UI复习-布局管理器GridLayout(计算器界面)

1>GridLayout，4.0版本以上新增的网格布局，以下版本需要引用支撑包

package com.brady.est;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.GridLayout.LayoutParams;

@SuppressLint("HandlerLeak")
public class MainActivity extends ActionBarActivity {

    private String[] buttons={
            "1","2","3","+",
            "4","5","6","-",
            "7","8","9","x",
            "0",".","/","="};

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

        GridLayout gridLayout = (GridLayout)findViewById(R.id.root);

        for(int i = 0 ;i<gridLayout.getRowCount()-2;i++){

            //按键所在的单元格 行
            //从第三行开始
            GridLayout.Spec rowSpec = GridLayout.spec(i%gridLayout.getRowCount()+2);

            for(int j = 0;j<gridLayout.getColumnCount();j++){

                Button button = new Button(this);
                button.setText(buttons[i*4+j]);
                button.setTextSize(40);

                //按键所在的单元格 列
                GridLayout.Spec colSpec = GridLayout.spec(j%gridLayout.getColumnCount());

                //该单元格布局
                GridLayout.LayoutParams layoutParams = new GridLayout.LayoutParams(rowSpec, colSpec);
                layoutParams.setGravity(Gravity.FILL);
                //向网格组件 添加子组件button以及，该button的布局参数对象
                gridLayout.addView(button, layoutParams);
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

布局XML文件:

<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnCount="4"
    android:rowCount="6"
    android:id="@+id/root"
    tools:context="com.brady.est.MainActivity" >
   <TextView
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="0"
       android:layout_columnSpan="4"/>
   <Button
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:layout_columnSpan="4"
       android:text="清除"/>

</GridLayout>

界面: