Android实现蒙版弹出框效果

package cn.lxsdb.yyd.app.dialog;  import cn.lxsdb.yyd.app.R; import cn.lxsdb.yyd.app.constants.AppIntent; import android.app.Dialog; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.view.WindowManager.LayoutParams; import android.widget.ImageButton;  public class RegisterDialog extends Dialog implements   android.view.View.OnClickListener {   private ImageButton cancel;  private ImageButton experienceNow;  Context context;  View registerView;     public RegisterDialog(Context context) {   super(context);   this.context = context;  }   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   requestWindowFeature(Window.FEATURE_NO_TITLE);    // 这句代码换掉dialog默认背景，否则dialog的边缘发虚透明而且很宽   // 总之达不到想要的效果   getWindow().setBackgroundDrawableResource(android.R.color.transparent);   registerView = View.inflate(this.context, R.layout.layout_register_dialog, null);   setContentView(registerView);   // 这句话起全屏的作用   getWindow().setLayout(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);    initView();   initListener();  }   @Override  public boolean onTouchEvent(MotionEvent event) {   this.dismiss();   return super.onTouchEvent(event);  }   private void initListener() {   cancel.setOnClickListener(this);   experienceNow.setOnClickListener(this);  }   private void initView() {   cancel = (ImageButton) findViewById(R.id.ib_close);   experienceNow = (ImageButton) findViewById(R.id.ib_register_now);   }   public void onClick(View v) {   switch (v.getId()) {   case R.id.ib_close:    this.dismiss();    break;   case R.id.ib_register_now:    // 注册    Intent intent = AppIntent.getRegPhoneActivity(this.context);    context.startActivity(intent);    this.dismiss();    break;   }  } }