lite-model_movenet_singlepose_lightning_tflite_int8_4.tflite详细的部署在安卓上的代码，测试一张图片

部署 MoveNet SinglePose Lightning 模型在 Android 上需要以下步骤：

1. 将模型转换为 Tensorflow Lite 格式并下载模型文件 `lite-model_movenet_singlepose_lightning_tflite_int8_4.tflite`。

2. 在 Android Studio 中创建一个新项目，并添加以下依赖项：

implementation 'org.tensorflow:tensorflow-lite:2.5.0'
implementation 'org.tensorflow:tensorflow-lite-gpu:2.5.0'

3. 将模型文件放入 Android 项目的 `assets` 目录下。

4. 加载模型文件并初始化解释器：

// 加载模型文件
AssetFileDescriptor assetFileDescriptor = getAssets().openFd("lite-model_movenet_singlepose_lightning_tflite_int8_4.tflite");
FileInputStream inputStream = new FileInputStream(assetFileDescriptor.getFileDescriptor());
FileChannel fileChannel = inputStream.getChannel();
long startOffset = assetFileDescriptor.getStartOffset();
long declaredLength = assetFileDescriptor.getDeclaredLength();
MappedByteBuffer modelBuffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);

// 初始化解释器
Interpreter.Options options = new Interpreter.Options();
GpuDelegate delegate = new GpuDelegate();
options.addDelegate(delegate);
Interpreter interpreter = new Interpreter(modelBuffer, options);

5. 加载图片并预处理，将其转换为模型所需的输入格式：

// 加载图片
Bitmap bitmap = BitmapFactory.decodeStream(getAssets().open("test_image.png"));

// 缩放图片
int inputSize = 256;
Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, inputSize, inputSize, true);

// 将图片转换为 Tensor
float[][][][] inputTensor = new float[1][inputSize][inputSize][3];
for (int i = 0; i < inputSize; i++) {
    for (int j = 0; j < inputSize; j++) {
        int pixel = resizedBitmap.getPixel(j, i);
        inputTensor[0][i][j][0] = (float) ((pixel >> 16) & 0xFF) / 255.0f;
        inputTensor[0][i][j][1] = (float) ((pixel >> 8) & 0xFF) / 255.0f;
        inputTensor[0][i][j][2] = (float) (pixel & 0xFF) / 255.0f;
    }
}

// 创建输入 Tensor
int[] inputShape = interpreter.getInputTensor(0).shape();
DataType inputDataType = interpreter.getInputTensor(0).dataType();
Tensor inputTensorBuffer = Tensor.fromBuffer(inputTensor, inputDataType, inputShape);

6. 运行模型并获取输出：

// 运行模型
Map<Integer, Object> outputMap = new HashMap<>();
int[] outputShape = interpreter.getOutputTensor(0).shape();
DataType outputDataType = interpreter.getOutputTensor(0).dataType();
Tensor outputTensorBuffer = Tensor.allocate(outputDataType, outputShape);
outputMap.put(0, outputTensorBuffer);
interpreter.runForMultipleInputsOutputs(new Object[]{inputTensorBuffer}, outputMap);

// 获取关键点坐标
float[][][] outputTensor = new float[1][17][3];
outputTensorBuffer.copyTo(outputTensor);
float[][] keypoints = outputTensor[0];

7. 使用获取的关键点坐标绘制姿势：

// 绘制姿势
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setStrokeWidth(10);
for (int i = 0; i < keypoints.length; i++) {
    float x = keypoints[i][1] * bitmap.getWidth();
    float y = keypoints[i][0] * bitmap.getHeight();
    canvas.drawPoint(x, y, paint);
}
imageView.setImageBitmap(bitmap);

完整代码如下：

import android.content.res.AssetFileDescriptor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;

import androidx.appcompat.app.AppCompatActivity;

import org.tensorflow.lite.DataType;
import org.tensorflow.lite.Interpreter;
import org.tensorflow.lite.gpu.GpuDelegate;
import org.tensorflow.lite.support.tensorbuffer.TensorBuffer;
import org.tensorflow.lite.support.tensorbuffer.TensorBufferFloat;

import java.io.FileInputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MoveNetDemo";

    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView = findViewById(R.id.imageView);

        try {
            // 加载模型文件
            AssetFileDescriptor assetFileDescriptor = getAssets().openFd("lite-model_movenet_singlepose_lightning_tflite_int8_4.tflite");
            FileInputStream inputStream = new FileInputStream(assetFileDescriptor.getFileDescriptor());
            FileChannel fileChannel = inputStream.getChannel();
            long startOffset = assetFileDescriptor.getStartOffset();
            long declaredLength = assetFileDescriptor.getDeclaredLength();
            MappedByteBuffer modelBuffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, startOffset, declaredLength);

            // 初始化解释器
            Interpreter.Options options = new Interpreter.Options();
            GpuDelegate delegate = new GpuDelegate();
            options.addDelegate(delegate);
            Interpreter interpreter = new Interpreter(modelBuffer, options);

            // 加载图片
            Bitmap bitmap = BitmapFactory.decodeStream(getAssets().open("test_image.png"));

            // 缩放图片
            int inputSize = 256;
            Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, inputSize, inputSize, true);

            // 将图片转换为 Tensor
            float[][][][] inputTensor = new float[1][inputSize][inputSize][3];
            for (int i = 0; i < inputSize; i++) {
                for (int j = 0; j < inputSize; j++) {
                    int pixel = resizedBitmap.getPixel(j, i);
                    inputTensor[0][i][j][0] = (float) ((pixel >> 16) & 0xFF) / 255.0f;
                    inputTensor[0][i][j][1] = (float) ((pixel >> 8) & 0xFF) / 255.0f;
                    inputTensor[0][i][j][2] = (float) (pixel & 0xFF) / 255.0f;
                }
            }

            // 创建输入 Tensor
            int[] inputShape = interpreter.getInputTensor(0).shape();
            DataType inputDataType = interpreter.getInputTensor(0).dataType();
            Tensor inputTensorBuffer = Tensor.fromBuffer(inputTensor, inputDataType, inputShape);

            // 运行模型
            Map<Integer, Object> outputMap = new HashMap<>();
            int[] outputShape = interpreter.getOutputTensor(0).shape();
            DataType outputDataType = interpreter.getOutputTensor(0).dataType();
            Tensor outputTensorBuffer = Tensor.allocate(outputDataType, outputShape);
            outputMap.put(0, outputTensorBuffer);
            interpreter.runForMultipleInputsOutputs(new Object[]{inputTensorBuffer}, outputMap);

            // 获取关键点坐标
            float[][][] outputTensor = new float[1][17][3];
            outputTensorBuffer.copyTo(outputTensor);
            float[][] keypoints = outputTensor[0];

            // 绘制姿势
            Canvas canvas = new Canvas(bitmap);
            Paint paint = new Paint();
            paint.setColor(Color.RED);
            paint.setStrokeWidth(10);
            for (int i = 0; i < keypoints.length; i++) {
                float x = keypoints[i][1] * bitmap.getWidth();
                float y = keypoints[i][0] * bitmap.getHeight();
                canvas.drawPoint(x, y, paint);
            }
            imageView.setImageBitmap(bitmap);

        } catch (Exception e) {
            Log.e(TAG, "Error", e);
        }
    }
}

在 `assets` 目录下添加一张名为 `test_image.png` 的测试图片，运行应用程序即可看到绘制的姿势。