newFny/app/src/main/java/com/qingdaofushan/home/activity/CamActivity.java

package com.qingdaofushan.home.activity;

import android.Manifest;
import android.content.ContentValues;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.icu.text.SimpleDateFormat;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.core.content.FileProvider;
import androidx.core.os.EnvironmentCompat;

import com.qingdaofushan.home.R;
import com.qingdaofushan.home.utils.Uri2PathUtil;

import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.Locale;

public class CamActivity extends AppCompatActivity {

//    private ImageView ivCamera;
//    private ImageView ivPhoto;

    // 拍照的requestCode
    private static final int CAMERA_REQUEST_CODE = 0x00000010;
    // 申请相机权限的requestCode
    private static final int PERMISSION_CAMERA_REQUEST_CODE = 0x00000012;
    /**
     * 用于保存拍照图片的uri
     */
    private Uri mCameraUri;

    /**
     * 用于保存图片的文件路径，Android 10以下使用图片路径访问图片
     */
    private String mCameraImagePath;

    /**
     * 是否是Android 10以上手机
     */
    private boolean isAndroidQ = Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q;

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

    /**
     * 检查权限并拍照。
     * 调用相机前先检查权限。
     */
    private void checkPermissionAndCamera() {
        int hasCameraPermission = ContextCompat.checkSelfPermission(getApplication(),
                Manifest.permission.CAMERA);
        if (hasCameraPermission == PackageManager.PERMISSION_GRANTED) {
            //有权限，调起相机拍照。
            openCamera();
        } else {
            //没有权限，申请权限。
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
                    PERMISSION_CAMERA_REQUEST_CODE);
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    PERMISSION_CAMERA_REQUEST_CODE);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        System.out.println("==================resultCode = " + resultCode);
        if (requestCode == CAMERA_REQUEST_CODE) {
            if (resultCode == RESULT_OK) {
                String uploadpath = Uri2PathUtil.getRealPathFromUri(this, mCameraUri);
                Log.e("pwx", "onActivityResult: " + uploadpath);

                finish();
//                ivPhoto.setImageURI(mCameraUri);
            } else {
                Toast.makeText(this, "取消", Toast.LENGTH_LONG).show();
            }
        }
    }

    /**
     * 处理权限申请的回调。
     *
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == PERMISSION_CAMERA_REQUEST_CODE) {
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                //允许权限，有调起相机拍照。
                openCamera();
            } else {
                //拒绝权限，弹出提示框。
                Toast.makeText(this, "拍照权限被拒绝", Toast.LENGTH_LONG).show();
            }
        }
    }

    /**
     * 调起相机拍照
     */
    private void openCamera() {
        Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // 判断是否有相机
        if (captureIntent.resolveActivity(getPackageManager()) != null) {
            File photoFile = null;
            Uri photoUri = null;

            if (isAndroidQ) {
                // 适配android 10
                photoUri = createImageUri();
            } else {
                try {
                    photoFile = createImageFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                if (photoFile != null) {
                    mCameraImagePath = photoFile.getAbsolutePath();
                    System.out.println("path = " + mCameraImagePath);
                    photoUri = FileProvider.getUriForFile(CamActivity.this,
                            "com.qingdaofushan.home.fileprovider", photoFile);
                }
            }

            System.out.println("photoUri = " + photoUri);
            mCameraUri = photoUri;
            if (photoUri != null) {
                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
                    List<ResolveInfo> resInfoList = getPackageManager()
                            .queryIntentActivities(captureIntent, PackageManager.MATCH_DEFAULT_ONLY);
                    for (ResolveInfo resolveInfo : resInfoList) {
                        String packageName = resolveInfo.activityInfo.packageName;
                        grantUriPermission(packageName, photoUri,
                                Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    }
                }
                captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
                captureIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                startActivityForResult(captureIntent, CAMERA_REQUEST_CODE);
            }
        }
    }

    /**
     * 创建图片地址uri,用于保存拍照后的照片 Android 10以后使用这种方法
     *
     * @return 图片的uri
     */
    private Uri createImageUri() {
        //设置保存参数到ContentValues中
        ContentValues contentValues = new ContentValues();
        //设置文件名
        contentValues.put(MediaStore.Images.Media.DISPLAY_NAME, System.currentTimeMillis() + "");
        //兼容Android Q和以下版本
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            //android Q中不再使用DATA字段，而用RELATIVE_PATH代替
            //TODO RELATIVE_PATH是相对路径不是绝对路径;照片存储的地方为：内部存储/Pictures/preventpro
            contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, "Pictures/preventpro");
        }
        //设置文件类型
        contentValues.put(MediaStore.Images.Media.MIME_TYPE, "image/JPEG");
        //执行insert操作，向系统文件夹中添加文件
        //EXTERNAL_CONTENT_URI代表外部存储器，该值不变
        Uri uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
        return uri;

    }

    /**
     * 创建保存图片的文件
     *
     * @return
     * @throws IOException
     */
    private File createImageFile() throws IOException {
        String imageName = new SimpleDateFormat("yyyyMMdd_HHmmss",
                Locale.getDefault()).format(new Date()) + ".jpg";
//        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
//        File storageDir = Environment.getExternalStoragePublicDirectory(
//                Environment.DIRECTORY_PICTURES);
        File storageDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator + "Pictures" + File.separator + "abc");
        if (!storageDir.exists()) storageDir.mkdirs();

        File tempFile = new File(storageDir, imageName);
        if (!Environment.MEDIA_MOUNTED.equals(EnvironmentCompat.getStorageState(tempFile))) {
            return null;
        }
        return tempFile;
    }


}