Question

我新建了一个对象int avtivity1.I想将它传输给activity2.And只传输引用，而不是复制它。我需要怎么做？

public class MyActivity1 extends Activity{
public void onCreate(Bundle saveInstanceState){
    super.onCreate(saveInstanceState);
    setContentView(R.layout.main);

    myButton1 = (Button)findViewById(R.id.ButtonId1);
    myButton1.setText("goto");
    myButton1.setOnClickListener(new Button.OnClickListener(){
        public void onClick(View v){

            MyObject myObject = new MyObject();
            //how to transmit the object reference to OtherActiviy
            //I want only transmit,not copy the object

            Intent intent = new Intent();
            intent.setClass(MyActivity1.this, OtherActiviy.class);
            startActivity(intent);
        }
    });
}

}

Answer 1

您可以将扩展Parcelable或Serialization的Object放入intent中。或者一个糟糕的方法是在Activity1上将对象解析为String by Gson，并将String转换为Activity2上的对象。

Answer 2

你可以这样做：

  public class MyActivity1 extends Activity{
  public void onCreate(Bundle saveInstanceState){
    super.onCreate(saveInstanceState);
    setContentView(R.layout.main);

    myButton1 = (Button)findViewById(R.id.ButtonId1);
    myButton1.setText("goto");
    myButton1.setOnClickListener(new Button.OnClickListener(){
        public void onClick(View v){


             MyObject myObject = new MyObject();
            //how to transmit the object reference to OtherActiviy
            //I want only transmit,not copy the object

            Intent intent = new Intent();
            intent.putExtra("MYObject",myObject);
            intent.setClass(MyActivity1.this, OtherActiviy.class);
            startActivity(intent);
        }
    });
}

注意：myObject应该是可以分配的。

如何在活动之间传输对象引用

2 个答案: