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Use strictmode strictmode principle (1)
2022-07-01 01:28:00 【Strange uncle Lori Kong】
List of articles
1. strictmode Get started with :
strictmode yes android Provides a dynamic detection mechanism for debugging environment , There are two main functions :
1.1 Thread strategy
Detect the main thread reading and writing jam
detectDiskReads(); detectDiskWrites();Detect whether the main thread uses the network
detectNetwork();Detect custom slow detection
detectCustomSlowCalls()Resource mismatch detection
detectResourceMismatches()No, buffer Of IO operation
detectUnbufferedIo()
Specific code location :
StrictMode#ThreadPolicy#Builder.detectAll
public @NonNull Builder detectAll() {
detectDiskReads();
detectDiskWrites();
detectNetwork();
final int targetSdk = VMRuntime.getRuntime().getTargetSdkVersion();
if (targetSdk >= Build.VERSION_CODES.HONEYCOMB) {
detectCustomSlowCalls();
}
if (targetSdk >= Build.VERSION_CODES.M) {
detectResourceMismatches();
}
if (targetSdk >= Build.VERSION_CODES.O) {
detectUnbufferedIo();
}
return this;
}
1.2 virtual machine VM Strategy
testing sqlite leak
detectLeakedSqlLiteObjects();testing activity leak : Note that here is the reference count , The actual leak cannot be detected , More on that later
detectActivityLeaks()Check whether it needs to be closed or not , such as IO flow
detectLeakedClosableObjectsCheck whether any component has forgotten to de register （BroadCastReceiver,Service）
detectLeakedRegistrationObjects()testing File Uri Is it exposed
detectFileUriExposure()Detect whether the network request is clear text
detectCleartextNetwork()Detect incorrect conext Use
detectIncorrectContextUse()Detect unsafe intent launch
detectUnsafeIntentLaunch()Source code ：
public @NonNull Builder detectAll() {
detectLeakedSqlLiteObjects();
final int targetSdk = VMRuntime.getRuntime().getTargetSdkVersion();
if (targetSdk >= Build.VERSION_CODES.HONEYCOMB) {
detectActivityLeaks();
detectLeakedClosableObjects();
}
if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN) {
detectLeakedRegistrationObjects();
}
if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
detectFileUriExposure();
}
if (targetSdk >= Build.VERSION_CODES.M) {
// TODO: always add DETECT_VM_CLEARTEXT_NETWORK once we have
// facility for apps to mark sockets that should be ignored
if (SystemProperties.getBoolean(CLEARTEXT_PROPERTY, false)) {
detectCleartextNetwork();
}
}
if (targetSdk >= Build.VERSION_CODES.O) {
detectContentUriWithoutPermission();
detectUntaggedSockets();
}
if (targetSdk >= Build.VERSION_CODES.Q) {
detectCredentialProtectedWhileLocked();
}
if (targetSdk >= Build.VERSION_CODES.R) {
detectIncorrectContextUse();
}
if (targetSdk >= Build.VERSION_CODES.S) {
detectUnsafeIntentLaunch();
}
// TODO: Decide whether to detect non SDK API usage beyond a certain API level.
// TODO: enable detectImplicitDirectBoot() once system is less noisy
return this;
}
1.3 Get started with
private fun strictModeOnDebug() {
if (BuildConfig.DEBUG && Build.VERSION.SDK_INT >= 28) {
StrictMode.setThreadPolicy(
ThreadPolicy.Builder()
.detectAll() // testing Thread All options
.penaltyLog() // Print log
.build()
)
StrictMode.setVmPolicy(
VmPolicy.Builder()
.detectAll() // testing VM All options
.penaltyLog() // Print log
.build()
)
TrafficStats.setThreadStatsTag(0xF00D)
}
}
1.3.1 Thread Test operation
- Monitor writes
findViewById<Button>(R.id.io_read_btn).setOnClickListener {
val outputStream = FileOutputStream(File(getExternalFilesDir("")?.path + "hello.json"))
outputStream.write("hello world".toByteArray())
outputStream.flush()
outputStream.close()
}
logcat journal :
2022-06-20 07:57:35.043 13012-13012/com.ifreedomer.strictmode D/StrictMode: StrictMode policy violation; ~duration=1 ms: android.os.strictmode.DiskWriteViolation
at android.os.StrictMode$AndroidBlockGuardPolicy.onWriteToDisk(StrictMode.java:1460)
at libcore.io.BlockGuardOs.write(BlockGuardOs.java:347)
at libcore.io.IoBridge.write(IoBridge.java:526)
at java.io.FileOutputStream.write(FileOutputStream.java:381)
at java.io.FileOutputStream.write(FileOutputStream.java:359)
at com.ifreedomer.strictmode.MainActivity.onCreate$lambda-0(MainActivity.kt:26)
at com.ifreedomer.strictmode.MainActivity.$r8$lambda$J_2M7j2bq49wREm_StCdiMLvSuc(Unknown Source:0)
at com.ifreedomer.strictmode.MainActivity$$ExternalSyntheticLambda0.onClick(Unknown Source:2)
at android.view.View.performClick(View.java:6597)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1194)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
The same goes for reading logs . It should be noted that ,IO We really need to do it regularly in the main thread , To avoid too many logs to interfere with the development , This option can be masked when recommended
1.3.2 VM Test operation
IO Detection is not turned off
Sample code :
findViewById<Button>(R.id.io_not_close_btn).setOnClickListener { var outputStream = FileOutputStream(File(getExternalFilesDir("")?.path + "hello.json")) outputStream.write("hello world".toByteArray()) outputStream = FileOutputStream(File(getExternalFilesDir("")?.path + "hello.json")) Runtime.getRuntime().gc() Runtime.getRuntime().gc() }logcat:
2022-06-20 08:11:36.071 13677-13687/com.ifreedomer.strictmode D/StrictMode: StrictMode policy violation: android.os.strictmode.LeakedClosableViolation: A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks. at android.os.StrictMode$AndroidCloseGuardReporter.report(StrictMode.java:1786) at dalvik.system.CloseGuard.warnIfOpen(CloseGuard.java:264) at java.io.FileOutputStream.finalize(FileOutputStream.java:475) at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:250) at java.lang.Daemons$FinalizerDaemon.runInternal(Daemons.java:237) at java.lang.Daemons$Daemon.run(Daemons.java:103) at java.lang.Thread.run(Thread.java:764) Caused by: java.lang.Throwable: Explicit termination method 'close' not called at dalvik.system.CloseGuard.open(CloseGuard.java:221) at java.io.FileOutputStream.<init>(FileOutputStream.java:241) at java.io.FileOutputStream.<init>(FileOutputStream.java:180) at com.ifreedomer.strictmode.MainActivity.onCreate$lambda-4(MainActivity.kt:57) at com.ifreedomer.strictmode.MainActivity.$r8$lambda$sFdQJzxyBqsXzAQCFxp0PCpUtgg(Unknown Source:0) at com.ifreedomer.strictmode.MainActivity$$ExternalSyntheticLambda3.onClick(Unknown Source:2) at android.view.View.performClick(View.java:6597) at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1194) at android.view.View.performClickInternal(View.java:6574) at android.view.View.access$3100(View.java:778) at android.view.View$PerformClick.run(View.java:25885) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6669) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)Database leak detection
cursor Not closed
findViewById<Button>(R.id.database_open_btn).setOnClickListener {
val readableDatabase =
dbHelper.readableDatabase
var rawQuery = readableDatabase.rawQuery("select * from user", null)
val sqLiteCursor = rawQuery as SQLiteCursor
sqLiteCursor.moveToFirst()
Log.d(TAG,"sql window = ${sqLiteCursor.window}")
rawQuery = null
readableDatabase.close()
Runtime.getRuntime().gc()
}
logcat：
2022-06-20 08:00:19.687 13012-13022/com.ifreedomer.strictmode D/StrictMode: StrictMode policy violation: android.os.strictmode.SqliteObjectLeakedViolation: Finalizing a Cursor that has not been deactivated or closed. database = /data/user/0/com.ifreedomer.strictmode/databases/haha.db, table = null, query = select * from user
at android.os.StrictMode.onSqliteObjectLeaked(StrictMode.java:1956)
at android.database.sqlite.SQLiteCursor.finalize(SQLiteCursor.java:285)
at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:250)
at java.lang.Daemons$FinalizerDaemon.runInternal(Daemons.java:237)
at java.lang.Daemons$Daemon.run(Daemons.java:103)
at java.lang.Thread.run(Thread.java:764)
Caused by: android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
at android.database.sqlite.SQLiteCursor.<init>(SQLiteCursor.java:103)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:52)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1408)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1347)
at com.ifreedomer.strictmode.MainActivity.onCreate$lambda-2(MainActivity.kt:43)
at com.ifreedomer.strictmode.MainActivity.$r8$lambda$KlEPG7__y4DedDU3EV-gqJ4mzpo(Unknown Source:0)
at com.ifreedomer.strictmode.MainActivity$$ExternalSyntheticLambda3.onClick(Unknown Source:2)
at android.view.View.performClick(View.java:6597)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1194)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
1.4 Set listening
If you want to get this leaked information , You can do it yourself StrictMode Of Listener
if (BuildConfig.DEBUG && Build.VERSION.SDK_INT >= 28) {
StrictMode.setThreadPolicy(
ThreadPolicy.Builder()
.detectAll()
.penaltyLog()
.penaltyListener(Executors.newSingleThreadExecutor(),{
})
.build()
)
StrictMode.setVmPolicy(
VmPolicy.Builder()
.detectAll()
.penaltyLog()
.penaltyListener(Executors.newSingleThreadExecutor(),{
})
.build()
)
}
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