安卓学习-界面-布局-GridLayout

package com.example.dddd;

import android.app.Activity;
import android.graphics.Point;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.Button;
import android.widget.GridLayout;

public class MainActivity extends Activity {

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

GridLayout gl=(GridLayout)findViewById(R.id.root);
String[] aa=new String[]{
"1","2","3","+",
"4","5","6","-",
"7","8","9","*",
".","0","=","/"};

Point size = new Point();

getWindowManager().getDefaultDisplay().getSize(size);

for(int i=0;i<aa.length;i++){
GridLayout.Spec column=GridLayout.spec(i%4);
GridLayout.Spec row=GridLayout.spec(i/4+2);
GridLayout.LayoutParams params=new GridLayout.LayoutParams(row, column);
//params.setGravity(Gravity.FILL);

Button btn=new Button(this);
btn.setText(aa[i]);
btn.setWidth((int) (size.x * 0.25));
btn.setHeight((int) (size.x * 0.25));
gl.addView(btn,params);

}

}
}