Android回调——Android模块化编程

在MainActivity中，启动新Activity时调的不是StartActivity（）方法，而是 startActivityForResult

    
    
    
    

     
     
     
     
 
       Intent intent = new Intent(); 
     
     
     
     
     
 
       intent.setClass(MainActivity.this, OtherActivity.class); 
     
     
     
     
     
 
       intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
     
     
     
     
     
 
       startActivityForResult(intent, SCANNIN_GREQUEST_CODE);// 
      SCANNIN_GREQUEST_CODE是一个标识，回调识别 
     
    
    
    
    

     
     
     
     

      
      
      
      
 
        private final static int SCANNIN_GREQUEST_CODE = 3;// 返回扫码 
      
      
      
      
      
 
        private static final int CONTACT_REQUEST_CODE = 2;// 返回通讯录 
      
     
     
     
     

在OtherActivity中，可以这样做：监听按钮，setResult

    
    
    
    

     
     
     
     
 
      //按钮监听 
     
     
     
     
     
 
       private OnClickListener btnClick = new OnClickListener() { 
     
     
     
     
     
 
       public void onClick(View v) { 
     
     
     
     
     
 
       switch (v.getId()) { 
     
     
     
     
     
 
       case R.id.btn_add: 
     
     
     
     
     
 
       Intent intent = getIntent(); 
     
     
     
     
     
 
       Bundle bundle = new Bundle(); 
     
     
     
     
     
 
       String bundleStr = numberStr; 
     
     
     
     
     
 
       if (bundleStr != "") { 
     
     
     
     
     
 
       bundleStr = bundleStr.substring(1); 
     
     
     
     
     
 
       } 
     
     
     
     
     
 
       bundle.putString("numberStr", bundleStr); 
     
     
     
     
     
 
       intent.putExtras(bundle); 
     
     
     
     
     
 
       setResult(RESULT_OK, intent); 
     
     
     
     
     
 
       finish(); 
     
     
     
     
     
 
       break; 
     
     
     
     
     
 
        
     
     
     
     
     
 
       case R.id.btn_back: 
     
     
     
     
     
 
       finish(); 
     
     
     
     
     
 
       break; 
     
     
     
     
     
 
       } 
     
     
     
     
     
 
       } 
     
     
     
     
     
 
       }; 
     
    
    
    
    

在OtherActivity中，也可以这样做：方法有很多，不一一总结：

    
    
    
    

     
     
     
     
 
      import android.app.Activity; 
     
     
     
     
     
 
      import android.view.SurfaceHolder; 
     
     
     
     
     
 
      import android.view.SurfaceHolder.Callback; 
     
     
     
     
     
 
        
     
     
     
     
     
 
      public class TestActivity extends Activity implements Callback { 
     
     
     
     
     
 
        
     
     
     
     
     
 
       @Override 
     
     
     
     
     
 
       public void surfaceCreated(SurfaceHolder holder) { 
     
     
     
     
     
 
       // TODO Auto-generated method stub 
     
     
     
     
     
 
        
     
     
     
     
     
 
       } 
     
     
     
     
     
 
        
     
     
     
     
     
 
       @Override 
     
     
     
     
     
 
       public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 
     
     
     
     
     
 
       // TODO Auto-generated method stub 
     
     
     
     
     
 
        
     
     
     
     
     
 
       } 
     
     
     
     
     
 
        
     
     
     
     
     
 
       @Override 
     
     
     
     
     
 
       public void surfaceDestroyed(SurfaceHolder holder) { 
     
     
     
     
     
 
       // TODO Auto-generated method stub 
     
     
     
     
     
 
        
     
     
     
     
     
 
       } 
     
     
     
     
     
 
        
     
     
     
     
     
 
      } 
     
    
    
    
    

在MainActivity中，回调时这样执行：

    
    
    
    

     
     
     
     
 
       @Override 
     
     
     
     
     
 
       protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     
     
     
     
     
 
       // TODO Auto-generated method stub 
     
     
     
     
     
 
       // super.onActivityResult(requestCode, resultCode, data); 
     
     
     
     
     
 
       // Toast.makeText(MainActivity.this, "进来了", Toast.LENGTH_SHORT).show(); 
     
     
     
     
     
 
       switch (requestCode) { 
     
     
     
     
     
 
       case SCANNIN_GREQUEST_CODE://其他Activity A回调 
     
     
     
     
     
 
       if (resultCode == RESULT_OK) { 
     
     
     
     
     
 
       //要执行的内容 
     
     
     
     
     
 
       } 
     
     
     
     
     
 
       break; 
     
     
     
     
     
 
        
     
     
     
     
     
 
       case CONTACT_REQUEST_CODE://其他Activity B回调 
     
     
     
     
     
 
       if (resultCode == RESULT_OK) { 
     
     
     
     
     
 
       Toast.makeText(this, "程序B回调", Toast.LENGTH_SHORT).show(); 
     
     
     
     
     
 
       } 
     
     
     
     
     
 
       break; 
     
     
     
     
     
 
       } 
     
     
     
     
     
 
       }