一个简单的计算器
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<LinearLayout 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:background="#000" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <EditText android:id="@+id/led" android:layout_width="288dp" android:layout_height="79dp" android:background="#000" android:gravity="top|right" android:text="0" android:maxLength="9" android:textColor="#FFF" android:textSize="20pt" android:textStyle="bold" /> <LinearLayout android:layout_width="288dp" android:layout_height="70dp" android:orientation="horizontal" > <Button android:id="@+id/clear" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="AC" /> <Button android:id="@+id/swt" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="+/-" /> <Button android:id="@+id/per" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="%" /> <Button android:id="@+id/div" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#f99011" android:text="÷" /> </LinearLayout> <LinearLayout android:layout_width="288dp" android:layout_height="70dp" android:orientation="horizontal" > <Button android:id="@+id/btn7" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="7" /> <Button android:id="@+id/btn8" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="8" /> <Button android:id="@+id/btn9" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="9" /> <Button android:id="@+id/mul" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#f99011" android:text="×" /> </LinearLayout> <LinearLayout android:layout_width="288dp" android:layout_height="70dp" android:layout_marginTop="0.5dp" android:orientation="horizontal" > <Button android:id="@+id/btn4" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="4" /> <Button android:id="@+id/btn5" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="5" /> <Button android:id="@+id/btn6" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="6" /> <Button android:id="@+id/sub" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#f99011" android:text="-" /> </LinearLayout> <LinearLayout android:layout_width="288dp" android:layout_height="70dp" android:layout_marginTop="0.5dp" android:orientation="horizontal" > <Button android:id="@+id/btn1" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="1" /> <Button android:id="@+id/btn2" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="2" /> <Button android:id="@+id/btn3" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#C3C4C5" android:text="3" /> <Button android:id="@+id/add" android:layout_width="70dp" android:layout_height="70dp" android:layout_margin="0.5dp" android:layout_weight="1" android:background="#f99011" android:text="+" /> </LinearLayout> <LinearLayout android:layout_width="288dp" android:layout_height="70dp" android:layout_marginTop="0.5dp" android:orientation="horizontal" > <Button android:id="@+id/btn0" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="2" android:layout_margin="0.5dp" android:background="#C3C4C5" android:text="0" /> <Button android:id="@+id/point" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:layout_margin="0.5dp" android:background="#C3C4C5" android:text="." /> <Button android:id="@+id/equal" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:layout_margin="0.5dp" android:background="#f99011" android:text="=" /> </LinearLayout> </LinearLayout>
package example.ioscalculator;import javax.security.auth.PrivateCredentialPermission;import android.os.Bundle;import android.R.integer;import android.app.Activity;import android.bluetooth.BluetoothAdapter.LeScanCallback;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {//数字键private Button b0;private Button b1;private Button b2;private Button b3;private Button b4;private Button b5;private Button b6;private Button b7;private Button b8;private Button b9;//功能键private Button pt;private Button add;private Button sub;private Button mul;private Button div;private Button clear;private Button per;private Button swt;private Button equal;//显示private EditText led;String num1 = "";String num2 = "";double num3 = 0;String result = "";String sign = ""; int mark = 0; boolean flag =true; boolean dotmark = true;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);b0 = (Button) findViewById(R.id.btn0);b1 = (Button) findViewById(R.id.btn1);b2 = (Button) findViewById(R.id.btn2);b3 = (Button) findViewById(R.id.btn3);b4 = (Button) findViewById(R.id.btn4);b5 = (Button) findViewById(R.id.btn5);b6 = (Button) findViewById(R.id.btn6);b7 = (Button) findViewById(R.id.btn7);b8 = (Button) findViewById(R.id.btn8);b9 = (Button) findViewById(R.id.btn9);pt = (Button) findViewById(R.id.point);add = (Button) findViewById(R.id.add);sub = (Button) findViewById(R.id.sub);mul = (Button) findViewById(R.id.mul);div = (Button) findViewById(R.id.div);per = (Button) findViewById(R.id.per);equal = (Button) findViewById(R.id.equal);swt = (Button)findViewById(R.id.swt);led = (EditText) findViewById(R.id.led);clear = (Button) findViewById(R.id.clear);//设置监听b0.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "0";led.setText(num1);}else if(mark == 1){num2 = num2 + "0";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "0";led.setText(num1 + sign + num2);}}});b1.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "1";led.setText(num1);}else if(mark == 1){num2 = num2 + "1";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "1";led.setText(num1 + sign + num2);}}});b2.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "2";led.setText(num1);}else if(mark == 1){num2 = num2 + "2";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "2";led.setText(num1 + sign + num2);}}});b3.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "3";led.setText(num1);}else if(mark == 1){num2 = num2 + "3";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "32";led.setText(num1 + sign + num2);}}});b4.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "4";led.setText(num1);}else if(mark == 1){num2 = num2 + "4";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "4";led.setText(num1 + sign + num2);}}});b5.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "5";led.setText(num1);}else if(mark == 1){num2 = num2 + "5";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "5";led.setText(num1 + sign + num2);}}});b6.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "6";led.setText(num1);}else if(mark == 1){num2 = num2 + "6";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "6";led.setText(num1 + sign + num2);}}});b7.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "7";led.setText(num1);}else if(mark == 1){num2 = num2 + "7";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "7";led.setText(num1 + sign + num2);}}});b8.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "8";led.setText(num1);}else if(mark == 1){num2 = num2 + "8";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "8";led.setText(num1 + sign + num2);}}});b9.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(mark==0){num1 = num1 + "9";led.setText(num1);}else if(mark == 1){num2 = num2 + "9";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + "9";led.setText(num1 + sign + num2);}}});add.setOnClickListener(new OnClickListener(){public void onClick(View v){if(flag){sign = "+";mark++;flag = false;dotmark = true;}}});sub.setOnClickListener(new OnClickListener(){public void onClick(View v){if(flag){sign = "-";mark++;flag = false;dotmark = true;}}});mul.setOnClickListener(new OnClickListener(){public void onClick(View v){if(flag){sign = "*";mark++;flag = false;dotmark = true;}}});div.setOnClickListener(new OnClickListener(){public void onClick(View v){if(flag){sign = "/";mark++;flag = false;dotmark = true;}}});swt.setOnClickListener(new OnClickListener() {public void onClick(View v) {if(flag){if(num1 == ""){led.setText("-" + "0");}else if(Double.parseDouble(num1)>0){num1 = String.valueOf(0 - Double.parseDouble(num1));led.setText(num1);}else if(Double.parseDouble(num1)<0){num1 = String.valueOf(0 - Double.parseDouble(num1));led.setText(num1);}}}});per.setOnClickListener(new OnClickListener(){public void onClick(View v){if(flag){sign = "%";mark++;flag = false;dotmark = true;}}});pt.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("C");if(dotmark){if(mark==0){num1 = 0 + ".";led.setText(num1);}else if(mark == 1){num2 = num2 + ".";led.setText(num1 + sign + num2);}else{num1 = String.valueOf(num3);num2 = num2 + ".";led.setText(num1 + sign + num2);}}}});equal.setOnClickListener(new OnClickListener(){public void onClick(View v){flag = true;dotmark = true;if(sign.equals("+")){double x = Double.parseDouble(num1);double y = Double.parseDouble(num2);num3 = x+y;result = String.valueOf(num3);led.setText(result);num2 = "";num1 = result;sign = "";}else if(sign.equals("-")){double x = Double.parseDouble(num1);double y = Double.parseDouble(num2);num3 = x-y;result = String.valueOf(num3);led.setText(result);num2 = "";num1 = result;sign = "";}else if(sign.equals("*")){double x = Double.parseDouble(num1);double y = Double.parseDouble(num2);num3 = x*y;result = String.valueOf(num3);led.setText(result);num2 = "";num1 = result;sign = "";}else if(sign.equals("/")){double x = Double.parseDouble(num1);double y = Double.parseDouble(num2);num3 = x/y;result = String.valueOf(num3);led.setText(result);num2 = "";num1 = result;sign = "";}else if (sign.equals("%")) {double x = Double.parseDouble(num1);num3 = x/100;result = String.valueOf(num3);led.setText(result);num2 = "";num1 = result;sign = "";}}});clear.setOnClickListener(new OnClickListener(){public void onClick(View v){clear.setText("AC");num1 = "";num2 = "";num3 = 0;mark = 0;sign = "";led.setText("0");flag = true;dotmark = true;}});}@Overridepublic 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;}} 0 0
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