編程-安卓，怎麼不能發送通知到狀態欄上？

安卓，怎麼不能發送通知到狀態欄上？

Email.java

 package com.examp.notificationdemof;

import java.io.Serializable;

public class Email implements Serializable{
    private String title,content;

    public Email(String title,String content)
    {
        this.title=title;
        this.content=content;
    }

    public String getTitle()
    {
        return title;
    }

    public void setTitle(String title)
    {
        this.title=title;
    }

    public String getContent()
    {
        return content;
    }

    public void setContent(String content)
    {
        this.content=content;
    }


}

EmailActivity.java

 package com.examp.notificationdemof;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class EmailActivity extends Activity{
    private TextView tvTitle=null;
    private TextView tvContent=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_email);
        tvTitle=(TextView)findViewById(R.id.tvTiTle);
        tvContent=(TextView)findViewById(R.id.tvContent);
        Bundle bundle=getIntent().getExtras();
        if (bundle==null)
            return;
        Email email=(Email)bundle.getSerializable("email");
        if (email!=null)
        {
            tvTitle.setText(email.getTitle());
            tvContent.setText(email.getContent());
        }
    }


}

MainActivity.java

 package com.examp.notificationdemof;

import android.app.Activity;
import android.app.Notification;
import android.app.Notification.Builder;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{
    private NotificationManager notificationManager;
    private Button bt1=null;
    private Button bt2=null;
    private final int NOTIFICATION_ID = 0x123;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        notificationManager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        bt1=(Button)findViewById(R.id.bt_send);
        bt1.setOnClickListener(this);
        bt2=(Button)findViewById(R.id.bt_cancel);
        bt2.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.bt_send:
            String title="Hello Android";
            String content="welcome to the Android world";
            Email email=new Email(title,content);
            Intent intent=new Intent(MainActivity.this,EmailActivity.class);
            Bundle bundle=new Bundle();
            bundle.putSerializable("email", email);
            intent.putExtras(bundle);
            startActivity(intent);
            PendingIntent pendingIntent=PendingIntent.getActivity(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            Builder builder=new Notification.Builder(this);
            builder.setTicker("You got a mail");
            builder.setContentTitle(email.getTitle());
            builder.setContentText(email.getContent());
            builder.setAutoCancel(true);
            builder.setContentIntent(pendingIntent);
            Notification notification=builder.build();
            notificationManager.notify(NOTIFICATION_ID,notification);
            break;
        case R.id.bt_cancel:
            notificationManager.cancel(NOTIFICATION_ID);
            break;
        default:break;
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

最佳回答：

這個是不是手機權限的問題，檢查一下通知權限。