报错信息：

E/AndroidRuntime( 1626): java.lang.NullPointerException

E/AndroidRuntime( 1626):     at android.os.Parcel.readByteArray(Parcel.java:1649)

E/AndroidRuntime( 1626):     at xxxx.b.a(ContactInfo.java:47)

E/AndroidRuntime( 1626):     a  xxxxxx.b.createFromParcel(ContactInfo.java:40)

E/AndroidRuntime( 1626):     at android.os.Parcel.readParcelable(Parcel.java:2111)

E/AndroidRuntime( 1626):     at android.os.Parcel.readValue(Parcel.java:2020)

E/AndroidRuntime( 1626):     at android.os.Parcel.readListInternal(Parcel.java:2362)

E/AndroidRuntime( 1626):     at android.os.Parcel.readList(Parcel.java:1585)

E/AndroidRuntime( 1626):     at xxx.util.m.b(ParcelableUtils.java:54)

E/AndroidRuntime( 1626):     atxxxxxx.xxx.onClick(MainActivity.java:646)

E/AndroidRuntime( 1626):     at android.view.View.performClick(View.java:4444)

E/AndroidRuntime( 1626):     at android.view.View$PerformClick.run(View.java:18445)

E/AndroidRuntime( 1626):     at android.os.Handler.handleCallback(Handler.java:733)

E/AndroidRuntime( 1626):     at android.os.Handler.dispatchMessage(Handler.java:95)

E/AndroidRuntime( 1626):     at android.os.Looper.loop(Looper.java:136)

E/AndroidRuntime( 1626):     at android.app.ActivityThread.main(ActivityThread.java:5135)

E/AndroidRuntime( 1626):     at java.lang.reflect.Method.invokeNative(Native Method)

E/AndroidRuntime( 1626):     at java.lang.reflect.Method.invoke(Method.java:515)

E/AndroidRuntime( 1626):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)

E/AndroidRuntime( 1626):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)

E/AndroidRuntime( 1626):     at dalvik.system.NativeStart.main(Native Method)

W/ActivityManager(  789):   Force finishing activity xxxxx/.MainActivity

问题说明

当我在通过Parcel传递byte[]时出现了这个错误

public class ContactInfo implements Parcelable {

    private String mName;//联系人名称

    private String mNumber;// 联系人号码

//    private static byte[] bmBytes;//联系人头像

    private Bitmap bitmap;//头像bitmap

    @Override

    public int describeContents() {

        return 0;

    }

    @Override

    public void writeToParcel(Parcel dest, int flags) {

        dest.writeString(mName);

        dest.writeString(mNumber);

        byte[] bytes=getBytesFromBitmap(bitmap);

        dest.writeByteArray(bytes);

   }

    // 用来创建自定义的Parcelable的对象

    public static final Creator<ContactInfo> CREATOR = new Creator<ContactInfo>() {

        public ContactInfo createFromParcel(Parcel parcel) {

            ContactInfo info = new ContactInfo();

            String name = parcel.readString();

            info.setmName(name);

            String number = parcel.readString();

            info.setmNumber(number);

            byte[] bytes;

            parcel.readByteArray(bytes);

            info.setBitmap(getBitmapFromBytes(bytes));

            return info;

        }

        public ContactInfo[] newArray(int size) {

            return new ContactInfo[size];

        }

    };

    public static Bitmap getBitmapFromBytes(byte[] bytes) {

        return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

    }

    private byte[] getBytesFromBitmap(Bitmap bitmap) {

        ByteArrayOutputStream bytesOS = new ByteArrayOutputStream();

        //this.bitmap.compress(Bitmap.CompressFormat.PNG, 0, bytesOS);

        bitmap.compress(Bitmap.CompressFormat.PNG, 0, bytesOS);

        return bytesOS.toByteArray();

    }

    public void setBitmap(Bitmap bitmap) {

        this.bitmap = bitmap;

    }

    public Bitmap getBitmap() {

        return bitmap;

    }

    public String getmName() {

        return mName;

    }

    public void setmName(String mName) {

        this.mName = mName;

    }

    public String getmNumber() {

        return mNumber;

    }

    public void setmNumber(String mNumber) {

        this.mNumber = mNumber;

    }

}

解决

需要修改为在写入时使用：

byte[] bytes=getBytesFromBitmap(bitmap);

dest.writeInt(bytes.length);

dest.writeByteArray(bytes);

在读取时使用:

byte[] bytes=new byte[parcel.readInt()];

parcel.readByteArray(bytes);