一般是什么问题导致不能小数运算
字符串的类型我转换为double了
skyking524
2016-09-11
3 回答
public class MainActivity extends ActionBarActivity implements OnClickListener {
private Button btc;
private Button btd;
private Button btv;
private Button btm;
private Button bt9;
private Button bt8;
private Button bt7;
private Button bt6;
private Button bt5;
private Button bt4;
private Button bt3;
private Button bt2;
private Button bt1;
private Button bt0;
private Button btp;
private Button btj;
private Button bti;
private Button bta;
private EditText edt;
boolean flag ;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btc = (Button) findViewById(R.id.clear);
btd =(Button) findViewById(R.id.Delate);
btv =(Button) findViewById(R.id.chu);
btm = (Button) findViewById(R.id.mut);
bt9 = (Button) findViewById(R.id.btn_9);
bt8 = (Button) findViewById(R.id.btn_8);
bt7 =(Button) findViewById(R.id.btn_7);
bt6 = (Button) findViewById(R.id.btn_6);
bt5 = (Button) findViewById(R.id.btn_5);
bt4 =(Button) findViewById(R.id.btn_4);
bt3 = (Button) findViewById(R.id.btn_3);
bt2 =(Button) findViewById(R.id.btn_2);
bt1 =(Button) findViewById(R.id.btn_1);
bt0 =(Button) findViewById(R.id.btn_0);
btp =(Button) findViewById(R.id.btn_point);
btj =(Button) findViewById(R.id.jian);
bti =(Button) findViewById(R.id.output);
bta =(Button) findViewById(R.id.add);
edt =(EditText) findViewById(R.id.input);
btc.setOnClickListener(this);
btd.setOnClickListener(this);
btv.setOnClickListener(this);
btm.setOnClickListener(this);
bt9.setOnClickListener(this);
bt8.setOnClickListener(this);
bt7.setOnClickListener(this);
bt6.setOnClickListener(this);
bt5.setOnClickListener(this);
bt4.setOnClickListener(this);
bt3.setOnClickListener(this);
bt2.setOnClickListener(this);
bt1.setOnClickListener(this);
bt0.setOnClickListener(this);
btp.setOnClickListener(this);
btj.setOnClickListener(this);
bti.setOnClickListener(this);
bta.setOnClickListener(this);
edt.setOnClickListener(this);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
@Override
public 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;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String str = edt.getText().toString();
switch (v.getId()) {
case R.id.btn_0:
case R.id.btn_1:
case R.id.btn_2:
case R.id.btn_3:
case R.id.btn_4:
case R.id.btn_5:
case R.id.btn_6:
case R.id.btn_7:
case R.id.btn_8:
case R.id.btn_9:
case R.id.btn_point:
if(flag){
flag=false;
edt.setText("");
}
edt.setText(str+((Button)v).getText());
break;
case R.id.chu:
case R.id.jian:
case R.id.mut:
case R.id.add:
if(flag){
flag=false;
edt.setText("");
}
edt.setText(str+" "+((Button)v).getText()+" ");
break;
case R.id.clear:
flag=false;
edt.setText("");
break;
case R.id.Delate:
if (str!=null&&str.equals("")) {
edt.setText(str.substring(0, str.length()-1));
}
break;
case R.id.output:
getrt();
break;
default:
break;
}
}
private void getrt(){
String exp = edt.getText().toString();
if(exp ==null||exp.equals("")){
return;
}
if(!exp.contains("")){
return;
}
flag = true;
double r3 =0;
String r1=exp.substring(0, exp.indexOf(" "));
String op=exp.substring(exp.indexOf(" ")+1, exp.indexOf(" ")+2);
String r2=exp.substring(exp.indexOf(" ")+2);
if(!r1.equals("")&&!r2.equals("")){
double e1 = Double.parseDouble(r1);
double e2 = Double.parseDouble(r2);
if(op.equals("+")){
r3 = e1 + e2;
}else
if(op.equals("-")){
r3 =e1-e2;
}else
if(op.equals("/")){
r3 = e1/e2;
}
else if(op.equals("X")){
if(e2==0){
r3 =0;
}else{
r3 = e1*e2;
}
}
if(!r1.contains(".")&&!r2.contains(".")){
int r =(int) r3;
edt.setText(r+"");
}
}
}
}
举报
0/150
提交
取消
