Activity初级：resultCode返回码、 onclick代码重构

主页：

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public class MainActivity extends Activity {     /**      * 主页点击按钮跳转到第二页      * 第二页点击按钮1将字符串内容显示到主页，点击按钮2将数字内容显示到主页      */     private final static int RESULT_CODE_ONE = 1;     private final static int RESULT_CODE_TWO = 2;     @Override     protected void onActivityResult(int requestCode, int resultCode, Intent data)     {         super.onActivityResult(requestCode, resultCode, data);         TextView textView = (TextView) findViewById(R.id.textView1_main);         String text = null;         switch (resultCode)//判断返回码         {             case RESULT_CODE_ONE:                 text = "from按钮1:" + data.getStringExtra("btnone");                 break;             case RESULT_CODE_TWO:                 int age = data.getIntExtra("btntwo", 0);//0为默认值，当data没有接收到返回的int时，返回这个默认值                 text ="from按钮2:"+ String.valueOf(age);                 break;             default:                 break;         }         textView.setText(text);     }                                                                 @Override     protected void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);                                                                         findViewById(R.id.button1_main).setOnClickListener(new OnClickListener()         {             @Override             public void onClick(View v)             {                 Intent intent = new Intent(MainActivity.this, SecondActivity.class);                 startActivityForResult(intent , 0);             }         });     }                                                                 @Override     public boolean onCreateOptionsMenu(Menu menu)     {         getMenuInflater().inflate(R.menu.main, menu);         return true;     } }

第二页

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public class SecondActivity extends Activity {     private final static int RESULT_CODE_ONE = 1;     private final static int RESULT_CODE_TWO = 2;     @Override     protected void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_second);         final Intent data = new Intent();         findViewById(R.id.button1).setOnClickListener(new OnClickListener()         {                                                            @Override             public void onClick(View v)             {                 data.putExtra("btnone", "name");                 setResult(RESULT_CODE_ONE, data );//设置返回码                 finish();             }         });                                                    findViewById(R.id.button2).setOnClickListener(new OnClickListener()         {             @Override             public void onClick(View v)             {                 data.putExtra("btntwo", 12);                 setResult(RESULT_CODE_TWO, data );//设置返回码                 finish();             }         });                                                }                                            @Override     public boolean onCreateOptionsMenu(Menu menu)     {         getMenuInflater().inflate(R.menu.second, menu);         return true;     } }

第二页按钮事件重构过程一：

1.实现OnClickListener接口

2.重写onClick(View v)

3.findViewById(R.id.button1).setOnClickListener(this)

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public class SecondActivity extends Activity implements OnClickListener//实现监听者接口 {     private final static int RESULT_CODE_ONE = 1;     private final static int RESULT_CODE_TWO = 2;                    @Override     public void onClick(View v)//重写点击方法     {         Intent data = new Intent();         if(v.getId() == R.id.button1)//判断view的id         {             data.putExtra("btnone", "name");             setResult(RESULT_CODE_ONE, data );             finish();         }         if(v.getId() == R.id.button2)         {             data.putExtra("btntwo", 12);             setResult(RESULT_CODE_TWO, data );             finish();         }     }                     @Override     protected void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_second);                             findViewById(R.id.button1).setOnClickListener(this);//监听按钮         findViewById(R.id.button2).setOnClickListener(this);     }                     @Override     public boolean onCreateOptionsMenu(Menu menu)     {         getMenuInflater().inflate(R.menu.second, menu);         return true;     } }

第二页按钮事件重构过程二：将事件内容以方法代替

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public class SecondActivity extends Activity implements OnClickListener//实现监听者接口 {     private final static int RESULT_CODE_ONE = 1;     private final static int RESULT_CODE_TWO = 2;                 @Override     public void onClick(View v)//重写点击方法     {         Intent data = new Intent();         if(v.getId() == R.id.button1)//判断view的id         { //            data.putExtra("btnone", "name"); //            setResult(RESULT_CODE_ONE, data ); //            finish();             sendResult("btnone", "name", RESULT_CODE_ONE);         }         if(v.getId() == R.id.button2)         { //            data.putExtra("btntwo", 12); //            setResult(RESULT_CODE_TWO, data ); //            finish();             sendResult("btntwo", Integer.valueOf(12), RESULT_CODE_TWO);         }     }                               private void sendResult(String extraKey, Object content, int resultCode)     {         Intent data = new Intent();         if (content instanceof String)         {             data.putExtra(extraKey, (String) content);         }         else if (content instanceof Integer)         {             data.putExtra(extraKey, (Integer) content);         }         setResult(resultCode, data);         finish();     }                  @Override     protected void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_second);                          findViewById(R.id.button1).setOnClickListener(this);//监听按钮         findViewById(R.id.button2).setOnClickListener(this);     }                  @Override     public boolean onCreateOptionsMenu(Menu menu)     {         getMenuInflater().inflate(R.menu.second, menu);         return true;     } }

本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1198584，如需转载请自行联系原作者