android程序启动即开启动态权限

android，尽管我们在AndroidManifest里面申请了权限加载，但是在使用过称中，发现这些权限还是没有，什么原因呢？因为android在6.0版本以后，我们需要动态加载它，今天带领小伙伴们看看怎么在android6.0程序的入口处写动态加载权限吧。首先我们定义一个Avtivity作为程序的第一个入口WelcomeActivity：定义一个权限数组：String[] permissions = new String[]{      android.Manifest.permission.ACCESS_COARSE_LOCATION,        android.Manifest.permission.ACCESS_FINE_LOCATION,      android.Manifest.permission.WRITE_EXTERNAL_STORAGE,      android.Manifest.permission.ACCESS_LOCATION_EXTRA_COMMANDS,        android.Manifest.permission.BLUETOOTH,        android.Manifest.permission.BLUETOOTH_ADMIN,        android.Manifest.permission.BLUETOOTH_PRIVILEGED,}; List mPermissionList = new ArrayList<>();boolean mShowRequestPermission = true;//用户是否禁止权限 然后写一个方法checkPermision()检查程序是否已开启本权限   private void checkPermision() {    mPermissionList.clear();    for (int i = 0; i < permissions.length; i++) {      if (ContextCompat.checkSelfPermission(WelcomeActivity.this, permissions[i]) != PackageManager.PERMISSION_GRANTED) {            mPermissionList.add(permissions[i]);        }    }     /**             * 判断是否为空             */         if (mPermissionList.isEmpty()) {//未授予的权限为空，表示都授予      了        initLoading();    } else {//请求权限方法        String[] permissions = mPermissionList.toArray(new String[mPermissionList.size()]);//将List转为数组        ActivityCompat.requestPermissions(WelcomeActivity.this, permissions, 1);    }    }    //开启线程跳转 private void initLoading() {    StatusBarUtil.setTransparent(WelcomeActivity.this);    tv = (TextView) findViewById(R.id.textView1);    mc = new MyCountDownTimer(3000, 1000);    mc.start();    handler.postDelayed(new Runnable() {        @Override        public void run() {            Intent intent = new Intent(WelcomeActivity.this, LoginsActivity.class);            startActivity(intent);            finish();        }    }, 3000);}private Handler handler = new Handler();class MyCountDownTimer extends CountDownTimer {    public MyCountDownTimer(long millisInFuture, long countDownInterval) {        super(millisInFuture, countDownInterval);    }    public void onFinish() {        tv.setText("正在跳转");    }    public void onTick(long millisUntilFinished) {        tv.setText("倒计时(" + millisUntilFinished / 1000 + ")");    }}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {    super.onRequestPermissionsResult(requestCode, permissions, grantResults);    switch (requestCode) {        case 1:            for (int i = 0; i < grantResults.length; i++) {                if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {                    //判断是否勾选禁止后不再询问                    boolean showRequestPermission = ActivityCompat.shouldShowRequestPermissionRationale(WelcomeActivity.this, permissions[i]);                    if (showRequestPermission) {//                        checkPermision();//重新申请权限                        return;                    } else {                        mShowRequestPermission = false;//已经禁止                    }                }            }            initLoading();            break;        default:            break;    }}
}
看下效果图吧：第二个完成了就跳转界面了：
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