Android6.0以上系统动态获取权限

动态权限的申请方法：

1、首先，需要在AndroidManifest.xml静态申请权限，否则无法动态申请权限： 

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

2.动态申请

public boolean checkSelfPermission(String permission, int requestCode) {
        Log.i(LOG_TAG, "checkSelfPermission " + permission + " " + requestCode);
        if (ContextCompat.checkSelfPermission(this,permission)!= PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,REQUESTED_PERMISSIONS,requestCode);
            return false;
        }
        return true;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String permissions[], @NonNull int[] grantResults) {
        Log.i(LOG_TAG, "onRequestPermissionsResult " + grantResults[0] + " " + requestCode);

        switch (requestCode) {
            case PERMISSION_REQ_ID: {
                if (grantResults[0] != PackageManager.PERMISSION_GRANTED || grantResults[1] != PackageManager.PERMISSION_GRANTED || grantResults[2] != PackageManager.PERMISSION_GRANTED) {
                    showLongToast("Need permissions " + Manifest.permission.RECORD_AUDIO + "/" + Manifest.permission.CAMERA + "/" + Manifest.permission.WRITE_EXTERNAL_STORAGE);
                    finish();
                    break;
                }

                //initAgoraEngineAndJoinChannel();//获取权限后要执行的代码
                break;
            }
        }
    }

    public final void showLongToast(final String msg) {
        this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
            }
        });
    }

在这里onCreate中调用checkSelfPermission方法

　　private static final int PERMISSION_REQ_ID = 22;

    // permission WRITE_EXTERNAL_STORAGE is not mandatory for Agora RTC SDK, just incase if you wanna save logs to external sdcard
    private static final String[] REQUESTED_PERMISSIONS = {Manifest.permission.RECORD_AUDIO, Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE};
...

　　if (checkSelfPermission(REQUESTED_PERMISSIONS[0], PERMISSION_REQ_ID) &&
                checkSelfPermission(REQUESTED_PERMISSIONS[1], PERMISSION_REQ_ID) &&
                checkSelfPermission(REQUESTED_PERMISSIONS[2], PERMISSION_REQ_ID)) {
            initAgoraEngineAndJoinChannel();//申请权限成功后执行的代码
        }