content: package com.baidu.paddle.lite.demo.segmentation;
  
  import android.Manifest;
  import android.app.ProgressDialog;
  import android.content.ContentResolver;
  import android.content.Intent;
  import android.content.SharedPreferences;
  import android.content.pm.PackageManager;
  import android.database.Cursor;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.net.Uri;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.HandlerThread;
  import android.os.Message;
  import android.preference.PreferenceManager;
  import android.provider.MediaStore;
  import android.support.annotation.NonNull;
  import android.support.v4.app.ActivityCompat;
  import android.support.v4.content.ContextCompat;
  import android.support.v7.app.AppCompatActivity;
  import android.text.method.ScrollingMovementMethod;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuInflater;
  import android.view.MenuItem;
  import android.widget.ImageView;
  import android.widget.TextView;
  import android.widget.Toast;
  
  import com.baidu.paddle.lite.demo.segmentation.config.Config;
  import com.baidu.paddle.lite.demo.segmentation.preprocess.Preprocess;
  import com.baidu.paddle.lite.demo.segmentation.visual.Visualize;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  
  public class MainActivity extends AppCompatActivity {
  
      private static final String TAG = MainActivity.class.getSimpleName();
      public static final int OPEN_GALLERY_REQUEST_CODE = 0;
      public static final int TAKE_PHOTO_REQUEST_CODE = 1;
  
      public static final int REQUEST_LOAD_MODEL = 0;
      public static final int REQUEST_RUN_MODEL = 1;
      public static final int RESPONSE_LOAD_MODEL_SUCCESSED = 0;
      public static final int RESPONSE_LOAD_MODEL_FAILED = 1;
      public static final int RESPONSE_RUN_MODEL_SUCCESSED = 2;
      public static final int RESPONSE_RUN_MODEL_FAILED = 3;
  
      protected ProgressDialog pbLoadModel = null;
      protected ProgressDialog pbRunModel = null;
  
      protected Handler receiver = null; // receive messages from worker thread
      protected Handler sender = null; // send command to worker thread
      protected HandlerThread worker = null; // worker thread to load&run model
  
  
      protected TextView tvInputSetting;
      protected ImageView ivInputImage;
      protected TextView tvOutputResult;
      protected TextView tvInferenceTime;
  
      // model config
      Config config = new Config();
  
      protected Predictor predictor = new Predictor();
  
      Preprocess preprocess = new Preprocess();
  
      Visualize visualize = new Visualize();
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          receiver = new Handler() {
              @Override
              public void handleMessage(Message msg) {
                  switch (msg.what) {
                      case RESPONSE_LOAD_MODEL_SUCCESSED:
                          pbLoadModel.dismiss();
                          onLoadModelSuccessed();
                          break;
                      case RESPONSE_LOAD_MODEL_FAILED:
                          pbLoadModel.dismiss();
                          Toast.makeText(MainActivity.this, "Load model failed!", Toast.LENGTH_SHORT).show();
                          onLoadModelFailed();
                          break;
                      case RESPONSE_RUN_MODEL_SUCCESSED:
                          pbRunModel.dismiss();
                          onRunModelSuccessed();
                          break;
                      case RESPONSE_RUN_MODEL_FAILED:
                          pbRunModel.dismiss();
                          Toast.makeText(MainActivity.this, "Run model failed!", Toast.LENGTH_SHORT).show();
                          onRunModelFailed();
                          break;
                      default:
                          break;
                  }
              }
          };
  
          worker = new HandlerThread("Predictor Worker");
          worker.start();
          sender = new Handler(worker.getLooper()) {
              public void handleMessage(Message msg) {
                  switch (msg.what) {
                      case REQUEST_LOAD_MODEL:
                          // load model and reload test image
                          if (onLoadModel()) {
                              receiver.sendEmptyMessage(RESPONSE_LOAD_MODEL_SUCCESSED);
                          } else {
                              receiver.sendEmptyMessage(RESPONSE_LOAD_MODEL_FAILED);
                          }
                          break;
                      case REQUEST_RUN_MODEL:
                          // run model if model is loaded
                          if (onRunModel()) {
                              receiver.sendEmptyMessage(RESPONSE_RUN_MODEL_SUCCESSED);
                          } else {
                              receiver.sendEmptyMessage(RESPONSE_RUN_MODEL_FAILED);
                          }
                          break;
                      default:
                          break;
                  }
              }
          };
  
          tvInputSetting = findViewById(R.id.tv_input_setting);
          ivInputImage = findViewById(R.id.iv_input_image);
          tvInferenceTime = findViewById(R.id.tv_inference_time);
          tvOutputResult = findViewById(R.id.tv_output_result);
          tvInputSetting.setMovementMethod(ScrollingMovementMethod.getInstance());
          tvOutputResult.setMovementMethod(ScrollingMovementMethod.getInstance());
      }
  
  
      public boolean onLoadModel() {
          return predictor.init(MainActivity.this, config);
      }
  
  
      public boolean onRunModel() {
          return predictor.isLoaded() && predictor.runModel(preprocess,visualize);
      }
  
      public void onLoadModelFailed() {
  
      }
      public void onRunModelFailed() {
      }
  
      public void loadModel() {
          pbLoadModel = ProgressDialog.show(this, "", "Loading model...", false, false);
          sender.sendEmptyMessage(REQUEST_LOAD_MODEL);
      }
  
      public void runModel() {
          pbRunModel = ProgressDialog.show(this, "", "Running model...", false, false);
          sender.sendEmptyMessage(REQUEST_RUN_MODEL);
      }
  
      public void onLoadModelSuccessed() {
          // load test image from file_paths and run model
          try {
              if (config.imagePath.isEmpty()) {
                  return;
              }
              Bitmap image = null;
              // read test image file from custom file_paths if the first character of mode file_paths is '/', otherwise read test
              // image file from assets
              if (!config.imagePath.substring(0, 1).equals("/")) {
                  InputStream imageStream = getAssets().open(config.imagePath);
                  image = BitmapFactory.decodeStream(imageStream);
              } else {
                  if (!new File(config.imagePath).exists()) {
                      return;
                  }
                  image = BitmapFactory.decodeFile(config.imagePath);
              }
              if (image != null && predictor.isLoaded()) {
                  predictor.setInputImage(image);
                  runModel();
              }
          } catch (IOException e) {
              Toast.makeText(MainActivity.this, "Load image failed!", Toast.LENGTH_SHORT).show();
              e.printStackTrace();
          }
      }
  
      public void onRunModelSuccessed() {
          // obtain results and update UI
          tvInferenceTime.setText("Inference time: " + predictor.inferenceTime() + " ms");
          Bitmap outputImage = predictor.outputImage();
          if (outputImage != null) {
              ivInputImage.setImageBitmap(outputImage);
          }
          tvOutputResult.setText(predictor.outputResult());
          tvOutputResult.scrollTo(0, 0);
      }
  
  
      public void onImageChanged(Bitmap image) {
          // rerun model if users pick test image from gallery or camera
          if (image != null && predictor.isLoaded()) {
              predictor.setInputImage(image);
              runModel();
          }
      }
  
      public void onImageChanged(String path) {
          Bitmap image = BitmapFactory.decodeFile(path);
          predictor.setInputImage(image);
              runModel();
      }
      public void onSettingsClicked() {
          startActivity(new Intent(MainActivity.this, SettingsActivity.class));
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          MenuInflater inflater = getMenuInflater();
          inflater.inflate(R.menu.menu_action_options, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          switch (item.getItemId()) {
              case android.R.id.home:
                  finish();
                  break;
              case R.id.open_gallery:
                  if (requestAllPermissions()) {
                      openGallery();
                  }
                  break;
              case R.id.take_photo:
                  if (requestAllPermissions()) {
                      takePhoto();
                  }
                  break;
              case R.id.settings:
                  if (requestAllPermissions()) {
                      // make sure we have SDCard r&w permissions to load model from SDCard
                      onSettingsClicked();
                  }
                  break;
          }
          return super.onOptionsItemSelected(item);
      }
      @Override
      public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                             @NonNull int[] grantResults) {
          super.onRequestPermissionsResult(requestCode, permissions, grantResults);
          if (grantResults[0] != PackageManager.PERMISSION_GRANTED || grantResults[1] != PackageManager.PERMISSION_GRANTED) {
              Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
          }
      }
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
          super.onActivityResult(requestCode, resultCode, data);
          if (resultCode == RESULT_OK && data != null) {
              switch (requestCode) {
                  case OPEN_GALLERY_REQUEST_CODE:
                      try {
                          ContentResolver resolver = getContentResolver();
                          Uri uri = data.getData();
                          Bitmap image = MediaStore.Images.Media.getBitmap(resolver, uri);
                          String[] proj = {MediaStore.Images.Media.DATA};
                          Cursor cursor = managedQuery(uri, proj, null, null, null);
                          cursor.moveToFirst();
                          onImageChanged(image);
                      } catch (IOException e) {
                          Log.e(TAG, e.toString());
                      }
                      break;
  
                  case TAKE_PHOTO_REQUEST_CODE:
                      Bitmap image = (Bitmap) data.getParcelableExtra("data");
                      onImageChanged(image);
  
                      break;
                  default:
                      break;
              }
          }
      }
      private boolean requestAllPermissions() {
          if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                  != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this,
                  Manifest.permission.CAMERA)
                  != PackageManager.PERMISSION_GRANTED) {
              ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,
                              Manifest.permission.CAMERA},
                      0);
              return false;
          }
          return true;
      }
  
      private void openGallery() {
          Intent intent = new Intent(Intent.ACTION_PICK, null);
          intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
          startActivityForResult(intent, OPEN_GALLERY_REQUEST_CODE);
      }
  
      private void takePhoto() {
          Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
          if (takePhotoIntent.resolveActivity(getPackageManager()) != null) {
              startActivityForResult(takePhotoIntent, TAKE_PHOTO_REQUEST_CODE);
          }
      }
  
      @Override
      public boolean onPrepareOptionsMenu(Menu menu) {
          boolean isLoaded = predictor.isLoaded();
          menu.findItem(R.id.open_gallery).setEnabled(isLoaded);
          menu.findItem(R.id.take_photo).setEnabled(isLoaded);
          return super.onPrepareOptionsMenu(menu);
      }
  
      @Override
      protected void onResume() {
          Log.i(TAG,"begin onResume");
          super.onResume();
  
          SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
          boolean settingsChanged = false;
          String model_path = sharedPreferences.getString(getString(R.string.MODEL_PATH_KEY),
                  getString(R.string.MODEL_PATH_DEFAULT));
          String label_path = sharedPreferences.getString(getString(R.string.LABEL_PATH_KEY),
                  getString(R.string.LABEL_PATH_DEFAULT));
          String image_path = sharedPreferences.getString(getString(R.string.IMAGE_PATH_KEY),
                  getString(R.string.IMAGE_PATH_DEFAULT));
          settingsChanged |= !model_path.equalsIgnoreCase(config.modelPath);
          settingsChanged |= !label_path.equalsIgnoreCase(config.labelPath);
          settingsChanged |= !image_path.equalsIgnoreCase(config.imagePath);
          int cpu_thread_num = Integer.parseInt(sharedPreferences.getString(getString(R.string.CPU_THREAD_NUM_KEY),
                  getString(R.string.CPU_THREAD_NUM_DEFAULT)));
          settingsChanged |= cpu_thread_num != config.cpuThreadNum;
          String cpu_power_mode =
                  sharedPreferences.getString(getString(R.string.CPU_POWER_MODE_KEY),
                          getString(R.string.CPU_POWER_MODE_DEFAULT));
          settingsChanged |= !cpu_power_mode.equalsIgnoreCase(config.cpuPowerMode);
          String input_color_format =
                  sharedPreferences.getString(getString(R.string.INPUT_COLOR_FORMAT_KEY),
                          getString(R.string.INPUT_COLOR_FORMAT_DEFAULT));
          settingsChanged |= !input_color_format.equalsIgnoreCase(config.inputColorFormat);
          long[] input_shape =
                  Utils.parseLongsFromString(sharedPreferences.getString(getString(R.string.INPUT_SHAPE_KEY),
                          getString(R.string.INPUT_SHAPE_DEFAULT)), ",");
  
          settingsChanged |= input_shape.length != config.inputShape.length;
  
          if (!settingsChanged) {
              for (int i = 0; i < input_shape.length; i++) {
                  settingsChanged |= input_shape[i] != config.inputShape[i];
              }
          }
  
          if (settingsChanged) {
              config.init(model_path,label_path,image_path,cpu_thread_num,cpu_power_mode,
                      input_color_format,input_shape);
              preprocess.init(config);
              // update UI
              tvInputSetting.setText("Model: " + config.modelPath.substring(config.modelPath.lastIndexOf("/") + 1) + "\n" + "CPU" +
                      " Thread Num: " + Integer.toString(config.cpuThreadNum) + "\n" + "CPU Power Mode: " + config.cpuPowerMode);
              tvInputSetting.scrollTo(0, 0);
              // reload model if configure has been changed
              loadModel();
          }
      }
  
      @Override
      protected void onDestroy() {
          if (predictor != null) {
              predictor.releaseModel();
          }
          worker.quit();
          super.onDestroy();
      }
  }
  