Android开发实现popupWindow弹出窗口自定义布局与位置控制方法

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package com.example.bige;
import android.support.v4.widget.PopupWindowCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
  Button mbtn;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_main);
    View root = this.getLayoutInflater().inflate(R.layout.number,null);
    //设置弹出布局自适应大小
    final PopupWindow popup = new PopupWindow(root, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
    mbtn = (Button) findViewById(R.id.num1);
    mbtn.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        // popup.isShowing();
        Toast.makeText(MainActivity.this, "hh", Toast.LENGTH_SHORT).show();
         //控制pupup弹出位置在父布局的中间显示
         //四个参数分别表示，要参考的控件view，相对位置，后边两个参数int x，int y表示偏移
        popup.showAtLocation(view, Gravity.CENTER,0,0);
      }
    });
  }
}