让ProgressDialog在setCancelable(false)时按返回键可dismiss

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package cn.winfirm.examples.base;import android.app.Activity;import android.app.ProgressDialog;import android.content.DialogInterface;import android.content.DialogInterface.OnKeyListener;import android.os.Bundle;import android.view.KeyEvent;import android.view.Window;/** * Activity的基类，带一个ProgressDialog，可双击取消其显示 *  * @author savant *  */public class BaseActivity extends Activity {    private ProgressDialog progressDialog = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);    }    /**     * show loading progress dialog     */    public void showDialog() {        if (null == progressDialog) {            progressDialog = ProgressDialog.show(BaseActivity.this, "", "正在加载，请稍候...");            progressDialog.setCancelable(false);        } else {            progressDialog.show();        }        progressDialog.setOnKeyListener(onKeyListener);    }    /**     * add a keylistener for progress dialog     */    private OnKeyListener onKeyListener = new OnKeyListener() {        @Override        public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {            if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {                dismissDialog();            }            return false;        }    };    /**     * dismiss dialog     */    public void dismissDialog() {        if (isFinishing()) {            return;        }        if (null != progressDialog && progressDialog.isShowing()) {            progressDialog.dismiss();        }    }    /**     * cancel progress dialog if nesseary     */    @Override    public void onBackPressed() {        if (progressDialog != null && progressDialog.isShowing()) {            dismissDialog();        } else {            super.onBackPressed();        }    }}

最近发现Android4.0系统中ProgressDialog设置为setCancelable(true)时，点击ProgressDialog以外的区域也可以让ProgressDialog dismiss掉。但有时我们不希望是这样的效果，于是将ProgressDialog设置setCancelable(false)，再点击ProgressDialog以外的区域就不会出现前面所说的情况了，然而这样以来再按返回键时就不起作用了，只能等待程序执行到dissmiss处为止。其实，只要为ProgressDialog添加KeyListener来对返回键予以处理就可以解决这个问题了。

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