这是布局文件中的代码,主要看TextView节点
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.iss.kcliu_14cauc.helloworld.LoginActivity">
<TextView
android:id="@+id/tv_hello"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.constraint.ConstraintLayout>
这是activity.java中的代码
public class LoginActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
TextView helloText = (TextView) findViewById(R.id.tv_hello);
helloText.setText("你好,世界,噜噜噜");
helloText.setTextColor(0x00ff00);
helloText.setTextSize(30);
}
}