如何使用意图将数据从一个活动传递到另一个活动？ [复制]

Question

在这里，我编写了一个代码，通过使用意图将数据从一个活动传递到另一个活动。如果我需要在我的代码中进行任何更正，请告诉我。

   OnClickListener buttonListener = new OnClickListener() {

    @Override
    public void onClick(View arg0) {

        Intent nextIntent = new Intent(getApplicationContext(), SecondActivity.class);
        nextIntent.putExtra("firstname", "Siva");
        nextIntent.putExtra("Secondname", "Kumar");
        startActivity(nextIntent);


        Toast.makeText(getApplicationContext(),"SignIn Button Clicked", Toast.LENGTH_SHORT).show();
    }
};

第二个活动：

OnClickListener backListener = new OnClickListener() {

    @Override
    public void onClick(View v) {

        Intent backIntent = new Intent(getApplicationContext(), MainActivity.class);
        Intent receivedIntent = getIntent();
        Bundle bundleData = receivedIntent.getExtras();
        bundleData.getString("firstname");
        bundleData.getString("secondname");
        startActivity(backIntent);
    }
};

Answer 1

你应该这样尝试

1. 将数据传递给 SecondActivity

   Intent nextIntent = new Intent(getApplicationContext(), SecondActivity.class);
   nextIntent.putExtra("firstname", "Siva");
   nextIntent.putExtra("Secondname", "Kumar");
   startActivity(nextIntent);
   

2. 在 SecondActivity 中获取数据

   Intent receivedIntent = getIntent();
   String firstname=receivedIntent.getStringExtra("firstname");
   String secondname=receivedIntent.getStringExtra("Secondname");
   

编辑

SecondActivity.jaja

public class SecondActivity extends Activity {



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
    Intent receivedIntent = getIntent();
    String firstname=receivedIntent.getStringExtra("firstname");
    String secondname=receivedIntent.getStringExtra("Secondname");

    TextView txtFirst=(TextView)findViewById(R.id.text1);
    txtFirst.setText(firstname);
    TextView txtSecond=(TextView)findViewById(R.id.text2);
    txtSecond.setText(secondname);
    Button back=(Button)findViewById(R.id.backbutton);
    back.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
        finish();


        }
    });

}

}

Answer 2

使用一些字符串变量，如下所示，

OnClickListener backListener = new OnClickListener() {

    @Override
    public void onClick(View v) {

        Intent backIntent = new Intent(getApplicationContext(), MainActivity.class);
        Intent receivedIntent = getIntent();
        String firstName = getIntent().getStringExtra("firstname");
        String secondName = getIntent().getStringExtra("Secondname");
        startActivity(backIntent);
    }
};

现在您的两个字符串变量 firstName 和 secondName 包含您需要的信息。