自己做的简单计算器。
老规矩。右键取得图片地址，利用下载工具下载这个显示不出来的图片。后缀改为rar即可得到源代码项目。
就一个activity
package zhang.calculator; import android.app.Activity; import android.app.AlertDialog; import android.os.Bundle; import android.os.Vibrator; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class MyCalculator extends Activity { private Vibrator vibrator; private Double num_a; private Double num_b; private TextView text = null; private String temp = null;// 计算符号 private boolean isDot = true;// 小数点控制 private boolean clickable = true;// 标志是否按过计算按钮 private double memoryd; // 使用内存中存储的数字 private int memoryi; private TextView lable=null; private boolean isVib=true; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.calculator_main); final Button num1 = (Button) findViewById(R.id.num1); final Button num2 = (Button) findViewById(R.id.num2); final Button num3 = (Button) findViewById(R.id.num3); final Button num4 = (Button) findViewById(R.id.num4); final Button num5 = (Button) findViewById(R.id.num5); final Button num6 = (Button) findViewById(R.id.num6); final Button num7 = (Button) findViewById(R.id.num7); final Button num8 = (Button) findViewById(R.id.num8); final Button num9 = (Button) findViewById(R.id.num9); Button num0 = (Button) findViewById(R.id.zero); Button point=(Button) findViewById(R.id.point); Button mul=(Button)findViewById(R.id.mul); Button sub=(Button)findViewById(R.id.sub); Button add=(Button)findViewById(R.id.add); Button div=(Button)findViewById(R.id.div); Button sqrt=(Button)findViewById(R.id.sqrt); Button equal=(Button) findViewById(R.id.equal); Button c=(Button) findViewById(R.id.clear); Button cm=(Button)findViewById(R.id.clearm); Button m=(Button)findViewById(R.id.memory); Button tf=(Button)findViewById(R.id.tf); Button mshow=(Button)findViewById(R.id.showmemory); Button back=(Button)findViewById(R.id.back); text = (TextView) findViewById(R.id.showText); lable = (TextView) findViewById(R.id.lable); vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE); //0 num0.setOnClickListener(new Button.OnClickListener() { public void onClick(View v) { zd(); if(text.getText().toString().equalsIgnoreCase("0")){ }else{ if (clickable == false) { text.setText(""); text.setText(text.getText().toString()+"0"); clickable = true; } else { text.setText(text.getText().toString()+"0"); } } } }); //1 num1.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num1.getText().toString()); } }); // 2 num2.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num2.getText().toString()); } }); // 3 num3.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num3.getText().toString()); } }); // 4 num4.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num4.getText().toString()); } }); // 5 num5.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num5.getText().toString()); } }); // 6 num6.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num6.getText().toString()); } }); // 7 num7.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num7.getText().toString()); } }); // 8 num8.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num8.getText().toString()); } }); // 9 num9.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { show(num9.getText().toString()); } }); //. point.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); if(text.getText().toString().equalsIgnoreCase("")){ }else{ if (text.getText().toString()!=""&&isDot == true) { text.setText(text.getText()+"."); isDot = false; }else{ text.setText(text.getText().toString()); } } } }); //加 add.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { zd(); if(text.getText().toString().equalsIgnoreCase("")){ }else{ if (text.getText() != null){ num_a =Double.parseDouble(text.getText().toString()); temp = "add"; clickable = false; isDot=true; lable.setText("＋"); } } } }); //减 sub.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { zd(); if(text.getText().toString().equalsIgnoreCase("")){ }else{ if (text.getText() != null){ num_a =Double.parseDouble(text.getText().toString()); temp = "sub"; clickable = false; lable.setText("—"); }else{ text.setText("—"); } isDot=true; } } }); //乘 mul.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { zd(); if(text.getText().toString().equalsIgnoreCase("")){ }else{ if (text.getText() != null){ num_a =Double.parseDouble(text.getText().toString()); temp = "mul"; lable.setText("×"); clickable = false; isDot=true; } } } }); // 除 div.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { zd(); if(text.getText().toString().equalsIgnoreCase("")){ }else{ if (text.getText() != null){ num_a =Double.parseDouble(text.getText().toString()); temp = "div"; lable.setText("÷"); clickable = false; isDot=true; } } } }); //开方 sqrt.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); if(text.getText().toString().equalsIgnoreCase("")){ }else{ String s = text.getText().toString(); if (s.charAt(0) == '-') { Toast.makeText(MyCalculator.this, "负数不能开根号！！",Toast.LENGTH_SHORT).show(); clickable = false; } else { text.setText(Double.toString(java.lang.Math.sqrt(Double.parseDouble(text.getText().toString())))); lable.setText("√"); clickable = false; } } } }); //等于 equal.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { zd(); if (temp != null && text.getText() != null){ num_b = (Double.parseDouble(text.getText().toString())); if (temp == "add"){ text.setText(Float.toString((float) (num_a + num_b))); temp = null; }else if (temp == "sub"){ text.setText(Float.toString((float) (num_a - num_b))); temp = null; }else if (temp == "mul"){ text.setText(Float.toString((float) (num_a * num_b))); temp = null; }else if (temp == "div"){ text.setText(Float.toString((float) (num_a / num_b))); temp = null; } clickable = false; if(text.getText().toString()==""){ isDot =true; }else{ isDot =false; } } } }); //c c.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); text.setText(""); lable.setText(""); num_a = 0.0; temp = null; clickable = false; isDot = true; } }); //cm cm.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); memoryd = memoryi = 0; } }); //m m.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); if (text.getText().toString() != " "){ boolean isDot = false; for (int i = 0; i < text.getText().length(); i++){ if ('.' == text.getText().charAt(i)) { isDot = true; break; } } if(text.getText().toString().equalsIgnoreCase("")){ memoryd = memoryi = 0; } else{ if (isDot == true) { memoryd = Double.parseDouble(text.getText().toString()); memoryi = 0; } else { memoryi = Integer.parseInt(text.getText().toString()); memoryd = 0; } } clickable = false; } } }); //ms mshow.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); if (memoryd != 0) { text.setText(Double.toString(memoryd)); } if (memoryi != 0) { text.setText(Integer.toString(memoryi)); } clickable = false; } }); //取反 tf.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); if(text.getText().toString().equalsIgnoreCase("")){ }else{ boolean isNumber = true; String s = text.getText().toString(); for (int i = 0; i < s.length(); i++) if (!(s.charAt(i) >= '0' && s.charAt(i) <= '9' || s.charAt(i) == '.' || s.charAt(i) == '-')) { isNumber = false; break; } if (isNumber == true) { //如果当前字符串首字母有'-'号,代表现在是个负数,再按下时,则将首符号去掉 if (s.charAt(0) == '-') { text.setText(""); for (int i = 1; i < s.length(); i++) { char a = s.charAt(i); text.setText(text.getText().toString() + a); } } //如果当前字符串第一个字符不是符号，则添加一个符号在首字母处 else text.setText('-' + s); } }} }); //back back.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { zd(); if(clickable == true) if (text.getText().toString() != "") { String s = text.getText().toString(); text.setText(""); for (int i = 0; i < s.length() - 1; i++) { char a = s.charAt(i); text.setText(text.getText().toString() + a); } } } }); } public void zd(){ //振动的方法 if(isVib==true){ long[] pattern = {0, 20, 0, 10}; // OFF/ON/OFF/ON... vibrator.vibrate(pattern, -1); }else{ vibrator.cancel(); } } public void show(String i){ //1-9的数 zd(); if (clickable == false) { text.setText(""); text.setText(text.getText() + i); clickable = true; } else { text.setText(text.getText() + i); } } public boolean onCreateOptionsMenu(Menu menu) { //添加菜单 // TODO Auto-generated method stub menu.add(0, 1, 1,R.string.exit); menu.add(0, 2, 2, R.string.about); menu.add(1,3,3,"开/关震动"); return super.onCreateOptionsMenu(menu); } public boolean onOptionsItemSelected(MenuItem item) { //设置菜单事件 switch(item.getItemId()){ case 1: finish(); break; case 2: AlertDialog.Builder dialog = new AlertDialog.Builder(this); dialog.setTitle("关于").setMessage("This is a black cool convenient calculator!\nBy：没落凄凉").show(); break; case 3: if(isVib){ isVib=false; }else{ isVib=true; } } return super.onOptionsItemSelected(item); } } 布局 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_height="fill_parent" android:layout_width="fill_parent"> <TextView android:id="@+id/lable" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="right" android:singleLine="true" android:scrollHorizontally="true" android:background="@color/black" android:textColor="@color/write" android:layout_margin="5dip" android:layout_marginBottom="5dip" /> <TextView android:id="@+id/showText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="right" android:textSize="33dip" android:singleLine="true" android:scrollHorizontally="true" android:background="@color/black" android:textColor="@color/write" android:bufferType="editable" android:layout_marginLeft="5dip" android:maxLength="17" android:layout_marginRight="5dip" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:gravity="center" android:layout_marginTop="5dip" android:paddingTop="5dip"> <Button android:text="C" android:id="@+id/clear" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:gravity="center" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="CM" android:id="@+id/clearm" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="M" android:id="@+id/memory" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="MS" android:id="@+id/showmemory" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write" ></Button> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:gravity="center"> <Button android:text="＋" android:id="@+id/add" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="－" android:id="@+id/sub" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="×" android:id="@+id/mul" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="÷" android:id="@+id/div" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:gravity="center"> <Button android:text="1" android:id="@+id/num1" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="2" android:id="@+id/num2" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="3" android:id="@+id/num3" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="√" android:id="@+id/sqrt" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:gravity="center"> <Button android:text="4" android:id="@+id/num4" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="5" android:id="@+id/num5" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="6" android:id="@+id/num6" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="←" android:id="@+id/back" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> </LinearLayout> <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:orientation="vertical" > <Button android:text="7" android:id="@+id/num7" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="0" android:id="@+id/zero" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:orientation="vertical" > <Button android:text="8" android:id="@+id/num8" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="+/-" android:id="@+id/tf" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:orientation="vertical" > <Button android:text="9" android:id="@+id/num9" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"></Button> <Button android:text="." android:id="@+id/point" android:layout_width="75dip" android:layout_height="60dip" android:textSize="45dip" android:textStyle="bold" android:gravity="center" android:background="@color/black" android:textColor="@color/write"></Button> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/linearLayout1" android:orientation="vertical" > <Button android:text="=" android:id="@+id/equal" android:layout_width="75dip" android:layout_height="120dip" android:textSize="50dip" android:textStyle="bold" android:background="@color/black" android:textColor="@color/write"/> </LinearLayout> </LinearLayout> </LinearLayout>