ruijun / blockcanary

A transparent ui-block detection library for Android.

中文

BlockCanary

A transparent ui-block detection library for Android. App only needs one-line-code to setup and provide application context.

Getting started

dependencies {
    // or you can use compile directly if want to enable it in release package and upload log file to server
    // compile 'com.github.moduth:blockcanary:1.0.1'
    debugCompile 'com.github.moduth:blockcanary:1.0.1'
    releaseCompile 'com.github.moduth:blockcanary-no-op:1.0.1'
}

Usage

public class DemoApplication extends Application {
    @Override
    public void onCreate() {
        ...
        // Do it on main process
        BlockCanary.install(this, new AppBlockCanaryContext()).start();
    }
}

Implement BlockCanaryContext context：

public class AppBlockCanaryContext extends BlockCanaryContext {
    // override to provide context like app qualifier, uid, network type, block threshold, log save path

    // this is default block threshold, you can set it by phone's performance
    @Override
    public int getConfigBlockThreshold() {
        return 500;
    }

    // if set true, notification will be shown, else only write log file
    @Override
    public boolean isNeedDisplay() {
        return BuildConfig.DEBUG;
    }

    // path to save log file
    @Override
    public String getLogPath() {
        return "/blockcanary/performance";
    }
}

How does it work?

See BlockCanary.

1. BlockCanary.install() initializes context and internal data structures.
2. BlockCanary.start() starts monitor by Looper.getMainLooper().setMessageLogging(mMainLooperPrinter);
3. ThreadStackSampler and CpuSampler start catching thread stack and cpu data.
4. Each time a message dispatch costs time over that set by BlockCanaryContext.getConfigBlockThreshold, it triggers a block notify.
5. Write log file with data for analysis.
6. If BlockCanaryContext.isNeedDisplay is true, a notification is shown, developer can click and check directly.

Screenshot