Android 笔记 a+b day6

独立写了自己第一个Android app ———–a+b！！！！！

自己手机Android版本4.2太低，安装时会出现解析失败，装到室友手机上就好了~~

happy~~

 package com.example.tt1; import android.app.Activity; import android.os.Bundle; import android.view.*; import android.widget.Button; import android.widget.*; public class MainActivity extends Activity {     ;     private EditText add1;     private EditText add2;     private TextView textsum;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         Button button=(Button)this.findViewById(R.id.button1);         textsum=(TextView)findViewById(R.id.sum);         button.setOnClickListener(new ButtonClickListener());     }     private class ButtonClickListener implements View.OnClickListener{         @Override         public void onClick(View v) {             // TODO Auto-generated method stub             add1=(EditText)findViewById(R.id.add1);             add2=(EditText)findViewById(R.id.add2);             int a1=Integer.parseInt( add1.getText().toString());             int a2=Integer.parseInt( add2.getText().toString());             sum=a1+a2;             textsum.setText(String.valueOf(sum) );              Toast.makeText(getApplicationContext(), ).show();             }         }     @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);     } }