Android-java.lang.RuntimeException: Package manager has died问题

记录下今天遇到的一个bug。

异常Log：

CustomerExceptionHandler:pool-8-thread-5java.lang.RuntimeException: Package manager has died
E/hp      (13562):  at android.app.ApplicationPackageManager.getInstalledPackages(ApplicationPackageManager.java:464)
E/hp      (13562):  at android.app.ApplicationPackageManager.getInstalledPackages(ApplicationPackageManager.java:454)
E/hp      (13562):  at com.handpay.zztong.hp.utils.Util.getAppInstalled(Util.java:34)
E/hp      (13562):  at com.handpay.zztong.hp.NewMainActivity1$1.run(NewMainActivity1.java:134)
E/hp   (13562):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
E/hp      (13562):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
E/hp      (13562):  at java.lang.Thread.run(Thread.java:841)
E/hp      (13562): Caused by: android.os.TransactionTooLargeException
E/hp      (13562):  at android.os.BinderProxy.transact(Native Method)
E/hp      (13562):  at android.content.pm.IPackageManager$Stub$Proxy.getInstalledPackages(IPackageManager.java:2528)
E/hp      (13562):  at android.app.ApplicationPackageManager.getInstalledPackages(ApplicationPackageManager.java:461)

在activity中有线程去获取手机安装的app应用，结果在某些手机上退出重新进入会出现 Package manager has died错误。

原因：Binder调用出错了，看其源码（frameworks/base/core/jni/android_util_Binder.cpp）应该可以得知 如果Binder的使用超出了一个进程的限制就会抛出TransactionTooLargeException这个异常。如果是其他原因造成Binder crash的话就会抛出RuntimeException。

从frameworks/native/libs/binder/ProcessState.cpp中得知一个进程的Binder的内存限制为（大约1M）

#define BINDER_VM_SIZE ((1*1024*1024) - (4096 *2))

解决方案：

executorService.execute(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
synchronized(NewMainActivity1.class) {
List<String> pks = Util.getAppInstalled(NewMainActivity1.this);
}
}
});

在调用前加synchronized同步锁 避免多个线程同时来调用Binder导致crash。