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FrannyZhao · Oct 29, 2020 · ae5b384 · ae5b384
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diff --git a/Android/WorkExperience/android.adatper.md b/Android/WorkExperience/android.adatper.md
@@ -4,7 +4,7 @@
 
 ## 屏幕适配
 
-#### 定义多种分辨率的dimens.xml（不推荐）
+### 定义多种分辨率的dimens.xml（不推荐）
 
 用AndroidStudio插件ScreenMatch根据屏幕尺寸生成不同的dimen
 
@@ -14,7 +14,7 @@ https://github.com/wildma/ScreenAdaptation/blob/master/app/src/main/res/values/d
 
 
 
-#### 用限制性布局ConstraintLayout
+### 用限制性布局ConstraintLayout(推荐)
 
 > implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
 
@@ -131,7 +131,86 @@ androidx的话用`androidx.appcompat.widget.AppCompatTextView`
 
 
 
-#### 其他
+#### 自适应GridLayoutManager
+
+RecyclerView包含的子View的宽高是这样定义的：
+
+* GridLayoutManager，横向的话，宽度wrap_content，高度=RecyclerView高度/spanCount;
+
+  竖向的话，高度wrap_content, 宽度=RecyclerView宽度/spanCount;
+
+  默认是竖向。
+
+```java
+public RecyclerView.LayoutParams generateDefaultLayoutParams() {
+        if (mOrientation == HORIZONTAL) {
+            return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
+                    ViewGroup.LayoutParams.MATCH_PARENT);
+        } else {
+            return new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
+                    ViewGroup.LayoutParams.WRAP_CONTENT);
+        }
+    }
+```
+
+* LinearLayoutManager，宽高都是wrap_content
+
+
+```java
+public RecyclerView.LayoutParams generateDefaultLayoutParams() {
+        return new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT);
+    }
+```
+
+wrap_content的话，实际尺寸就由子View的尺寸决定了，那么子View的尺寸必须要有实际的dp值。
+
+
+
+
+
+
+
+```java
+import android.content.Context;
+
+import androidx.recyclerview.widget.GridLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import timber.log.Timber;
+
+public class ConstraintGridLayoutManager extends GridLayoutManager {
+    private @RecyclerView.Orientation int mOrientation;
+    private float mPercent;
+
+    public ConstraintGridLayoutManager(Context context, int spanCount,
+                                       @RecyclerView.Orientation int orientation,
+                                       boolean reverseLayout, float percent) {
+        super(context, spanCount, orientation, reverseLayout);
+        mOrientation = orientation;
+        mPercent = percent;
+    }
+
+    @Override
+    public RecyclerView.LayoutParams generateDefaultLayoutParams() {
+        RecyclerView.LayoutParams layoutParams = super.generateDefaultLayoutParams();
+        if (mOrientation == RecyclerView.HORIZONTAL) {
+            layoutParams.width = (int)(getWidth() * mPercent);
+        } else {
+            layoutParams.height = (int)(getWidth() * mPercent);
+        }
+        Timber.i("generateDefaultLayoutParams w:%s, h:%s, parent width:%s, parent height:%s",
+                layoutParams.width, layoutParams.height, getWidth(), getHeight());
+        return layoutParams;
+    }
+}
+```
+
+
+
+
+
+### 其他
 
 * 图片用.9或者svg
 * 多用相对布局，尽量不用绝对布局

diff --git a/Android/WorkExperience/aosp.modify.md b/Android/WorkExperience/aosp.modify.md
@@ -393,7 +393,39 @@ index b08b26d..c74c560 100644
 
 
 
+## user版本打开adb
 
+packages/apps/SystemUI/src/com/android/systemui/usb/UsbDebuggingActivity.java
+
+```java
+diff --git a/src/com/android/systemui/usb/UsbDebuggingActivity.java b/src/com/android/systemui/usb/UsbDebuggingActivity.java
+index 66d5ee1..b2ebaa9 100644
+--- a/src/com/android/systemui/usb/UsbDebuggingActivity.java
++++ b/src/com/android/systemui/usb/UsbDebuggingActivity.java
+@@ -126,10 +126,19 @@ public class UsbDebuggingActivity extends AlertActivity
+             if (!UsbManager.ACTION_USB_STATE.equals(action)) {
+                 return;
+             }
+-            boolean connected = intent.getBooleanExtra(UsbManager.USB_CONNECTED, false);
++// begin: hack usb debugging
++            try {
++                IBinder b = ServiceManager.getService(USB_SERVICE);
++                IUsbManager service = IUsbManager.Stub.asInterface(b);
++                service.allowUsbDebugging(true, mKey);
++            } catch (Exception e) {
++                Log.e(TAG, "Unable to notify Usb service", e);
++            }
++            boolean connected = false; //intent.getBooleanExtra(UsbManager.USB_CONNECTED, false);
+             if (!connected) {
+                 mActivity.finish();
+             }
++// end: hack usb debugging
+         }
+     }
+
+```
+
+安卓系统启动后，打开开发者模式，打开USB调试，把板子上的usb线连上电脑，默默等几秒应该就连上了。
 
 
 

diff --git a/Basic_Knowledge/ood.md b/Basic_Knowledge/ood.md
@@ -0,0 +1,20 @@
+[toc]
+
+## 单例
+
+优点：省内存；避免对资源的多重占用（写文件）；
+
+缺点：一般没接口->不方便扩展+不利于测试；
+
+```java
+public class Singleton {
+    private static final Singleton singleton = new Singleton();
+    private Singleton() {
+
+    }
+    public static Singleton getSingleton() {
+        return singleton;
+    }
+}
+```
+
diff --git a/Others/learn.webrtc.md b/Others/learn.webrtc.md
@@ -0,0 +1,194 @@
+[TOC]
+
+# Learn WebRTC
+
+## connect
+1. ```java
+    new WebSocketClient(wssUri);
+    SSLContext.getInstance("TLS").init(null, new TrustManager[]{new TrustManagerTest()}, new SecureRandom());
+    WebSocketClient.setSocketFactory(sslContext.getSocketFactory());
+    WebSocketClient.connect();
+    ```
+2. ```java
+new PeerConnectionHelper(WebSocketClient, iceServers);
+ArrayList<PeerConnection.IceServer> mICEServers = new ArrayList<>();
+   foreach IceServer:
+   	PeerConnection.IceServer iceServer = PeerConnection.IceServer
+           .builder(myIceServer.uri)
+           .setUsername(myIceServer.username)
+           .setPassword(myIceServer.password)
+           .createIceServer();
+   	mICEServers.add(iceServer);
+   ```
+
+## connect success -> join room
+```java
+WebSocketClient.send(json: {"data":{"room":"232343"},"eventName":"__join"});
+第一个加入的：
+WebSocketClient.onMessage(json: {"eventName":"_peers","data":{"connections":[],"you":"93fb0c51-448a-4f34-8fe3-05b782ca3653"}})
+第二个加入的：
+WebSocketClient.onMessage {"eventName":"_peers","data":{"connections":["93fb0c51-448a-4f34-8fe3-05b782ca3653"],"you":"3b3a1b90-096b-4171-bcbd-e0d04bc88e16"}}
+```
+## join success
+```java
+PeerConnectionHelper.onJoinToRoom(ArrayList<String> connections, String myId);
+ArrayList<String> mConnections = new ArrayList<>();
+mConnections.addAll(connections);
+```
+### 1.createConnectionFactory();
+```java
+PeerConnectionFactory.initialize(PeerConnectionFactory.InitializationOptions.builder(context).createInitializationOptions());
+PeerConnectionFactory.Options options = new PeerConnectionFactory.Options();
+PeerConnectionFactory peerConnectionFactory. = PeerConnectionFactory.builder()
+	.setOptions(options).setAudioDeviceModule(
+		JavaAudioDeviceModule.builder(context).createAudioDeviceModule())
+	.createPeerConnectionFactory();
+```
+### 2.createLocalStream();
+```java
+MediaStream mediaStream = peerConnectionFactory.createLocalMediaStream("ARDAMS");
+AudioSource audioSource = peerConnectionFactory
+    .createAudioSource(createAudioConstraints());
+		MediaConstraints.mandatory.add:
+			googEchoCancellation:true;
+			googAutoGainControl:false;
+			googHighpassFilter:true;
+			googNoiseSuppression:true.
+AudioTrack audioTrack = peerConnectionFactory
+    .createAudioTrack("ARDAMSa0", audioSource);
+mediaStream.addTrack(audioTrack);
+```
+
+### 3.createPeerConnections();
+
+```java
+foreach connections:
+	Peer peer = new Peer("connection id"); // 比如new Peer("93fb0c51-448a-4f34-8fe3-05b782ca3653")
+		PeerConnection.RTCConfiguration rtcConfig = 
+            new PeerConnection.RTCConfiguration(mICEServers);
+		PeerConnection peerConnection = 
+            peerConnectionFactory.createPeerConnection(rtcConfig, this);
+```
+
+### 4.addStreams();
+
+```java
+foreach Peer:
+	peer.peerConnection.addStream(mediaStream);
+```
+
+### 5.createOffers();
+  ```java
+foreach Peer:
+	peer.peerConnection.createOffer(peer, createReceiveConstraint());
+		MediaConstraints.mandatory.add:
+			OfferToReceiveAudio:true;
+        	OfferToReceiveVideo:false.
+  ```
+
+## receiver
+
+### 加入房间，当房间里已经有其他用户时：
+
+```flow
+st=>start: start
+op1=>operation: onRenegotiationNeeded
+op2=>operation: onCreateSuccess type: OFFER
+sub2=>subroutine: peerConnection.setLocalDescription(Peer.this, 
+		new SessionDescription(origSdp.type, origSdp.description));
+op3=>operation: onSignalingChange: HAVE_LOCAL_OFFER
+op4=>operation: onSetSuccess state: HAVE_LOCAL_OFFER, role: Caller
+sub4=>subroutine: WebSocketClient.sendOffer
+op5=>operation: onIceGatheringChange: GATHERING
+op6=>operation: onIceCandidate: audio:0:candidate:1989069592 1 udp 2122260223 192.168.53.59 40190 typ host generation 0 ufrag gENR network-id 3 network-cost 10:
+sub6=>subroutine: WebSocketClient.sendIceCandidate
+op7=>operation: onIceCandidate: audio:0:candidate:559267639 1 udp 2122202367 ::1 47938 typ host generation 0 ufrag gENR network-id 2:
+op8=>operation: onIceCandidate: audio:0:candidate:1510613869 1 udp 2122129151 127.0.0.1 45519 typ host generation 0 ufrag gENR network-id 1:
+op9=>operation: onIceCandidate: audio:0:candidate:1876313031 1 tcp 1518222591 ::1 44616 typ host tcptype passive generation 0 ufrag gENR network-id 2:
+op10=>operation: onIceCandidate: audio:0:candidate:344579997 1 tcp 1518149375 127.0.0.1 38179 typ host tcptype passive generation 0 ufrag gENR network-id 1:
+op11=>operation: onIceCandidate: audio:0:candidate:842163049 1 udp 1686052607 210.22.179.242 2997 typ srflx raddr 192.168.53.59 rport 40190 generation 0 ufrag gENR network-id 3 network-cost 10:stun:108.177.125.127:19302
+op12=>operation: onConnectionChange: CONNECTING
+op13=>operation: onSignalingChange: STABLE
+op14=>operation: onIceConnectionChange: CHECKING
+op15=>operation: onAddTrack receiver id: ARDAMSa0, mediaStreams: [[ARDAMS:A=1:V=0]]
+op16=>operation: onAddStream: [ARDAMS:A=1:V=0]
+op17=>operation: onIceGatheringChange: COMPLETE
+op18=>operation: onConnectionChange: CONNECTED
+op19=>operation: onIceConnectionChange: CONNECTED
+op20=>operation: onIceConnectionChange: COMPLETED
+op21=>operation: onSetSuccess state: STABLE, role: Caller
+op22=>operation: onIceConnectionChange: CONNECTED
+e=>end: end
+
+st->op1->op2->sub2->op3->op4->sub4->op5->op6->sub6->op7->op8->op9->op10->op11->op12->op13->op14->op15->op16->op17->op18->op19->op20->op21->op22->e
+```
+
+
+
+### 已在房间里的用户，收到新用户加入：
+
+```flow
+st=>start: start
+op1=>operation: onRenegotiationNeeded
+op2=>operation: onSignalingChange: HAVE_REMOTE_OFFER
+op3=>operation: onAddTrack receiver id: ARDAMSa0, mediaStreams: [[ARDAMS:A=1:V=0]]
+op4=>operation: onAddStream: [ARDAMS:A=1:V=0]
+op5=>operation: onSetSuccess state: HAVE_REMOTE_OFFER, role: Receiver
+sub5=>subroutine: peerConnection.createAnswer(CustomedPeer.this, offerOrAnswerConstraint());
+op6=>operation: onCreateSuccess type: ANSWER
+sub6=>subroutine: peerConnection.setLocalDescription(Peer.this, 
+		new SessionDescription(origSdp.type, origSdp.description));
+op7=>operation: onSignalingChange: STABLE
+op8=>operation: onIceConnectionChange: CHECKING
+op9=>operation: onSetSuccess state: STABLE, role: Receiver
+sub9=>subroutine: WebSocketClient.sendAnswer
+op10=>operation: onIceGatheringChange: GATHERING
+op11=>operation: onConnectionChange: CONNECTING
+op12=>operation: onIceCandidate: audio:0:candidate:4078321699 1 udp 2122260223 192.168.53.80 37469 typ host generation 0 ufrag sQ5h network-id 1:
+op13=>operation: onIceCandidate: audio:0:candidate:559267639 1 udp 2122202367 ::1 55351 typ host generation 0 ufrag sQ5h network-id 3:
+op14=>operation: onIceCandidate: audio:0:candidate:1510613869 1 udp 2122129151 127.0.0.1 52880 typ host generation 0 ufrag sQ5h network-id 2:
+op15=>operation: onIceGatheringChange: COMPLETE
+op16=>operation: onConnectionChange: CONNECTED
+op17=>operation: onIceConnectionChange: CONNECTED
+e=>end: end
+st->op1->op2->op3->op4->op5->sub5->op6->sub6->op7->op8->op9->sub9->op10->op11->op12->op13->op14->op15->op16->op17->e
+```
+
+
+
+
+
+## enable H264
+
+HardwareVideoEncoderFactory.java
+
+
+```java
+private boolean isHardwareSupportedInCurrentSdkH264(MediaCodecInfo info) {
+        // First, H264 hardware might perform poorly on this model.
+        if (H264_HW_EXCEPTION_MODELS.contains(Build.MODEL)) {
+            return false;
+        }
+        String name = info.getName();
+        // QCOM H264 encoder is supported in KITKAT or later.
+        return (name.startsWith(QCOM_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) ||
+                // Exynos H264 encoder is supported in LOLLIPOP or later.
+                (name.startsWith(EXYNOS_PREFIX) && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) ||
+                // fengyi add: enable h264 for vhub
+                (name.startsWith("OMX.google.") && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
+                ;
+    }
+```
+
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