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android请求权限

2020年07月08日  | 移动技术网IT编程  | 我要评论

一个获取权限的Activity

import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import java.util.ArrayList;
import java.util.List;


public class MPermissionsActivity extends AppCompatActivity {
    private final String TAG = "MPermissions";
    private int REQUEST_CODE_PERMISSION = 0x00099;

    /**
     * 请求权限
     *
     * @param permissions 请求的权限
     * @param requestCode 请求权限的请求码
     */
    public void requestPermission(String[] permissions, int requestCode) {
        this.REQUEST_CODE_PERMISSION = requestCode;
        if (checkPermissions(permissions)) {
            permissionSuccess(REQUEST_CODE_PERMISSION);
        } else {
            List<String> needPermissions = getDeniedPermissions(permissions);
            ActivityCompat.requestPermissions(this, needPermissions.toArray(new String[needPermissions.size()]), REQUEST_CODE_PERMISSION);
        }
    }

    /**
     * 检测所有的权限是否都已授权
     *
     * @param permissions
     * @return
     */
    private boolean checkPermissions(String[] permissions) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            return true;
        }

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

    /**
     * 获取权限集中需要申请权限的列表
     *
     * @param permissions
     * @return
     */
    private List<String> getDeniedPermissions(String[] permissions) {
        List<String> needRequestPermissionList = new ArrayList<>();
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(this, permission) !=
                    PackageManager.PERMISSION_GRANTED ||
                    ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
                needRequestPermissionList.add(permission);
            }
        }
        return needRequestPermissionList;
    }


    /**
     * 系统请求权限回调
     *
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == REQUEST_CODE_PERMISSION) {
            if (verifyPermissions(grantResults)) {
                permissionSuccess(REQUEST_CODE_PERMISSION);
            } else {
                permissionFail(REQUEST_CODE_PERMISSION);
                showTipsDialog();
            }
        }
    }

    /**
     * 确认所有的权限是否都已授权
     *
     * @param grantResults
     * @return
     */
    private boolean verifyPermissions(int[] grantResults) {
        for (int grantResult : grantResults) {
            if (grantResult != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

    /**
     * 显示提示对话框
     */
    private void showTipsDialog() {
        new AlertDialog.Builder(this)
                .setTitle("提示信息")
                .setMessage("当前应用缺少必要权限，该功能暂时无法使用。如若需要，请单击【确定】按钮前往设置中心进行权限授权。")
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                })
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        startAppSettings();
                    }
                }).show();
    }

    /**
     * 启动当前应用设置页面
     */
    private void startAppSettings() {
        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(Uri.parse("package:" + getPackageName()));
        startActivity(intent);
    }

    /**
     * 获取权限成功
     *
     * @param requestCode
     */
    public  void permissionSuccess(int requestCode) {
        Log.d(TAG, "获取权限成功=" + requestCode);

    }

    /**
     * 权限获取失败
     * @param requestCode
     */
    public void permissionFail(int requestCode) {
        Log.d(TAG, "获取权限失败=" + requestCode);
    }
}

使用方法：

1、继承上面的Activity
2、在你需要请求权限的地方调用
 requestPermission(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.CAMERA}, 0x0001);
3、实现回调函数

```java
/**
     * 权限成功回调函数
     *
     * @param requestCode
     */
    public void permissionSuccess(int requestCode) {
        super.permissionSuccess(requestCode);
        switch (requestCode) {
            case 0x0001:
                //to do sth
                break;
        }
    }

本文地址：https://blog.csdn.net/qq_42955378/article/details/107184698

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