程序一按按键就报错，日志显示好像switch语句出现问题了
public class MainActivity extends Activity implements android.view.View.OnClickListener{
Button btn_0;
Button btn_1;
Button btn_2;
Button btn_3;
Button btn_4;
Button btn_5;
Button btn_6;
Button btn_7;
Button btn_8;
Button btn_9;
Button btn_point;
Button btn_clear;
Button btn_del;
Button btn_plus;
Button btn_minus;
Button btn_multiply;
Button btn_divide;
Button btn_equal;
EditText et_input;
boolean clear_flag;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_0=(Button) findViewById(R.id.btn_0);
btn_1=(Button) findViewById(R.id.btn_1);
btn_2=(Button) findViewById(R.id.btn_2);
btn_3=(Button) findViewById(R.id.btn_3);
btn_4=(Button) findViewById(R.id.btn_4);
btn_5=(Button) findViewById(R.id.btn_5);
btn_6=(Button) findViewById(R.id.btn_6);
btn_7=(Button) findViewById(R.id.btn_7);
btn_8=(Button) findViewById(R.id.btn_8);
btn_9=(Button) findViewById(R.id.btn_9);
btn_point=(Button) findViewById(R.id.btn_point);
btn_clear=(Button) findViewById(R.id.btn_clear);
btn_del=(Button) findViewById(R.id.btn_del);
btn_plus=(Button) findViewById(R.id.btn_plus);
btn_minus=(Button) findViewById(R.id.btn_minus);
btn_multiply=(Button) findViewById(R.id.btn_multiply);
btn_divide=(Button) findViewById(R.id.btn_divide);
btn_equal=(Button) findViewById(R.id.btn_equal);
et_input=(EditText) findViewById(R.id.et_input);
btn_0.setOnClickListener(this);
btn_2.setOnClickListener(this);
btn_3.setOnClickListener(this);
btn_4.setOnClickListener(this);
btn_5.setOnClickListener(this);
btn_6.setOnClickListener(this);
btn_7.setOnClickListener(this);
btn_8.setOnClickListener(this);
btn_9.setOnClickListener(this);
btn_1.setOnClickListener(this);
btn_point.setOnClickListener(this);
btn_clear.setOnClickListener(this);
btn_del.setOnClickListener(this);
btn_plus.setOnClickListener(this);
btn_minus.setOnClickListener(this);
btn_multiply.setOnClickListener(this);
btn_divide.setOnClickListener(this);
btn_equal.setOnClickListener(this);
}
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
}
@SuppressWarnings("null")
@Override
public void onClick(View arg0) {
View v = null;
@SuppressWarnings("unused")
String str =et_input.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:
str = "";
if(clear_flag){
clear_flag = false;
et_input.setText("");
}
et_input.setText(str+((Button)v).getText());
break;
case R.id.btn_plus:
case R.id.btn_minus:
case R.id.btn_multiply:
case R.id.btn_divide:
if(clear_flag){
clear_flag = false;
str = "";
et_input.setText("");
}
et_input.setText(str+" "+((Button)v).getText()+" ");
break;
case R.id.btn_clear:
clear_flag = false;
str = "";
et_input.setText("");
break;
case R.id.btn_del:
if(clear_flag){
clear_flag = false;
str = "";
et_input.setText("");
}else if(str!=null&&!str.equals("")){
et_input.setText(str.substring(0, str.length()-1));
}
break;
case R.id.btn_equal:
getResult();
break;
}
// TODO Auto-generated method stub
}
private void getResult(){
@SuppressWarnings("unused")
String exp = et_input.getText().toString();
if(exp==null||exp.equals("")){
return;
}
if(!exp.contains(" ")){
return;
}
if(clear_flag){
clear_flag = false;
return;
}
clear_flag = true;
@SuppressWarnings("unused")
double result = 0;
String s1 = exp.substring(0,exp.indexOf(" "));
String op = exp.substring(exp.indexOf(" ")+1,exp.indexOf(" ")+2);
String s2 = exp.substring(exp.indexOf(" ")+3);
if(!s1.equals("")&&!s2.equals("")){
double d1 = Double.parseDouble(s1);
double d2 = Double.parseDouble(s2);
if(op.equals("＋")){
result = d1+d2;
}else if(op.equals("－")){
result = d1-d2;
}else if(op.equals("×")){
result = d1*d2;
}else if(op.equals("÷")){
if(d2==0){
result = 0;
}else {
result = d1/d2;
}
}
if(!s1.contains(".")&&!s2.contains(".")){
int r = (int) result;
et_input.setText(r+"");
}else{
et_input.setText(result+"");
}
}else if (!s1.equals("")&&s2.equals("")&&!op.equals("÷")) {
et_input.setText(exp);
}else if (s1.equals("")&&s2.equals("")) {
double d2 = Double.parseDouble(s2);
if(op.equals("＋")){
result = 0+d2;
}else if(op.equals("－")){
result = 01-d2;
}else if(op.equals("×")){
result = 0;
}else if(op.equals("÷")){
result = 0;
}
}
if(!s2.contains(".")){
int r = (int) result;
et_input.setText(r+"");
}else{
et_input.setText(result+"");
}
if(s1.equals("")&&s2.equals("")){
et_input.setText("");
}
}
}
是arg0.getId()
