This article shares the specific code of Android Studio to implement simple calculator for your reference. The specific content is as follows
1. Problem description
Design and implement a number converter that can convert any input numerical value of the numerical type into a specified number type. There are four types of number system that must be implemented: binary, octal, decimal and hexadecimal.
2. Basic requirements
(1) Use the Spinner control to list four number types, namely: binary, octal, decimal and hexadecimal;
(2) The "Numerical" input box does not use the input panel provided by the Android system to perform numerical input; and can only be integer values;
Layout code:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:andro android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Balance converter" android:textSize="35sp" android:textColor="#9900AA"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Input data:" android:textSize="30sp" android:textColor="#99CCAA"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android: android:layout_width="125dp" android:layout_height="35dp" android:text="Binary type:" android:textSize="25sp" android:textColor="#000" /> <Spinner android: android:layout_width="240dp" android:layout_height="35dp" android:textSize="30sp" /> </LinearLayout> <EditText android: android:layout_width="match_parent" android:layout_height="wrap_content"></EditText> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Output data:" android:textSize="30sp" android:textColor="#99CCAA"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android: android:layout_width="125dp" android:layout_height="35dp" android:text="Binary type:" android:textSize="25sp" android:textColor="#000" /> <Spinner android: android:layout_width="240dp" android:layout_height="35dp" android:textSize="30sp" /> </LinearLayout> <EditText android: android:layout_width="match_parent" android:layout_height="wrap_content"></EditText> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="0" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="1" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="2" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="3" android:background="@drawable/btn_1" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="4" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="5" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="6" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="7" android:background="@drawable/btn_1" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="8" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="9" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="A" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="B" android:background="@drawable/btn_1" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="C" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="D" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="E" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="F" android:background="@drawable/btn_1" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android: android:layout_width="70dp" android:layout_height="35dp" android:text="CE" android:background="@drawable/btn_1" /> <Button android: android:layout_width="70dp" android:layout_height="40dp" android:text="calculate" android:background="@drawable/btn_1" /> </LinearLayout> </LinearLayout>
Button press effect (btn_1.xml) code
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:andro> <item android:state_pressed="true"> <shape> <solid android:color="#CC7A00"/> <corners android:radius="10dp"/> </shape> </item> <item android:state_pressed="false"> <shape> <solid android:color="#FF9900"/> <corners android:radius="10dp"/> </shape> </item> </selector>
MainActivity
package ;
import ;
import ;
import ;
import ;
import ;
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import ;
import ;
public class MainActivity extends AppCompatActivity {
Spinner spinner1,spinner2;
EditText et_shuru,et_shuchu;
Button btn_CE,btn_js;
int ids[]={.btn_0,.btn_1,.btn_2,.btn_3,.btn_4,.btn_5, .btn_6,.btn_7,
.btn_8,.btn_9,.btn_A,.btn_B,.btn_C,.btn_D,.btn_E,.btn_F};
String temp=null,num1=null,num2=null,num3=null,num4=null;int k;
@Override
protected void onCreate(Bundle savedInstanceState) {
(savedInstanceState);
setContentView(.activity_main);
btn_CE=findViewById(.btn_CE);
btn_js=findViewById( .btn_js);
btn_CE.setOnClickListener(new () {
@Override
public void onClick(View v) {
et_shuru.setText("");
et_shuchu.setText("");
}
});
for(int i=0;i<;i++){
Button btn = findViewById(ids[i]);
if(btn != null)
(new () {
@Override
public void onClick(View v) {
switch (()){
case .btn_0:
et_shuru.setText(et_shuru.getText()+"0");
break;
case .btn_1:
et_shuru.setText(et_shuru.getText()+"1");
break;
case .btn_2:
et_shuru.setText(et_shuru.getText()+"2");
break;
case .btn_3:
et_shuru.setText(et_shuru.getText()+"3");
break;
case .btn_4:
et_shuru.setText(et_shuru.getText()+"4");
break;
case .btn_5:
et_shuru.setText(et_shuru.getText()+"5");
break;
case .btn_6:
et_shuru.setText(et_shuru.getText()+"6");
break;
case .btn_7:
et_shuru.setText(et_shuru.getText()+"7");
break;
case .btn_8:
et_shuru.setText(et_shuru.getText()+"8");
break;
case .btn_9:
et_shuru.setText(et_shuru.getText()+"9");
break;
case .btn_A:
et_shuru.setText(et_shuru.getText()+"A");
break;
case .btn_B:
et_shuru.setText(et_shuru.getText()+"B");
break;
case .btn_C:
et_shuru.setText(et_shuru.getText()+"C");
break;
case .btn_D:
et_shuru.setText(et_shuru.getText()+"D");
break;
case .btn_E:
et_shuru.setText(et_shuru.getText()+"E");
break;
case .btn_F:
et_shuru.setText(et_shuru.getText()+"F");
break;
}
}
});
}
et_shuru=findViewById(.et_shuru);
et_shuchu=findViewById(.et_shuchu);
spinner1=(Spinner)findViewById(.spinner1);
spinner2=(Spinner)findViewById(.spinner2);
//Create a data source String[] mltems = getResources().getStringArray();
ArrayAdapter<String>adapter= new ArrayAdapter<String>(this,.simple_spinner_item,mltems);
(.simple_spinner_dropdown_item);
//Bind Adapter to the control (adapter);
(new () {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
switch (pos){
case 0: k=2;setEnabled(2);break;
case 1: k=8;setEnabled(8);break;
case 2: k=10;setEnabled(10);break;
case 3: k=16;setEnabled(16);break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
(adapter);
(new () {
@Override
public void onItemSelected(AdapterView<?> parent, View view, final int pos, long id) {
switch (pos){
case 0: btn_js.setOnClickListener(new () {
@Override
public void onClick(View v) {
temp = et_shuru.getText().toString();
num3 = (temp, k).toString();//Convert to decimal; num1 = ((num3));
et_shuchu.setText(num1);
}
});break;
case 1: btn_js.setOnClickListener(new () {
@Override
public void onClick(View v) {
temp = et_shuru.getText().toString();
num3 = (temp, k).toString();//Convert to decimal; num2 = ((num3));
et_shuchu.setText(num2);
}
});break;
case 2: btn_js.setOnClickListener(new () {
@Override
public void onClick(View v) {
temp = et_shuru.getText().toString();
num3 = (temp, k).toString();//Convert to decimal; et_shuchu.setText(num3);
}
});break;
case 3: btn_js.setOnClickListener(new () {
@Override
public void onClick(View v) {
temp = et_shuru.getText().toString();
num3 = (temp, k).toString();//Convert to decimal; num4 = ((num3));
et_shuchu.setText(num4);
}
});break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
public void setEnabled(int count){
int i =0,size = (count,);
for( i=0;i<size;i++){
Button btn = findViewById(ids[i]);
if(btn != null){
(true);
}
}
for( i=size;i<;i++){
Button btn = findViewById(ids[i]);
if(btn != null){
(false);
}
}
}
}Data source for Spinner control ()
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="data"> <item>Binary</item> <item>Octal</item> <item>Decimal</item> <item>hexadecimal</item> </string-array> </resources>
The above is all the content of this article. I hope it will be helpful to everyone's study and I hope everyone will support me more.