可编辑的Dialog

    final EditText et = new EditText(this);  

    new AlertDialog.Builder(this).setTitle("搜索")  
    .setIcon(android.R.drawable.ic_dialog_info)  
    .setView(et)  
    .setPositiveButton("确定", new OnClickListener() {  
        public void onClick(DialogInterface dialog, int which) {  
        String input = et.getText().toString();  
        if (input.equals("")) {  
            Toast.makeText(getApplicationContext(), "搜索内容不能为空！" + input, Toast.LENGTH_LONG).show();  
        }  
        else {  
            Intent intent = new Intent();  
            intent.putExtra("content", input);  
            intent.setClass(MainActivity.this, SearchActivity.class);  
            startActivity(intent);  
            }  
        }  
        })  
    .setNegativeButton("取消", null)  
    .show();