我如何通过一个自定义类型的对象从一个活动到另一个使用类意图的putExtra()方法?
当前回答
你可以使用putExtra(Serializable..)和getSerializableExtra()方法来传递和检索你的类类型的对象;你必须将你的类标记为Serializable,并确保你所有的成员变量也是Serializable…
其他回答
POJO类“Post”(注意它是实现Serializable的)
package com.example.booklib;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import android.graphics.Bitmap;
public class Post implements Serializable{
public String message;
public String bitmap;
List<Comment> commentList = new ArrayList<Comment>();
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getBitmap() {
return bitmap;
}
public void setBitmap(String bitmap) {
this.bitmap = bitmap;
}
public List<Comment> getCommentList() {
return commentList;
}
public void setCommentList(List<Comment> commentList) {
this.commentList = commentList;
}
}
POJO类“Comment”(由于是Post类的成员,它也需要实现Serializable)
package com.example.booklib;
import java.io.Serializable;
public class Comment implements Serializable{
public String message;
public String fromName;
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getFromName() {
return fromName;
}
public void setFromName(String fromName) {
this.fromName = fromName;
}
}
然后在您的活动类中,您可以执行以下操作将对象传递给另一个活动。
ListView listview = (ListView) findViewById(R.id.post_list);
listview.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Post item = (Post)parent.getItemAtPosition(position);
Intent intent = new Intent(MainActivity.this,CommentsActivity.class);
intent.putExtra("post",item);
startActivity(intent);
}
});
在您的接收类“CommentsActivity”中,您可以获得如下数据
Post post =(Post)getIntent().getSerializableExtra("post");
谢谢你的帮助,但我发现了一个可选的解决方案
public class getsetclass implements Serializable {
private int dt = 10;
//pass any object, drwabale
public int getDt() {
return dt;
}
public void setDt(int dt) {
this.dt = dt;
}
}
活动一
getsetclass d = new getsetclass ();
d.setDt(50);
LinkedHashMap<String, Object> obj = new LinkedHashMap<String, Object>();
obj.put("hashmapkey", d);
Intent inew = new Intent(SgParceLableSampelActivity.this,
ActivityNext.class);
Bundle b = new Bundle();
b.putSerializable("bundleobj", obj);
inew.putExtras(b);
startActivity(inew);
在活动2中获取数据
try { setContentView(R.layout.main);
Bundle bn = new Bundle();
bn = getIntent().getExtras();
HashMap<String, Object> getobj = new HashMap<String, Object>();
getobj = (HashMap<String, Object>) bn.getSerializable("bundleobj");
getsetclass d = (getsetclass) getobj.get("hashmapkey");
} catch (Exception e) {
Log.e("Err", e.getMessage());
}
我发现最简单的解决办法是… 创建带有getter和setter的静态数据成员的类。
从一个活动中设置并从另一个活动中获取该对象。
活动
mytestclass.staticfunctionSet("","",""..etc.);
活动b
mytestclass obj= mytestclass.staticfunctionGet();
public class SharedBooking implements Parcelable{
public int account_id;
public Double betrag;
public Double betrag_effected;
public int taxType;
public int tax;
public String postingText;
public SharedBooking() {
account_id = 0;
betrag = 0.0;
betrag_effected = 0.0;
taxType = 0;
tax = 0;
postingText = "";
}
public SharedBooking(Parcel in) {
account_id = in.readInt();
betrag = in.readDouble();
betrag_effected = in.readDouble();
taxType = in.readInt();
tax = in.readInt();
postingText = in.readString();
}
public int getAccount_id() {
return account_id;
}
public void setAccount_id(int account_id) {
this.account_id = account_id;
}
public Double getBetrag() {
return betrag;
}
public void setBetrag(Double betrag) {
this.betrag = betrag;
}
public Double getBetrag_effected() {
return betrag_effected;
}
public void setBetrag_effected(Double betrag_effected) {
this.betrag_effected = betrag_effected;
}
public int getTaxType() {
return taxType;
}
public void setTaxType(int taxType) {
this.taxType = taxType;
}
public int getTax() {
return tax;
}
public void setTax(int tax) {
this.tax = tax;
}
public String getPostingText() {
return postingText;
}
public void setPostingText(String postingText) {
this.postingText = postingText;
}
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(account_id);
dest.writeDouble(betrag);
dest.writeDouble(betrag_effected);
dest.writeInt(taxType);
dest.writeInt(tax);
dest.writeString(postingText);
}
public static final Parcelable.Creator<SharedBooking> CREATOR = new Parcelable.Creator<SharedBooking>()
{
public SharedBooking createFromParcel(Parcel in)
{
return new SharedBooking(in);
}
public SharedBooking[] newArray(int size)
{
return new SharedBooking[size];
}
};
}
传递数据:
Intent intent = new Intent(getApplicationContext(),YourActivity.class);
Bundle bundle = new Bundle();
i.putParcelableArrayListExtra("data", (ArrayList<? extends Parcelable>) dataList);
intent.putExtras(bundle);
startActivity(intent);
检索数据:
Bundle bundle = getIntent().getExtras();
dataList2 = getIntent().getExtras().getParcelableArrayList("data");
Start another activity from this activity pass parameters via Bundle Object
Intent intent = new Intent(this, YourActivity.class);
Intent.putExtra(AppConstants.EXTRAS.MODEL, cModel);
startActivity(intent);
Retrieve on another activity (YourActivity)
ContentResultData cModel = getIntent().getParcelableExtra(AppConstants.EXTRAS.MODEL);
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