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2012年11月15日 星期四

Android - AlertDialog (進階問題大雜燴)

AlertDialog有很多用法

下面提供一些比較進階的問題





Q1:如何讓Dialog不會被back鍵 及 觸碰空白處取消

A:(參考)

public class CantBeDismissDialog extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //AlertDialog builder物件
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        
        //設定AlertDialog內容
        builder.setTitle("系統提示")
            .setMessage("請問你是男生還是女生?")
            .setPositiveButton("Boy", null)
            .setNegativeButton("Girl", null)
            .setCancelable(false);  //設定back鍵無法dismiss dialog
        
        //建立AlertDialog
        AlertDialog alert = builder.create();
        //顯示AlertDialog
        alert.show();
        
        //註冊key event listener
        alert.setOnKeyListener(new OnKeyListener()
        {
      @Override
      public boolean onKey(DialogInterface dialog, int code, KeyEvent event) {
       if(code==KeyEvent.KEYCODE_SEARCH) //如果按下Search鈕
        return true;
       else
        return false;
      }                  
        });
    }
}


Q2:如何自定義AlertDialog & 如何在AlertDialog內放置元件

A:參考 http://cookiesp.pixnet.net/blog/post/77342445




Q3:如何產生橫的AlertDialog

A:參考



//產生dialog
AlertDialog dialog = new AlertDialog.Builder(this)
        .setTitle("Test Dialog")
        .setMessage("This should expand to the full width")
        .show();
//Grab the window of the dialog, and change the width
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
Window window = dialog.getWindow();
lp.copyFrom(window.getAttributes());
//This makes the dialog take up the full width
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
window.setAttributes(lp);


 Q4:如何自定AlertDialog的位置

A:

AlertDialog dlg = new AlertDialog.Builder(context).create();
      LayoutInflater flater = LayoutInflater.from(context);
      View view = flater.inflate(R.layout.mode_tv_layout2_gridview_dialog, null);
      dlg.setView(view);
      dlg.show();
      方法一
      Window window = dlg.getWindow();
      
      window.setGravity(Gravity.BOTTOM);//BOTTOM為底部 可自選
方法二

WindowManager.LayoutParams lp = new WindowManager.LayoutParams(); 
Window window = dlg.getWindow(); 
lp = window.getAttributes(); 
lp.alpha = 0.5f;//透明度 
lp.y = 100;//高度 
window.setAttributes(lp);






 Q5:

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