我正在制作我的应用程序的首页。不幸的是,只有TextView
不会显示。按钮和背景运行得很好。我什至将它添加到相对布局中,但使用了该addView()
函数。有人可以帮忙吗?
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//layout
RelativeLayout mainLayout = new RelativeLayout(this);
mainLayout.setBackgroundColor(Color.BLUE);
//button
Button mainButton = new Button (this);
mainButton.setText("Next");
mainButton.setBackgroundColor(Color.RED);
//textview
TextView mainTextView = new TextView(this);
mainTextView.setText("Juliet Daniel Lab Molecular Biology Cancer Research Center");
mainTextView.setTextSize(30);
mainTextView.setBackgroundColor(Color.GREEN);
//sizing the button
RelativeLayout.LayoutParams btnDetails = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT
);
//sizing the textview
RelativeLayout.LayoutParams textViewDetails = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT
);
//give id's to position relatively...note it is preferable to do this in the res folder to avoid errors
mainButton.setId(1);
mainTextView.setId(2);
//give rules to position widgets relatively
textViewDetails.addRule(RelativeLayout.ABOVE, mainButton.getId());
textViewDetails.addRule(RelativeLayout.CENTER_HORIZONTAL);
textViewDetails.setMargins(0,0,0,50);
//adding the button as a part of the RelativeLayout (ADDING THE BUTTON WIDGET TO LAYOUT)
mainLayout.addView(mainButton, btnDetails);
//adding the textview as a part of the relative Layout
mainLayout.addView(mainTextView, textViewDetails);
//setting the view as out layour
setContentView(mainLayout);
}
}
这是因为你textview
在按钮button
上方设置了根布局的第一个顶部,这就是为什么它没有显示尝试设置textview
在按钮下方并且它的工作
textViewDetails.addRule(RelativeLayout.BELOW, mainButton.getId());
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我来说两句