文章目录
什么是通知一个发送通知的栗子：Android 8.0不能弹出通知一个兼容8.0的栗子让通知常驻通知栏如何清除通知如何更新通知界面内容点击通知执行意图如何实现进度条的通知如何自定义通知的UI界面
什么是通知
通知是Android中Service与用户交互的一种方式（主要是Service）
一个发送通知的栗子：
private static final int NOTIFICATION_ID = 1001;
private void sendNotification() {
//1、NotificationManager
NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
/** 2、Builder->Notification
* 必要属性有三项
* 小图标，通过 setSmallIcon() 方法设置
* 标题，通过 setContentTitle() 方法设置
* 内容，通过 setContentText() 方法设置*/
Notification.Builder builder = new Notification.Builder(this);
builder.setContentInfo("Content info")
.setContentText("Content text")//设置通知内容
.setContentTitle("Content title")//设置通知标题
.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
.setSmallIcon(R.mipmap.ic_launcher_round)//不能缺少的一个属性
.setSubText("Subtext")
.setTicker("滚动消息......")
.setWhen(System.currentTimeMillis());//设置通知时间，默认为系统发出通知的时间，通常不用设置
Notification n = builder.build();
//3、manager.notify()
manager.notify(NOTIFICATION_ID,n);
}
运行在API22的手机上效果：
Android 8.0不能弹出通知
运行在API26的手机上怎么样呢…原来根本就不能弹出通知，填坑请戳下文： Notification Android8.0中无法发送通知，提示：No Channel found for pkg
一个兼容8.0的栗子
private static final int NOTIFICATION_ID = 1001;
private void sendNotification() {
//1、NotificationManager
NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
/** 2、Builder->Notification
* 必要属性有三项
* 小图标，通过 setSmallIcon() 方法设置
* 标题，通过 setContentTitle() 方法设置
* 内容，通过 setContentText() 方法设置*/
Notification.Builder builder = new Notification.Builder(this);
builder.setContentInfo("Content info")
.setContentText("Content text")//设置通知内容
.setContentTitle("Content title")//设置通知标题
.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
.setSmallIcon(R.mipmap.ic_launcher_round)//不能缺少的一个属性
.setSubText("Subtext")
.setTicker("滚动消息......")
.setWhen(System.currentTimeMillis());//设置通知时间，默认为系统发出通知的时间，通常不用设置
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("001","my_channel",NotificationManager.IMPORTANCE_DEFAULT);
channel.enableLights(true); //是否在桌面icon右上角展示小红点
channel.setLightColor(Color.GREEN); //小红点颜色
channel.setShowBadge(true); //是否在久按桌面图标时显示此渠道的通知
manager.createNotificationChannel(channel);
builder.setChannelId("001");
}
Notification n = builder.build();
//3、manager.notify()
manager.notify(NOTIFICATION_ID,n);
}
让通知常驻通知栏
//让通知常驻通知栏
builder.setOngoing(true);
或者
Notification n = builder.build();
n.flags = Notification.FLAG_NO_CLEAR;
如何清除通知
private void clearNotification() {
//单利的系统服务
NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
manager.cancel(NOTIFICATION_ID);
}
如何更新通知界面内容
private static final int NOTIFICATION_ID2 = 1002;
private int progress = 0;
private void sendNotification2() {
NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
Notification.Builder builder = new Notification.Builder(this);
builder.setContentTitle("音乐下载")
.setContentText("下载进度:"+progress+"%")
.setSmallIcon(R.mipmap.ic_launcher) ;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("002","download_channel",NotificationManager.IMPORTANCE_DEFAULT);
manager.createNotificationChannel(channel);
builder.setChannelId("002");
}
Notification n = builder.build();
manager.notify(NOTIFICATION_ID2,n);
progress+=10;
}
点击通知执行意图
sendNotification2方法修改如下：
Intent intent = new Intent(this,Main2Activity.class);
PendingIntent pi = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);
//给通知添加点击意图
builder.setContentIntent(pi);
如何实现进度条的通知
private void sendProgressNotification() {
final NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
final Notification.Builder builder = new Notification.Builder(this);
builder.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("进度")
.setContentText("进度...")
.setProgress(100,10,true);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("003","download_channel",NotificationManager.IMPORTANCE_DEFAULT);
manager.createNotificationChannel(channel);
builder.setChannelId("003");
}
Notification n = builder.build();
manager.notify(NOTIFICATION_ID3,n);
//每隔1秒更新进度条进度
//启动工作线程
new Thread(){
@Override
public void run() {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
for(int i=1;i<=10;i++){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//发通知
builder.setProgress(100,i*10,false);
Notification n = builder.build();
manager.notify(NOTIFICATION_ID3,n);
}
//更新通知内容
manager.cancel(NOTIFICATION_ID3);
builder.setProgress(0,0,false);
builder.setContentText("音乐下载完毕");
Notification n = builder.build();
manager.notify(NOTIFICATION_ID3,n);
}
}.start();
}
如何自定义通知的UI界面
public class NotificationActivity extends Activity implements View.OnClickListener{
private static final int NOTIFICATION_ID3 = 1003;
private static final int NOTIFICATION_ID4 = 1004;
Button button;
Button button2;
private MyReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_notification);
button = findViewById(R.id.button);
button.setOnClickListener(this);
button2 = findViewById(R.id.button2);
button2.setOnClickListener(this);
//动态注册广播接收器
receiver = new MyReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("ACTION_BUTTON_PAUSE_CLICKED");
this.registerReceiver(receiver,intentFilter);
}
class MyReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
Log.i("info","接收到了广播"+intent.getAction());
}
}
@Override
protected void onDestroy() {
this.unregisterReceiver(receiver);
super.onDestroy();
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.button:
sendProgressNotification();
break;
case R.id.button2:
sendCustomeNotification();
break;
}
}
public void sendCustomeNotification() {
NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
Notification.Builder builder = new Notification.Builder(this);
builder.setSmallIcon(R.mipmap.ic_launcher);
RemoteViews views = new RemoteViews(getPackageName(),R.layout.layout_notification);
//给views中的按钮添加点击意图
Intent intent = new Intent(this,NewsContentActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.btn_pre,pendingIntent);
//给中间按钮添加点击意图
Intent intent1 = new Intent("ACTION_BUTTON_PAUSE_CLICKED");
PendingIntent pendingIntent1 = PendingIntent.getBroadcast(this,0,intent1,PendingIntent.FLAG_UPDATE_CURRENT);
views.setOnClickPendingIntent(R.id.btn_pause,pendingIntent1);
builder.setContent(views);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("004","download_channel",NotificationManager.IMPORTANCE_DEFAULT);
manager.createNotificationChannel(channel);
builder.setChannelId("004");
}
Notification n = builder.build();
manager.notify(NOTIFICATION_ID4,n);
}
private void sendProgressNotification() {
final NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
final Notification.Builder builder = new Notification.Builder(this);
builder.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("进度")
.setContentText("进度...")
.setProgress(100,10,true);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("003","download_channel",NotificationManager.IMPORTANCE_DEFAULT);
manager.createNotificationChannel(channel);
builder.setChannelId("003");
}
Notification n = builder.build();
manager.notify(NOTIFICATION_ID3,n);
//每隔1秒更新进度条进度
//启动工作线程
new Thread(){
@Override
public void run() {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
for(int i=1;i<=10;i++){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//发通知
builder.setProgress(100,i*10,false);
Notification n = builder.build();
manager.notify(NOTIFICATION_ID3,n);
}
//更新通知内容
manager.cancel(NOTIFICATION_ID3);
builder.setProgress(0,0,false);
builder.setContentText("音乐下载完毕");
Notification n = builder.build();
manager.notify(NOTIFICATION_ID3,n);
}
}.start();
}
}
