我正在尝试实施Parcleable,以便我可以将其添加为额外的(这是一项要求)。启动活动后没有出现可修复的问题
这里是类SwinImage
这只能说明相关的细节,即它是从Parcleable衍生部分的削减版本:
package com.example.kevin.imagemetadata;
import android.os.Parcel;
import android.os.Parcelable;
public class SwinImage implements Parcelable
{
public SwinImage(String imageName, String location, String[] keywords, String imageDate, boolean share, String email, int rating)
{
update(imageName, location, keywords, imageDate, share, email, rating);
}
//A constructor for when we havent assigned any metadata.
public SwinImage(String imageName)
{
}
public void update(String imageName, String location, String[] keywords, String imageDate, boolean share, String email, int rating)
{
}
@Override
public String toString()
{
}
private void storeImageDetails() {
}
@Override
//We don't need it - but we are forced to due to interface.
public int describeContents()
{
return 0;
}
@Override
public void writeToParcel(Parcel out, int flags)
{
out.writeString(imageName);
out.writeString(location);
out.writeStringArray(keywords);
out.writeString(imageDate);
//Can write boolean array but not boolean...
boolean[] temp = {share};
out.writeBooleanArray(temp);
out.writeString(email);
out.writeInt(rating);
}
public static final Parcelable.Creator<SwinImage> CREATOR = new Parcelable.Creator<SwinImage>()
{
@Override
public SwinImage createFromParcel(Parcel parcel)
{
return new SwinImage(parcel);
}
@Override
public SwinImage[] newArray(int i)
{
return new SwinImage[i];
}
};
//THE PRIVATE CONSTRUCTOR - FOR INTERNAL USE ONLY.
private SwinImage(Parcel parcel)
{
imageName = parcel.readString();
location = parcel.readString();
parcel.readStringArray(keywords);
imageDate = parcel.readString();
boolean[] tempArr = new boolean[1];
parcel.readBooleanArray(tempArr);
share = tempArr[0];
email = parcel.readString();
rating = parcel.readInt();
}
}
好......所以,在调用的类,我这样做:
public void ClickedImage(View v)
{
Intent i = new Intent(this, MetaDataActivity.class);
switch (getResources().getResourceEntryName(v.getId()))
{
case "burgerView":
i.putExtra("SENT_IMAGE", burger); //IT IMPLEMENTS PARCLEABLE THEREFORE WE CAN PASS IT WHERE IT LOOKS FOR A PARCEL
break;
case "pitaView":
i.putExtra("SENT_IMAGE", pita);
break;
case "pizzaView":
i.putExtra("SENT_IMAGE", pizza);
break;
case "steakView":
i.putExtra("SENT_IMAGE", steak);
break;
}
startActivityForResult(i, GET_AND_SET_METADATA_REQUEST);
}
我在最后设置断点,并且确实可以看到,这是在正确的意图:
然而,当谈到获得它:
@Override
protected void onCreate(Bundle savedInstanceState)
{
Log.d("Does", "Does this work");
Intent i;
i = getIntent();
image = i.getExtras().getParcelable("SENT_IMAGE");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_meta_data);
}
这是从来没有在那里。 image
的分配会使程序崩溃,而且我无法看到调试器我的SwinImage
甚至存在于意图内。
我在做什么错?它为什么会崩溃?我已经尝试了几个小时的解决方案(主要是改变我的分配方式 - 有些“解决方案”已经阻止了它的崩溃,但image
被分配了空值)
任何人都可以提供一些见解吗?谢谢。
编辑:
我试图移动getIntent
到onCreate
后无果。
编辑#2:堆栈跟踪:
http://pastebin.com/raw/XJbPxHRv
和类型的steak
等:
public class MainActivity extends AppCompatActivity {
static final int GET_AND_SET_METADATA_REQUEST = 1; // The request code
SwinImage burger, pita, pizza, steak;
如果你有崩溃,为什么不从设备的logcat附加崩溃日志?同时显示代码使用的变量类型('image','pizza'等)。 – Sergio
嗨,谢谢@Serhio我已经更新了OP。 – Kevin