ProgressDialog的hide()和dismiss()方法

在使用ProgressDialog作为网络加载数据的请求过程中，当数据加载完成，笔者很自然的将ProgressDialog调用了hide()方法，在当前activity退出时，遇到问题了android.view.WindowLeaked: Activity com.xxx.xxx.hangup.ProgressDialogActivity has leaked window com.android.internal.policy.PhoneWindow$DecorView{dd0bacf G.E...... R.....I. 0,0-684,0} that was originally added here
这个问题是说当前dialog所依附的activity被销毁，dialog依然存在，未被销毁。这真是平时使用api时，没怎么注意的结果呀。调用hide()方法是可以实现dialog的隐藏，但是dialog对象并未销毁。
下面是一个简单的测试这种异常代码

public class ProgressDialogActivity extends Activity {private ProgressDialog pd;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//创建一个ProgressDialog，并执行show()方法pd = new ProgressDialog(this);pd.setMessage("在activity中showdialog后，直接退出activity异常");pd.setTitle("dialog异常测试");pd.show();}@Overrideprotected void onResume() {super.onResume();//暂时在onResume()中掉了dialog的hide()方法，然后我们执行手机back键，会发现异常log/*** 01-01 02:37:26.845: E/MultiWindowProxy(25617): getServiceInstance failed!01-01 02:37:30.569: E/WindowManager(25617): android.view.WindowLeaked: Activity com.xxx.xxx.hangup.ProgressDialogActivity has leaked window com.android.internal.policy.PhoneWindow$DecorView{dd0bacf G.E...... R.....I. 0,0-684,0} that was originally added here01-01 02:37:30.569: E/WindowManager(25617):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:460)01-01 02:37:30.569: E/WindowManager(25617):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:306)01-01 02:37:30.569: E/WindowManager(25617):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.Dialog.show(Dialog.java:326)01-01 02:37:30.569: E/WindowManager(25617):     at com.xxx.xxxx.hangup.ProgressDialogActivity.onCreate(ProgressDialogActivity.java:25)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.Activity.performCreate(Activity.java:6301)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2523)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2658)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.ActivityThread.-wrap11(ActivityThread.java)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1492)01-01 02:37:30.569: E/WindowManager(25617):     at android.os.Handler.dispatchMessage(Handler.java:111)01-01 02:37:30.569: E/WindowManager(25617):     at android.os.Looper.loop(Looper.java:207)01-01 02:37:30.569: E/WindowManager(25617):     at android.app.ActivityThread.main(ActivityThread.java:5741)01-01 02:37:30.569: E/WindowManager(25617):     at java.lang.reflect.Method.invoke(Native Method)01-01 02:37:30.569: E/WindowManager(25617):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)01-01 02:37:30.569: E/WindowManager(25617):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:685)*/if(pd != null){pd.hide();}   }
}

上面注释是异常log信息。

下面看下hide()和dismiss()方法的具体实现：
hide()源码实现如下：
/** * Hide the dialog, but do not dismiss it. */ public void hide() { if (mDecor != null) { mDecor.setVisibility(View.GONE); } }

很明确的看到dialog是一个view视图，而hide()实现中只是将view设置为gone，并未移除。
dialog的dismiss()方法如下：

 /*** Dismiss this dialog, removing it from the screen. This method can be* invoked safely from any thread.  Note that you should not override this* method to do cleanup when the dialog is dismissed, instead implement* that in {@link #onStop}.*/@Overridepublic void dismiss() {if (Looper.myLooper() == mHandler.getLooper()) {dismissDialog();} else {mHandler.post(mDismissAction);}}

在看下dismissDialog内的实现：

 void dismissDialog() {if (mDecor == null || !mShowing) {return;}if (mWindow.isDestroyed()) {Log.e(TAG, "Tried to dismissDialog() but the Dialog's window was already destroyed!");return;}try {mWindowManager.removeViewImmediate(mDecor);} finally {if (mActionMode != null) {mActionMode.finish();}mDecor = null;mWindow.closeAllPanels();onStop();mShowing = false;sendDismissMessage();}}

看到了mWindowManager.removeViewImmediate(mDecor)的代码。
至此，dialog的view才被真正移除。
希望小伙伴们不要犯和我一样的low的错误。。。

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