Java 包返回空布尔数组
我创建了一个包含布尔数组的可包裹对象Java 包返回空布尔数组,java,android,arrays,boolean,parcelable,Java,Android,Arrays,Boolean,Parcelable,我创建了一个包含布尔数组的可包裹对象 public class Alarm implements Parcelable { private int hours; private int minutes; private int alarmTime; private int ID; private boolean alarmSet; private boolean[] days; private String[] symbols; private String sound; private bo
public class Alarm implements Parcelable {
private int hours;
private int minutes;
private int alarmTime;
private int ID;
private boolean alarmSet;
private boolean[] days;
private String[] symbols;
private String sound;
private boolean snooze;
private String picture;
public Alarm() {
days = new boolean[7];
symbols = new String[]{"月","火","水","木","金","土","日","毎日"};
}
protected Alarm(Parcel in) {
hours = in.readInt();
minutes = in.readInt();
alarmTime = in.readInt();
in.readBooleanArray(days);
ID = in.readInt();
alarmSet = in.readByte() != 0x00;
sound = in.readString();
snooze = in.readByte() != 0x00;
symbols = new String[]{"月","火","水","木","金","土","日","毎日"};
picture = in.readString();
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(hours);
dest.writeInt(minutes);
dest.writeInt(alarmTime);
dest.writeInt(ID);
dest.writeBooleanArray(days);
dest.writeByte((byte) (alarmSet ? 0x01 : 0x00));
dest.writeString(sound);
dest.writeByte((byte) (snooze ? 0x01 : 0x00));
dest.writeString(picture);
}
public static final Parcelable.Creator<Alarm> CREATOR = new Parcelable.Creator<Alarm>() {
@Override
public Alarm createFromParcel(Parcel in) {
return new Alarm(in);
}
@Override
public Alarm[] newArray(int size) {
return new Alarm[size];
}
};
我认为我遵循了创建可包裹对象的正确方法,大多数值似乎都很好(没有检查所有值)
这是航海日志
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.test.alarm/com.android.test.alarm.AlarmSettings}: java.lang.NullPointerException: Attempt to get length of null array
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.access$800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
Caused by: java.lang.NullPointerException: Attempt to get length of null array
at android.os.Parcel.readBooleanArray(Parcel.java:807)
at com.android.test.alarm.Alarm.<init>(Alarm.java:149)
at com.android.test.alarm.Alarm$1.createFromParcel(Alarm.java:181)
at com.android.test.alarm.Alarm$1.createFromParcel(Alarm.java:178)
at android.os.Parcel.readParcelable(Parcel.java:2252)
at android.os.Parcel.readValue(Parcel.java:2152)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2485)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.Bundle.getParcelable(Bundle.java:755)
at com.android.test.alarm.AlarmSettings.onCreate(AlarmSettings.java:19)
at android.app.Activity.performCreate(Activity.java:6010)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.access$800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
java.lang.RuntimeException:无法启动活动组件信息{com.android.test.alarm/com.android.test.alarm.AlarmSettings}:java.lang.NullPointerException:尝试获取空数组的长度
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339)上
位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
在android.app.ActivityThread.access$800(ActivityThread.java:155)
在android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
位于android.os.Handler.dispatchMessage(Handler.java:102)
位于android.os.Looper.loop(Looper.java:135)
位于android.app.ActivityThread.main(ActivityThread.java:5343)
位于java.lang.reflect.Method.invoke(本机方法)
位于java.lang.reflect.Method.invoke(Method.java:372)
在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run上(ZygoteInit.java:905)
位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
原因:java.lang.NullPointerException:尝试获取空数组的长度
位于android.os.Parcel.readBooleanArray(Parcel.java:807)
位于com.android.test.alarm.alarm(alarm.java:149)
位于com.android.test.alarm.alarm$1.createFromParcel(alarm.java:181)
在com.android.test.alarm.alarm$1.createFromParcel(alarm.java:178)上
位于android.os.Parcel.readParcelable(Parcel.java:2252)
位于android.os.Parcel.readValue(Parcel.java:2152)
在android.os.Parcel.ReadyArrayMapInternal(Parcel.java:2485)
位于android.os.BaseBundle.unparcel(BaseBundle.java:221)
位于android.os.Bundle.getParcelable(Bundle.java:755)
位于com.android.test.alarm.AlarmSettings.onCreate(AlarmSettings.java:19)
位于android.app.Activity.performCreate(Activity.java:6010)
位于android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)上
位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
在android.app.ActivityThread.access$800(ActivityThread.java:155)
在android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
位于android.os.Handler.dispatchMessage(Handler.java:102)
位于android.os.Looper.loop(Looper.java:135)
位于android.app.ActivityThread.main(ActivityThread.java:5343)
位于java.lang.reflect.Method.invoke(本机方法)
位于java.lang.reflect.Method.invoke(Method.java:372)
在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run上(ZygoteInit.java:905)
位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
是它null
。看看你的读
,写
:
// your Alarm(Parcel in)
hours = in.readInt();
minutes = in.readInt();
alarmTime = in.readInt();
in.readBooleanArray(days);
// Your write function:
dest.writeInt(hours);
dest.writeInt(minutes);
dest.writeInt(alarmTime);
dest.writeInt(ID);
dest.writeBooleanArray(days);
与上述函数一样,您将
布尔数组
写入第5个值,但将其读取为第4个值-->当然它是空的。因此,您应该更改写入位置或读取位置。是它null
。看看你的读
,写
:
// your Alarm(Parcel in)
hours = in.readInt();
minutes = in.readInt();
alarmTime = in.readInt();
in.readBooleanArray(days);
// Your write function:
dest.writeInt(hours);
dest.writeInt(minutes);
dest.writeInt(alarmTime);
dest.writeInt(ID);
dest.writeBooleanArray(days);
与上述函数一样,您将
布尔数组
写入第5个值,但将其读取为第4个值-->当然它是空的。因此,您应该更改写入位置或读取位置。我认为您尚未启动数组。将this()
添加到第二个构造函数中
protected Alarm(Parcel in) {
this();//add this to make sure arrays are initialised
dest.writeInt(hours);
dest.writeInt(minutes);
我想你还没有开始你的阵法。将
this()
添加到第二个构造函数中