先上代码，代码兼容7.0

/**

* 安装apk

*/

private void installApk() {

Intent intent = new Intent(Intent.ACTION_VIEW);

intent.addCategory(Intent.CATEGORY_DEFAULT);

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

String type = "application/vnd.android.package-archive";

Uri uri;

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {

uri = FileProvider.getUriForFile(activity, activity.getPackageName() + ".fileProvider", newApkFile);

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

} else {

uri = Uri.fromFile(newApkFile);

}

intent.setDataAndType(uri, type);

activity.startActivity(intent);

}

对于需要兼容7.0需要在在AndroidManifest中添加provider

...>

android:name="android.support.v4.content.FileProvider"

android:authorities="${applicationId}.fileProvider"

android:exported="false"

android:grantUriPermissions="true">

android:name="android.support.FILE_PROVIDER_PATHS"

android:resource="@xml/file_paths"/>

上段代码中的file_paths是定义在res下的xml文件夹中的文件

其中external-path节点表示Environment.getExternalStorageDirectory()路径

path表示apk文件在Environment.getExternalStorageDirectory()路径下的文件夹名称

最后如果需要兼容8.0手机需要添加权限

附上两个方法

获取当前版本号

try {

PackageManager manager = activity.getPackageManager();

PackageInfo info = manager.getPackageInfo(activity.getPackageName(), 0);

versionCode = info.versionCode;

} catch (PackageManager.NameNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

获取apk文件版本号

private int getVersionCodeFromApk(String path) {

PackageManager pm = activity.getPackageManager();

PackageInfo packInfo = pm.getPackageArchiveInfo(path, PackageManager.GET_ACTIVITIES);

int versionCode;

try {

versionCode = packInfo.versionCode;

} catch (Exception e) {

versionCode = 0;

}

return versionCode;

}