Write Image for android

BluetoothSerialExample/.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>BluetoothSerialExample</name>
+	<comment>Project BluetoothSerialExample created by Buildship.</comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
+	</natures>
+</projectDescription>

BluetoothSerialExample/.settings/org.eclipse.buildship.core.prefs

@@ -0,0 +1,2 @@
+connection.project.dir=
+eclipse.preferences.version=1

android/.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>android</name>
+	<comment>Project android created by Buildship.</comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
+	</natures>
+</projectDescription>

android/.settings/org.eclipse.buildship.core.prefs

@@ -0,0 +1,2 @@
+connection.project.dir=
+eclipse.preferences.version=1

android/build.gradle

@@ -35,4 +35,5 @@ repositories {
 
 dependencies {
     compile 'com.facebook.react:react-native:+'
+    compile files('libs/btsdk.jar')
 }

android/src/main/java/com/rusel/RCTBluetoothSerial/RCTBluetoothSerialModule.java

@@ -15,6 +15,12 @@
 import android.util.Log;
 import android.util.Base64;
 
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+
+import java.io.ByteArrayOutputStream;
+import zj.com.customize.sdk.Other;
+
 import com.facebook.react.bridge.ActivityEventListener;
 import com.facebook.react.bridge.LifecycleEventListener;
 import com.facebook.react.bridge.ReactApplicationContext;
@@ -24,6 +30,7 @@
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.bridge.WritableArray;
 import com.facebook.react.bridge.Promise;
+import com.facebook.react.bridge.Callback;
 import com.facebook.react.modules.core.DeviceEventManagerModule;
 
 import static com.rusel.RCTBluetoothSerial.RCTBluetoothSerialPackage.TAG;
@@ -91,6 +98,49 @@ public String getName() {
         return "RCTBluetoothSerial";
     }
 
+    private Bitmap base64ToBitmap(String b64) {
+        byte[] imageAsBytes = Base64.decode(b64.getBytes(), Base64.DEFAULT);
+        return BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length);
+        }
+
+    private String bitmapToBase64(Bitmap bitmap) {
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
+        byte[] byteArray = byteArrayOutputStream .toByteArray();
+        return Base64.encodeToString(byteArray, Base64.DEFAULT);
+    }
+
+    @ReactMethod
+    /**
+     * Write to device over serial port
+     */
+    public void write_img(String imgB64, Promise promise) {
+        String encodeIMG = imgB64;
+        String base64Image = encodeIMG.split(",")[1];
+        Bitmap bmp = base64ToBitmap(base64Image);
+        String encodedImage = bitmapToBase64(bmp);
+        //---------------------------------------------------
+        byte[] data = POS_PrintBMP(bmp, 384, 0);  // --- PRINT IMG FROM BITMAP
+        //---------------------------------------------------
+        mBluetoothService.write(data);
+        promise.resolve(true);
+        // callback.invoke(true);
+    }
+
+    public static byte[] POS_PrintBMP(Bitmap mBitmap, int nWidth, int nMode) {
+        int width = (nWidth + 7) / 8 * 8;
+        int height = mBitmap.getHeight() * width / mBitmap.getWidth();
+        height = (height + 7) / 8 * 8;
+        Bitmap rszBitmap = mBitmap;
+        if(mBitmap.getWidth() != width) {
+            rszBitmap = Other.resizeImage(mBitmap, width, height);
+        }
+        Bitmap grayBitmap = Other.toGrayscale(rszBitmap);
+        byte[] dithered = Other.thresholdToBWPic(grayBitmap);
+        byte[] data = Other.eachLinePixToCmd(dithered, width, nMode);
+        return data;
+    }
+
     @Override
     public void onActivityResult(Activity activity, int requestCode, int resultCode, Intent intent) {
         if (D) Log.d(TAG, "On activity result request: " + requestCode + ", result: " + resultCode);