android 6.0动态权限的封装写法

1 :先写一个ClassL类 BaseActivity,继承 AppCompatActivity ,然后在这个类里写权限相关的方法，如下所示：

public class BaseActivity extends AppCompatActivity {

    /**
     * 申请指定的权限.
     */
    public void requestPermission(int code, String... permissions) {

        ActivityCompat.requestPermissions(this, permissions, code);
    }

    /**
     * 判断是否有指定的权限
     */
    public boolean hasPermission(String... permissions) {

        for (String permisson : permissions) {
            if (ContextCompat.checkSelfPermission(this, permisson)
                    != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case Constan.WRITE_READ_EXTERNAL_CODE:
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    doSDCardPermission();
                }
                break;

         case Constan.HARDWEAR_CAMERA_CODE:
              if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                 doOpenCamera();
    }
    break;

 }    }    //处理整个应用中SD卡业务权限    public void doSDCardPermission() {    }

//处理整个fragment关于Camera的权限的业务逻辑
public void doOpenCamera() {


         }



 }

2 : 写一个常量类，，用于存放权限和权限的code ，如下所示

public class Constan {

   //sd卡的
    public static final int WRITE_READ_EXTERNAL_CODE = 0x01;
    public static final String[] WRITE_READ_EXTERNAL_PERMISSION = new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.READ_EXTERNAL_STORAGE};

   //照相机的
    public static final int HARDWEAR_CAMERA_CODE = 0x02;
    public static final String[] HARDWEAR_CAMERA_PERMISSION = new String[]{Manifest.permission.CAMERA};

 }

3：在其他activity中的使用 ，首先其他的activity需要继承这个BaseActivity，如下所示

public class MainActivity extends BaseActivity implementsView.OnClickListener{


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

    }

    private void initView() {
        btn01 = (Button) findViewById(R.id.printersetting_main_btn);
        btnSelect = (Button) findViewById(R.id.select_main_btn);
        //这个是悬浮在屏幕上的打印按钮
        printButton = (FloatingActionButton)findViewById(R.id.printBtn);

        btn01.setOnClickListener(this);
        btnSelect.setOnClickListener(this);
        printButton.setOnClickListener(this);

        mediaSize5x7 = new PrintAttributes.MediaSize("na_5x7_5x7in", "5 x 7", 5000, 7000);
        PrintUtil.doNotEncryptDeviceId = true;//属于唯一设备ID  不加密

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.printersetting_main_btn://设置按钮

                break;
            case R.id.select_main_btn://选择文件的按钮
            //在这里判断权限是否存在
                boolean b = hasPermission(Constan.WRITE_READ_EXTERNAL_PERMISSION);
                if (!b) {
                    requestPermission(Constan.WRITE_READ_EXTERNAL_CODE, Constan.WRITE_READ_EXTERNAL_PERMISSION);
                } else {
                    openAlbum();
                }

                break;
            case R.id.printBtn://悬浮按钮

              
                break;

        }

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        switch (requestCode) {

            case CHOOSE_PHOTO:
                if (resultCode == RESULT_OK) {
                    if (Build.VERSION.SDK_INT >= 19) {
                        userUri=handleImageOnKitKat(data);
                    } else {
                        userUri=handleImageBeforeKitKat(data);
                    }
                }

                break;
        }
    }


    //通过uri得到文件的类型，，主要用来判断的文件是图片还是PDF
    private String getMimeType(Uri uri) {
        Uri returnUri = uri;
        return   getContentResolver().getType(returnUri);
    }

    //这个类的作用主要是为了展示选择的图片或者PDF 的名称和大小
    private void showFileInfo(Uri uri) {
        Cursor returnCursor = getContentResolver().query(uri, null, null, null, null);

        int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
        int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
        returnCursor.moveToFirst();

        Toast.makeText(this,
                "File " + returnCursor.getString(nameIndex) + "(" + Long.toString(returnCursor.getLong(sizeIndex)) + ")",
                Toast.LENGTH_LONG).show();

    }

    //从相册中选择照片
    public static final int CHOOSE_PHOTO = 2;
    private void openAlbum() {
        //action_get_content是通过intent中设置的type属性来判断具体调用哪个程序的
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        startActivityForResult(intent, CHOOSE_PHOTO);
    }

    @TargetApi(19)
    private String  handleImageOnKitKat(Intent data) {
        String imagePath = null;
        Uri uri = data.getData();
        Log.d(TAG, "handleImageOnKitKat:获取的 uri=data.getData()  "+uri);
        if (DocumentsContract.isDocumentUri(this, uri)) {
            //如果是document 类型的Uri ,则通过document_id 来处理
            String docId = DocumentsContract.getDocumentId(uri);
            if ("com.android.providers.media.documents".equals(uri.getAuthority())) {
                String id = docId.split(":")[1];//解析出数据格式的ID

                String selection = MediaStore.Images.Media._ID + "=" + id;
                imagePath = getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);
                Log.d(TAG, "com.android.providers.media.documents: ");
            } else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(docId));
                imagePath = getImagePath(contentUri, null);
                Log.d(TAG, "com.android.providers.downloads.documents: ");
            }
        } else if ("content".equalsIgnoreCase(uri.getScheme())) {
            //如果是普通类型的Uri,则使用普通的方式来处理
            imagePath = getImagePath(uri, null);
//            imagePath = getRealPathFromURI(uri);
            Log.d(TAG, "content: ");
        } else if ("file".equalsIgnoreCase(uri.getScheme())) {
            //如果是file类型的uri，直接获取图片路径就可以了
            imagePath = uri.getPath();
            Log.d(TAG, "file ");
        }
        Log.d(TAG, "handleImageOnKitKat:1 图片真实路径imagePath " + imagePath);
        return imagePath;
    }

    //android 4.4一下就直接调用这个方法就可以了
    private String handleImageBeforeKitKat(Intent data) {
        Uri uri = data.getData();
        String imagePath = getImagePath(uri, null);
        Log.d(TAG, "handleImageBeforeKitKat:2 图片真实路径imagePath " + imagePath);
        return imagePath;
    }


    //根据uri获取路径
    private String getImagePath(Uri uri, String selection) {
        String path = null;
        //通过Uri 和selection来获取真实的图片路径
        Cursor cursor = getContentResolver().query(uri, null, selection, null, null);
        if (cursor != null) {
            if (cursor.moveToFirst()) {
                path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
            }
            cursor.close();
        }
        return path;
    }

    private String getRealPathFromURI( Uri contentUri) {
        Cursor cursor = null;
        try {
            String[] proj = { MediaStore.Images.Media.DATA };
            cursor = getContentResolver().query(contentUri,  proj, null, null, null);
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            String path = cursor.getString(column_index);

            return path;
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
    }



    //重新写这个方法
    @Override
    public void doSDCardPermission() {
        super.doSDCardPermission();
          openAlbum();

    }


}