[英]How to pass NameValuePair to another activity in android?
我的申請中有三個活動。 A
->
B
->
C
在Activity A
:我從用戶那里獲取了一些數據,並添加了這些數據NameValuePair。 我將在Activity B
執行其他一些操作。 之后,在Activity C
,我要http發布NameValuePair。 但是,我不能將NameValuePair傳遞給另一個類。
我嘗試了以下解決方案: 解決方案
在Activity A
:
ArrayList<NameValuePair> nameValuePairs = new ArrayList<>();
nameValuePairs.add(new BasicNameValuePair("username", username));
nameValuePairs.add(new BasicNameValuePair("name", name));
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this,Main2Activity.class);
intent.putParcelableArrayListExtra ("nvp", (ArrayList<? extends Parcelable>) nameValuePairs);
startActivity(intent);
}
});
BasicNameValuePair.java
:
public class BasicNameValuePair implements Parcelable {
private int mData;
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel out, int flags) {
out.writeInt(mData);
}
public static final Parcelable.Creator<BasicNameValuePair> CREATOR
= new Parcelable.Creator<BasicNameValuePair>() {
public BasicNameValuePair createFromParcel(Parcel in) {
return new BasicNameValuePair(in);
}
public BasicNameValuePair[] newArray(int size) {
return new BasicNameValuePair[size];
}
};
private BasicNameValuePair(Parcel in) {
mData = in.readInt();
}
}
我的Activity A:
出現錯誤Activity A:
Error:(57, 94) error: incompatible types: ArrayList<NameValuePair> cannot be converted to ArrayList<? extends Parcelable>
如何通過NameValuePair進行其他活動?
對於此問題,您必須進行單例課程
那是DataHolder類
public class DataHolder {
public static final String TAG = "DataHolder";
private static DataHolder mDataHolder;
private ArrayList<NameValuePair> nameValuePairs;
private DataHolder() {
}
/**
* @return the DataHolder object. (This method returns always same object because of DataHolder is a Singleton Class.)
*/
public static synchronized DataHolder getInstance() {
if (null == mDataHolder) {
mDataHolder = new DataHolder();
}
return mDataHolder;
}
public ArrayList<NameValuePair> getNameValuePairs() {
return nameValuePairs;
}
public void setNameValuePairs(ArrayList<NameValuePair> nameValuePairs) {
this.nameValuePairs = nameValuePairs;
}
}
然后調用下面的代碼來設置數據
ArrayList<NameValuePair> nameValuePairs = new ArrayList<>();
nameValuePairs.add(new BasicNameValuePair("username", username));
nameValuePairs.add(new BasicNameValuePair("name", name));
DataHolder dataHolder = DataHolder.getInstance();
dataHolder.setNameValuePairs(nameValuePairs);
並在需要的地方獲取數據
ArrayList<NameValuePair> nameValuePairs;
DataHolder dataHolder = DataHolder.getInstance();
nameValuePairs = dataHolder.getNameValuePairs();
我希望這會起作用
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.