主方法中只是调用

private void showpop(View v ){
        View pv = View.inflate(this,R.layout.popwindow, null);
        TextView tv_photo = (TextView)pv.findViewById(R.id.tv_msg);
        final PopupWindow pop = new PopupWindow(pv, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        
        pop.setOutsideTouchable(true);
        pop.setBackgroundDrawable(new ColorDrawable(0*00000000));
        
        pop.setFocusable(true);
        tv_photo.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                
                Toast.makeText(MainActivity.this,"拍照",Toast.LENGTH_SHORT).show();
                pop.dismiss();      
                
            }
        });
        
    }

重新写一个类

    private Context context;
    private String msg ;
    private String btnConfirm ;
    private String btnCancel ;
    private TextView tv_msg ;
    private Button btn_confirm ;
    private Button btn_cancel ;
    
    public MyDialig(Context context,String msg,String btnConfirm,String btnCancel) {

        super(context,R.style.mydialog);
        // TODO Auto-generated constructor stub
        this.context = context;
        this.msg = msg ;
        this.btnCancel = btnCancel;
        this.btnConfirm = btnConfirm;
    }
 
    private MyClickListener listener ;

创建一个接口

    public interface MyClickListener{
        public void confirm() ;
        public void cancel() ;  
    }

给接口赋值

    public void setClickListener    (MyClickListener listener){
        this.listener = listener;

    }      

      protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.text1);
            tv_msg = (TextView)findViewById(R.id.tv_msg);
            btn_confirm =(Button)findViewById(R.id.btn_confirm);
            btn_cancel = (Button)findViewById(R.id.btn_cancel);
            
            tv_msg.setText(msg);
            btn_cancel.setText(btnCancel);
            btn_confirm.setText(btnConfirm);
            
            btn_cancel.setOnClickListener(this);
            btn_confirm.setOnClickListener(this);

设置Dialog大小

            Window windows = getWindow();

WindowManager主要用来管理窗口的一些状态、属性

            WindowManager wm = ((Activity)context).getWindowManager();

获取当前对话框的参数值
设置和获得当前窗口的一些属性

   WindowManager.LayoutParams params =windows.getAttributes(); 

设置窗口显示的位置

            windows.setGravity(Gravity.CENTER);

获取屏幕的宽高

            Display display = wm.getDefaultDisplay();

把屏幕的宽度设为0.6

            params.width = (int) (display.getWidth()*0.6);
            windows.setAttributes(params);       
      }

  @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

触发主方法中的 方法

            switch (v.getId()) {
            case R.id.btn_confirm:
                listener.confirm();
                dismiss();      
                break;
            case R.id.btn_cancel:
                listener.cancel();
                dismiss();
                break;
            }
        }
     }