

/** Called when the activity is first created */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

((Button)findViewById(R.id.btn_default_notification)).setOnClickListener(btnClick); }

private void addDefaultNotification(){

NotificationManager notificationManager =

(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

int icon = R.drawable.icon;

CharSequence text = "Notification Text";

CharSequence contentTitle = "Notification Title";

CharSequence contentText = "Sample notification text.";

long when = System.currentTimeMillis();

Intent intent = new Intent(this, NotificationViewer.class);

PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, 0);

Notification notification = new Notification(icon,text,when);

long[] vibrate = {0,100,200,300};

notification.vibrate = vibrate;

notification.ledARGB = Color.RED;

notification.ledOffMS = 300;

notification.ledOnMS = 300;

notification.defaults |= Notification.DEFAULT_LIGHTS;

//notification.flags |= Notification.FLAG_SHOW_LIGHTS;

notification.setLatestEventInfo(this, contentTitle, contentText,

contentIntent);

notificationManager.notify(Constants.NOTIFICATION_ID, notification);

}

private final View.OnClickListener btnClick = new View.OnClickListener() {

@Override

public void onClick(View v) {

switch(v.getId())

{

case R.id.btn_default_notification:

{

addDefaultNotification();

break;

}

}

}

};

}

Và hình ảnh của ứng dụng sau khi hoàn thành:

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