Android判断某个权限是否开启的方法

/** * 读写权限 自己可以添加需要判断的权限 */public static String[]permissionsREAD={    Manifest.permission.READ_EXTERNAL_STORAGE,    Manifest.permission.WRITE_EXTERNAL_STORAGE };

/** * 判断权限集合 * permissions 权限数组 * return true-表示没有改权限 false-表示权限已开启 */public static boolean lacksPermissions(Context mContexts,permissionsREAD) {  for (String permission : permissions) {    if (lacksPermission(mContexts,permission)) {      return true;    }  }  return false;}/** * 判断是否缺少权限 */private static boolean lacksPermission(Context mContexts, String permission) {  return ContextCompat.checkSelfPermission(mContexts, permission) ==      PackageManager.PERMISSION_DENIED;}

if (lacksPermissions()){//读写权限没开启  ActivityCompat.requestPermissions(this,permissionsREAD,0);}else {  //读写权限已开启}

@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {  super.onRequestPermissionsResult(requestCode, permissions, grantResults);  if (requestCode==0){    for (int i = 0; i < permissions.length; i++) {      if (grantResults[i]!=-1){        //T.showShort(mContext,"权限设置成功");              }else {        //T.showShort(mContext,"拒绝权限");        // 权限被拒绝，弹出dialog 提示去开启权限        showPermissions();        break;      }    }  }}

//弹出dialog

private void showPermissions(){  final Dialog dialog=new android.app.AlertDialog.Builder(mContext).create();  View v=LayoutInflater.from(mContext).inflate(R.layout.dialog_permissions,null);  dialog.show();  dialog.setContentView(v);  Button btn_add= (Button) v.findViewById(R.id.btn_add);  Button btn_diss= (Button) v.findViewById(R.id.btn_diss);  btn_add.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View view) {      dialog.dismiss();      Intent intent = new Intent();      intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);      intent.addCategory(Intent.CATEGORY_DEFAULT);      intent.setData(Uri.parse("package:" + getPackageName()));      intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);      intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);      intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);      startActivity(intent);    }  });  btn_diss.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View view) {      dialog.dismiss();    }  });}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="250dp"  android:layout_height="wrap_content"  android:layout_gravity="center"  android:background="@color/white"  android:orientation="vertical" >  <TextView    android:id="@+id/tv_title"    android:layout_width="match_parent"    android:layout_height="40dp"    android:layout_gravity="center_vertical"    android:gravity="center"    android:text="提示"    android:background="@color/zhuti_color"    android:textColor="@color/white"    android:textSize="16sp" />  <TextView    android:id="@+id/tv_hint"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:textColor="@color/zhuti_color"    android:layout_marginRight="10dp"    android:layout_marginLeft="10dp"    android:layout_marginTop="10dp"    android:textSize="16sp"    android:gravity="center"    android:lineSpacingExtra="3dp"    android:text="需要手动开启权限才能使用"/>  <TextView    android:id="@+id/tv_hint2"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:textColor="@color/zhuti_color"    android:layout_margin="10dp"    android:textSize="12sp"    android:gravity="center"    android:visibility="gone"    android:lineSpacingExtra="3dp"    android:text=""/>  <LinearLayout    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_margin="15dp"    android:gravity="center"    android:orientation="horizontal">    <Button      android:id="@+id/btn_diss"      android:layout_width="0dp"      android:layout_weight="1"      android:layout_height="30dp"      android:background="@color/line2"      android:text="取消"      />    <Button      android:id="@+id/btn_add"      android:layout_width="0dp"      android:layout_weight="1"      android:layout_height="30dp"      android:layout_gravity="center"      android:background="@color/zhuti_color"      android:text="去设置"      android:layout_marginLeft="20dp"      android:textColor="@color/white" />  </LinearLayout></LinearLayout>