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Android 中Activity 之间传递参数
时间：2022-06-25 23:13:33 编辑：袖梨 来源：一聚教程网
Android 中Activity 之间传递参数
1.传递简单数据
在A Activity中
findViewById(R.id.startBActicityBtn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,TheActivity.class);
// 对基础的数据类型进行传递
i.putExtra("data","我是国人");
startActivity(i);
}
});
在B Activity中接受数据
tv =(TextView)findViewById(R.id.TheTextView);
Intent i = getIntent();
tv.setText(i.getStringExtra("data"));
这种传值就是传递基本的数据类型
2.传递数据 包Bundle
在A Activity中
findViewById(R.id.startBActicityBtn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,TheActivity.class);
Bundle bundle = new Bundle();
bundle.putString("name","qll");
bundle.putInt("age",3);
// i.putExtras(bundle);
// 另种传递方式
i.putExtra("data",bundle);
startActivity(i);
}
});
}
在B Activity中接受数据
tv =(TextView)findViewById(R.id.TheTextView);
editText = (EditText) findViewById(R.id.editText3);
Intent i = getIntent();
// Bundle date = i.getExtras();
// 接受方式不同
Bundle date = i.getBundleExtra("data");
tv.setText(String.format("name=%s,age=%d",date.getString("name"),date.getInt("age")));
这总传递方式类似iOS中传递字典数据类型过来 。
3.传递值对象
自定义一个User类，传递自定义类需要对类进行序列化
用Serializable进行序列化
这种方法只需要类实现Serializable接口就可以了
User 类
import java.io.Serializable;
public class User implements Serializable{
private String name;
private int age;
public int getAge(){
return age;
}
public void setAge(int age){
this.age = age;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public User(String name,int age){
this.name = name;
this.age = age;
}
在A Activity中
findViewById(R.id.startBActicityBtn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,TheActivity.class);
i.putExtra("user",new User("qll",24));
startActivity(i);
}
});
}
在B Activity中
tv =(TextView)findViewById(R.id.TheTextView);
User user = (User)i.getSerializableExtra("user");
tv.setText(String.format("user info(name=%s,age=%d)",user.getName(),user.getAge()));
用Parcelable实现
同样的需要实现Parcelable接口
User 类
package com.example.wyhaiapple.transferdata1;
import android.os.Parcel;
import android.os.Parcelable;
import android.text.ParcelableSpan;
public class User implements Parcelable{
private String name;
private int age;
public int getAge(){
return age;
}
public void setAge(int age){
this.age = age;
}
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
public User(String name,int age){
this.name = name;
this.age = age;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(getName());
dest.writeInt(getAge());
}
public static final Creator CREATOR = new Creator() {
@Override
public User createFromParcel(Parcel source) {
return new User(source.readString(),source.readInt());
}
@Override
public User[] newArray(int size) {
return new User[size];
}
};
}
在A Activity中 与上面的相同
在B Activity中
tv =(TextView)findViewById(R.id.TheTextView);
User user = (User)i.getParcelableExtra("user");
tv.setText(String.format("user info(name=%s,age=%d)",user.getName(),user.getAge()));
4.获取 Activity 的返回参数
在B Activity中
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_the);
tv =(TextView)findViewById(R.id.TheTextView);
editText = (EditText) findViewById(R.id.editText3);
findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent();
i.putExtra("data",editText.getText().toString());
setResult(1,i);
finish();
}
});
}
}
在A Activity中
startActivityForResult(i,0);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
textView.setText("返回的值："+data.getStringExtra("data"));
}