intent参数的回传

1.

public class MainActivity extends Activity {

    private EditText editText1, editText2, editText3;

    private Button button;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button = (Button) this.findViewById(R.id.button1);

        editText1 = (EditText) this.findViewById(R.id.editText1);

        editText2 = (EditText) this.findViewById(R.id.editText2);

        editText3 = (EditText) this.findViewById(R.id.editText3);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Intent intent = new Intent(MainActivity.this,

                        NextActivity.class);

                String a = editText1.getText().toString().trim();

                String b = editText2.getText().toString().trim();

                intent.putExtra("message", a + "+" + b + "=" + "?");

                startActivityForResult(intent, 1000);

            }

        });

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        // TODO Auto-generated method stub

        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode==1000&&resultCode==1001){

            editText3.setText(data.getStringExtra("result"));

        }

    }

2.

protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.next);

        button=(Button)this.findViewById(R.id.button1);

        textView=(TextView)this.findViewById(R.id.textView1);

        editText=(EditText)this.findViewById(R.id.editText1);

        Intent intent=getIntent();

        String message=intent.getStringExtra("message");

        textView.setText(message);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                String result=editText.getText().toString().trim();

                Intent intent=new Intent();

                intent.putExtra("result", result);

                //参数回传

                setResult(1001, intent);

                finish();

            }

        });

    }

说明：用startActivityForResult(intent, 1000);启动intent ，重写onActivityResult方法，在跳转的activity中用setResult(1001, intent);返回，并finish()结束