Question

我的问题是，当我尝试在下面的代码中设置service1和service1Health的文本时，文本未被设置。关于为什么会发生这种情况的任何想法？ service1Name和service1HealthValue都具有有效的字符串值。

public void onClick(View v) 
{

    switch(v.getId())
    {
    case R.id.loginButton:
        String[] values = new String[2];
        String usernameText = ((TextView) activity.findViewById(R.id.usernameTextBox)).getText().toString();
        String passwordText = ((TextView) activity.findViewById(R.id.txtPasswordField)).getText().toString();

        if (usernameText.length()==0 || passwordText.length()==0)
            Toast.makeText(activity, "Please fill in both username and password fields", Toast.LENGTH_SHORT).show();
        else
        {
            Toast.makeText(activity, "Connecting to server", Toast.LENGTH_LONG).show();
            String loginResult = Server.login(usernameText,passwordText);

            values = loginResult.split(",");

            Intent i = new Intent(activity,Home.class);
            activity.startActivity(i);
            activity.setContentView(R.layout.home);

            String service1Name = Server.getServices("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
            String service1HealthValue = Server.getHealth("myservice","xxxxxxxxxxxxxxxxxxxxxxxxxxx");


            TextView service1= ((TextView) activity.findViewById(R.id.serviceName1));
            TextView service1Health= ((TextView) activity.findViewById(R.id.service1Health));


            service1.setText(service1Name);
            service1Health.setText(service1HealthValue);

        }
        break;
    }
}

Answer 1

当您致电activity.startActivity(i);时，它会启动一项新活动，因此无法访问此后的任何代码，包括activity.setContentView(R.layout.home);，因此这些TextViews都不会设置。如果要在新活动中设置这些值，则应将其添加到Intent，然后在新onCreate的{{1}}方法中重新打开它们。例如，在您当前的活动中：

Activity

在Intent i = new Intent(activity,Home.class); i.putExtra("service1Name", Server.getServices("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")); i.putExtra("service1HealthValue", Server.getHealth("myservice","xxxxxxxxxxxxxxxxxxxxxxxxxxx")); activity.startActivity(i);的onCreate方法中，添加以下内容：

Home.java

文本视图未在Android中设置文本

1 个答案: