How to make breakpoints in Runnable() break in Android studio?

By : Hong

I have checked quite a few related SO posts, but been unable to get I am looking for. My question is very simple and straightforward. Here is the code:

new Thread(new Runnable() {
    public void run() {
            android.util.Log.d("Debug", "*****breakpoint******");

I have set a breakpoint at android.util.Log.d(), so I know it is executed, but it never breaks. Breakpoints in other places work fine. I am running Android Studio 1.5.1 on Windows 10. I am using an emulator to do the test.

Could anyone offer a tip on this?

Per request, the following are screenshots of the code and logcat respectively: enter image description here enter image description here

By : Hong

    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), ''
            signingConfig signingConfigs.config1
            debuggable false
        debug {
            minifyEnabled false

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By: admin