android 使用fileprovide 安装apk文件

因 android 7.0的权限修改，原先的安装apk的方法不能用，会报 android.os.FileUriExposedException 异常

public void installApk(File file) {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(file),"application/vnd.android.package-archive");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }

　　

使用fileprovider可以解决这个问题。

androidManifest.xml 

<provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="包名.fileProvider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>

在res文件夹下创建 xml 文件夹，在xml下创建 file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <!--根目录-->
    <external-path name="my_path" path="/"/>
</paths>

<files-path name="name" path="image" /> = Context.getFileDir() : /data/data/com.xxx.app/files/image


<cache-path name="name" path="image" /> = Context.getCacheDir() : /data/data/com.xxx.app/cache/image


<external-path name="name" path="image" /> = Environment.getExternalStorageDirectory() : /storage/emulated/image 如果想为根目录 则把path = "/" 即可


<external-files-path name="name" path="image" /> = Context.getExternalFilesDir(String) / Context.getExternalFilesDir(null) : /storage/emulated/0/Android/data/com.xxx.app/files/image

跳转到安装App的界面，兼容8.0

/**
     * 安装apk
     * @param fileUri apk文件的路径
     */
    fun openAPKFile(fileUri: String?) {

        if (null != fileUri) {
            try {
                val intent = Intent(Intent.ACTION_VIEW)
                val apkFile = File(fileUri)
                //7.0
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    intent.flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
                    val contentUri = FileProvider.getUriForFile(this, "$packageName.fileProvider", apkFile)
                    intent.setDataAndType(contentUri, "application/vnd.android.package-archive")
                    //8.0
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                        val hasInstallPermission = packageManager.canRequestPackageInstalls()
                        if (!hasInstallPermission) {
//                            提示语
                            startInstallPermissionSettingActivity()
                            return
                        }
                    }
                } else {
                    intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive")
                    intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
                }
                if (packageManager.queryIntentActivities(intent, 0).size > 0) {
                    startActivity(intent)
                }
            } catch (e: Throwable) {
                e.printStackTrace()
            }

        }
    }


    /**
     * 跳转到  设置-允许安装未知来源
     */
    @RequiresApi(api = Build.VERSION_CODES.O)
    private fun startInstallPermissionSettingActivity() {
        //8.0新API
        val intent = Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES)
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
        startActivity(intent)
    }