移动软件开发 实习二 UI设计（一）

1. 完成一个计算器的设计，可以以手机自带的计算器为参考。设计过程中，注意考虑界面的美观性，不同机型的适应性，以及功能的完备性。
2. 注意结合Activity的生命周期，考虑不同情况下计算器的界面状态。
3. 如有余力，可以考虑实现一个高精度科学计算型的计算器。

MainActivity.java

package com.example.myapplication;

import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Button;
import android.util.Log;


public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    final static String Tag = "LifeCycle";
    EditText result;
    Button button_clean, button_divide, button_mutiply, button_cleanError,
            button_0, button_1, button_2, button_3, button_4, button_5, button_6, button_7, button_8, button_9,
            button_subtract, button_plus, button_equal, button_percent, button_point;
    boolean clear_flag;

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        setContentView(R.layout.testland);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testland);
        Log.i(Tag, "onCreate()");

        result = (EditText) findViewById(R.id.result);
        button_clean = (Button) findViewById(R.id.button_clean);
        button_divide = (Button) findViewById(R.id.button_divide);
        button_mutiply = (Button) findViewById(R.id.button_mutiply);
        button_cleanError = (Button) findViewById(R.id.button_cleanError);
        button_0 = (Button) findViewById(R.id.button_0);
        button_1 = (Button) findViewById(R.id.button_1);
        button_2 = (Button) findViewById(R.id.button_2);
        button_3 = (Button) findViewById(R.id.button_3);
        button_4 = (Button) findViewById(R.id.button_4);
        button_5 = (Button) findViewById(R.id.button_5);
        button_6 = (Button) findViewById(R.id.button_6);
        button_7 = (Button) findViewById(R.id.button_7);
        button_8 = (Button) findViewById(R.id.button_8);
        button_9 = (Button) findViewById(R.id.button_9);
        button_subtract = (Button) findViewById(R.id.button_subtract);
        button_plus = (Button) findViewById(R.id.button_plus);
        button_equal = (Button) findViewById(R.id.button_equal);
        button_percent = (Button) findViewById(R.id.button_percent);
        button_point = (Button) findViewById(R.id.button_point);

        result.setOnClickListener(this);
        button_clean.setOnClickListener(this);
        button_divide.setOnClickListener(this);
        button_mutiply.setOnClickListener(this);
        button_cleanError.setOnClickListener(this);
        button_0.setOnClickListener(this);
        button_1.setOnClickListener(this);
        button_2.setOnClickListener(this);
        button_3.setOnClickListener(this);
        button_4.setOnClickListener(this);
        button_5.setOnClickListener(this);
        button_6.setOnClickListener(this);
        button_7.setOnClickListener(this);
        button_8.setOnClickListener(this);
        button_9.setOnClickListener(this);
        button_subtract.setOnClickListener(this);
        button_plus.setOnClickListener(this);
        button_equal.setOnClickListener(this);
        button_percent.setOnClickListener(this);
        button_point.setOnClickListener(this);

    }
    @Override
    public void onStart(){
        super.onStart();
        Log.i(Tag,"onStart()");
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState){
        super.onRestoreInstanceState(savedInstanceState);
        Log.i(Tag,"onRestoreInstanceState()");
    }

    @Override
    public void onResume() {
        super.onResume();
        Log.i(Tag,"onResume()");
    }

    @Override
    public void onRestart(){
        super.onRestart();
        Log.i(Tag,"onRestart()");
    }

    @Override
    public void onPause(){
        super.onPause();
        Log.i(Tag,"onPause()");
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        Log.i(Tag,"onSaveInstanceState()");
    }

    @Override
    public void onStop(){
        super.onStop();
        Log.i(Tag,"onStop()");
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        Log.i(Tag,"onDestroy()");
    }

    @Override
    public void onClick(View view) {
        String str_result = result.getText().toString();
        switch (view.getId()) {
            case R.id.button_0:
            case R.id.button_1:
            case R.id.button_2:
            case R.id.button_3:
            case R.id.button_4:
            case R.id.button_5:
            case R.id.button_6:
            case R.id.button_7:
            case R.id.button_8:
            case R.id.button_9:
            case R.id.button_point:
                if (clear_flag) {
                    clear_flag = false;
                    str_result = "";
                    result.setText("");
                }
                result.setText(str_result + ((Button) view).getText());
                break;
            case R.id.button_divide:
            case R.id.button_mutiply:
            case R.id.button_subtract:
            case R.id.button_percent:
            case R.id.button_plus:
                if (clear_flag) {
                    clear_flag = false;
                    str_result = "";
                    result.setText("");
                }
                result.setText(str_result + " " + ((Button) view).getText() + " ");
                break;
            case R.id.button_clean:
                clear_flag = false;
                result.setText("");
                break;
            case R.id.button_cleanError:
                if (clear_flag) {
                    clear_flag = false;
                    str_result = "";
                    result.setText("");
                } else if (str_result != null && !str_result.equals("") && !str_result.endsWith(" "))//删除运算数
                    result.setText(str_result.substring(0, str_result.length() - 1));
                else if (str_result.endsWith(" "))//删除运算符
                    result.setText(str_result.substring(0, str_result.length() - 3));
                break;
            case R.id.button_equal:
                getResult();
                break;
            default:
                break;
        }
    }

    private void getResult() {
        String exp = result.getText().toString();
        if (exp == null || exp.equals("") || !exp.contains(" ")) {
            return;
        }

        if (clear_flag) {
            clear_flag = false;
            result.setText("");
        }
        clear_flag = true;
        double calculation = 0;
        String s1 = exp.substring(0, exp.indexOf(" "));//第一个运算数
        String op = exp.substring(exp.indexOf(" ") + 1, exp.indexOf(" ") + 2);//运算符
        String s2 = exp.substring(exp.indexOf(" ") + 3);//第二个运算数

        if (!s1.equals("") && !s2.equals("")) {
            double d1 = Double.parseDouble(s1);
            double d2 = Double.parseDouble(s2);

            if (op.equals("+")) {
                calculation = d1 + d2;
            } else if (op.equals("—")) {
                calculation = d1 - d2;
            } else if (op.equals("×")) {
                calculation = d1 * d2;
            } else if (op.equals("÷")) {
                if (d2 == 0) {
                    calculation = 0;
                } else {
                    calculation = d1 / d2;
                }
            }
            if (!s1.contains(".") && !s2.contains(".") && !op.equals("÷")) {
                int c = (int) calculation;
                result.setText(c + "");
            } else {
                result.setText(calculation + "");
            }
        } else if (!s1.equals("") && s2.equals("")) {
            result.setText(exp);
        } else if (s1.equals("") && !s2.equals("")) {
            double d2 = Double.parseDouble(s2);
            if (op.equals("+")) {
                calculation = 0 + d2;
            } else if (op.equals("—")) {
                calculation = 0 - d2;
            } else if (op.equals("×") || op.equals("÷")) {
                calculation = 0;
            } else if (op.equals("%")) {
                calculation = d2 / 100;
            }
            if (!s2.contains(".") && !op.equals("%")) {
                int c = (int) calculation;
                result.setText(c + "");
            } else {
                result.setText(calculation + "");
            }
        } else {
            result.setText("");
        }
    }
}

layout_land文件夹中 testland.xml

layout_port文件夹中 testland.xml

drawable 文件夹中border.xml

border1.xml

border2.xml