Trung tâm Tin học – ĐH KHTN
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=" /> 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"
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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=" /> 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"
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Trung tâm Tin học – ĐH KHTN
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=" /> 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;
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Trung tâm Tin học – ĐH KHTN
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=" /> 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;
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Trung tâm Tin học – ĐH KHTN
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;
}
}
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}
};
}
Và hình ảnh của ứng dụng sau khi hoàn thành:
Các bạn nào muốn đóng góp trao đổi vui lòng post bài vào mục diễn đàn trên trang
.
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