import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.PersistableBundle;
import android.provider.MediaStore;
import android.support.annotation.Nullable;

import com.vm.shadowsocks.utils.MakeFile;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 拍照
 */

public class photoActivity extends Activity {
    private static Uri imageUri;
    public static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
    public static File tempFile;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
        
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case PHOTO_REQUEST_CAREMA:
                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);
                }
                break;
        }
    }
    public static void openCamera(Activity activity) {
        //獲取系統版本
        int currentapiVersion = android.os.Build.VERSION.SDK_INT;
        // 啟用相機
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // 判斷儲存卡是否可以用，可用進行儲存
        if (hasSdcard()) {
            SimpleDateFormat timeStampFormat = new SimpleDateFormat(
                    "yyyy_MM_dd_HH_mm_ss");
            String filename = timeStampFormat.format(new Date());
            MakeFile.makeRootDirectory(Environment.getExternalStorageDirectory().getPath()+ "/Android/photo");
            tempFile = new File(Environment.getExternalStorageDirectory().getPath()+ "/Android/photo",
                    filename + ".jpg");
            if (currentapiVersion < 24) {
                // 從檔案中建立uri
                imageUri = Uri.fromFile(tempFile);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            } else {
                //相容android7.0 使用共享檔案的形式
                ContentValues contentValues = new ContentValues(1);
                contentValues.put(MediaStore.Images.Media.DATA, tempFile.getAbsolutePath());
//                //檢查是否有儲存許可權，以免崩潰
//                if (ContextCompat.checkSelfPermission(photoActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
//                        != PackageManager.PERMISSION_GRANTED) {
//                    //申請WRITE_EXTERNAL_STORAGE許可權
////                    Toast.makeText(this,"請開啟儲存許可權",Toast.LENGTH_SHORT).show();
//                    return;
//                }
                imageUri = activity.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            }
        }
        // 開啟一個帶有返回值的Activity，請求碼為PHOTO_REQUEST_CAREMA
        activity.startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
    }

    /*
* 判斷sdcard是否被掛載
*/
    public static boolean hasSdcard() {
        return Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED);
    }
}
 

呼叫方法：

photoActivity.openCamera(this);

記得新增讀寫許可權和註冊activity。