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dBm = -113 + 2 * asu  #2G
dBm = -140 + asu      #4G

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I/ActivityManagerService(  443): Low on memory:
I/ActivityManagerService(  443):   ntv   N     4118 kB: zygote (pid 161) native
I/ActivityManagerService(  443):   ntv   N     2814 kB: surfaceflinger (pid 142) native
I/ActivityManagerService(  443):   ntv   N     1986 kB: logd (pid 136) native
I/ActivityManagerService(  443):   ntv   N     1925 kB: mediaserver (pid 157) native
I/ActivityManagerService(  443):   ntv   N     2749 kB: (Other native)
I/ActivityManagerService(  443):   sys   P    24827 kB: system (pid 443) fixed
I/ActivityManagerService(  443):   pers  P    37707 kB: com.android.systemui (pid 612) fixed
I/ActivityManagerService(  443):   pers  P    13423 kB: com.android.phone (pid 819) fixed
I/ActivityManagerService(  443):   pers  P     8760 kB: com.android.inputmethod.latin (pid 706) fixed
I/ActivityManagerService(  443):   pers  P     5996 kB: android.process.media (pid 575) fixed
I/ActivityManagerService(  443):   pers  P     3577 kB: com.cghs.stresstest (pid 796) fixed
I/ActivityManagerService(  443):   fore  T   153394 kB: com.dlc.huishouxiang (pid 24324) top-activity
I/ActivityManagerService(  443):             261276 kB: TOTAL
I/ActivityManagerService(  443):   MemInfo: 25032 kB slab, 140 kB shmem, 379704 kB vm alloc, 7532 kB page el stack
I/ActivityManagerService(  443):            132 kB buffers, 86556 kB cached, 42500 kB mapped, 180476 kB free
I/ActivityManagerService(  443):   ZRAM: 5652 kB RAM, 520908 kB swap total, 503928 kB swap free
I/ActivityManagerService(  443):   Free RAM: 224664 kB
I/ActivityManagerService(  443):   Used RAM: 677980 kB
I/ActivityManagerService(  443):   Lost RAM: 1158732 kB
I/ActivityManagerService(  443): Start proc 3350:com.android.smspush/u0a43 for service com.android.smspush/.WapPushManager

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allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}
dependencies {
        implementation 'com.github.licheedev:AdPlayer:1.0.3'
        implementation 'com.github.bumptech.glide:glide:4.9.0'
}

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/**
 * Fixes a leak caused by AudioManager using an Activity context. 
 * Tracked at https://android-review.googlesource.com/#/c/140481/1 and
 * https://github.com/square/leakcanary/issues/205
 */
public class AudioServiceActivityLeak extends ContextWrapper {

  AudioServiceActivityLeak(Context base) {
    super(base);
  }

  public static ContextWrapper preventLeakOf(Context base) {
    return new AudioServiceActivityLeak(base);
  }

  @Override public Object getSystemService(String name) {
    if (Context.AUDIO_SERVICE.equals(name)) {
      return getApplicationContext().getSystemService(name);
    }
    return super.getSystemService(name);
  }
}

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public class ActivityUsingVideoView extends Activity {
  
  @Override protected void attachBaseContext(Context base) {
    super.attachBaseContext(AudioServiceActivityLeak.preventLeakOf(base));
  }
}

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package cn.trinea.android.lib.util;
 
import android.util.Log;
import cn.trinea.android.lib.util.BuildConfig;
 
public class LogUtils {
 
    public static void d(String log) {
        if (BuildConfig.DEBUG) {
            Log.d("trinea-debug", log);
        }
    }
    //……
}

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if(recyclerView.canScrollHorizontally(scrollDirection)){
    recyclerView.scrollBy(2 * scrollDirection, 2 * scrollDirection);
}else{  //改变方向
    scrollDirection = -scrollDirection;
}

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mRecycleView.setLayoutManager(new LinearLayoutManager(this.getContext(),
        LinearLayoutManager.HORIZONTAL, false));

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Camera.Parameters parameters = camera.getParameters();
parameters.getPreviewFormat();

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private static final int VALUE_FOR_4_ALIGN = 0b11;
private static final int VALUE_FOR_2_ALIGN = 0b01;

/**
    * 确保传给引擎的NV21数据宽度为4的倍数，高为2的倍数
    *
    * @param bitmap 传入的bitmap
    * @return 调整后的bitmap
    */
public static Bitmap alignBitmapForNv21(Bitmap bitmap) {
    if (bitmap == null || bitmap.getWidth() < 4 || bitmap.getHeight() < 2) {
        return null;
    }
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();

    boolean needAdjust = false;
    //保证宽度是4的倍数
    if ((width & VALUE_FOR_4_ALIGN) != 0) {
        width &= ~VALUE_FOR_4_ALIGN;
        needAdjust = true;
    }

    //保证高度是2的倍数
    if ((height & VALUE_FOR_2_ALIGN) != 0) {
        height--;
        needAdjust = true;
    }

    if (needAdjust) {
        bitmap = imageCrop(bitmap, new Rect(0, 0, width, height));
    }
    return bitmap;
}