Android6.0以下

  public static void installNewPackage(Context context, String path) {
    if (StringUtils.isNull(path)) {
        return;
    }
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.setDataAndType(Uri.fromFile(new File(path)), "application/vnd.android.package-archive");
    context.startActivity(intent);
}

Android6.0及以上

先要配置AndroidManifest.xml
1.Application節(jié)點添加如下代碼

<provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths" />
</provider>

2.在資源文件夾res下新建xml目錄，新建provider_paths.xml文件，文件內(nèi)容如下

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

3.調(diào)用代碼

private static void openFile(File var0, Context var1) {
    Intent var2 = new Intent();
    var2.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    var2.setAction(Intent.ACTION_VIEW);
    Uri uriForFile = FileProvider.getUriForFile(var1, var1.getApplicationContext().getPackageName() + ".provider", var0);
    var2.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    var2.setDataAndType(uriForFile, var1.getContentResolver().getType(uriForFile));
    try {
        var1.startActivity(var2);
    } catch (Exception var5) {
        var5.printStackTrace();
        Toast.makeText(var1, "沒有找到打開此類文件的程序", Toast.LENGTH_SHORT).show();
    }
}