code perfect

.idea/codeStyles/Project.xml

+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <codeStyleSettings language="XML">
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+  </code_scheme>
+</component>
\ No newline at end of file

app/src/main/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="com.mxdl.customview">
+    package="com.mxdl.customview">
 
     <application
         android:name="com.mxdl.MyApplication"
@@ -10,25 +10,21 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".CricleCaptureViewActivity">
-        </activity>
-        <activity android:name="com.mxdl.CaptureViewActivity1">
-        </activity>
-        <activity android:name="com.mxdl.CaptureViewActivity">
-        </activity>
-        <activity android:name=".HorizontalScrollViewActivity">
-        </activity>
-        <activity android:name=".PinnedHeaderActivity">
-        </activity>
+        <activity android:name=".RectCaptureViewActivity"></activity>
+        <activity android:name=".CricleCaptureViewActivity"></activity>
+        <activity android:name="com.mxdl.CaptureViewActivity1"></activity>
+        <activity android:name="com.mxdl.CaptureViewActivity"></activity>
+        <activity android:name=".HorizontalScrollViewActivity"></activity>
+        <activity android:name=".PinnedHeaderActivity"></activity>
         <activity android:name=".MainActivity">
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
 
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity android:name=".StickyLayoutActivity"/>
-        <activity android:name=".HorizontalScrollViewExActivity"/>
+        <activity android:name=".StickyLayoutActivity" />
+        <activity android:name=".HorizontalScrollViewExActivity" />
     </application>
 
 </manifest>
\ No newline at end of file

app/src/main/java/com/mxdl/customview/MainActivity.java

@@ -25,6 +25,7 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
     private Button mBtnCaptrueView;
     private Button mBtnCaptrueView1;
     private Button mBtnCricleCapture;
+    private Button mBtnRectCapture;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -38,6 +39,8 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         mBtnCaptrueView1 = findViewById(R.id.btn_capture_view1);
         mBtnCricleCapture = findViewById(R.id.btn_cricle_capture);
 
+        mBtnRectCapture = findViewById(R.id.btn_rect_capture);
+
         mBtnStickyLayout.setOnClickListener(this);
         mBtnHorizontalScrollViewEx.setOnClickListener(this);
         mBtnHorizontalScrollView.setOnClickListener(this);
@@ -45,6 +48,7 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         mBtnCaptrueView.setOnClickListener(this);
         mBtnCaptrueView1.setOnClickListener(this);
         mBtnCricleCapture.setOnClickListener(this);
+        mBtnRectCapture.setOnClickListener(this);
     }
 
     @Override
@@ -71,6 +75,9 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
             case R.id.btn_cricle_capture:
                 startActivity(new Intent(this, CricleCaptureViewActivity.class));
                 break;
+            case R.id.btn_rect_capture:
+                startActivity(new Intent(this, RectCaptureViewActivity.class));
+                break;
         }
     }
 }

app/src/main/java/com/mxdl/customview/RectCaptureViewActivity.java

+package com.mxdl.customview;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+
+public class RectCaptureViewActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_rect_capture_view);
+    }
+}

app/src/main/java/com/mxdl/customview/view/RectCaptureView.java

+package com.mxdl.customview.view;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.Region;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+import android.support.annotation.RequiresApi;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+
+import com.mxdl.customview.R;
+
+/**
+ * Description: <RectCaptureView><br>
+ * Author:      mxdl<br>
+ * Date:        2019/10/12<br>
+ * Version:     V1.0.0<br>
+ * Update:     <br>
+ */
+public class RectCaptureView extends View {
+    public static final String TAG = RectCaptureView.class.getSimpleName();
+    private int mWidth;
+    private Rect mScreenRect = new Rect();
+    private Rect mCaptureRect = new Rect();
+    private Paint mBorderPaint = new Paint();
+    private Path mCapturePath = new Path();
+    private Paint mAreaPaint = new Paint();
+    private Drawable mAnchorDrawable;
+    private int mHalfAnchorWidth;
+    private int mLastX;
+    private int mLastY;
+    private int mHitCorner;
+
+    public RectCaptureView(Context context) {
+        super(context);
+        initView();
+    }
+
+    public RectCaptureView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        initView();
+    }
+
+    public RectCaptureView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        initView();
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
+    public RectCaptureView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        initView();
+    }
+
+    public void initView() {
+        setLayerType(View.LAYER_TYPE_SOFTWARE, null);
+        mWidth = (int) (getResources().getDisplayMetrics().density * 216 + 0.5f);
+        mBorderPaint.setStrokeWidth(getResources().getDisplayMetrics().density * 2);
+        mBorderPaint.setStyle(Paint.Style.STROKE);
+        mBorderPaint.setAntiAlias(true);
+        mBorderPaint.setColor(Color.parseColor("#1E88E5"));
+
+        mAreaPaint.setStyle(Paint.Style.FILL_AND_STROKE);
+        mAreaPaint.setColor(Color.parseColor("#1E88E5"));
+        mAreaPaint.setAlpha(20);
+
+        mAnchorDrawable = getResources().getDrawable(R.mipmap.ic_edit_fence_dragger);
+        mHalfAnchorWidth = mAnchorDrawable.getIntrinsicWidth() / 2;
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        super.onLayout(changed, left, top, right, bottom);
+        Log.v(TAG, "onLayout");
+        mScreenRect.set(left, top, right, bottom);
+        int captureLeft = (right - mWidth) / 2;
+        int captureTop = (bottom - mWidth) / 2;
+        int captureRight = captureLeft + mWidth;
+        int captureBottom = captureTop + mWidth;
+        mCaptureRect.set(captureLeft, captureTop, captureRight, captureBottom);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        //Log.v(TAG,"onDraw left:"+mCaptureRect.left+";top:"+mCaptureRect.top+";right:"+mCaptureRect.right+";bottom:"+mCaptureRect.bottom);
+        canvas.save();
+        //路径重新设置
+        mCapturePath.reset();
+        //添加了一个当前的矩形区域
+        mCapturePath.addRect(new RectF(mCaptureRect), Path.Direction.CW);
+        //当前的画布与指定的路径相交
+        canvas.clipPath(mCapturePath, Region.Op.INTERSECT);
+        //画矩形背景选区
+        canvas.drawRect(mScreenRect, mAreaPaint);
+        //画矩形背景边框
+        canvas.drawPath(mCapturePath, mBorderPaint);
+        canvas.restore();
+
+        //画左上锚点
+
+        mAnchorDrawable.setBounds(mCaptureRect.left - mHalfAnchorWidth, mCaptureRect.top - mHalfAnchorWidth, mCaptureRect.left + mHalfAnchorWidth, mCaptureRect.top + mHalfAnchorWidth);
+        mAnchorDrawable.draw(canvas);
+
+        //画右上锚点
+        mAnchorDrawable.setBounds(mCaptureRect.right - mHalfAnchorWidth, mCaptureRect.top - mHalfAnchorWidth, mCaptureRect.right + mHalfAnchorWidth, mCaptureRect.top + mHalfAnchorWidth);
+        mAnchorDrawable.draw(canvas);
+
+        //画右下锚点
+        mAnchorDrawable.setBounds(mCaptureRect.right - mHalfAnchorWidth, mCaptureRect.bottom - mHalfAnchorWidth, mCaptureRect.right + mHalfAnchorWidth, mCaptureRect.bottom + mHalfAnchorWidth);
+        mAnchorDrawable.draw(canvas);
+
+        //画左下锚点
+        mAnchorDrawable.setBounds(mCaptureRect.left - mHalfAnchorWidth, mCaptureRect.bottom - mHalfAnchorWidth, mCaptureRect.left + mHalfAnchorWidth, mCaptureRect.bottom + mHalfAnchorWidth);
+        mAnchorDrawable.draw(canvas);
+
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        int x = (int) event.getX();
+        int y = (int) event.getY();
+
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                mHitCorner = getHitCorner(x, y);
+                //Log.v(TAG, "ACTION_DOWN:mHitCorner" + mHitCorner);
+                //如果没有点击在锚点上，则直接返回false
+                if (mHitCorner == 0) {
+                    return false;
+                }
+                break;
+            case MotionEvent.ACTION_UP:
+                mHitCorner = 0;
+                break;
+            case MotionEvent.ACTION_MOVE:
+                if (mHitCorner == 0) {
+                    return false;
+                }
+                int dx = x - mLastX;
+                int dy = y - mLastY;
+
+                if (mHitCorner == 7) {
+                    mCaptureRect.left += dx;
+                    mCaptureRect.top += dy;
+                    //mCaptureRect.right -= dx;
+                    //mCaptureRect.bottom -= dy;
+                } else if (mHitCorner == 9) {
+                    mCaptureRect.left -= dx;
+                    mCaptureRect.top += dy;
+                    //mCaptureRect.right += dx;
+                    //mCaptureRect.bottom -= dy;
+                } else if (mHitCorner == 3) {
+
+                    //mCaptureRect.left -= dx;
+                    //mCaptureRect.top -= dy;
+                    mCaptureRect.right += dx;
+                    mCaptureRect.bottom += dy;
+                } else if (mHitCorner == 1) {
+
+                    mCaptureRect.left += dx;
+                    //mCaptureRect.top -= dy;
+                    //mCaptureRect.right -= dx;
+                    mCaptureRect.bottom += dy;
+                }
+
+                //防止选取越界
+                int screenWidth = mScreenRect.right - mScreenRect.left;
+                int screenHeight = mScreenRect.bottom - mScreenRect.top;
+                int maxWidth = screenWidth - mHalfAnchorWidth * 2;
+                if (mCaptureRect.left <= mHalfAnchorWidth) {
+                    mCaptureRect.left = mHalfAnchorWidth;
+                }
+                if (mCaptureRect.top <= mHalfAnchorWidth) {
+                    mCaptureRect.top = mHalfAnchorWidth;
+                }
+                if (mCaptureRect.right >= screenWidth - mHalfAnchorWidth) {
+                    mCaptureRect.right = screenWidth - mHalfAnchorWidth;
+                }
+                if (mCaptureRect.bottom >= screenHeight - mHalfAnchorWidth) {
+                    mCaptureRect.bottom = screenHeight - mHalfAnchorWidth;
+                }
+                if (mCaptureRect.left >= screenWidth - mHalfAnchorWidth) {
+                    mCaptureRect.left = screenWidth - mHalfAnchorWidth;
+                }
+                if (mCaptureRect.top >= screenHeight - mHalfAnchorWidth) {
+                    mCaptureRect.top = screenHeight - mHalfAnchorWidth;
+                }
+                if (mCaptureRect.right <= mHalfAnchorWidth) {
+                    mCaptureRect.right = mHalfAnchorWidth;
+                }
+                if (mCaptureRect.bottom <= mHalfAnchorWidth) {
+                    mCaptureRect.bottom = mHalfAnchorWidth;
+                }
+                boolean square = true;
+                if (Math.abs(mCaptureRect.right - mCaptureRect.left) != Math.abs(mCaptureRect.bottom - mCaptureRect.top)) {
+                    square = false;
+                }
+                Log.v(TAG, "mHitCorner" + mHitCorner + ";dx:" + dx + ";dy:" + dy + ";width:" + (mCaptureRect.right - mCaptureRect.left) + ";height:" + (mCaptureRect.bottom - mCaptureRect.top) + ";square:" + (square ? "ok" : "------------------"));
+
+
+                break;
+        }
+
+        mLastX = x;
+        mLastY = y;
+
+        invalidate();
+        return true;
+    }
+
+    public int getHitCorner(float x, float y) {
+        int result = 0;
+        if (y > mCaptureRect.top - mHalfAnchorWidth * 2 && y < mCaptureRect.top + mHalfAnchorWidth * 2) {
+            if (x > mCaptureRect.left - mHalfAnchorWidth * 2 && x < mCaptureRect.left + mHalfAnchorWidth * 2) {
+                result = 7;
+            } else if (x > mCaptureRect.right - mHalfAnchorWidth * 2 && x < mCaptureRect.right + mHalfAnchorWidth * 2) {
+                result = 9;
+            }
+        } else if (y > mCaptureRect.bottom - mHalfAnchorWidth * 2 && y < mCaptureRect.bottom + mHalfAnchorWidth * 2) {
+            if (x > mCaptureRect.left - mHalfAnchorWidth * 2 && x < mCaptureRect.left + mHalfAnchorWidth * 2) {
+                result = 1;
+            } else if (x > mCaptureRect.right - mHalfAnchorWidth * 2 && x < mCaptureRect.right + mHalfAnchorWidth * 2) {
+                result = 3;
+            }
+        }
+        return result;
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -56,5 +56,12 @@
             android:text="CricleCaptureView"
             android:textAllCaps="false"
             />
+        <Button
+            android:id="@+id/btn_rect_capture"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="RectCaptureView"
+            android:textAllCaps="false"
+            />
     </LinearLayout>
 </android.support.v4.widget.NestedScrollView>

app/src/main/res/layout/activity_rect_capture_view.xml

+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    xmlns:android="http://schemas.android.com/apk/res/android" >
+    <com.mxdl.customview.view.RectCaptureView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+</RelativeLayout>
\ No newline at end of file