android使用相机和相册简单教程

第一步：加权限和依赖glide图片加载框架

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

implementation 'com.github.bumptech.glide:glide:4.7.1'

第二步：

创建工具类

public class PhotoUtil {
    /**
     * 开始拍照
     * @param activity
     * @param requestCode
     * @return
     */
    public static String start_camera(Activity activity, int requestCode) {
        Uri imageUri;
        // save image in cache path
        File outputImage = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                + "/lite_mobile/"+System.currentTimeMillis() + ".jpg");
        Log.d("outputImage", outputImage.getAbsolutePath());
        try {
            if (outputImage.exists()) {
                outputImage.delete();
            }
            File out_path = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                    + "/lite_mobile/");
            if (!out_path.exists()) {
                out_path.mkdirs();
            }
            outputImage.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (Build.VERSION.SDK_INT >= 24) {
            // compatible with Android 7.0 or over
            imageUri = FileProvider.getUriForFile(activity,
                    "com.ych.testtflite.fileprovider", outputImage);
        } else {
            imageUri = Uri.fromFile(outputImage);
        }
        // set system camera Action
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        // set save photo path
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        // set photo quality, min is 0, max is 1
        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
        activity.startActivityForResult(intent, requestCode);
        // return image absolute path
        return outputImage.getAbsolutePath();
    }

    /**
     * 相册选择
     * @param activity
     * @param requestCode
     */
    public static void use_photo(Activity activity, int requestCode) {
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        activity.startActivityForResult(intent, requestCode);
    }
}

第三步：

创建main_activity.xml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:orientation="vertical"
    tools:context="ych.com.camerademo.MainActivity">

  <ImageView
      android:layout_width="match_parent"
      android:layout_height="0dp"
      android:layout_weight="1"
      android:id="@+id/show_image"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="相机"
        android:id="@+id/btn_camera"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="相册"
        android:id="@+id/btn_album"/>

</LinearLayout>

第四步：创建MainActivity.java

public class MainActivity extends AppCompatActivity {
    private static final String TAG = MainActivity.class.getName();
    private static final int USE_PHOTO = 1001;
    private static final int START_CAMERA = 1002;

    private ImageView show_image;
    private Button btn_camera;
    private Button btn_album;
    private String camera_image_path;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        show_image=findViewById(R.id.show_image);
        btn_camera=findViewById(R.id.btn_camera);
        btn_album=findViewById(R.id.btn_album);
        request_permissions();

        btn_album.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PhotoUtil.use_photo(MainActivity.this, USE_PHOTO);
            }
        });
        btn_camera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                camera_image_path = PhotoUtil.start_camera(MainActivity.this, START_CAMERA);
            }
        });
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        String image_path;
        RequestOptions options = new RequestOptions().skipMemoryCache(true).diskCacheStrategy(DiskCacheStrategy.NONE);
        if (resultCode == Activity.RESULT_OK) {
            switch (requestCode) {
                case USE_PHOTO:
                    if (data == null||options==null) {
                        Log.w(TAG, "user photo data is null");
                        return;
                    }
                    Log.e("data",data.getData().getPath());
                    Uri image_uri = data.getData();
                    Glide.with(MainActivity.this).load(image_uri).apply(options).into(show_image);
                    // get image path from uri
                    //image_path = PhotoUtil.get_path_from_URI(MainActivity.this, image_uri);
                    // predict image
                    //predict_image(image_path);
                    break;
                case START_CAMERA:
                    // show photo
                    Log.e("path",camera_image_path);
                    Log.e("options",options+"[]");
                    Glide.with(MainActivity.this).load(new File(camera_image_path)).apply(options).into(show_image);
                    // predict image
                    //predict_image(camera_image_path);
                    break;
            }
        }
    }
    // request permissions
    private void request_permissions() {

        List<String> permissionList = new ArrayList<>();
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.CAMERA);
        }

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.READ_EXTERNAL_STORAGE);
        }

        // if list is not empty will request permissions
        if (!permissionList.isEmpty()) {
            ActivityCompat.requestPermissions(this, permissionList.toArray(new String[permissionList.size()]), 1);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0) {
                    for (int i = 0; i < grantResults.length; i++) {

                        int grantResult = grantResults[i];
                        if (grantResult == PackageManager.PERMISSION_DENIED) {
                            String s = permissions[i];
                            Toast.makeText(this, s + " permission was denied", Toast.LENGTH_SHORT).show();
                        }
                    }
                }
                break;
        }
    }

}

第五步：

android7.0以上访问路径配置：需要注册provider

<!-- FileProvider配置访问路径，适配7.0及其以上 -->
<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="com.ych.testtflite.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths"/>
</provider>

第六步：创建file_paths.xml文件，在res中创建一个xml文件夹，将该文件放入

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

android使用相机和相册简单教程

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