[Android]訊息:Log, Toast, notify

debug時加入訊息可以幫助瞭解程式運行情形
android SDK中提供了Log類別輸出訊息

Log.v("log_msg", "verbose: this is debug_message");
Log.d("log_msg", "debug:   this is debug_message");
Log.i("log_msg",  "info:    this is debug_message");
Log.w("log_msg", "warn:    this is debug_message");
Log.e("log_msg", "error:   this is debug_message");

Log類別中的訊息有五種 , 可以根據重要程度自行決定該使用哪一種
在Eclipse的Logcat視窗中  , 就能夠看到這些訊息
並且不同訊息有著不同的顏色:

利用Toast也能輸出訊息, 而且這些訊息可以直接顯示在螢幕上面
除了文字以外, Layout也能透過Toast顯示
第一種方法:(直接秀文字)

Toast toast2=Toast.makeText(this, "This is a toast msg", Toast.LENGTH_LONG);

toast2.setGravity(Gravity.CENTER_HORIZONTAL, 5, -5);

toast2.show();

第二種方法:(顯示layout)

LayoutInflater inflater= getLayoutInflater();

View toastLayout = inflater.inflate(R.layout.toast_robot,                                    (ViewGroup)findViewById(R.id.toast_robot_id)  );

Toast toast3=new Toast(this);

toast3.setGravity(Gravity.CENTER, 0, 0);

toast3.setDuration(Toast.LENGTH_LONG);

toast3.setView(toastLayout);

toast3.show();

另外也能夠在status bar顯示訊息
這種訊息一定要包含:  小圖, Title, 訊息文字,如下圖

(此圖片截自官網)
Code部分:

Context context= getApplicationContext();

CharSequence ttile = "提醒的標題";

CharSequence ttext2 = "點擊進入詳細內容";

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)

                                     .setSmallIcon(R.drawable.ic_launcher)

                                     .setContentTitle(ttile)

                                     .setContentText(ttext2); 

Intent resultIntent = new Intent(this, notify_activity.class); 

TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); 

// Adds the back stack 

stackBuilder.addParentStack(notify_activity.class); 

// Adds the Intent to the top of the stack 

stackBuilder.addNextIntent(resultIntent); 

// Gets a PendingIntent containing the entire back 

PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); 

mBuilder.setContentIntent(resultPendingIntent); 

NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 

mNotificationManager.notify(1, mBuilder.build());

 範例程式下載


      ps.官網說明文件 有提到:
由於setLatestEventInfoThis method was deprecated in API level 11(ANdroid 3.0).所以用 Notification.Builder instead.