使用“startActivityForResult”无法启动第二个活动

Question

使用“startActivityForResult”无法启动第二个活动

3

同标题：我已经尝试使用“startActivity”，但是结果相同。当我按下fab按钮时，它显示HomeActivity。希望你能帮助我。

想从这里发送人员列表。

主页活动：

public class HomeActivity extends AppCompatActivity {

private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
public ArrayList result = new ArrayList();

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == 0 && resultCode == RESULT_OK && data!=null){
        result = data.getParcelableArrayListExtra("list_modified");
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    FloatingActionButton fab = (FloatingActionButton)findViewById(R.id.fab);
    Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    mRecyclerView = (RecyclerView) findViewById(R.id.rv);

    // use this setting to improve performance if you know that changes
    // in content do not change the layout size of the RecyclerView
    mRecyclerView.setHasFixedSize(true);
    mRecyclerView.setItemAnimator(new ScaleInBottomAnimator());

    // use a linear layout manager
    mLayoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(mLayoutManager);

    // specify an adapter (see also next example)
    mAdapter = new MyAdapter(createList(0));
    mRecyclerView.setAdapter(mAdapter);
    fab.attachToRecyclerView(mRecyclerView);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(HomeActivity.this, CreateNewPerson.class);
            i.putExtra("list", result);
            startActivityForResult(i, 0);
            mAdapter.notifyDataSetChanged();
        }
    });


}
private List createList(int size) {

    for (int i=1; i <= size; i++) {
        Person p = new Person("Name"+ i, "Surname" + i, R.drawable.ic_action_account_box);
        result.add(p);
    }
    return result;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_home, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

修改这里的内容并尝试使用新人物刷新我的RecyclerView。

SecondActivity：

public class CreateNewPerson extends AppCompatActivity {
EditText e1;
EditText e2;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.new_person);
    Bundle extra= getIntent().getExtras();
    ArrayList<Person> list = (ArrayList) extra.getParcelableArrayList("list");
    e1 = (EditText)findViewById(R.id.editName);
    e2 = (EditText)findViewById(R.id.editSurname);
    Person p = new Person(e1.toString(), e2.toString(), R.drawable.ic_action_account_box);
    list.add(p);
    Intent output = new Intent();
    output.putExtra("list_modified", list);
    setResult(RESULT_OK, output);
    finish();

}

}

- Marco

但你在开始第二个活动时就完成了它（请检查 finish()）. - Mariano Zorrilla

是的，你说得对，但我遵循了这个https://dev59.com/XnNA5IYBdhLWcg3wh-gC#13362722 上的建议，它说必须包含finish。 - Marco

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- Faiyaz · Accepted Answer

请将您的第二个活动代码替换为以下内容。

public class CreateNewPerson extends AppCompatActivity {
EditText e1;
EditText e2;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.new_person);
    Bundle extra= getIntent().getExtras();
    ArrayList<Person> list = (ArrayList) extra.getParcelableArrayList("list");
    e1 = (EditText)findViewById(R.id.editName);
    e2 = (EditText)findViewById(R.id.editSurname);
    Person p = new Person(e1.toString(), e2.toString(), R.drawable.ic_action_account_box);
    list.add(p);
    Intent output = new Intent();
    output.putExtra("list_modified", list);
    setResult(RESULT_OK, output);
}

}