可以让其显示一会儿然后消失
也可以隔一段时间不断显示
第一种方式
/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.app;import com.example.android.apis.R;import android.app.Activity;import android.widget.Button;import android.os.Bundle;import android.view.View;import android.widget.Toast;/** * When you push the button on this Activity, it creates a [email protected] Toast} object and * using the Toast method. * @see Toast * @see Toast#makeText(android.content.Context,int,int) * @see Toast#makeText(android.content.Context,java.lang.CharSequence,int) * @see Toast#LENGTH_SHORT * @see Toast#LENGTH_LONG */public class NotifyWithText extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.notify_with_text); Button button; // short notification button = (Button) findViewById(R.id.short_notify); button.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { // Note that we create the Toast object and call the show() method // on it all on one line. Most uses look like this, but there // are other methods on Toast that you can call to configure how // it appears. // // Note also that we use the version of makeText that takes a // resource id (R.string.short_notification_text). There is also // a version that takes a CharSequence if you must construct // the text yourself. Toast.makeText(NotifyWithText.this, R.string.short_notification_text, Toast.LENGTH_SHORT).show(); } }); // long notification // The only difference here is that the notification stays up longer. // You might want to use this if there is more text that they're going // to read. button = (Button) findViewById(R.id.long_notify); button.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { Toast.makeText(NotifyWithText.this, R.string.long_notification_text, Toast.LENGTH_LONG).show(); } }); }}
第二种方式
package com.example.android.apis.app;// Need the following import to get access to the app resources, since this// class is in a sub-package.import com.example.android.apis.R;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.content.Intent;import android.os.SystemClock;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;import java.util.Calendar;/** * Example of scheduling one-shot and repeating alarms. See * [email protected] OneShotAlarm} for the code run when the one-shot alarm goes off, and * [email protected] RepeatingAlarm} for the code run when the repeating alarm goes off. * <h4>Demo</h4>App/Service/Alarm Controller <h4>Source files</h4><table class="LinkTable"> <tr> <td class="LinkColumn">src/com.example.android.apis/app/AlarmController.java</td> <td class="DescrColumn">The activity that lets you schedule alarms</td> </tr> <tr> <td class="LinkColumn">src/com.example.android.apis/app/OneShotAlarm.java</td> <td class="DescrColumn">This is an intent receiver that executes when the one-shot alarm goes off</td> </tr> <tr> <td class="LinkColumn">src/com.example.android.apis/app/RepeatingAlarm.java</td> <td class="DescrColumn">This is an intent receiver that executes when the repeating alarm goes off</td> </tr> <tr> <td class="LinkColumn">/res/any/layout/alarm_controller.xml</td> <td class="DescrColumn">Defines contents of the screen</td> </tr></table> */public class AlarmController extends Activity { Toast mToast; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.alarm_controller); // Watch for button clicks. Button button = (Button)findViewById(R.id.one_shot); button.setOnClickListener(mOneShotListener); button = (Button)findViewById(R.id.start_repeating); button.setOnClickListener(mStartRepeatingListener); button = (Button)findViewById(R.id.stop_repeating); button.setOnClickListener(mStopRepeatingListener); } private OnClickListener mOneShotListener = new OnClickListener() { public void onClick(View v) { // When the alarm goes off, we want to broadcast an Intent to our // BroadcastReceiver. Here we make an Intent with an explicit class // name to have our own receiver (which has been published in // AndroidManifest.xml) instantiated and called, and then create an // IntentSender to have the intent executed as a broadcast. Intent intent = new Intent(AlarmController.this, OneShotAlarm.class); PendingIntent sender = PendingIntent.getBroadcast(AlarmController.this, 0, intent, 0); // We want the alarm to go off 30 seconds from now. Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.SECOND, 30); // Schedule the alarm! AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender); // Tell the user about what we did. if (mToast != null) { mToast.cancel(); } mToast = Toast.makeText(AlarmController.this, R.string.one_shot_scheduled, Toast.LENGTH_LONG); mToast.show(); } }; private OnClickListener mStartRepeatingListener = new OnClickListener() { public void onClick(View v) { // When the alarm goes off, we want to broadcast an Intent to our // BroadcastReceiver. Here we make an Intent with an explicit class // name to have our own receiver (which has been published in // AndroidManifest.xml) instantiated and called, and then create an // IntentSender to have the intent executed as a broadcast. // Note that unlike above, this IntentSender is configured to // allow itself to be sent multiple times. Intent intent = new Intent(AlarmController.this, RepeatingAlarm.class); PendingIntent sender = PendingIntent.getBroadcast(AlarmController.this, 0, intent, 0); // We want the alarm to go off 30 seconds from now. long firstTime = SystemClock.elapsedRealtime(); firstTime += 15*1000; // Schedule the alarm! AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE); am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstTime, 15*1000, sender); // Tell the user about what we did. if (mToast != null) { mToast.cancel(); } mToast = Toast.makeText(AlarmController.this, R.string.repeating_scheduled, Toast.LENGTH_LONG); mToast.show(); } }; private OnClickListener mStopRepeatingListener = new OnClickListener() { public void onClick(View v) { // Create the same intent, and thus a matching IntentSender, for // the one that was scheduled. Intent intent = new Intent(AlarmController.this, RepeatingAlarm.class); PendingIntent sender = PendingIntent.getBroadcast(AlarmController.this, 0, intent, 0); // And cancel the alarm. AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE); am.cancel(sender); // Tell the user about what we did. if (mToast != null) { mToast.cancel(); } mToast = Toast.makeText(AlarmController.this, R.string.repeating_unscheduled, Toast.LENGTH_LONG); mToast.show(); } };}