Android 闹钟没有通知显示，无法播放歌曲和启动按钮错误
No notifications Display, Cannot play the song and error for start button for Android Alarm Clock
我是 Android Studio 的初学者
我尝试制作 Android 闹钟，现在它无法显示通知，没有播放音乐，并且停止按钮也有错误。这是我的代码，希望有人能帮我解决。谢谢
AlarmReceiver.java
package com.google.alarmclock;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class Alarm_Receiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent)
{
Log.e("We are in the Receiver","yaa");
//fetch extra strings from the intent
String get_your_string = intent.getExtras().getString("extra");
Log.e("What is the key?", get_your_string);
//create an intent to the ringtone service
Intent service_intent=new Intent(context,RingtonePlayingService.class);
//pass the extra string from Main Activity to the Ringtone Playing Service,pass to the start service
service_intent.putExtra("extra",get_your_string);
//start the ringtone service
context.startService(service_intent);
}
}
MainActivity.java
package com.google.alarmclock;
import android.annotation.TargetApi;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
//to make alarm manager
AlarmManager alarm_manager;
TimePicker alarm_timepicker;
TextView update_text;
Context context;
PendingIntent pending_intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
this.context = this;
//initialize alarm manager
alarm_manager=(AlarmManager)getSystemService(ALARM_SERVICE);
//initialize timepicker
alarm_timepicker=(TimePicker)findViewById(R.id.timePicker);
//initialize our text update box
update_text=(TextView)findViewById(R.id.update_text);
//create an instance of a calender
final Calendar calendar= Calendar.getInstance();
//create an intent to the Alarm Receiver class
final Intent my_intent=new Intent(MainActivity.this,Alarm_Receiver.class);
//initialize start buttons
Button alarm_on=(Button)findViewById(R.id.start_alarm);
//create an onClick listener to start the alarm
alarm_on.setOnClickListener(new View.OnClickListener() {
@TargetApi(Build.VERSION_CODES.M)
@Override
public void onClick(View view) {
//setting calendar instance with the hour and minute that ve picked
//on the time picker
calendar.set(Calendar.HOUR_OF_DAY,alarm_timepicker.getCurrentHour());
calendar.set(Calendar.MINUTE,alarm_timepicker.getCurrentMinute());
//get the string values of the hour and minute
int hour=alarm_timepicker.getCurrentHour();
int minute=alarm_timepicker.getCurrentMinute();
//converts the int value to strings
String hour_string=String.valueOf(hour);
String minute_string=String.valueOf(minute);
//conver 24hour time to 12 hour time
if(hour>12)
{
hour_string=String.valueOf(hour-12);
}
if(minute<10){
minute_string="0" +String.valueOf(minute);
}
//method that changes the update text Textbox
set_alarm_text("Alarm set to: "+hour_string+ ":" + minute_string);
//put in extra string into my_intent
//tells the clock that you pressed the "alarm on" button
my_intent.putExtra("extra","alarm on");
//create a pending intent that delays the intent
//until the specified calendar time
pending_intent=PendingIntent.getBroadcast(MainActivity.this,0,my_intent,PendingIntent.FLAG_UPDATE_CURRENT);
//set the alarm manager
alarm_manager.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pending_intent);
}
});
//initialize the stop button
Button alarm_off=(Button)findViewById(R.id.end_alarm);
//create an onClick listener to undo an alarm set
alarm_off.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//method that changes the update text Textbox
set_alarm_text("Alarm off!");
//cancel the alarm
alarm_manager.cancel(pending_intent);
//put extra string into my_intent
//tells the clock that you pressed the "alarm off" button
my_intent.putExtra("extra","alarm off");
//stop the ringtone
sendBroadcast(my_intent);
}
});
}
private void set_alarm_text(String output) {
update_text.setText(output);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
RingtonePlayingService.java
package com.google.alarmclock;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;
import java.security.Provider;
import java.util.List;
import java.util.Map;
public class RingtonePlayingService extends Service {
MediaPlayer player=MediaPlayer.create(this, Settings.System.DEFAULT_RINGTONE_URI);
int startId;
boolean isRunning;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LocalService", "Received start id " + startId + ": " + intent);
//fetch the extra string values
String state = intent.getExtras().getString("extra");
Log.e("Ringtone extra is",state);
//this converts the extra strings from the intent
//to start IDs, values 0 or 1
assert state !=null;
switch (state) {
case "alarm on":
startId = 1;
break;
case "alarm off":
startId = 0;
Log.e("Start ID is ",state);
break;
default:
startId = 0;
break;
}
//if else statements
//if there is no music playing, and the user pressed "alarm on"
//music should start playing
if (!this.isRunning && startId==1)
{
Log.e("there is no music, ","and you want start");
//create an instance of the media player
player = MediaPlayer.create(this,R.raw.singer);
player.start();
this.isRunning=true;
this.startId=0;
//put the notification here,test it out
//notification
//set up the notification service
NotificationManager notify_manager=(NotificationManager)
getSystemService(NOTIFICATION_SERVICE);
//set up an intent that goes to the Main Activity
Intent intent_main_activity=new Intent(this.getApplicationContext(),MainActivity.class);
//set up a pending intent
PendingIntent pending_intent_main_activity=PendingIntent.getActivity(this,0,
intent_main_activity,0);
//make the notification parameters
Notification notification_popup=new Notification.Builder(this)
.setContentTitle("An alarm is going off!")
.setContentText("Click Me")
.setContentIntent(pending_intent_main_activity)
.setAutoCancel(true)
.setSmallIcon(R.mipmap.ic_launcher)
.build();
//set up the notification call command
notify_manager.notify(0,notification_popup);
}
//if there is music playing, and the user pressed "alarm off"
//music should stop playing
else if (this.isRunning && startId == 0)
{
Log.e("there is music, ","and you want end");
//stop the ringtone
player.stop();
player.reset();
this.isRunning=false;
this.startId=0;
}
//there are if user presses random buttons
//just to bug-proof the app
//if there is no music playing, and the user pressed "alarm off"
//do nothing
else if (!this.isRunning && startId == 0)
{
Log.e("there is no music, ","and you want end");
//stop the ringtone
this.isRunning=false;
this.startId=0;
}
//if there is music playing and the user pressed "alarm on"
//do nothing
else if (this.isRunning && startId ==1)
{
Log.e("there is music, ","and you want start");
this.isRunning =true;
this.startId=1;
}
//can't think of anything else, just to catch the odd event
else
{
Log.e("else ","somehow you reached ");
}
//if something is wrong, it can restart
return START_NOT_STICKY;
}
@Override
public void onDestroy() {
// Tell the user we stopped.
Log.e("on Destroy called","ta da");
super.onDestroy();
this.isRunning=false;
//Toast.makeText(this, "on Destroy called ", Toast.LENGTH_SHORT).show();
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".Alarm_Receiver"/>
<service android:name=".RingtonePlayingService"
android:enabled="true"/>
</application>
build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.2"
defaultConfig {
applicationId "com.google.alarmclock"
minSdkVersion 16
targetSdkVersion 24
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support:design:24.2.1'
testCompile 'junit:junit:4.12'
}
this is the error when clicking the start button
Is this an error for the music?
java.lang.RuntimeException: Unable to start service com.google.alarmclock.RingtonePlayingService@1cba53b with Intent { cmp=com.google.alarmclock/.RingtonePlayingService (has extras) }: java.lang.IllegalArgumentException: Invalid notification (no valid small icon): Notification(pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x10 color=0x00000000 vis=PRIVATE)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3314)
at android.app.ActivityThread.-wrap21(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1565)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.IllegalArgumentException: Invalid notification (no valid small icon): Notification(pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x10 color=0x00000000 vis=PRIVATE)
at android.app.NotificationManager.notifyAsUser(NotificationManager.java:306)
at android.app.NotificationManager.notify(NotificationManager.java:284)
at android.app.NotificationManager.notify(NotificationManager.java:268)
at com.google.alarmclock.RingtonePlayingService.onStartCommand(RingtonePlayingService.java:96)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3297)
at android.app.ActivityThread.-wrap21(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1565)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
当点击停止按钮时
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.google.alarmclock, PID: 2665
java.lang.NullPointerException: cancel() called with a null PendingIntent
at android.app.AlarmManager.cancel(AlarmManager.java:890)
at com.google.alarmclock.MainActivity.onClick(MainActivity.java:111)
at android.view.View.performClick(View.java:5609)
at android.view.View$PerformClick.run(View.java:22259)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
从你的 build.gradle 我可以看出为什么抛出 noSuchMethod 异常。
为了使用函数alarm_timepicker.getHour()。您的目标必须是最小 API 23，才能毫无问题地使用此功能。
您包装函数的注释并没有多大作用。它只是防止 warnings/errors 在编码过程中显示。当应用程序处于活动状态时，将抛出运行时异常，因为找不到该方法。
如果您想继续使用 timepicker.getHour()，请确保您在 build.gradle minSdkVersion 23 中指定。请注意，这将要求您将应用安装到设备上 运行 SDK 23.
如果您不想对 build.gradle 进行这样的修改，那么我建议您使用此功能。 timepicker.getCurrentHour() 和 timepicker.getCurrentMinute()。
为了解决与 java.lang.RuntimeException: Unable to start service com.google.alarmclock.RingtonePlayingService@1cba53b with Intent { cmp=com.google.alarmclock/.RingtonePlayingService (has extras) }: java.lang.IllegalArgumentException: Invalid notification (no valid small icon)
相关的问题 #2
确保为通知设置了一个小图标。通知对象要求您设置此 属性.
试试这个：
Notification notification_popup=new Notification.Builder(this)
.setContentTitle("An alarm is going off!")
.setContentText("Click Me")
.setContentIntent(pending_intent_main_activity)
.setAutoCancel(true)
.setSmallIcon(R.mipmap.ic_launcher)
.build();
一定要注意 .setSmallIcon 代码。您的项目可能没有 mipmap 文件夹。您可能需要更改为 R.drawable.ic_launcher
与声音有关。我真的不知道这是否是一个问题，但我会尽快更新。
谢谢。
我是 Android Studio 的初学者 我尝试制作 Android 闹钟，现在它无法显示通知，没有播放音乐，并且停止按钮也有错误。这是我的代码，希望有人能帮我解决。谢谢
AlarmReceiver.java
package com.google.alarmclock;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class Alarm_Receiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent)
{
Log.e("We are in the Receiver","yaa");
//fetch extra strings from the intent
String get_your_string = intent.getExtras().getString("extra");
Log.e("What is the key?", get_your_string);
//create an intent to the ringtone service
Intent service_intent=new Intent(context,RingtonePlayingService.class);
//pass the extra string from Main Activity to the Ringtone Playing Service,pass to the start service
service_intent.putExtra("extra",get_your_string);
//start the ringtone service
context.startService(service_intent);
}
}
MainActivity.java
package com.google.alarmclock;
import android.annotation.TargetApi;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
//to make alarm manager
AlarmManager alarm_manager;
TimePicker alarm_timepicker;
TextView update_text;
Context context;
PendingIntent pending_intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
this.context = this;
//initialize alarm manager
alarm_manager=(AlarmManager)getSystemService(ALARM_SERVICE);
//initialize timepicker
alarm_timepicker=(TimePicker)findViewById(R.id.timePicker);
//initialize our text update box
update_text=(TextView)findViewById(R.id.update_text);
//create an instance of a calender
final Calendar calendar= Calendar.getInstance();
//create an intent to the Alarm Receiver class
final Intent my_intent=new Intent(MainActivity.this,Alarm_Receiver.class);
//initialize start buttons
Button alarm_on=(Button)findViewById(R.id.start_alarm);
//create an onClick listener to start the alarm
alarm_on.setOnClickListener(new View.OnClickListener() {
@TargetApi(Build.VERSION_CODES.M)
@Override
public void onClick(View view) {
//setting calendar instance with the hour and minute that ve picked
//on the time picker
calendar.set(Calendar.HOUR_OF_DAY,alarm_timepicker.getCurrentHour());
calendar.set(Calendar.MINUTE,alarm_timepicker.getCurrentMinute());
//get the string values of the hour and minute
int hour=alarm_timepicker.getCurrentHour();
int minute=alarm_timepicker.getCurrentMinute();
//converts the int value to strings
String hour_string=String.valueOf(hour);
String minute_string=String.valueOf(minute);
//conver 24hour time to 12 hour time
if(hour>12)
{
hour_string=String.valueOf(hour-12);
}
if(minute<10){
minute_string="0" +String.valueOf(minute);
}
//method that changes the update text Textbox
set_alarm_text("Alarm set to: "+hour_string+ ":" + minute_string);
//put in extra string into my_intent
//tells the clock that you pressed the "alarm on" button
my_intent.putExtra("extra","alarm on");
//create a pending intent that delays the intent
//until the specified calendar time
pending_intent=PendingIntent.getBroadcast(MainActivity.this,0,my_intent,PendingIntent.FLAG_UPDATE_CURRENT);
//set the alarm manager
alarm_manager.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),pending_intent);
}
});
//initialize the stop button
Button alarm_off=(Button)findViewById(R.id.end_alarm);
//create an onClick listener to undo an alarm set
alarm_off.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//method that changes the update text Textbox
set_alarm_text("Alarm off!");
//cancel the alarm
alarm_manager.cancel(pending_intent);
//put extra string into my_intent
//tells the clock that you pressed the "alarm off" button
my_intent.putExtra("extra","alarm off");
//stop the ringtone
sendBroadcast(my_intent);
}
});
}
private void set_alarm_text(String output) {
update_text.setText(output);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
RingtonePlayingService.java
package com.google.alarmclock;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;
import java.security.Provider;
import java.util.List;
import java.util.Map;
public class RingtonePlayingService extends Service {
MediaPlayer player=MediaPlayer.create(this, Settings.System.DEFAULT_RINGTONE_URI);
int startId;
boolean isRunning;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LocalService", "Received start id " + startId + ": " + intent);
//fetch the extra string values
String state = intent.getExtras().getString("extra");
Log.e("Ringtone extra is",state);
//this converts the extra strings from the intent
//to start IDs, values 0 or 1
assert state !=null;
switch (state) {
case "alarm on":
startId = 1;
break;
case "alarm off":
startId = 0;
Log.e("Start ID is ",state);
break;
default:
startId = 0;
break;
}
//if else statements
//if there is no music playing, and the user pressed "alarm on"
//music should start playing
if (!this.isRunning && startId==1)
{
Log.e("there is no music, ","and you want start");
//create an instance of the media player
player = MediaPlayer.create(this,R.raw.singer);
player.start();
this.isRunning=true;
this.startId=0;
//put the notification here,test it out
//notification
//set up the notification service
NotificationManager notify_manager=(NotificationManager)
getSystemService(NOTIFICATION_SERVICE);
//set up an intent that goes to the Main Activity
Intent intent_main_activity=new Intent(this.getApplicationContext(),MainActivity.class);
//set up a pending intent
PendingIntent pending_intent_main_activity=PendingIntent.getActivity(this,0,
intent_main_activity,0);
//make the notification parameters
Notification notification_popup=new Notification.Builder(this)
.setContentTitle("An alarm is going off!")
.setContentText("Click Me")
.setContentIntent(pending_intent_main_activity)
.setAutoCancel(true)
.setSmallIcon(R.mipmap.ic_launcher)
.build();
//set up the notification call command
notify_manager.notify(0,notification_popup);
}
//if there is music playing, and the user pressed "alarm off"
//music should stop playing
else if (this.isRunning && startId == 0)
{
Log.e("there is music, ","and you want end");
//stop the ringtone
player.stop();
player.reset();
this.isRunning=false;
this.startId=0;
}
//there are if user presses random buttons
//just to bug-proof the app
//if there is no music playing, and the user pressed "alarm off"
//do nothing
else if (!this.isRunning && startId == 0)
{
Log.e("there is no music, ","and you want end");
//stop the ringtone
this.isRunning=false;
this.startId=0;
}
//if there is music playing and the user pressed "alarm on"
//do nothing
else if (this.isRunning && startId ==1)
{
Log.e("there is music, ","and you want start");
this.isRunning =true;
this.startId=1;
}
//can't think of anything else, just to catch the odd event
else
{
Log.e("else ","somehow you reached ");
}
//if something is wrong, it can restart
return START_NOT_STICKY;
}
@Override
public void onDestroy() {
// Tell the user we stopped.
Log.e("on Destroy called","ta da");
super.onDestroy();
this.isRunning=false;
//Toast.makeText(this, "on Destroy called ", Toast.LENGTH_SHORT).show();
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".Alarm_Receiver"/>
<service android:name=".RingtonePlayingService"
android:enabled="true"/>
</application>
build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.2"
defaultConfig {
applicationId "com.google.alarmclock"
minSdkVersion 16
targetSdkVersion 24
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support:design:24.2.1'
testCompile 'junit:junit:4.12'
}
this is the error when clicking the start button
Is this an error for the music?
java.lang.RuntimeException: Unable to start service com.google.alarmclock.RingtonePlayingService@1cba53b with Intent { cmp=com.google.alarmclock/.RingtonePlayingService (has extras) }: java.lang.IllegalArgumentException: Invalid notification (no valid small icon): Notification(pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x10 color=0x00000000 vis=PRIVATE)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3314)
at android.app.ActivityThread.-wrap21(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1565)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.IllegalArgumentException: Invalid notification (no valid small icon): Notification(pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x10 color=0x00000000 vis=PRIVATE)
at android.app.NotificationManager.notifyAsUser(NotificationManager.java:306)
at android.app.NotificationManager.notify(NotificationManager.java:284)
at android.app.NotificationManager.notify(NotificationManager.java:268)
at com.google.alarmclock.RingtonePlayingService.onStartCommand(RingtonePlayingService.java:96)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3297)
at android.app.ActivityThread.-wrap21(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1565)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
当点击停止按钮时
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.google.alarmclock, PID: 2665
java.lang.NullPointerException: cancel() called with a null PendingIntent
at android.app.AlarmManager.cancel(AlarmManager.java:890)
at com.google.alarmclock.MainActivity.onClick(MainActivity.java:111)
at android.view.View.performClick(View.java:5609)
at android.view.View$PerformClick.run(View.java:22259)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
从你的 build.gradle 我可以看出为什么抛出 noSuchMethod 异常。 为了使用函数alarm_timepicker.getHour()。您的目标必须是最小 API 23，才能毫无问题地使用此功能。
您包装函数的注释并没有多大作用。它只是防止 warnings/errors 在编码过程中显示。当应用程序处于活动状态时，将抛出运行时异常，因为找不到该方法。
如果您想继续使用 timepicker.getHour()，请确保您在 build.gradle minSdkVersion 23 中指定。请注意，这将要求您将应用安装到设备上 运行 SDK 23.
如果您不想对 build.gradle 进行这样的修改，那么我建议您使用此功能。 timepicker.getCurrentHour() 和 timepicker.getCurrentMinute()。
为了解决与 java.lang.RuntimeException: Unable to start service com.google.alarmclock.RingtonePlayingService@1cba53b with Intent { cmp=com.google.alarmclock/.RingtonePlayingService (has extras) }: java.lang.IllegalArgumentException: Invalid notification (no valid small icon)
确保为通知设置了一个小图标。通知对象要求您设置此 属性.
试试这个：
Notification notification_popup=new Notification.Builder(this)
.setContentTitle("An alarm is going off!")
.setContentText("Click Me")
.setContentIntent(pending_intent_main_activity)
.setAutoCancel(true)
.setSmallIcon(R.mipmap.ic_launcher)
.build();
一定要注意 .setSmallIcon 代码。您的项目可能没有 mipmap 文件夹。您可能需要更改为 R.drawable.ic_launcher
与声音有关。我真的不知道这是否是一个问题，但我会尽快更新。
谢谢。