actibity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background_1"
android:orientation="vertical" >
<EditText
android:id="@+id/editText"
android:layout_width="fill_parent"
android:layout_marginTop="40dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_height="60dp"
android:editable="false"//设置为不可编辑
android:gravity="bottom|right"//光标设置到最右边
android:textSize="40sp"
android:text="@string/editText" />
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="150dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp">
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="@+id/button_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_clear" />
<Button
android:id="@+id/button_div"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_div"/>
<Button
android:id="@+id/button_mul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_mul"/>
<Button
android:id="@+id/button_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_delete"/>
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="@+id/button_7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_7"/>
<Button
android:id="@+id/button_8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_8"/>
<Button
android:id="@+id/button_9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_9"/>
<Button
android:id="@+id/button_sub"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_sub"/>
</TableRow>
<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="@+id/button_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_4"/>
<Button
android:id="@+id/button_5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_5"/>
<Button
android:id="@+id/button_6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_6"/>
<Button
android:id="@+id/button_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_add"/>
</TableRow>
<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="@+id/button_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_1"/>
<Button
android:id="@+id/button_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_2"/>
<Button
android:id="@+id/button_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_3"/>
<Button
android:id="@+id/button_paren"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_paren"/>
</TableRow>
<TableRow
android:id="@+id/tableRow5"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="@+id/button_0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_0"/>
<Button
android:id="@+id/button_point"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_point"/>
<Button
android:id="@+id/button_com"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_com"/>
<Button
android:id="@+id/button_equal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onClick"
android:text="@string/button_equal"/>
</TableRow>
</TableLayout>
</LinearLayout>
MainActivity.java
public class MainActivity extends Activity implements OnClickListener{
//声明变量
private EditText editText;
private Button button_0;
private Button button_1;
private Button button_2;
private Button button_3;
private Button button_4;
private Button button_5;
private Button button_6;
private Button button_7;
private Button button_8;
private Button button_9;
private Button button_clear;
private Button button_div;
private Button button_mul;
private Button button_delete;
private Button button_sub;
private Button button_add;
private Button button_paren;
private Button button_point;
private Button button_com;
private Button button_equal;
private List<Item> items=new ArrayList<Item>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获得对象引用
editText=(EditText)this.findViewById(R.id.editText);
button_0=(Button)this.findViewById(R.id.button_0);
button_1=(Button)this.findViewById(R.id.button_1);
button_2=(Button)this.findViewById(R.id.button_2);
button_3=(Button)this.findViewById(R.id.button_3);
button_4=(Button)this.findViewById(R.id.button_4);
button_5=(Button)this.findViewById(R.id.button_5);
button_6=(Button)this.findViewById(R.id.button_6);
button_7=(Button)this.findViewById(R.id.button_7);
button_8=(Button)this.findViewById(R.id.button_8);
button_9=(Button)this.findViewById(R.id.button_9);
button_clear=(Button)this.findViewById(R.id.button_clear);
button_div=(Button)this.findViewById(R.id.button_div);
button_mul=(Button)this.findViewById(R.id.button_mul);
button_delete=(Button)this.findViewById(R.id.button_delete);
button_sub=(Button)this.findViewById(R.id.button_sub);
button_add=(Button)this.findViewById(R.id.button_add);
button_paren=(Button)this.findViewById(R.id.button_paren);
button_point=(Button)this.findViewById(R.id.button_point);
button_com=(Button)this.findViewById(R.id.button_com);
button_equal=(Button)this.findViewById(R.id.button_equal);
//注册监听器，匿名内部类
editText.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_clear.setOnClickListener(this);
button_div.setOnClickListener(this);
button_mul.setOnClickListener(this);
button_delete.setOnClickListener(this);
button_sub.setOnClickListener(this);
button_add.setOnClickListener(this);
button_paren.setOnClickListener(this);
button_point.setOnClickListener(this);
button_com.setOnClickListener(this);
button_equal.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String string=editText.getText().toString();
switch(v.getId()){
case R.id.button_0:
editText.append("0");
break;
case R.id.button_1:
editText.append("1");
break;
case R.id.button_2:
editText.append("2");
break;
case R.id.button_3:
editText.append("3");
break;
case R.id.button_4:
editText.append("4");
break;
case R.id.button_5:
editText.append("5");
break;
case R.id.button_6:
editText.append("6");
break;
case R.id.button_7:
editText.append("7");
break;
case R.id.button_8:
editText.append("8");
break;
case R.id.button_9:
editText.append("9");
break;
case R.id.button_clear:
editText.setText("");
items.clear();
break;
case R.id.button_div:
items.add(new Item(Double.parseDouble(editText.getText().
toString()),Types.NUM));
checkAndComputer();
items.add(new Item(0,Types.DIV));
editText.setText("");
break;
case R.id.button_mul:
items.add(new Item(Double.parseDouble(editText.getText().
toString()),Types.NUM));
checkAndComputer();
items.add(new Item(0,Types.X));
editText.setText("");
break;
case R.id.button_delete:
break;
case R.id.button_sub:
items.add(new Item(Double.parseDouble(editText.getText().
toString()),Types.NUM));
checkAndComputer();
items.add(new Item(0,Types.SUB));
editText.setText("");
break;
case R.id.button_add:
items.add(new Item(Double.parseDouble(editText.getText().
toString()),Types.NUM));
checkAndComputer();
items.add(new Item(0,Types.ADD));
editText.setText("");
break;
case R.id.button_paren:
break;
case R.id.button_point:
break;
case R.id.button_com:
break;
case R.id.button_equal:
items.add(new Item(Double.parseDouble(editText.getText().
toString()),Types.NUM));
checkAndComputer();
editText.setText(items.get(0).value+"");
items.clear();
break;
}
}
public void checkAndComputer(){
if(items.size()>=3){
double a=items.get(0).value;
double b=items.get(2).value;
int opt=items.get(1).type;
items.clear();
switch(opt){
case Types.ADD:
items.add(new Item(a+b,Types.NUM));
break;
case Types.SUB:
items.add(new Item(a-b,Types.NUM));
break;
case Types.X:
items.add(new Item(a*b,Types.NUM));
break;
case Types.DIV:
items.add(new Item(a/b,Types.NUM));
break;
}
}
}
}
Item.java
public class Item {
public Item(double value,int type){
this.value=value;
this.type=type;
}
public double value=0;
public int type=0;
} Types.java
public class Types {
public static final int ADD=1;
public static final int SUB=2;
public static final int X=3;
public static final int DIV=4;
public static final int NUM=1;
}