卡顿优化

通过日志进行输出不规范的信息，在日志输出窗口中使用StrictMode进行过滤输出的信息
//在release版本中不建议开启严格模式
    private boolean DEV_MODE = true;
 
    /**
     * StrictMode 用来检测代码规范问题，有两种测量，一种是线程策略，一种是虚拟机策略
     */
    private void initStrictMode() {
        if (DEV_MODE) {
            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
                    .detectCustomSlowCalls()//检测执行缓慢的代码或者潜在的缓慢代码
                    .detectDiskReads()
                    .detectDiskWrites()
                    .detectNetwork()
                    .penaltyDialog()//弹窗违规提示框
                    .penaltyLog()//进行违规日志打印
                    .penaltyFlashScreen()
                    .build());
 
            StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
                    .detectActivityLeaks()//activity 泄漏
                    .detectLeakedClosableObjects()//未关闭的closeable对象泄漏
                    .detectLeakedSqlLiteObjects()//泄漏SQlite对象
                    .penaltyLog()
                    // .penaltyDeath()//使用严格模式，系统会做出相应的反应，比如打印日志，弹出对话框，以及崩溃，这里进行崩溃操作
                    .build());
        }
    }
 

// This must be in a local variable, in case a UI event sets the logger
Printer logging = me.mLogging;
if (logging != null) {
    logging.println(">>>>> Dispatching to " + msg.target + " " +
            msg.callback + ": " + msg.what);
}
 
msg.target.dispatchMessage(msg);
 
if (logging != null) {
    logging.println("<<<<< Finished to " + msg.target + " " + msg.callback);
}
 

/**
 * BlockCanary配置的各种信息
 */
public class AppBlockCanaryContext extends BlockCanaryContext {
 
    /**
     * Implement in your project.
     *
     * @return Qualifier which can specify this installation, like version + flavor.
     */
    @Override
    public String provideQualifier() {
        return "unknown";
    }
 
    /**
     * Implement in your project.
     *
     * @return user id
     */
    @Override
    public String provideUid() {
        return "uid";
    }
 
    /**
     * Network type
     *
     * @return {@link String} like 2G, 3G, 4G, wifi, etc.
     */
    @Override
    public String provideNetworkType() {
        return "unknown";
    }
 
    /**
     * Config monitor duration, after this time BlockCanary will stop, use
     * with {@code BlockCanary}'s isMonitorDurationEnd
     *
     * @return monitor last duration (in hour)
     */
    @Override
    public int provideMonitorDuration() {
        return -1;
    }
 
    /**
     * Config block threshold (in millis), dispatch over this duration is regarded as a BLOCK. You may set it
     * from performance of device.
     *
     * @return threshold in mills
     */
    @Override
    public int provideBlockThreshold() {
        return 500;
    }
 
    /**
     * Thread stack dump interval, use when block happens, BlockCanary will dump on main thread
     * stack according to current sample cycle.
     * <p>
     * Because the implementation mechanism of Looper, real dump interval would be longer than
     * the period specified here (especially when cpu is busier).
     * </p>
     *
     * @return dump interval (in millis)
     */
    @Override
    public int provideDumpInterval() {
        return provideBlockThreshold();
    }
 
    /**
     * Path to save log, like "/blockcanary/", will save to sdcard if can.
     *
     * @return path of log files
     */
    @Override
    public String providePath() {
        return "/blockcanary/";
    }
 
    /**
     * If need notification to notice block.
     *
     * @return true if need, else if not need.
     */
    @Override
    public boolean displayNotification() {
        return true;
    }
 
    /**
     * Implement in your project, bundle files into a zip file.
     *
     * @param src files before compress
     * @param dest files compressed
     * @return true if compression is successful
     */
    @Override
    public boolean zip(File[] src, File dest) {
        return false;
    }
 
    /**
     * Implement in your project, bundled log files.
     *
     * @param zippedFile zipped file
     */
    @Override
    public void upload(File zippedFile) {
        throw new UnsupportedOperationException();
    }
 
 
    /**
     * Packages that developer concern, by default it uses process name,
     * put high priority one in pre-order.
     *
     * @return null if simply concern only package with process name.
     */
    @Override
    public List<String> concernPackages() {
        return null;
    }
 
    /**
     * Filter stack without any in concern package, used with @{code concernPackages}.
     *
     * @return true if filter, false it not.
     */
    @Override
    public boolean filterNonConcernStack() {
        return false;
    }
 
    /**
     * Provide white list, entry in white list will not be shown in ui list.
     *
     * @return return null if you don't need white-list filter.
     */
    @Override
    public List<String> provideWhiteList() {
        LinkedList<String> whiteList = new LinkedList<>();
        whiteList.add("org.chromium");
        return whiteList;
    }
 
    /**
     * Whether to delete files whose stack is in white list, used with white-list.
     *
     * @return true if delete, false it not.
     */
    @Override
    public boolean deleteFilesInWhiteList() {
        return true;
    }
 
    /**
     * Block interceptor, developer may provide their own actions.
     */
    @Override
    public void onBlock(Context context, BlockInfo blockInfo) {
        Log.i("lz","blockInfo "+blockInfo.toString());
    }
}
 

 //给主线程造成卡顿，在子线程中获取锁，并让主线中等待20s，在让它获取锁
        new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (MainActivity.this){
                    try {
                        Thread.sleep(20000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
 //申请这把锁
        synchronized (MainActivity.this){
            LogUtils.i("");
        }