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android - TextView 未显示在 RelativeLayout 中

转载 作者:行者123 更新时间:2023-11-29 19:38:58 28 4
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我正在尝试从 Java 动态构建 View ,但我很困惑为什么这不起作用。

TextView displayText 根本不显示在屏幕上。我不明白为什么它不会像上面那样用户输入他们的名字。

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

RelativeLayout ceriLayout = new RelativeLayout(this);

Button genButton = new Button(this);
genButton.setText("Press here");
genButton.setId(0);

TextView displayView = new TextView(this);
displayView.setText("What is going to go here huh");
displayView.setId(1);

EditText nameView = new EditText(this);
nameView.setText("Enter your name");
nameView.setId(2);

RelativeLayout.LayoutParams button = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT
);

RelativeLayout.LayoutParams name = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT
);
RelativeLayout.LayoutParams display;
display = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT
);

button.addRule(RelativeLayout.CENTER_HORIZONTAL);
button.addRule(RelativeLayout.CENTER_VERTICAL);

display.addRule(RelativeLayout.CENTER_HORIZONTAL);
display.addRule(RelativeLayout.ABOVE, nameView.getId());

name.addRule(RelativeLayout.CENTER_HORIZONTAL);
name.addRule(RelativeLayout.ABOVE, genButton.getId());



ceriLayout.addView(genButton, button);
ceriLayout.addView(nameView,name);

setContentView(ceriLayout);

}
}

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