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;                                  }                                  }

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