小编Co *_*der的帖子

我想开发一个应用程序,可以接收有关正在安装或删除的其他应用程序的广播.到目前为止,我尝试了下面的代码,但是,它仅在删除安装时提供广播事件,它不提供有关安装或删除的其他应用程序beibg的信息.那么,有没有办法获取新安装的应用程序的包名称.

在表现:

receiver android:name=".apps.AppListener">
    <intent-filter android:priority="100">
         <action android:name="android.intent.action.PACKAGE_INSTALL"/>
         <action android:name="android.intent.action.PACKAGE_ADDED"/>  
         <action android:name="android.intent.action.PACKAGE_REMOVED"/>
         <data android:scheme="package"/> 
    </intent-filter>
</receiver>

在AppListener中:

public class AppListener extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
      // there is a broadcast event here
      // but how to get the package name of the newly installed application 
      Log.v(TAG, "there is a broadcast");
    }
}

增加: 对于Api 14或更高版本,不推荐使用此功能.

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

下面，我有绘制李克特图的 R 代码。

set.seed(1234)
library(e1071)
probs <- cbind(c(.4,.2/3,.2/3,.2/3,.4),c(.1/4,.1/4,.9,.1/4,.1/4),c(.2,.2,.2,.2,.2))
my.n <- 100
my.len <- ncol(probs)*my.n
raw <- matrix(NA,nrow=my.len,ncol=2)
raw <- NULL
for(i in 1:ncol(probs)){
  raw <- rbind(raw, cbind(i,rdiscrete(my.n,probs=probs[,i],values=1:5)))
}

r <- data.frame( cbind(
  as.numeric( row.names( tapply(raw[,2], raw[,1], mean) ) ),
  tapply(raw[,2], raw[,1], mean),
  tapply(raw[,2], raw[,1], mean) + sqrt( tapply(raw[,2], raw[,1], var)/tapply(raw[,2], raw[,1], length) ) * qnorm(1-.05/2,0,1),
  tapply(raw[,2], raw[,1], mean) - sqrt( tapply(raw[,2], raw[,1], var)/tapply(raw[,2], raw[,1], length) ) * qnorm(1-.05/2,0,1)
))
names(r) <- c("group","mean","ll","ul")

gbar <- tapply(raw[,2], list(raw[,2], raw[,1]), length)

sgbar <- …

我有一个主要活动类并找到课程.我需要从find类访问主要活动变量的变量,即"name".我尝试使用下面的代码段访问但我收到错误.如何从其他类访问主要活动变量？

public class main extends Activity {

     public static String name=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button button1=(Button)findViewById(R.id.button1);

        final EditText edittext = (EditText) findViewById(R.id.editText1);

        button1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                name=edittext.getText().toString();

            }
        });                                                
}

我的第二课......

public class find {

public void finder(){

    main mainactivity=new main();
    String incoming_name =mainactivity.name;//I can not use like that ? 
            // do something 
}

}

public class test extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);

        String extra = "test";

        NotificationManager myNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

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

        Notification notification = new Notification(R.drawable.ic_launcher, extra, 
                System.currentTimeMillis());
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 
                0,
                intent,
                PendingIntent.FLAG_UPDATE_CURRENT);

        notification.setLatestEventInfo(getApplicationContext(), "title", "text", pendingIntent);


        notification.defaults|= Notification.DEFAULT_SOUND;
        notification.defaults|= Notification.DEFAULT_LIGHTS;
        notification.defaults|= Notification.DEFAULT_VIBRATE;
        notification.flags |= Notification.FLAG_INSISTENT;
        notification.flags |= Notification.FLAG_AUTO_CANCEL;

        myNotificationManager.notify(1, notification);
    }
}

这段代码工作正常,事情是,当我运行它时,通知声音不断响起,直到我在状态栏上检查它.有没有办法让它只响一次,而不是不断响？

Cursor cursor = db.rawQuery("SELECT id,lastname FROM people WHERE lastname=null; ",null);

此查询不返回lastname为空的成员.该查询有什么问题？我应该检查那个WHERE lastname =""吗？