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; 
    } 
  } 
}