Android - Intent - 传递数据

1. 主叫Activity向被叫Activity传递数据：

（1）主叫Activity写数据：

Intent intent = new Intent(action);intent.putExtra("key", "value");startActivity(intent);

（2）被叫Activity读数据：

Intent intent = getIntent();String strFromCaller = intent.getStringExtra("key");

2. 被叫Activity向主叫Activity放回数据：

（1）主叫Activity以startActivityForResult()方式启动被叫Activity：

Intent intent = new Intent();intent.setClass(getApplicationContext(), NewAcitvity.class);// START_NEWACTIVITY is a predefined constant to identify the Activity invoked by this intent.startActivityForResult(intent, START_NEWACTIVITY);

（2）被叫Activity写数据：

Uri uri = Uri.parse("back info");Intent data = new Intent(null, uri);data.putExtra("key", "value");setResult(Activity.RESULT_OK, data);

（3）主叫Activity读数据：

@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data){super.onActivityResult(requestCode, resultCode, data);switch (requestCode){case START_NEWACTIVITY:if (resultCode == Activity.RESULT_OK){Toast.makeText(this, data.getStringExtra("key"), Toast.LENGTH_LONG).show();//Toast.makeText(this, data.getData().toString(), Toast.LENGTH_LONG).show();}break;}}