android乘法计算器

 1 package com.zachary.multiplication;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.view.Menu;
 7 import android.view.MenuItem;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 import android.widget.EditText;
12 
13 public class EnterActivity extends Activity {
14 
15     private Button myButton = null;
16     private EditText factorOne = null;
17     private EditText factorTwo = null;
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_enter);
22         factorOne = (EditText)findViewById(R.id.factorOne);
23         factorTwo = (EditText)findViewById(R.id.factorTwo);
24         myButton = (Button)findViewById(R.id.resultButton);
25         myButton.setOnClickListener(new MyButtonListener());
26     }
27 
28     @Override
29     public boolean onCreateOptionsMenu(Menu menu) {
30         // Inflate the menu; this adds items to the action bar if it is present.
31         getMenuInflater().inflate(R.menu.enter, menu);
32         menu.add(0,1,1,R.string.exit);
33         menu.add(0,2,2,R.string.about);
34         return true;
35     }
36     
37     @Override
38     public boolean onOptionsItemSelected(MenuItem item) {
39         // TODO Auto-generated method stub
40         if(item.getItemId()==1)
41             finish();
42         return super.onOptionsItemSelected(item);
43     }
44 
45     class MyButtonListener implements OnClickListener {
46 
47         @Override
48         public void onClick(View arg0) {
49             // TODO Auto-generated method stub
50             String factorOneStr = factorOne.getText().toString();
51             String factorTwoStr = factorTwo.getText().toString();
52             Intent intent = new Intent();
53             intent.putExtra("num1",factorOneStr);
54             intent.putExtra("num2",factorTwoStr);
55             intent.setClass(EnterActivity.this, ResultActivity.class);
56             EnterActivity.this.startActivity(intent);
57         }
58     }
59 }

 1 package com.zachary.multiplication;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.widget.TextView;
 7 
 8 public class ResultActivity extends Activity{
 9 
10     private TextView resultTextView = null;
11     @Override
12     protected void onCreate(Bundle savedInstanceState) {
13         // TODO Auto-generated method stub
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_result);
16         Intent intent = getIntent();
17         resultTextView = (TextView)findViewById(R.id.resultTextView);
18         int factorOneNum = Integer.parseInt(intent.getStringExtra("num1"));
19         int factorTwoNum = Integer.parseInt(intent.getStringExtra("num2"));
20         int resultNum = factorOneNum * factorTwoNum;
21         resultTextView.setText(resultNum+"");
22     }
23 
24 }

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:orientation="vertical" android:layout_width="fill_parent"
 3     android:layout_height="fill_parent">
 4     <EditText android:id="@+id/factorOne"
 5         android:layout_width="fill_parent"
 6         android:layout_height="wrap_content"
 7         android:hint="@string/editText"
 8         android:numeric="integer"
 9         />
10     <TextView android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         android:text="@string/mult"
13         />
14     <EditText android:id="@+id/factorTwo"
15         android:layout_width="fill_parent"
16         android:layout_height="wrap_content"
17         android:hint="@string/editText"
18         android:numeric="integer"
19         />
20     <Button android:id="@+id/resultButton"
21         android:layout_width="fill_parent"
22         android:layout_height="wrap_content"
23         android:text="@string/result"
24         />"
25 </LinearLayout>

1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
2     android:orientation="vertical" android:layout_width="fill_parent"
3     android:layout_height="fill_parent">
4     <TextView android:id="@+id/resultTextView"
5         android:layout_width="wrap_content"
6         android:layout_height="wrap_content"
7         />    
8 </LinearLayout>

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原文地址：https://www.cnblogs.com/wizzhangquan/p/2951868.html