Android申请相机权限和读写权限实例

<uses-permission android:name="android.permission.camera"/>
<uses-permission android:name="android.permission.read_external_storage"/>
<uses-permission android:name="android.permission.write_external_storage"/>

public class permission {
    public static final int request_code = 5;
    //定义三个权限
    private static final string[] permission = new string[]{
            manifest.permission.camera,
            manifest.permission.read_external_storage,
            manifest.permission.write_external_storage,
    };
    //每个权限是否已授
    public static boolean ispermissiongranted(activity activity){
        if(build.version.sdk_int >= 23){
            for(int i = 0; i < permission.length;i++) {  
                int checkpermission = contextcompat.checkselfpermission(activity,permission[i]);
                /***
                 * checkpermission返回两个值
                 * 有权限: packagemanager.permission_granted
                 * 无权限: packagemanager.permission_denied
                 */
                if(checkpermission != packagemanager.permission_granted){
                    return false;
                }
            }
            return true;
        }else{
            return true;
        }
    }

    public static boolean checkpermission(activity activity){
        if(ispermissiongranted(activity)) {
            return true;
        } else {
            //如果没有设置过权限许可，则弹出系统的授权窗口
            activitycompat.requestpermissions(activity,permission,request_code);
            return false;
        }
    }
}

@override
    protected void onstart() {
        super.onstart();
        permission.checkpermission(this);
    }

    @override
    protected void onresume() {
        super.onresume();
        if(permission.ispermissiongranted(this)) {
            log.i("permission","请求权限成功");
        }
    }

    @override
    public void onrequestpermissionsresult(
            int requestcode, @nonnull string[] permissions, @nonnull int[] grantresults) {
        super.onrequestpermissionsresult(requestcode, permissions, grantresults);
        if (requestcode == permission.request_code) {
            for (int grantresult : grantresults) {
                if (grantresult != packagemanager.permission_granted) {
                    log.e("permission","授权失败！");
                    // 授权失败，退出应用
                    this.finish();
                    return;
                }
            }
        }
    }