Activity之间的传值

第一种方式使用Intent

Intent intent = new Intent(MainActivity.this,Main2Activity.class);
intent.putExtra("name","zhangsan"); 
startActivity(intent);
//接收数据
Intent intent = getIntent();
String value = intent.getStringExtra("name");
TextView textView = (TextView)findViewById(R.id.textView1);textView.setText(value);

第二种方式使用Intent结合Bundle

Intent intent = new Intent(MainActivity.this,Main2Activity.class);                
Bundle b = new Bundle(); 
b.putString("name","李四"); b.putInt("age",30);
intent.putExtras(b);
startActivity(intent);
 //接收数据
 Intent intent = getIntent();Bundle data = intent.getExtras();
TextView textView = (TextView)findViewById(R.id.textView1);textView.setText(String.format("name=%s,age=%d",data.getString("name"),data.getInt("age")));

第三种方式传值，传自定义对象实现(实现Serializable接口，性能较差，系统自动处理)

Intent intent = new Intent(MainActivity.this,Main2Activity.class); 
intent.putExtra("user",new User("linqin",30)); 
startActivity(intent);
//接收数据
Intent intent = getIntent();
User user = (User)intent.getSerializableExtra("user");
TextView textView = (TextView)findViewById(R.id.textView1);
textView.setText(String.format("User info name = %s,age=%d",user.getName(),user.getAge()));
//对象代码
  public class User implements Serializable { 
   private String name; 
   private Integer age; 
   public Integer getAge() {
      return age;
    } 
    public void setAge(Integer age) {
      this.age = age; 
   } 
   public String getName() {
       return name;
   } 
   public void setName(String name) {
        this.name = name;
    }
  public User(String name,Integer age){ 
   this.name = name;
    this.age = age; 
   }
}

第四种种方式传值，传自定义对象(实现Parcelable接口，性能较好)

Intent intent = new Intent(MainActivity.this,Main2Activity.class); 
intent.putExtra("user",new User("linqin",30)); 
startActivity(intent);
//接收数据
Intent intent = getIntent();
User user = (User)intent.getParcelableExtra("user");
TextView textView = (TextView)findViewById(R.id.textView1);
textView.setText(String.format("User info name =  %s,age=%d",user.getName(),user.getAge()));
//对象代码
public class User implements Parcelable { 
   private String name; 
   private Integer age; 
   public Integer getAge() {
      return age;
    } 
    public void setAge(Integer age) {
      this.age = age; 
   } 
   public String getName() {
       return name;
   } 
   public void setName(String name) {
        this.name = name;
    }
  public User(String name,Integer age){ 
   this.name = name;
    this.age = age; 
   }
  @Override
   public int describeContents() {
      return 0; 
   }  
  @Override
  public void writeToParcel(Parcel dest, int flags) {  
      //多个同类型属性使用Bundle 
       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];
    } 
 };
}