Android简单计算器界面实现

XML文件：

<?xml version="1.0" encoding="utf-8"?>

MainActivity:

package learn.li.com.learnthree;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Gravity;import android.widget.Button;import android.widget.GridLayout;import android.widget.TextView;import java.util.Timer;import java.util.TimerTask;public class MainActivity extends AppCompatActivity {    GridLayout gridLayout;    String[] chars = new String[]{              "7","8","9","÷",              "4","5","6","x",              "1","2","3","-",              ".","0","=","="    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        gridLayout = (GridLayout)findViewById(R.id.root);        for(int i = 0;i < chars.length;i++){            Button bn = new Button(this);            bn.setText(chars[i]);            bn.setTextSize(40);            bn.setPadding(5,35,5,35);            GridLayout.Spec rowSpec = GridLayout.spec(i/4 + 2);            GridLayout.Spec columnSpec = GridLayout.spec(i%4);            GridLayout.LayoutParams params = new GridLayout.LayoutParams(rowSpec,columnSpec);            params.setGravity(Gravity.FILL);            gridLayout.addView(bn,params);        }    }}

效果：

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