Toast Crash on Android 7.1
相信很多 Android 开发者都见过像这样的崩溃：
android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@e2815e is not valid; is your activity running?
at android.view.ViewRootImpl.setView(ViewRootImpl.java:679)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:342)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
at android.widget.Toast$TN.handleShow(Toast.java:459)
at android.widget.Toast$TN$2.handleMessage(Toast.java:342)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
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The Root Cause
通过 APM 平台分析发现，这个问题仅发生在 Android 7.1 (API Level 25) 版本，所以断定，这是 Android 7.1 的系统 bug，通过查看源码，我们可以看到：
public class Toast {
final TN mTN;
public void handleShow(IBinder windowToken) {
if (localLOGV) Log.v(TAG, "HANDLE SHOW: " + this + " mView=" + mView
+ " mNextView=" + mNextView);
if (mView != mNextView) {
// remove the old view if necessary
handleHide();
mView = mNextView;
Context context = mView.getContext().getApplicationContext();
String packageName = mView.getContext().getOpPackageName();
if (context == null) {
context = mView.getContext();
}
mWM = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
// We can resolve the Gravity here by using the Locale for getting
// the layout direction
final Configuration config = mView.getContext().getResources().getConfiguration();
final int gravity = Gravity.getAbsoluteGravity(mGravity, config.getLayoutDirection());
mParams.gravity = gravity;
if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == Gravity.FILL_HORIZONTAL) {
mParams.horizontalWeight = 1.0f;
}
if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.FILL_VERTICAL) {
mParams.verticalWeight = 1.0f;
}
mParams.x = mX;
mParams.y = mY;
mParams.verticalMargin = mVerticalMargin;
mParams.horizontalMargin = mHorizontalMargin;
mParams.packageName = packageName;
mParams.hideTimeoutMilliseconds = mDuration ==
Toast.LENGTH_LONG ? LONG_DURATION_TIMEOUT : SHORT_DURATION_TIMEOUT;
mParams.token = windowToken;
if (mView.getParent() != null) {
if (localLOGV) Log.v(TAG, "REMOVE! " + mView + " in " + this);
mWM.removeView(mView);
}
if (localLOGV) Log.v(TAG, "ADD! " + mView + " in " + this);
mWM.addView(mView, mParams); // 👈👈👈👈 崩溃发生在这里
trySendAccessibilityEvent();
}
}
private static class TN extends ITransientNotification.Stub {
final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW: {
IBinder token = (IBinder) msg.obj;
handleShow(token);
break;
}
case HIDE: {
handleHide();
// Don't do this in handleHide() because it is also invoked by handleShow()
mNextView = null;
break;
}
case CANCEL: {
handleHide();
// Don't do this in handleHide() because it is also invoked by handleShow()
mNextView = null;
try {
getService().cancelToast(mPackageName, TN.this);
} catch (RemoteException e) {
}
break;
}
}
}
};
}
}
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How To Solve It?
在 Android O (API Level 26) 源码中，这个问题已经被修复了，修复方法就是简单粗暴的 try-catch：
public class Toast {
final TN mTN;
public void handleShow(IBinder windowToken) {
if (localLOGV) Log.v(TAG, "HANDLE SHOW: " + this + " mView=" + mView
+ " mNextView=" + mNextView);
// If a cancel/hide is pending - no need to show - at this point
// the window token is already invalid and no need to do any work.
if (mHandler.hasMessages(CANCEL) || mHandler.hasMessages(HIDE)) {
return;
}
if (mView != mNextView) {
// remove the old view if necessary
handleHide();
mView = mNextView;
Context context = mView.getContext().getApplicationContext();
String packageName = mView.getContext().getOpPackageName();
if (context == null) {
context = mView.getContext();
}
mWM = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
// We can resolve the Gravity here by using the Locale for getting
// the layout direction
final Configuration config = mView.getContext().getResources().getConfiguration();
final int gravity = Gravity.getAbsoluteGravity(mGravity, config.getLayoutDirection());
mParams.gravity = gravity;
if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == Gravity.FILL_HORIZONTAL) {
mParams.horizontalWeight = 1.0f;
}
if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.FILL_VERTICAL) {
mParams.verticalWeight = 1.0f;
}
mParams.x = mX;
mParams.y = mY;
mParams.verticalMargin = mVerticalMargin;
mParams.horizontalMargin = mHorizontalMargin;
mParams.packageName = packageName;
mParams.hideTimeoutMilliseconds = mDuration ==
Toast.LENGTH_LONG ? LONG_DURATION_TIMEOUT : SHORT_DURATION_TIMEOUT;
mParams.token = windowToken;
if (mView.getParent() != null) {
if (localLOGV) Log.v(TAG, "REMOVE! " + mView + " in " + this);
mWM.removeView(mView);
}
if (localLOGV) Log.v(TAG, "ADD! " + mView + " in " + this);
// Since the notification manager service cancels the token right
// after it notifies us to cancel the toast there is an inherent
// race and we may attempt to add a window after the token has been
// invalidated. Let us hedge against that.
try {
mWM.addView(mView, mParams);
trySendAccessibilityEvent();
} catch (WindowManager.BadTokenException e) { // 👈👈👈👈 忽略掉异常
/* ignore */
}
}
}
}
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所以，Booster 也简单粗暴的将异常 catch 住，只不过，catch 的不是 mWM.addView(mView, mParams)，而是 Toast$TN 这个内部类的 mHandler，给它设置一个 Handler.Callback：
public class ShadowToast {
/**
* Fix {@code WindowManager$BadTokenException} for Android N
*
* @param toast
* The original toast
*/
public static void show(final Toast toast) {
if (Build.VERSION.SDK_INT == 25) {
workaround(toast).show();
} else {
toast.show();
}
}
private static Toast workaround(final Toast toast) {
final Object tn = getFieldValue(toast, "mTN");
if (null == tn) {
Log.w(TAG, "Field mTN of " + toast + " is null");
return toast;
}
final Object handler = getFieldValue(tn, "mHandler");
if (handler instanceof Handler) {
if (setFieldValue(handler, "mCallback", new CaughtCallback((Handler) handler))) {
return toast;
}
}
final Object show = getFieldValue(tn, "mShow");
if (show instanceof Runnable) {
if (setFieldValue(tn, "mShow", new CaughtRunnable((Runnable) show))) {
return toast;
}
}
Log.w(TAG, "Neither field mHandler nor mShow of " + tn + " is accessible");
return toast;
}
}
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在 booster-transform-toastopen in new window 中，将 Toast 类及其子类的 show() 方法调用替换成 ShadowToast.show(Toast)。
Getting Started
修复 Toast 在 Android 7.1 的 bug 只需要引入 booster-transform-toastopen in new window 即可，如下所示：
buildscript {
ext {
kotlin_version = "1.5.31"
booster_version = "4.16.3"
}
repositories {
mavenCentral()
google()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.5.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "com.didiglobal.booster:booster-gradle-plugin:$booster_version"
/* 👇👇👇👇 引用这个模块 👇👇👇👇 */
classpath "com.didiglobal.booster:booster-transform-toast:$booster_version"
}
}
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