调用摄像头拍照

大致流程：调用相机拍照，然后剪辑，之后再在imageView中显示。项目结构如下：

一、一些初始化的代码：

public static final int TAKE_PHOTO = 1;
public static final int CROP_PHOTO = 2;
public static final int CHOOSE_PHOTO = 3;
private ImageView picture;
private Uri imageUri;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    picture = (ImageView) findViewById(R.id.picture);
}

二、创建文件：

// 创建File对象，用于存储拍照后的图片
private File createImageFile(String fileName) {
    File outputImage = new File(Environment.getExternalStorageDirectory(), fileName);
    try {
        if (outputImage.exists()) {
            outputImage.delete();
        }
        outputImage.createNewFile();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return outputImage;
}

三、调用系统相机拍照，

// 调用系统相机拍照，并创建一张jpg文件
public void takePhone(View view) {
    imageUri = Uri.fromFile(createImageFile("takephone.jpg"));
    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    startActivityForResult(intent, TAKE_PHOTO); // 启动相机程序
}

四、 onActivityResult方法：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case TAKE_PHOTO:
            phoneTake(resultCode);
            break;
        case CROP_PHOTO:
            phoneCrop(resultCode);
            break;
        case CHOOSE_PHOTO:
            phoneChoose(resultCode, data);
            break;
        default:
            break;
    }
}

五、 phoneTake方法：

// 拍照的回调
private void phoneTake(int resultCode) {
    if (resultCode == RESULT_OK) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(imageUri, "image/*");
        intent.putExtra("scale", true);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        startActivityForResult(intent, CROP_PHOTO); // 启动裁剪程序
    }
}

六、 phoneCrop方法，裁剪的回调

// 裁剪的回调
private void phoneCrop(int resultCode) {
    if (resultCode == RESULT_OK) {
        try {
            BufferedInputStream inputStream = new BufferedInputStream(getContentResolver().openInputStream(imageUri));
            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
            picture.setImageBitmap(bitmap); // 将裁剪后的照片显示出来
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

七、声明权限：

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

从相册中选择照片

一、从相册中选择照片：

// 从相册中选择照片：
public void choosePhone(View view) {
    imageUri = Uri.fromFile(createImageFile("choosephone.jpg"));
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.setType("image/*");
    intent.putExtra("crop", true);
    intent.putExtra("scale", true);
    startActivityForResult(intent, CHOOSE_PHOTO);
}

二、从相册中选取图片，再显示

// 从相册中选取图片，再显示
private void phoneChoose(int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        ContentResolver resolver = getContentResolver();
        Uri originalUri = data.getData();
        try {
            Bitmap photo = MediaStore.Images.Media.getBitmap(resolver, originalUri);
            if (photo != null) {
                picture.setImageBitmap(photo);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

android基础---->摄像头与相册的调用

调用摄像头拍照

从相册中选择照片

友情链接