我使用ACRA报告应用程序崩溃。我得到了一个视图没有附加到窗口管理器错误消息，并认为我已经通过包装pDialog.dismiss()修复了它;在if语句中:
if (pDialog!=null)
{
if (pDialog.isShowing())
{
pDialog.dismiss();
}
}
它减少了我收到的未附加到窗口管理器崩溃的视图数量，但我仍然得到一些，我不确定如何解决它。
错误信息:
java.lang.IllegalArgumentException: View not attached to window manager
at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:425)
at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:327)
at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:83)
at android.app.Dialog.dismissDialog(Dialog.java:330)
at android.app.Dialog.dismiss(Dialog.java:312)
at com.package.class$LoadAllProducts.onPostExecute(class.java:624)
at com.package.class$LoadAllProducts.onPostExecute(class.java:1)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5419)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
at dalvik.system.NativeStart.main(Native Method)
代码片段:
class LoadAllProducts extends AsyncTask<String, String, String>
{
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute()
{
super.onPreExecute();
pDialog = new ProgressDialog(CLASS.this);
pDialog.setMessage("Loading. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args)
{
// Building Parameters
doMoreStuff("internet");
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url)
{
// dismiss the dialog after getting all products
if (pDialog!=null)
{
if (pDialog.isShowing())
{
pDialog.dismiss(); //This is line 624!
}
}
something(note);
}
}
清单:
<activity
android:name="pagename.CLASS"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize|screenLayout"
android:label="@string/name" >
</activity>
为了阻止撞车，我错过了什么?
我有办法重现这个异常。
我使用2 AsyncTask。一个人做长任务，另一个人做短任务。在短任务完成后，调用finish()。当长任务完成并调用Dialog.dismiss()时，它崩溃了。
下面是我的示例代码:
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
private ProgressDialog mProgressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "onCreate");
new AsyncTask<Void, Void, Void>(){
@Override
protected void onPreExecute() {
mProgressDialog = ProgressDialog.show(MainActivity.this, "", "plz wait...", true);
}
@Override
protected Void doInBackground(Void... nothing) {
try {
Log.d(TAG, "long thread doInBackground");
Thread.sleep(20000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.d(TAG, "long thread onPostExecute");
if (mProgressDialog != null && mProgressDialog.isShowing()) {
mProgressDialog.dismiss();
mProgressDialog = null;
}
Log.d(TAG, "long thread onPostExecute call dismiss");
}
}.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
new AsyncTask<Void, Void, Void>(){
@Override
protected Void doInBackground(Void... params) {
try {
Log.d(TAG, "short thread doInBackground");
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
Log.d(TAG, "short thread onPostExecute");
finish();
Log.d(TAG, "short thread onPostExecute call finish");
}
}.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy");
}
}
您可以尝试这样做，并找出解决此问题的最佳方法。
根据我的研究，至少有4种方法可以解决这个问题:
@erakitin的回答:调用isFinishing()来检查活动的状态
@Kapé的回答是:设置flag来检查活动的状态
使用try/catch来处理它。
调用onDestroy()中的AsyncTask.cancel(false)。它将阻止asynctask执行onPostExecute()，而是执行onCancelled()。
注意:onPostExecute()仍然会执行，即使你调用AsyncTask.cancel(false)在旧的Android操作系统，如Android 2.X.X。
你可以选择最适合你的。
我有办法重现这个异常。
我使用2 AsyncTask。一个人做长任务，另一个人做短任务。在短任务完成后，调用finish()。当长任务完成并调用Dialog.dismiss()时，它崩溃了。
下面是我的示例代码:
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
private ProgressDialog mProgressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "onCreate");
new AsyncTask<Void, Void, Void>(){
@Override
protected void onPreExecute() {
mProgressDialog = ProgressDialog.show(MainActivity.this, "", "plz wait...", true);
}
@Override
protected Void doInBackground(Void... nothing) {
try {
Log.d(TAG, "long thread doInBackground");
Thread.sleep(20000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.d(TAG, "long thread onPostExecute");
if (mProgressDialog != null && mProgressDialog.isShowing()) {
mProgressDialog.dismiss();
mProgressDialog = null;
}
Log.d(TAG, "long thread onPostExecute call dismiss");
}
}.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
new AsyncTask<Void, Void, Void>(){
@Override
protected Void doInBackground(Void... params) {
try {
Log.d(TAG, "short thread doInBackground");
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
Log.d(TAG, "short thread onPostExecute");
finish();
Log.d(TAG, "short thread onPostExecute call finish");
}
}.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
@Override
protected void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy");
}
}
您可以尝试这样做，并找出解决此问题的最佳方法。
根据我的研究，至少有4种方法可以解决这个问题:
@erakitin的回答:调用isFinishing()来检查活动的状态
@Kapé的回答是:设置flag来检查活动的状态
使用try/catch来处理它。
调用onDestroy()中的AsyncTask.cancel(false)。它将阻止asynctask执行onPostExecute()，而是执行onCancelled()。
注意:onPostExecute()仍然会执行，即使你调用AsyncTask.cancel(false)在旧的Android操作系统，如Android 2.X.X。
你可以选择最适合你的。
首先，崩溃的原因是decorView的索引是-1，我们可以从Android源代码中知道，有代码片段:
类:android.view.WindowManagerGlobal
文件:WindowManagerGlobal.java
private int findViewLocked(View view, boolean required) {
final int index = mViews.indexOf(view);
//here, view is decorView,comment by OF
if (required && index < 0) {
throw new IllegalArgumentException("View=" + view + " not attached to window manager");
}
return index;
}
所以我们得到了跟随分辨率，只是判断decorView的索引，如果它大于0，那么继续，或者只是返回并放弃解散，代码如下:
try {
Class<?> windowMgrGloable = Class.forName("android.view.WindowManagerGlobal");
try {
Method mtdGetIntance = windowMgrGloable.getDeclaredMethod("getInstance");
mtdGetIntance.setAccessible(true);
try {
Object windownGlobal = mtdGetIntance.invoke(null,null);
try {
Field mViewField = windowMgrGloable.getDeclaredField("mViews");
mViewField.setAccessible(true);
ArrayList<View> mViews = (ArrayList<View>) mViewField.get(windownGlobal);
int decorViewIndex = mViews.indexOf(pd.getWindow().getDecorView());
Log.i(TAG,"check index:"+decorViewIndex);
if (decorViewIndex < 0) {
return;
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
if (pd.isShowing()) {
pd.dismiss();
}
