以编程方式设置TextView的布局权重

// 创建一个新的TextView
TextView textView = new TextView(this);
textView.setText("Hello World!");

// 创建一个新的LinearLayout.LayoutParams
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
    LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

// 设置布局权重
layoutParams.weight = 1.0f;

// 将布局参数应用于TextView
textView.setLayoutParams(layoutParams);

// 将TextView添加到布局中
LinearLayout linearLayout = findViewById(R.id.my_linear_layout);
linearLayout.addView(textView);