Question

我有一个设置文本，应该更新捐赠的金额。到目前为止，这是所有捐款的总和。在我的捐赠活动中，当按下捐赠按钮时，我会更新一个数字，该数字包含迄今为止的捐赠总额。然后使用getter我从捐赠活动中获取数字到我的主要活动，并将文本设置为数字，但数字不会更新。我有一种感觉，可能是因为我不刷新文字，但我不确定。如果是，那么我不知道如何说，当点击捐赠按钮时，在不同的激活中设置文本。捐赠活动：

public class DonationAmount extends AppCompatActivity {
public static double donateAmount = 0;
TextView donateAmountView;
Button donateButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_donation_amount);
    donateButton = (Button) findViewById(R.id.donate);
    donateAmountView = (TextView) findViewById(R.id.donateAmount);
    donateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            donateAmount += Double.parseDouble(donateAmountView.getText().toString());
        }
    });
}
public static double getDonateAmount() {
    return donateAmount;
}

}

主要活动

public class MainActivity extends AppCompatActivity {
TextView totalDonations;
private String mercheantKey, userCredentials;
private PaymentParams paymentParams;
private PayuConfig payuConfig;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    totalDonations = (TextView) findViewById(R.id.totalDonation);
    final FloatingActionButton donateButton = (FloatingActionButton) findViewById(R.id.fab);
    donateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent donateActivity = new Intent(MainActivity.this, DonationAmount.class);
            startActivity(donateActivity);
            totalDonations.setText(Double.toString(DonationAmount.getDonateAmount()));
        }
    });
}

Answer 1

当按钮单击调用时，方法会在调用活动之前输入setText，如下面的代码

donateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
totalDonations.setText(Double.toString(DonationAmount.getDonateAmount()));
            Intent donateActivity = new Intent(MainActivity.this, DonationAmount.class);
            startActivity(donateActivity);

        }
    });

设置文字不起作用？

1 个答案: