Android 实现拍照 和拉起相册库（带裁剪照片功能）

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".MainActivity">


    <ImageView
        android:id="@+id/iv"
        android:layout_width="200dp"
        android:layout_height="200dp" />

    <Button
        android:id="@+id/btn_takephoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="拍照" />

    <Button
        android:id="@+id/btn_open_photo_album"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="相册库" />

</LinearLayout>

MainActivity

private static final String TAG = "MainActivity";
private static final int REQUEST_TAKE_PHOTO = 0;// 拍照
private static final int REQUEST_CROP = 1;// 裁剪
private static final int SCAN_OPEN_PHONE = 2;// 相册
private static final int REQUEST_PERMISSION = 100;
private ImageView img;
private Uri imgUri; // 拍照时返回的uri
private Uri mCutUri;// 图片裁剪时返回的uri
private File imgFile;// 拍照保存的图片文件
private boolean hasPermission = false;

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

    findViewById(R.id.btn_takephoto).setOnClickListener(this);
    findViewById(R.id.btn_open_photo_album).setOnClickListener(this);
    img = findViewById(R.id.iv);

    checkPermissions();
}

private void checkPermissions() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        // 检查是否有存储和拍照权限
        if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
                && checkSelfPermission(Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED
        ) {
            hasPermission = true;
        } else {
            requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA}, REQUEST_PERMISSION);
        }
    }
}

@Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.btn_takephoto:
            if (hasPermission) {
                takePhone();
            }
            break;

        case R.id.btn_open_photo_album:
            if (hasPermission) {
                openGallery();
            }

            break;
    }
}

// 拍照
private void takePhone() {
    // 要保存的文件名
    String time = new SimpleDateFormat("yyyyMMddHHmmss", Locale.CHINA).format(new Date());
    String fileName = "photo_" + time;
    // 创建一个文件夹
    String path = Environment.getExternalStorageDirectory() + "/take_photo";
    File file = new File(path);
    if (!file.exists()) {
        file.mkdirs();
    }
    // 要保存的图片文件
    imgFile = new File(file, fileName + ".jpeg");
    // 将file转换成uri
    // 注意7.0及以上与之前获取的uri不一样了，返回的是provider路径
    imgUri = getUriForFile(this, imgFile);
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // 添加Uri读取权限
    intent.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);
    // 或者
    grantUriPermission("com.rain.takephotodemo", imgUri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
    // 添加图片保存位置
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);
    startActivityForResult(intent, REQUEST_TAKE_PHOTO);
}

//相册库
private void openGallery() {
    Intent intent = new Intent(Intent.ACTION_PICK);
    intent.setType("image/*");
    startActivityForResult(intent, SCAN_OPEN_PHONE);
}

// 从file中获取uri
// 7.0及以上使用的uri是contentProvider content://com.rain.takephotodemo.FileProvider/images/photo_20180824173621.jpg
// 6.0使用的uri为file:///storage/emulated/0/take_photo/photo_20180824171132.jpg
private static Uri getUriForFile(Context context, File file) {
    if (context == null || file == null) {
        throw new NullPointerException();
    }
    Uri uri;
    if (Build.VERSION.SDK_INT >= 24) {
        uri = FileProvider.getUriForFile(context.getApplicationContext(), "com.example.myapplication.FileProvider", file);
    } else {
        uri = Uri.fromFile(file);
    }
    return uri;
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_PERMISSION) {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            hasPermission = true;
        } else {
            Toast.makeText(this, "权限授予失败！", Toast.LENGTH_SHORT).show();
            hasPermission = false;
        }
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK) {
        switch (requestCode) {
            // 拍照并进行裁剪
            case REQUEST_TAKE_PHOTO:
                Log.e(TAG, "拍照并进行裁剪:" + imgUri.toString());
                cropPhoto(imgUri, true);
                break;

            // 裁剪后设置图片
            case REQUEST_CROP:
                img.setImageURI(mCutUri);
                Log.e(TAG, "裁剪后设置图片:REQUEST_CROP:" + mCutUri.toString());
                break;
            // 打开图库获取图片并进行裁剪
            case SCAN_OPEN_PHONE:
                Log.e(TAG, "打开图库获取图片并进行裁剪:" + data.getData().toString());
                cropPhoto(data.getData(), false);
                break;
        }
    }
}

 // 图片裁剪
    private void cropPhoto(Uri uri, boolean fromCapture) {
        Intent intent = new Intent("com.android.camera.action.CROP"); //打开系统自带的裁剪图片的intent


        // 注意一定要添加该项权限，否则会提示无法裁剪
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

        intent.setDataAndType(uri, "image/*");
        intent.putExtra("scale", true);

        // 设置裁剪区域的宽高比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);

        // 设置裁剪区域的宽度和高度
        intent.putExtra("outputX", 200);
        intent.putExtra("outputY", 200);

        // 取消人脸识别
        intent.putExtra("noFaceDetection", true);
        // 图片输出格式
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());

        // 若为false则表示不返回数据
        intent.putExtra("return-data", false);

        // 指定裁剪完成以后的图片所保存的位置,pic info显示有延时
        if (fromCapture) {
            // 如果是使用拍照，那么原先的uri和最终目标的uri一致,注意这里的uri必须是Uri.fromFile生成的
            mCutUri = Uri.fromFile(imgFile);
        } else { // 从相册中选择，那么裁剪的图片保存在take_photo中
            String time = new SimpleDateFormat("yyyyMMddHHmmss", Locale.CHINA).format(new Date());
            String fileName = "photo_" + time;
            File mCutFile = new File(Environment.getExternalStorageDirectory() + "/take_photo", fileName + ".jpeg");
            if (!mCutFile.getParentFile().exists()) {
                mCutFile.getParentFile().mkdirs();
            }
            mCutUri = Uri.fromFile(mCutFile);
        }
        intent.putExtra(MediaStore.EXTRA_OUTPUT, mCutUri);
//        Toast.makeText(this, "剪裁图片", Toast.LENGTH_SHORT).show();
        // 以广播方式刷新系统相册，以便能够在相册中找到刚刚所拍摄和裁剪的照片
        Intent intentBc = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        intentBc.setData(uri);
        this.sendBroadcast(intentBc);

        startActivityForResult(intent, REQUEST_CROP); //设置裁剪参数显示图片至ImageVie
    }

xml

public_file_path

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <external-path
        name="images"
        path="take_photo/"/>
</resources>

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="com.example.myapplication.FileProvider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/public_file_path" />
</provider>

权限

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

以上就是全部内容，希望对你开发有所帮助！！

本文地址：https://blog.csdn.net/shuai497331206/article/details/107908502