我们需要创建2个Activity，一个是A，一个是B。
简单的值传递
A的activity组织要传输给B的数据。
Intent i = new Intent(AMainActivity.this,BMainActivity.class);此行代码创建Intent对象，然后用于传输数据。
package com.example.testapp;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
public class AMainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_amain);
findViewById(R.id.button1).setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(AMainActivity.this,
BMainActivity.class);
// 传参数
i.putExtra("name", "gaopeng");
startActivity(i);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.amain, menu);
return true;
}
}
B的Activity接收A传过来的数据，通过i.getStringExtra(“name”)获取数值。
package com.example.testapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;
public class BMainActivity extends Activity {
private TextView t;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bmain);
t = (TextView) findViewById(R.id.tv);
Intent i = getIntent();
t.setText(i.getStringExtra("name"));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.bmain, menu);
return true;
}
}
数据传输包Bundle
A的Activity，代码中我们用到了Bundle类，有点类似我们java中的map集合的用法。
使用putExtras或者putExtra方法将数据包放入到传输对象中。两个方法区别，一个是直接放入，另外一个是将数据包起一个别名，类似于KV的存储格式。
package com.example.testapp;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
public class AMainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_amain);
findViewById(R.id.button1).setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(AMainActivity.this,
BMainActivity.class);
Bundle b = new Bundle();
b.putString("name", "gaopeng");
b.putInt("age", 28);
// i.putExtras(b);
i.putExtra("user", b);
startActivity(i);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.amain, menu);
return true;
}
}
B的Activity，通过getBundleExtra或getExtras方法渠道Bundle对象，然后按照存放时候的名字，取出数值。
package com.example.testapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;
public class BMainActivity extends Activity {
private TextView t;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bmain);
t = (TextView) findViewById(R.id.tv);
Intent i = getIntent();
Bundle b = i.getBundleExtra("user");
// Bundle b = i.getExtras();
t.setText("name=" + b.getString("name") + ",age=" + b.getInt("age"));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.bmain, menu);
return true;
}
}
传输对象
既然是传输对象，那么我们就需要创建一个对象类。
对象类需要实现序列化接口，这里我实现的是Serializable接口，Android有自带的序列化接口Parcelable，下一篇博文，我详细说明差异及用法。
package com.example.testapp;
import java.io.Serializable;
import android.os.Parcel;
import android.os.Parcelable;
public class User implements Serializable {
// public class User implements Parcelable{
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
User(String name, int age) {
this.name = name;
this.age = age;
}
}
A的Activity，
package com.example.testapp;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
public class AMainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_amain);
findViewById(R.id.button1).setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(AMainActivity.this,
BMainActivity.class);
i.putExtra("user", new User("lijingwei", 25));
startActivity(i);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.amain, menu);
return true;
}
}
B的Activity，通过getSerializableExtra获取对象。这种方式在我们以后的开发中应该会经常被用到。符合我们java面向对象的开发。
package com.example.testapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;
public class BMainActivity extends Activity {
private TextView t;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bmain);
t = (TextView) findViewById(R.id.tv);
Intent i = getIntent();
User user = (User) i.getSerializableExtra("user");
t.setText("name=" + user.getName() + ",age=" + user.getAge());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.bmain, menu);
return true;
}
}
附上运行时的截图
A的Activity界面
B的Activity界面
时间： 2024-11-12 19:54:41