logcat not showing debugging messages
<p><strong>logcat</strong> in Android Studio is not showing my generated outputs via <code>Log.v/.d</code> or any stacktraces after an unhandled runtime exception (like a nullpointer) and no further information when the app crashes. <code>Log.i/.w/.wtf/.e</code> messages are sometimes shown. Also <code>selfgenerated</code> messages from Android classes are shown (only sometimes!) and Android system outputs(normally always shown in logcat).</p>

<p>logcat filter settings are on "verbose" and "no filter" or "show only selected application" (both not solving my problem). Nothing entered in the searchmask. Restarting didn't solve the problem.</p>

<p>I tried out different smartphones and emulators with Android 5.1/6 and several projects/apps.</p>

<p>Example code (only more important messages than debug are shown):</p>

<pre><code>@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    Log.v(TAG, "verbose test");
    Log.d(TAG, "debug test");
    Log.i(TAG, "info test");
    Log.w(TAG, "warn test");
    Log.wtf(TAG, "what a terrible failure test");
    Log.e(TAG, "error test");
}
</code></pre>

<p>Edit: logcat output for the code above (with "verbose" &amp; "show only selected applictaion" filter options):</p>

<pre><code>12-02 22:01:13.531 14717-14717/? I/art: Late-enabling -Xcheck:jni

12-02 22:01:13.593 14717-14730/de.kinoblub.testapp E/HAL: load: id=gralloc != hmi-&gt;id=gralloc

12-02 22:01:13.621 14717-14717/de.kinoblub.testapp W/System: ClassLoader referenced unknown path: /data/app/de.kinoblub.testapp-1/lib/arm64

12-02 22:01:13.624 14717-14717/de.kinoblub.testapp I/InstantRun: Instant Run Runtime started. Android package is de.kinoblub.testapp, real application class is null.

12-02 22:01:13.717 14717-14717/de.kinoblub.testapp W/System: ClassLoader referenced unknown path: /data/app/de.kinoblub.testapp-1/lib/arm64

12-02 22:01:13.837 14717-14717/de.kinoblub.testapp I/HwCust: Constructor found for class android.app.HwCustHwWallpaperManagerImpl

12-02 22:01:13.883 14717-14717/de.kinoblub.testapp W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable

12-02 22:01:14.031 14717-14717/de.kinoblub.testapp I/de.kinoblub.testapp.Main2Activity: info test

12-02 22:01:14.031 14717-14717/de.kinoblub.testapp W/de.kinoblub.testapp.Main2Activity: warn test

12-02 22:01:14.031 14717-14717/de.kinoblub.testapp E/de.kinoblub.testapp.Main2Activity: what a terrible failure test

12-02 22:01:14.044 14717-14717/de.kinoblub.testapp E/de.kinoblub.testapp.Main2Activity: error test

12-02 22:01:14.067 14717-14717/de.kinoblub.testapp I/HwSecImmHelper: mSecurityInputMethodService is null

12-02 22:01:14.167 14717-14747/de.kinoblub.testapp E/HAL: load: id=gralloc != hmi-&gt;id=gralloc

12-02 22:01:14.167 14717-14747/de.kinoblub.testapp I/OpenGLRenderer: Initialized EGL, version 1.4

12-02 22:01:14.235 14717-14717/de.kinoblub.testapp I/HwSecImmHelper: mSecurityInputMethodService is null
</code></pre>