Android-CheckBox 实现计算器

但使书种多，会有岁稔时。这篇文章主要讲述Android-CheckBox 实现计算器相关的知识，希望能为你提供帮助。
源码下载地址：http://download.csdn.net/detail/wu20093346/7718055
使用CheckBox的OnCheckedChangeListener做事件触发，效果图：

文章图片

list=new OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { // TODO Auto-generated method stub if(mBox1.isChecked()) { mBox1.setChecked(false); } if(mBox2.isChecked()) { mBox2.setChecked(false); } if(mBox3.isChecked()) { mBox3.setChecked(false); } if(mBox4.isChecked()) { mBox4.setChecked(false); } return false; } }; mEditText.setOnKeyListener(list); mEditText1.setOnKeyListener(list);

如代码所写。每当用户又一次输入数字后。就会激发文本框的onKey事件，让全部的CheckBox变成不选中状态。

listner=new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub switch (buttonView.getId()) { case R.id.Plus: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox1.setChecked(false); return; } break; case R.id.Cut: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox2.setChecked(false); return; } break; case R.id.Ride: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox3.setChecked(false); return; } break; case R.id.Except: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox4.setChecked(false); return; } break; default: break; } if(mBox1.isChecked()) { mTextView.setText( GetOperation(" +" )); } else { mTextView.setText(" " ); } if(mBox2.isChecked()) { mTextView2.setText(GetOperation(" -" )); } else { mTextView2.setText(" " ); } if(mBox3.isChecked()) { mTextView3.setText(GetOperation(" *" )); } else { mTextView3.setText(" " ); } if(mBox4.isChecked()) { mTextView4.setText(GetOperation(" /" )); } else { mTextView4.setText(" " ); } } }; mBox1.setOnCheckedChangeListener(listner); mBox2.setOnCheckedChangeListener(listner); mBox3.setOnCheckedChangeListener(listner); mBox4.setOnCheckedChangeListener(listner);

依据选择的checkbox返回计算结果，假设uncheck将清空文本，选择checkbox之前必需要输入两个数字。
所有代码：

package cn.terry; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.KeyEvent; import android.view.View; import android.view.View.OnKeyListener; import android.widget.*; import android.widget.CompoundButton.OnCheckedChangeListener; public class CheckBoxCalc extends Activity { private TextView mTextView; private TextView mTextView2; private TextView mTextView3; private TextView mTextView4; private CheckBox mBox1; private CheckBox mBox2; private CheckBox mBox3; private CheckBox mBox4; private EditText mEditText; private EditText mEditText1; private boolean isbool=true; private OnCheckedChangeListener listner; private Float Temp; private String Experssion; private OnKeyListener list; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTextView=(TextView)findViewById(R.id.result1); mTextView2=(TextView)findViewById(R.id.result2); mTextView3=(TextView)findViewById(R.id.result3); mTextView4=(TextView)findViewById(R.id.result4); mBox1=(CheckBox)findViewById(R.id.Plus); //加減乘除 mBox2=(CheckBox)findViewById(R.id.Cut); mBox3=(CheckBox)findViewById(R.id.Ride); mBox4=(CheckBox)findViewById(R.id.Except); mEditText=(EditText)findViewById(R.id.first); mEditText1=(EditText)findViewById(R.id.second); list=new OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { // TODO Auto-generated method stub if(mBox1.isChecked()) { mBox1.setChecked(false); } if(mBox2.isChecked()) { mBox2.setChecked(false); } if(mBox3.isChecked()) { mBox3.setChecked(false); } if(mBox4.isChecked()) { mBox4.setChecked(false); } return false; } }; mEditText.setOnKeyListener(list); mEditText1.setOnKeyListener(list); listner=new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub switch (buttonView.getId()) { case R.id.Plus: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox1.setChecked(false); return; } break; case R.id.Cut: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox2.setChecked(false); return; } break; case R.id.Ride: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox3.setChecked(false); return; } break; case R.id.Except: if(!isEmpty(mEditText,mEditText1)) { Confirm(); mBox4.setChecked(false); return; } break; default: break; } if(mBox1.isChecked()) { mTextView.setText( GetOperation(" +" )); } else { mTextView.setText(" " ); } if(mBox2.isChecked()) { mTextView2.setText(GetOperation(" -" )); } else { mTextView2.setText(" " ); } if(mBox3.isChecked()) { mTextView3.setText(GetOperation(" *" )); } else { mTextView3.setText(" " ); } if(mBox4.isChecked()) { mTextView4.setText(GetOperation(" /" )); } else { mTextView4.setText(" " ); } } }; mBox1.setOnCheckedChangeListener(listner); mBox2.setOnCheckedChangeListener(listner); mBox3.setOnCheckedChangeListener(listner); mBox4.setOnCheckedChangeListener(listner); } public String GetOperation(String Operation) { if(Operation==" +" ) { Temp=Float.parseFloat(mEditText.getText().toString())+ Float.parseFloat(mEditText1.getText().toString()); } if(Operation==" -" ) { Temp=Float.parseFloat(mEditText.getText().toString())- Float.parseFloat(mEditText1.getText().toString()); } if(Operation==" *" ) { Temp=Float.parseFloat(mEditText.getText().toString())* Float.parseFloat(mEditText1.getText().toString()); } if(Operation==" /" ) { Temp=Float.parseFloat(mEditText.getText().toString())/ Float.parseFloat(mEditText1.getText().toString()); } Experssion=mEditText.getText().toString()+Operation+mEditText1.getText().toString() +" =" +Temp.toString(); return Experssion; } public void Confirm() { new AlertDialog.Builder(CheckBoxCalc.this) .setTitle(" alert" ) .setMessage(" can not be null" ) .setPositiveButton(" OK" , new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub} }) .create().show(); } public boolean isEmpty(EditText e,EditText a) { if(e.getText().toString().length()> 0 & & a.getText().toString().length()> 0) { isbool= true; } else { isbool=false; } return isbool; } }

【Android-CheckBox 实现计算器】