获取通知栏信息

如何获取手机通知栏的消息？代码如下（比较懒就不解释了）：

service 代码：

@SuppressLint("OverrideAbstract")
public class MyNotifiService extends NotificationListenerService {

    private BufferedWriter bw;
    private SimpleDateFormat sdf;
    private MyHandler handler = new MyHandler();
    private String nMessage;
    private String data;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("KEVIN", "Service is started"+"-----");
        data = intent.getStringExtra("data");

        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onNotificationPosted(StatusBarNotification sbn) {
//        super.onNotificationPosted(sbn);
        try{
//有些通知不能解析出TEXT内容，这里做个信息能判断
            if (sbn.getNotification().tickerText != null){
                nMessage=sbn.getNotification().tickerText.toString();
                Log.i("KEVIN", "Get Message"+"-----"+nMessage);
                init();
                if(nMessage.contains(data)) {
                    Message message = handler.obtainMessage();
                    message.what = 1;
                    handler.sendMessage(message);
                    writeData(sdf.format(new Date(System.currentTimeMillis()))+":"+nMessage);
                }
            }
        } catch(Exception e){

            Toast.makeText(MyNotifiService.this,"不可解析的通知",Toast.LENGTH_SHORT).show();

        }

    }
    private void writeData(String str){
        try {
//            bw.newLine();
//            bw.write("NOTE");
            bw.newLine();
            bw.write(str);
            bw.newLine();
//            bw.newLine();
            bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void init(){
        sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try{
            FileOutputStream fos = new FileOutputStream(newFile(),true);
            OutputStreamWriter osw = new OutputStreamWriter(fos);
            bw = new BufferedWriter(osw);
        }catch(IOException e){
            Log.d("KEVIN","BufferedWriter Initialization error");
        }
        Log.d("KEVIN","Initialization Successful");
    }

    private File newFile() {
//        try {
        File fileDir = new File(Environment.getExternalStorageDirectory().getPath() + File.separator  + "ANotification");
        fileDir.mkdir();
        String basePath = Environment.getExternalStorageDirectory() + File.separator + "ANotification" + File.separator + "record.txt";
        return new File(basePath);

    }


    class MyHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case 1 :
//                    Toast.makeText(MyService.this,"Bingo",Toast.LENGTH_SHORT).show();
            }
        }

    }
}

MainActivity.java

public class MainActivity extends Activity {
    private Intent intent;
    private Button button;
    private Button button2;
    private Button button3;
    private EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button =findViewById(R.id.button);
        button2=findViewById(R.id.button2);
        button3=findViewById(R.id.button3);
        editText=findViewById(R.id.editText);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {//打开监听引用消息Notification access
                intent =new Intent(MainActivity.this, MyNotifiService.class);//启动服务
                intent.putExtra("data", editText.getText().toString());
                startService(intent);//启动服务

            }
        });
        button2.setOnClickListener(new View.OnClickListener(){
            @Override
            public  void onClick(View v){
                Intent intent_s=new Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS);
                startActivity(intent_s);
            }
        });
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent_p=new Intent(Settings.ACTION_APPLICATION_SETTINGS);
                startActivity(intent_p);

            }
        });
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.gionee.notificationmonitor">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <service
            android:name=".MyNotifiService"
            android:priority="1000"
            android:label="通知监控"       
            android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
            <intent-filter>
                <action      android:name="android.service.notification.NotificationListenerService" />
            </intent-filter>
        </service>
    </application>

</manifest>

界面如下(代码就不贴了)：