我想从第一个活动转到第二个活动,然后从第二个活动转到第三个活动。在第三个活动中,我想在EditText中输入名称,然后在按下按钮后转到第一个活动,同时发送在第三个活动中输入的信息。

我遇到了两种情况,第一种情况:finish()方法以调用super.finish()结尾。不幸的是,在这种情况下,我没有返回第一个活动,而是返回了第二个活动。

第二种情况:finish()方法以startActivity(i)调用结束。不幸的是,在这种情况下,不会调用MainActivity-onActivityResult中的方法,这将导致在第三个活动中输入的数据不足。

我通常如何从第三项活动中接收数据?

这是我的代码:

第一:

public class MainActivity extends AppCompatActivity {

    TextView textViewInformation;
    Button button_GoToSecond;

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

        textViewInformation = findViewById(R.id.textView);
        button_GoToSecond = findViewById(R.id.button);

        button_GoToSecond.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent i = new Intent(MainActivity.this, Second.class);
                startActivity(i);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent i) {

        if((requestCode == 1) &&(resultCode == RESULT_OK)) {

            String name = i.getStringExtra("name");
            textViewInformation.setText(name);
        }
    }
}


第二:

public class Second extends AppCompatActivity {

    Button button_GoToThird;

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

        button_GoToThird = findViewById(R.id.button2);

        button_GoToThird.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent i = new Intent(Second.this, Third.class);
                startActivity(i);
            }
        });
    }
}


第三(第一版):

public class Third extends AppCompatActivity {

    EditText editText_Data;
    Button button_SendData;

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

        editText_Data = findViewById(R.id.editText);
        button_SendData = findViewById(R.id.button3);

        button_SendData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                finish();
            }
        });

    }

    public void finish() {

        String name;
        name = editText_Data.getText().toString();

        Intent i = new Intent(Third.this, MainActivity.class);
        i.putExtra("name", name);

        setResult(RESULT_OK, i);
        super.finish();
    }
}


第三(第二版):

public class Third extends AppCompatActivity {

    EditText editText_Data;
    Button button_SendData;

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

        editText_Data = findViewById(R.id.editText);
        button_SendData = findViewById(R.id.button3);

        button_SendData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                finish();
            }
        });

    }

    public void finish() {

        String name;
        name = editText_Data.getText().toString();

        Intent i = new Intent(Third.this, MainActivity.class);
        i.putExtra("name", name);

        setResult(RESULT_OK, i);
        startActivity(i);
    }

最佳答案

将您的finish方法更改为:

public void finish() {

    String name;
    name = editText_Data.getText().toString();

    Intent i = new Intent(Third.this, MainActivity.class);
     Bundle bundle = new Bundle();
     bundle.putString("name", name);

    startActivityForResult(i, RESULT_OK, bundle);
}

07-28 01:51
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