android - 从 Activity A 到 Activity B 的值返回 null

Question

我正在尝试从 Activity B 获取信息到 Activity A，问题是我得到的值正在返回 null 出于某种原因。我的代码会查看您点击 Button 并将值返回到我的第一个 Activity 中的次数，至少这是它应该做的。如果有人看到我的错误请告诉我，我还有 5 个小时要上课:\

returned.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                Intent intent = new Intent(Next.this, Hw3Activity.class);
                intent.putExtra("text", counted.getText().toString());
                startActivity(intent);
/*Next is the current activity, Counted is the name of my text box*/
            }
        });
        click.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                counter++;
            }

这是我希望将信息传输到的 Activity。

Button change;
    TextView text;
    int number;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        change = (Button) findViewById(R.id.change);
        text = (TextView) findViewById(R.id.count);

        String s1 = getIntent().getStringExtra("Textview01");
        text.setText("You clicked the button " + s1 + " times.");

        change.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(), Next.class);
                startActivityForResult(intent, 0);
/*this button is for going to the 2nd activity,not my problem currently*/
            }
        });
    }

}

Answer 1

这是你做错的地方:

String s1 = getIntent().getStringExtra("Textview01");

我认为应该是:

String s1 = getIntent().getStringExtra("text");