安卓计算器

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转载请标明出处：http://blog.csdn.net/wu_wxc/article/details/46935267
本文出自【吴孝城的CSDN博客】

写个简单的安卓计算器

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <EditText        android:id="@+id/result"        android:cursorVisible="false"        android:editable = "false"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="2"/>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="16px"        android:layout_marginRight="16px"        android:orientation="horizontal">        <Button            android:id="@+id/C"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/C"            android:textColor="#ffff6970"            android:layout_weight="1"/>        <Button            android:id="@+id/addition"            android:text="@string/addition"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"/>        <Button            android:id="@+id/Multiplication"            android:text="@string/Multiplication"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"/>        <Button            android:id="@+id/del"            android:text="@string/del"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"/>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="16px"        android:layout_marginRight="16px">        <Button            android:id="@+id/seven"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/seven"            android:layout_weight="1"/>        <Button            android:id="@+id/eight"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/eight"            android:layout_weight="1"/>        <Button            android:id="@+id/nine"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/nine"            android:layout_weight="1"/>        <Button            android:id="@+id/add"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/add"            android:layout_weight="1"/>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="16px"        android:layout_marginRight="16px">        <Button            android:id="@+id/four"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/four"            android:layout_weight="1"/>        <Button            android:id="@+id/five"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/five"            android:layout_weight="1"/>        <Button            android:id="@+id/six"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/six"            android:layout_weight="1"/>        <Button            android:id="@+id/Reduction"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:text="@string/Reduction"            android:layout_weight="1"/>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:layout_marginLeft="16px"        android:layout_marginRight="16px">        <LinearLayout            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="3"            android:orientation="vertical"            >            <LinearLayout                android:layout_width="match_parent"                android:layout_height="wrap_content">                <Button                    android:id="@+id/one"                    android:layout_width="0dp"                    android:layout_weight="1"                    android:layout_height="wrap_content"                    android:text="@string/one"/>                <Button                    android:id="@+id/two"                    android:layout_width="0dp"                    android:layout_weight="1"                    android:layout_height="wrap_content"                    android:text="@string/two"/>                <Button                    android:id="@+id/three"                    android:layout_width="0dp"                    android:layout_weight="1"                    android:layout_height="wrap_content"                    android:text="@string/three"/>            </LinearLayout>            <LinearLayout                android:layout_width="match_parent"                android:layout_height="wrap_content">                <Button                    android:id="@+id/zero"                    android:layout_width="0dp"                    android:layout_height="wrap_content"                    android:text="@string/zero"                    android:layout_weight="2"/>                <Button                    android:id="@+id/point"                    android:layout_width="0dp"                    android:layout_height="wrap_content"                    android:layout_weight="1"                    android:text="@string/point"/>            </LinearLayout>        </LinearLayout>        <LinearLayout            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1">            <Button                android:id="@+id/equal"                android:text="@string/equal"                android:textColor="#ffff6970"                android:layout_width="match_parent"                android:layout_height="match_parent"/>        </LinearLayout>    </LinearLayout></LinearLayout>

strings.xml

<resources>    <string name="app_name">Calculator</string>    <string name="hello_world">Hello world!</string>    <string name="action_settings">Settings</string>    <string name="C">C</string>    <string name="addition">/</string>    <string name="Multiplication">x</string>    <string name="del">del</string>    <string name="seven">7</string>    <string name="eight">8</string>    <string name="nine">9</string>    <string name="add">+</string>    <string name="six">6</string>    <string name="five">5</string>    <string name="four">4</string>    <string name="Reduction">-</string>    <string name="three">3</string>    <string name="two">2</string>    <string name="one">1</string>    <string name="equal">=</string>    <string name="zero">0</string>    <string name="point">.</string></resources>

MainActivity.java

package wuxiaocheng.cn.calculator;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.Window;import android.widget.Button;import android.widget.TextView;import android.view.View.OnClickListener;public class MainActivity extends Activity implements OnClickListener {    //定义两个参数，接受result前后的值    double num1 = 0, num2 = 0;    //计算结果    double Result = 0;    //判断是否按了“=”按钮    boolean isClickEqu = false;    //判断操作数    int op = 0;    TextView result = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main);        //从布局中查找按钮        Button C = (Button) this.findViewById(R.id.C);        Button addition = (Button)this.findViewById(R.id.addition);        Button Multiplication = (Button)this.findViewById(R.id.Multiplication);        Button del = (Button) this.findViewById(R.id.del);        Button seven = (Button) this.findViewById(R.id.seven);        Button eight = (Button) this.findViewById(R.id.eight);        Button nine = (Button) this.findViewById(R.id.nine);        Button add = (Button) this.findViewById(R.id.add);        Button four = (Button) this.findViewById(R.id.four);        Button five = (Button) this.findViewById(R.id.five);        Button six = (Button) this.findViewById(R.id.six);        Button Reduction = (Button) this.findViewById(R.id.Reduction);        Button one = (Button) this.findViewById(R.id.one);        Button two = (Button) this.findViewById(R.id.two);        Button three = (Button) this.findViewById(R.id.three);        Button zero = (Button) this.findViewById(R.id.zero);        Button point = (Button) this.findViewById(R.id.point);        Button equal = (Button) this.findViewById(R.id.equal);        result = (TextView) this.findViewById(R.id.result);        //让activity实现点击事件的接口        C.setOnClickListener(this);        addition.setOnClickListener(this);        Multiplication.setOnClickListener(this);        del.setOnClickListener(this);        seven.setOnClickListener(this);        eight.setOnClickListener(this);        nine.setOnClickListener(this);        add.setOnClickListener(this);        four.setOnClickListener(this);        five.setOnClickListener(this);        six.setOnClickListener(this);        Reduction.setOnClickListener(this);        one.setOnClickListener(this);        two.setOnClickListener(this);        three.setOnClickListener(this);        zero.setOnClickListener(this);        point.setOnClickListener(this);        equal.setOnClickListener(this);    }    //接口里面未实现的方法    public void onClick(View v){        switch (v.getId()){            //清零键            case R.id.C:                result.setText(null);                break;            //删除键            case R.id.del:                String myStr = result.getText().toString();            {                try {                    result.setText(myStr.substring(0,myStr.length()-1));                }catch (Exception e){                    result.setText("");                }            }            break;            //按钮0-9            case R.id.zero:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString0=result.getText().toString();                myString0+="0";                result.setText(myString0);                break;            case R.id.one:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString1=result.getText().toString();                myString1+="1";                result.setText(myString1);                break;            case R.id.two:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString2=result.getText().toString();                myString2+="2";                result.setText(myString2);                break;            case R.id.three:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString3=result.getText().toString();                myString3+="3";                result.setText(myString3);                break;            case R.id.four:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString4=result.getText().toString();                myString4+="4";                result.setText(myString4);                break;            case R.id.five:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString5=result.getText().toString();                myString5+="5";                result.setText(myString5);                break;            case R.id.six:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString6=result.getText().toString();                myString6+="6";                result.setText(myString6);                break;            case R.id.seven:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString7=result.getText().toString();                myString7+="7";                result.setText(myString7);                break;            case R.id.eight:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString8=result.getText().toString();                myString8+="8";                result.setText(myString8);                break;            case R.id.nine:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myString9=result.getText().toString();                myString9+="9";                result.setText(myString9);                break;            //点            case R.id.point:                if(isClickEqu)                {                    result.setText(null);                    isClickEqu=false;                }                String myStringp=result.getText().toString();                myStringp+=".";                result.setText(myStringp);                break;            //加            case R.id.add:                String mystringadd = result.getText().toString();                if(mystringadd.equals(null))                {                    return;                }                num1 = Double.valueOf(mystringadd);                result.setText(null);                op = 1;                isClickEqu = false;                break;            //减            case R.id.Reduction:                String mystringred = result.getText().toString();                if(mystringred.equals(null))                {                    return;                }                num1 = Double.valueOf(mystringred);                result.setText(null);                op = 2;                isClickEqu = false;                break;            //乘            case R.id.Multiplication:                String mystringmul = result.getText().toString();                if(mystringmul.equals(null))                {                    return;                }                num1 = Double.valueOf(mystringmul);                result.setText(null);                op = 3;                isClickEqu = false;                break;            //除            case R.id.addition:                String mystringat = result.getText().toString();                if(mystringat.equals(null))                {                    return;                }                num1 = Double.valueOf(mystringat);                result.setText(null);                op = 4;                isClickEqu = false;                break;            //等于            case R.id.equal:                String myStringeq=result.getText().toString();                if (myStringeq.equals(null)){                    return;                }                num2 = Double.valueOf(myStringeq);                result.setText(null);                switch (op){                    case 0:                        Result = num2;                        break;                    case 1:                        Result = num1 + num2;                        break;                    case 2:                        Result = num1 - num2;                        break;                    case 3:                        Result = num1 * num2;                        break;                    case 4:                        Result = num1 / num2;                        break;                }                result.setText(String.valueOf(Result));                isClickEqu = true;                break;        }    }}

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