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
在臂膀上
在build.gradle中添加kotlin扩展。
apply plugin: 'kotlin-android-extensions'
android {
androidExtensions {
experimental = true
}
}
然后像这样创建数据类。
@Parcelize
data class Sample(val id: Int, val name: String) : Parcelable
传递带有意图的对象
val sample = Sample(1,"naveen")
val intent = Intent(context, YourActivity::class.java)
intent.putExtra("id", sample)
startActivity(intent)
获取带有意图的对象
val sample = intent.getParcelableExtra("id")
其他回答
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");
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());
}
如果你对putExtra特性的使用不是很特别，只是想启动另一个带有对象的活动，你可以查看我写的GNLauncher (https://github.com/noxiouswinter/gnlib_android/wiki#gnlauncher)库，它试图使这个过程更直接。
GNLauncher可以将对象/数据从另一个活动发送到一个活动，就像调用活动中的函数一样简单，并将所需的数据作为参数。它引入了类型安全，并消除了必须序列化的所有麻烦，使用字符串键附加到意图，并在另一端撤销相同的操作。
如果你有一个单例类(fx Service)作为你的模型层的网关，它可以通过在该类中有一个带有getter和setter的变量来解决。
活动一:
Intent intent = new Intent(getApplicationContext(), Activity2.class);
service.setSavedOrder(order);
startActivity(intent);
活动二:
private Service service;
private Order order;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quality);
service = Service.getInstance();
order = service.getSavedOrder();
service.setSavedOrder(null) //If you don't want to save it for the entire session of the app.
}
在服务:
private static Service instance;
private Service()
{
//Constructor content
}
public static Service getInstance()
{
if(instance == null)
{
instance = new Service();
}
return instance;
}
private Order savedOrder;
public Order getSavedOrder()
{
return savedOrder;
}
public void setSavedOrder(Order order)
{
this.savedOrder = order;
}
此解决方案不需要对相关对象进行任何序列化或其他“打包”。但是，只有在使用这种架构时才会有好处。
创建Android应用程序
文件>>新建>> Android应用程序
输入项目名称:android-pass-object-to-activity
Pakcage: com.hmkcode.android
保持其他默认选择，点击下一步直到完成
在开始创建应用程序之前，我们需要创建POJO类“Person”，我们将使用它将对象从一个活动发送到另一个活动。注意，该类正在实现Serializable接口。
将位于
package com.hmkcode.android;
import java.io.Serializable;
public class Person implements Serializable{
private static final long serialVersionUID = 1L;
private String name;
private int age;
// getters & setters....
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + "]";
}
}
两个活动的两种布局
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/tvName"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center_horizontal"
android:text="Name" />
<EditText
android:id="@+id/etName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10" >
<requestFocus />
</EditText>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/tvAge"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center_horizontal"
android:text="Age" />
<EditText
android:id="@+id/etAge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10" />
</LinearLayout>
<Button
android:id="@+id/btnPassObject"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Pass Object to Another Activity" />
</LinearLayout>
activity_another.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/tvPerson"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:gravity="center_horizontal"
/>
</LinearLayout>
两个活动类别
1)ActivityMain.java
package com.hmkcode.android;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity implements OnClickListener {
Button btnPassObject;
EditText etName, etAge;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnPassObject = (Button) findViewById(R.id.btnPassObject);
etName = (EditText) findViewById(R.id.etName);
etAge = (EditText) findViewById(R.id.etAge);
btnPassObject.setOnClickListener(this);
}
@Override
public void onClick(View view) {
// 1. create an intent pass class name or intnet action name
Intent intent = new Intent("com.hmkcode.android.ANOTHER_ACTIVITY");
// 2. create person object
Person person = new Person();
person.setName(etName.getText().toString());
person.setAge(Integer.parseInt(etAge.getText().toString()));
// 3. put person in intent data
intent.putExtra("person", person);
// 4. start the activity
startActivity(intent);
}
}
2)AnotherActivity.java
package com.hmkcode.android;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class AnotherActivity extends Activity {
TextView tvPerson;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_another);
// 1. get passed intent
Intent intent = getIntent();
// 2. get person object from intent
Person person = (Person) intent.getSerializableExtra("person");
// 3. get reference to person textView
tvPerson = (TextView) findViewById(R.id.tvPerson);
// 4. display name & age on textView
tvPerson.setText(person.toString());
}
}
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