android.os.Parcel.readByteArray NullPointerException
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);