Android studio 拍照功能详细教程

好的，关于Android Studio的拍照功能，以下是详细的教程：

1. 打开Android Studio并创建一个新项目
2. 在项目中打开并编辑 activity_main.xml 文件
3. 添加一个ImageView组件和一个Button组件到布局文件中，如下所示：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
 
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop" />
 
    <Button
        android:id="@+id/buttonCapture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:text="Capture" />
 
</RelativeLayout>

4. 在MainActivity.java文件中实现拍照功能。首先，声明一个全局的变量mImageUri来保存拍摄照片的Uri

private Uri mImageUri;

5. 添加以下代码用于按钮点击事件处理：

Button b_photo = findViewById(R.id.buttonCapture);
ImageView iv_photo = findViewById(R.id.imageView);
 
b_photo.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        mImageUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image
        intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri); // set the image file name
        startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE); // start the image capture intent
    }
});

6. 添加以下代码将拍摄的照片显示在ImageView组件上：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // check if the result is ok
    if (resultCode == RESULT_OK) {
        // Image captured and saved to mImageUri
        iv_photo.setImageURI(mImageUri);
    } else {
        // User cancelled the image capture
        Toast.makeText(this, "Cancelled", Toast.LENGTH_LONG).show();
    }
}

7. 最后添加以下代码来创建一个保存照片的文件：

private static final int MEDIA_TYPE_IMAGE = 1;
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
private static final String IMAGE_DIRECTORY_NAME = "MyApp";
 
private Uri getOutputMediaFileUri(int type) {
    return Uri.fromFile(getOutputMediaFile(type));
}
 
private File getOutputMediaFile(int type) {
    // External sdcard location
    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), IMAGE_DIRECTORY_NAME);
    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create " + IMAGE_DIRECTORY_NAME + " directory");
            return null;
        }
    }
    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
    } else {
        return null;
    }
    return mediaFile;
}

好了，以上就是详细的Android Studio拍照功能教程，希望对你有所帮助。