懸浮對話框Android代碼實現

直接上代碼： 

  private void setDialog(){
    View view = getLayoutInflater().inflate(R.layout.dialog_country, null);
    mDialog = new Dialog(this);
    mDialog.setContentView(view, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
    Window window = mDialog.getWindow();
    WindowManager.LayoutParams wl = window.getAttributes();
    wl.x = 0;
    wl.y = getWindowManager().getDefaultDisplay().getHeight();
    wl.width = ViewGroup.LayoutParams.MATCH_PARENT;
    wl.height = ViewGroup.LayoutParams.WRAP_CONTENT;
    mDialog.onWindowAttributesChanged(wl);
    mDialog.setCanceledOnTouchOutside(true);
    mDialog.show();
    
    Button btnChina = (Button) view.findViewById(R.id.btnChina);
    Button btnUSA = (Button) view.findViewById(R.id.btnUSA);
    Button btnUK = (Button) view.findViewById(R.id.btnUK);
    Button btnCancel = (Button) view.findViewById(R.id.btnCancel);
    
    btnChina.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        mQuery.id(R.id.btnCountry).getTextView().setText("China");
        mDialog.dismiss();
      }      
    });
    btnUSA.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        mQuery.id(R.id.btnCountry).getTextView().setText("USA");
        mDialog.dismiss();
      }      
    });
    btnUK.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        mQuery.id(R.id.btnCountry).getTextView().setText("UK");
        mDialog.dismiss();
      }      
    });
    btnCancel.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        mDialog.dismiss();
      }      
    });
  } 

首先inflate一個xml文件，產生一個view；再創建一個Dialog，設置Dialog的View為inflate的view；然後通過WindowManager.LayoutParams設置Dialog的長度、寬度、顯示的位置等等，最後setCanceledOnTouchOutside(true)，點擊其他地方可以退出Dialog。運行效果如下：

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