Android之动态权限工具类

分享权限工具类 GetAndRequestPermission 

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.util.Log;
import androidx.core.app.ActivityCompat;
import java.util.ArrayList;
import java.util.List;

public class GetAndRequestPermission {
    public static GetAndRequestPermission getAndRequestPermission;
    private Activity mAvtivity;
    private static final int REQUEST_CRITICAL_PERMISSIONS = 10;
    //用户所有权限
    private static String[] CRITICAL_PERMISSION_ARRAY = null;
    public static GetAndRequestPermission getInstance() {
        if (getAndRequestPermission == null) {
            getAndRequestPermission = new GetAndRequestPermission();
        }
        return getAndRequestPermission;
    }

    public void requestPermissions(Activity mAvtivity){
        this.mAvtivity = mAvtivity;
        getPermisson(mAvtivity);
    }

    //获取权限
    @TargetApi(Build.VERSION_CODES.M)
    private void getPermisson(Context context) {
        try {
            PackageManager pm = context.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 0);
            //得到自己的包名
            String pkgName = pi.packageName;

            PackageInfo pkgInfo = pm.getPackageInfo(pkgName, PackageManager.GET_PERMISSIONS);
            String sharedPkgList[] = pkgInfo.requestedPermissions;
            List<String> permissionLst = new ArrayList();
            if (sharedPkgList.length > 0)
                for (int i = 0; i < sharedPkgList.length; i++) {
                    String permName = sharedPkgList[i];
                    //判断是否有这个权限
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&mAvtivity.checkSelfPermission(permName)
                            != PackageManager.PERMISSION_GRANTED) {
                        permissionLst.add(permName);
                    }
                }

            if (permissionLst.size() > 0) {
                CRITICAL_PERMISSION_ARRAY = new String[permissionLst.size()];
                for (int i = 0; i < permissionLst.size(); i++) {
                    CRITICAL_PERMISSION_ARRAY[i] = permissionLst.get(i);
                }
            }

            if (CRITICAL_PERMISSION_ARRAY != null && CRITICAL_PERMISSION_ARRAY.length > 0) {
                requestPermission();
            }
        } catch (Exception e) {
            Log.e("##ddd", "Could'nt retrieve permissions for package");
        }
    }


    public void requestPermission() {
        ActivityCompat.requestPermissions(
                mAvtivity,
                CRITICAL_PERMISSION_ARRAY,
                REQUEST_CRITICAL_PERMISSIONS
        );
    }
}

调用：

GetAndRequestPermission.getInstance().requestPermissions(this);//动态申请权限

                                                                                                                                                                        -END