单位和尺寸

package a.b.c.layoutparams;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout linearLayout = new LinearLayout(this);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT);
        linearLayout.setLayoutParams(layoutParams);

        TextView textView = new TextView(this);
        textView.setText("我是文本");
        textView.setBackgroundColor(0xffff0000);
        LinearLayout.LayoutParams textLayoutParams = new LinearLayout.LayoutParams(300,300);
        textView.setLayoutParams(textLayoutParams);
        linearLayout.addView(textView);
        setContentView(linearLayout);

    }
}