如何在不在xml中的代码中设置RelativeLayout布局参数？

5 回答

• 266

  只是一个基本的例子：

  RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
  params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
  Button button1;
  button1.setLayoutParams(params);
  
  params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
  params.addRule(RelativeLayout.RIGHT_OF, button1.getId());
  Button button2;
  button2.setLayoutParams(params);
  

  如您所见，这是您必须做的：

  • 创建 RelativeLayout.LayoutParams 对象 .

  • 使用 addRule(int) 或 addRule(int, int) 设置规则 . 第一种方法用于添加不需要值的规则 .

  • 将参数设置为视图（在本例中为每个按钮） .

  回复于 2024-05-17T19:26:15+08:00
• 0

  RelativeLayout layout = new RelativeLayout(this);
      RelativeLayout.LayoutParams labelLayoutParams = new RelativeLayout.LayoutParams(
              LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
      layout.setLayoutParams(labelLayoutParams);
  
  
     // If you want to add some controls in this Relative Layout
      labelLayoutParams = new RelativeLayout.LayoutParams(
              LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
      labelLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
  
  
      ImageView mImage = new ImageView(this);
      mImage.setBackgroundResource(R.drawable.popupnew_bg);        
      layout.addView(mImage,labelLayoutParams);
  
      setContentView(layout);
  

  回复于 2024-05-17T19:26:15+08:00
• 6

  像这样的东西......

  RelativeLayout linearLayout = (RelativeLayout) findViewById(R.id.widget43);
                  // ListView listView = (ListView) findViewById(R.id.ListView01);
  
                  LayoutInflater inflater = (LayoutInflater) this
                          .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                  // View footer = inflater.inflate(R.layout.footer, null);
                  View footer = LayoutInflater.from(this).inflate(R.layout.footer,
                          null);
                  final RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
                          RelativeLayout.LayoutParams.FILL_PARENT,
                          RelativeLayout.LayoutParams.FILL_PARENT);
                  layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, 1);
  footer.setLayoutParams(layoutParams);
  

  回复于 2024-05-17T19:26:15+08:00
• 4

  如果您创建它，只需从视图本身拉出布局参数即可 .

  $((RelativeLayout)findViewById(R.id.imageButton1)).getLayoutParams();
  

  回复于 2024-05-17T19:26:15+08:00
• 17

  我希望下面的代码会有所帮助 . 它将创建一个EditText和一个Log In按钮 . 两者都相对而言 . 全部在MainActivity.java中完成 .

  package com.example.atul.allison;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.widget.RelativeLayout;
  import android.widget.Button;
  import android.graphics.Color;
  import android.widget.EditText;
  import android.content.res.Resources;
  import android.util.TypedValue;     
      public class MainActivity extends AppCompatActivity {
  
          @Override
          protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              //Layout
              RelativeLayout atulsLayout = new RelativeLayout(this);
              atulsLayout.setBackgroundColor(Color.GREEN);
  
              //Button
              Button redButton = new Button(this);
              redButton.setText("Log In");
              redButton.setBackgroundColor(Color.RED);
  
              //Username input
              EditText username =  new EditText(this);
  
              redButton.setId(1);
              username.setId(2);
  
              RelativeLayout.LayoutParams buttonDetails= new RelativeLayout.LayoutParams(
                      RelativeLayout.LayoutParams.WRAP_CONTENT,
                      RelativeLayout.LayoutParams.WRAP_CONTENT
              );
  
              RelativeLayout.LayoutParams usernameDetails= new RelativeLayout.LayoutParams(
                      RelativeLayout.LayoutParams.WRAP_CONTENT,
                      RelativeLayout.LayoutParams.WRAP_CONTENT
              );
  
              //give rules to position widgets
              usernameDetails.addRule(RelativeLayout.ABOVE,redButton.getId());
              usernameDetails.addRule(RelativeLayout.CENTER_HORIZONTAL);
              usernameDetails.setMargins(0,0,0,50);
  
              buttonDetails.addRule(RelativeLayout.CENTER_HORIZONTAL);
              buttonDetails.addRule(RelativeLayout.CENTER_VERTICAL);
  
              Resources r = getResources();
              int px = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 200,r.getDisplayMetrics());
              username.setWidth(px);
  
              //Add widget to layout(button is now a child of layout)
              atulsLayout.addView(redButton,buttonDetails);
              atulsLayout.addView(username,usernameDetails);
  
              //Set these activities content/display to this view
              setContentView(atulsLayout);
          }
      }
  

  回复于 2024-05-17T19:26:15+08:00