Activity系列：startActivityForResult的用法

Posted 2021-06-12 zhangjin1120

模拟一个使用场景，从MainActivity跳转到ChangeNameActivity，修改客户姓名后，把修改的结果返回给MainActivity。

MainActivity代码

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "xx";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void changeName(View view) {
        Intent intent = new Intent(this, ChangeNameActivity.class);
        startActivityForResult(intent,99);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i(TAG, "onActivityResult: " + requestCode + " " + resultCode + " " + data.getStringExtra("hh"));
    }
}

ChangeNameActivity代码

public class ChangeNameActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_change_name);
    }

    public void changeSuccess(View view) {

        Intent intent = new Intent();
        intent.putExtra("hh", "刘德华");
        setResult(RESULT_OK,intent);

        finish(); //必须调用finish()，并且setResult()必须在finish之前
    }
}