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文本视图未在Android中设置文本

[英]Text View not setting text in Android

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;
    }
}

当你调用activity.startActivity(i); ,它启动一个新的活动,所以在此之后的任何代码,包括activity.setContentView(R.layout.home); 将无法访问,因此这些TextViews都不会被设置。 如果要在新活动中设置这些值,则应将它们添加到Intent ,然后在新ActivityonCreate方法中重新打开它们。 例如,在您当前的活动中:

Intent i = new Intent(activity,Home.class);
i.putExtra("service1Name", Server.getServices("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"));
i.putExtra("service1HealthValue", Server.getHealth("myservice","xxxxxxxxxxxxxxxxxxxxxxxxxxx"));
activity.startActivity(i);

Home.java的onCreate方法中,添加以下内容:

setContentView(R.layout.home);
Intent i = getIntent();
if (i != null) {
    //This means that the intent passed here was found
    String serviceName1 = i.getStringExtra("serviceName1");
    String service1HealthValue = i.getStringExtra("service1HealthValue");
    TextView service1= ((TextView) activity.findViewById(R.id.serviceName1));
    TextView service1Health= ((TextView) activity.findViewById(R.id.service1Health));
    service1.setText(service1Name);
    service1Health.setText(service1HealthValue);
}

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