ionic 在Android8.0以上会出现相机打不开，下载apk打不开的情况，为了解决以上问题，具体方案如下

1 插件  cordova-plugin-android-permissions  1.0.0

安装插件  cordova pluign add cordova-plugin-android-permissions

2 相关的拍照权限

```

function checkPermissions() {

const permissions = cordova.plugins.permissions,

permissionList = [permissions.CAMERA,

permissions.WRITE_EXTERNAL_STORAGE,

permissions.INSTALL_LOCATION_PROVIDER];

function errorCallbacks() {

console.warn("permissions is not turned on");

}

function checkPermissionCallbacks(status) {

if(!status.hasPermission) {

permissions.requestPermissions(

permissionList,

status => {

if(!status.hasPermission) errorCallbacks();

},

errorCallbacks);

}

}

permissions.hasPermission(permissionList, checkPermissionCallbacks, null);

}

checkPermissions()

```

3 相关apk下载权限

```

function userDate(url, targetPath){

var permissions = cordova.plugins.permissions;

permissions.hasPermission(permissions.READ_EXTERNAL_STORAGE,checkPermissionCallback, null);

function checkPermissionCallback(status) {

if (!status.hasPermission) {

var errorCallback = function(){

console.log('Storagepermission is not turned on');

}

permissions.requestPermission(

permissions.READ_EXTERNAL_STORAGE,

function(status) {

if(!status.hasPermission) {

errorCallback();

} else {

// download_app();

download_app(url,targetPath)

}

},

errorCallback);

}else{

download_app(url, targetPath)

}

}

}

```

注：bug

a.安装插件之后，对应的ionic1版本的话，安装之后会造成不能打包，需要在安装插件时 file插件对应版本号安装，添加Android平台时需要cordova platform add android@6.3.0,

此时需要查看平台是否添加完整。

b.为了解决权限问题，添加权限之后需要在AndroidMifeat

固定版本号

权限查看

```

```

c.如果build时遇到transform…错  在Android平台下build.gradle

configurations.all {

resolutionStrategy {

force 'com.android.support:support-v4:27.1.0'

}

}

def promptForReleaseKeyPassword()之前添加