Android仿微信网络加载弹出框

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>

public class CustomDialog extends Dialog {
  private String content;

  public CustomDialog(Context context, String content) {
    super(context, R.style.CustomDialog);
    this.cOntent=content;
    initView();
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch (keyCode){
      case KeyEvent.KEYCODE_BACK:
        if(CustomDialog.this.isShowing())
          CustomDialog.this.dismiss();
        break;
    }
    return true;
  }

  private void initView(){
    setContentView(R.layout.dialog_view);
    ((TextView)findViewById(R.id.tvcontent)).setText(content);
    setCanceledOnTouchOutside(true);
    WindowManager.LayoutParams attributes = getWindow().getAttributes();
    attributes.alpha=0.8f;
    getWindow().setAttributes(attributes);
    setCancelable(false);
  }
}

CustomDialog customDialog = new CustomDialog(this, "正在加载...");
customDialog.show();//显示,显示时页面不可点击,只能点击返回
customDialog.dismiss();//消失