2个activity 之间的数据传递

初学android，小小的学习总结

1.通过intent来传递:
A.传字符等：activity1中设置：

String text = "hello";
	Intent intent1 = new Intent(ActivityMain.this, Activity2.class);
	intent1.putExtra("activity1", text);
	startActivity(intent1 );

B.传对象，对象要实例化，继承Serializable

Bundle mbundle=new Bundle();			mbundle.putSerializable("user",userList.get(position));
Intent in =new Intent (getApplicationContext(), activity2.class);
in.putExtras(mbundle);
startActivity(in);

activity2中接收：
        
A:接收

Bundle extras = getIntent().getExtras();
	        if (extras != null) {
	            textview.setText(extras.getString("activity1"));
	        }

B.接收 

 Bundle bundel = getIntent().getExtras();
         user= (User) bundel.get("user"); 

2.SharedPreferences

我在activity1中设置的如下：

SharedPreferences sp =getSharedPreferences("textinfo",0);
 	Editor editor=sp.edit();
	String text = "hello";
	editor.putString("text", text);
	editor.commit();

	Intent i = new Intent(getApplicationContext(),activity2.class);
	startActivity(i);

跳转到Message的activity，获取内容如下

SharedPreferences share=getSharedPreferences("textinfo",0);
		String text =share.getString("text", null);
		msgtextview.setText(text);